CERN
LHC Project Document No.
LHC-LJ-EC-
CH-1211 Geneva 23
Switzerland
EDMS Document No.
the
Engineering Change requested by ( Name & Div./Grp. ) :
Large
Hadron
Collider
A. L. Perrot / EN-MEF, R2E Project
project
Date: 3/12/2016
The 2Figures
…a n
Engineering Change
Request
– Class I
Protection of equipment located in UJ56
Brief description of the proposed change(s) :
The level of radiation expected from the collisions at the interaction point 5, and more
precisely the flux of hadrons with energy in the multi MeV range, will induce Single
Event Errors of the standard electronics present in many of the control equipment
located in UJ56. Such events would perturb the LHC, possibly leading to critical
situations for the machine elements. It is furthermore proposed to relocate part of the
equipment installed in UJ56 (almost all first floor racks) into the UL557 bypass gallery,
where the amount of radiation is reduced. The relocation of the SEE sensitive
equipment identified by the RADWG is foreseen for the first LHC long shutdown. This
ECR documents this implementation.
Equipment concerned :
Drawings concerned :
Equipment installed in
UJ56
Documents concerned :
Reference Database
PE in charge of the item :
PE in charge of parent item in PBS :
M. Brugger / A. L. Perrot
Samy Chemli
Decision of the Project Engineer :
Decision of the PLO for Class I changes :
 Rejected.
 Accepted by Project Engineer,
no impact on other items.
Actions identified by Project Engineer
 Accepted by Project Engineer,
 Not requested.
 Rejected.
 Accepted by the Project Leader Office.
Actions identified by Project Leader Office
but impact on other items.
Comments from other Project Engineers required
Final decision & actions by Project Management
Date of Approval :
Date of Approval :
Actions to be undertaken :
Date of Completion :
Visa of QA Officer :
Note : when approved, an Engineering Change Request becomes an Engineering Change Order/Notification.
LHC Project Document No.
LHC-LJ-ECPage 2 of 20
1. DETAILED DESCRIPTION
by A. L. Perrot
The level of radiation expected from the collisions at the interaction point 5 has been
simulated with the FLUKA code [1, 2] for the LHC design values. Critical radiation levels
are found in the UJ56. Therefore, for 2011/2012, hadrons with E>20 MeV fluence
between 3.5x107 and 1.1x108 cm-2 per year was predicted on average at relevant
critical equipment locations in UJ56. This fluence will reach up to 5.3x108 cm-2 per year
and 2.1x109 cm-2 per year, respectively, at LHC nominal and ultimate conditions. For
comparison, at CNGS, before additional shielding implementation, SEE failures (leading
to the stop of the facility) were observed for hadrons with E>20 MeV fluences of the
order of 107 cm-2 per year.
The relocation actions to be performed to reduce the SEE in the UJ56 electronics have
been divided into 3 phases. The first two phases were performed during the 2010-2011
and the 2011-2012 Christmas breaks while the third and major phase is foreseen
during the first long shutdown. The first phase consisted into moving the critical safety
elements (ODH and fire detection central units) [3]. The second phase consisted into
relocating the UPS units. The third phase will consist into relocating and protecting the
remaining SEE sensitive equipment identified by the RADWG [4].
This document describes the second and third phases of the strategy proposed by the
R2E Mitigation Project in terms of relocation to minimise radiation induced failures in
electronics located in UJ56.
1.1 IRRADIATION TESTS RESULTS OF THE EQUIPMENT TO BE RELOCATED
by M. Brugger and G. Spiezia
The equipment installed in the UJ56 mostly consists of commercial electronics not
specifically designed nor tested to be operated in a radiation environment. For example,
previous test results on PLCs, Ethernet repeaters, QPS control, etc., as well as 2011
LHC operation have shown that the radiation tolerance of the existing equipment cannot
be guaranteed and that LHC operation would be significantly impacted in case no
mitigation measures are applied. In order to further evaluate the radiation sensitivity of
the equipment exposed to the above mentioned radiation levels, some of the most
affected devices/systems located in the UJ56 have been submitted to irradiation tests
at the CNRAD test area [4]. During these tests not all UJ56 equipment could be tested
(due to beam time limitation, complexity/size of the equipment to be tested) and it is
furthermore important to note that testing commercial equipment/components does not
guarantee that a similar type of equipment would lead to the same failure crosssections. This is due to the number of used components, possible different producers
and component batches, where no control can be performed from the user side nor
guarantee be given from the manufacturer. For the case of the power-converters,
additional tests of full power-converter units were performed in a new R2E test-area,
H4IRRAD [5]. This allowed for both, confirm the 2010/2011 LHC observation and study
intermediate patch-solutions in order to minimize the impact during 2012 operation.
Consistent with observations during LHC operation, the performed radiation tests
confirmed clearly that various systems show soft failures (requiring reset) already at
relatively low radiation levels of the order of 1x107 cm-2 (PLC control systems) and
destructive failures (power-supplies) as from a few 1x108 cm-2 accumulated highenergy hadron fluence onwards. Even though some of the tested components showed a
higher resistance during the radiation tests, it was decided between the equipment
owners, the RadWG and the R2E mitigation project to relocate all concerned systems:
 where failures under radiation tests where observed;
 where the equipment type is known to be radiation sensitive (e.g. complex
control or powering systems);
LHC Project Document No.
LHC-LJ-ECPage 3 of 20

where the relocation of other sensitive equipment makes it more efficient for the
equipment to be relocated with (cabling/access/maintenance).
The equipment remaining in critical areas exposed to radiation is thus only equipment
which was tested under radiation (e.g. designed similarly for the LHC tunnel) or passive
equipment not or less prone to SEE induced errors.
1.2 EQUIPMENT TO BE RELOCATED AND ASSOCIATED MODIFICATIONS
by A. L. Perrot
For complete information about the equipment and the reason inducing its relocation,
please refer to the ‘Point 5 - equipment inventory document [3]. The current locations of
the equipments to be relocated are presented in Figures 1 to 4 while their locations after
relocation are presented in Figures 5 to 7. Relocating the equipment will not have any
impact on the machine functionality.
1.2.1 POWER CONVERTERS EQUIPMENT
This equipment is located in the UJ56 –level 1 and consists of 15 power converters used
for the powering of the Inner Triplet (IT) quadrupoles circuits of Point 5 right and their
correctors (see Table 1). The misbehaviour / failure of one of these devices will lead to
the beam dump and possible access for reparation. All the equipment will be relocated
in UL557 as close as possible to UJ56/UP56 (see Figure 6). Two amongst the four spare
racks (RYSAxxx) will be relocated further away on the other side of the bypass. The two
remaining spare racks today located in UJ56 will be removed. Two spare racks are
already located in USC55 machine area. The integration of the power converters in the
bypass takes into account the volume required for their installation (with connection)
and their maintenance (1.4 m in front of the equipment to remove the power supply
modules). The 2 calibration racks (RYCA01-02) have to be accessible from both sides
and stay together. The only integration solution for these both racks leads to their
partial interference with the transport volume. This implies their removal for the
passage of the transport (see paragraph 1.4). To minimise the length of the watercooled cables from DFBX several ducts will be drilled in the wall between the machine
and UJ56 and between UJ56 and UL557 bypass (see paragraph 1.3). In addition the
bypass sector door (YCPS01=UJ561) will be displaced 10 meters away in UL56. This will
allow relocating the power converters as close as possible to the cables arrival in the
bypass.
To ensure the functionality of the power converters in their new location the following
constraints will have to be filled:
- ensure the cooling of the equipment by chilled and demineralised water,
- provide new links to WorldFip and PIC equipment,
- provide Ethernet access in the bypass,
- redefine the length/section of the DC cables in view to avoid getting over the
maximum voltage delivered by the power converter (see paragraph 1.2.10),
- group together the IT Quadrupoles racks and ensure a common grounding (via a
common Copper plate installed below these racks).
LHC Project Document No.
LHC-LJ-ECPage 4 of 20
Table 1. Power converters
Rack Reference
RQX.R5
Converter/Rack Type
LHC8kA-08V
Power Converter Name
RPHFC.UJ56.RQX.R5
[RYPFB, RYPFA01, RKHF,
Circuit Name
‘RQX.R5’ (Cf LHC DataBase Layout)
IT quadrupoles
RYPFA02, RYHF01]
RTQX2.R5 [RYPFA03, RKHG
RYPFA04, RYHG01]
LHC6kA-08V
RPHGC.UJ56.RTQX2.R5
LHC600A-10V
RPMBC.UJ56.RTQX1.R5
RYMCC01
RYCA01
DCCT Calibration
RYCA02
DCCT - ADC Electronics
RYMCB02
LHC600A-10V
RYMCB03
LHC600A-10V
RYMCB04
LHC600A-10V
RYMCB05
LHC600A-10V
RYLB01
LHC120A-10V
RYLC01
LHC120A-10V
RYSA01
Spare Parts
RYSA02
Spare Parts
RYSA03
RYSA04
Spare Parts
Spare Parts
RYSC01
Hot Spare Parts
RPMBB.UJ56.RCBXH3.R5
RPMBB.UJ56.RCBXH2.R5
RPMBB.UJ56.RCBXV3.R5
RPMBB.UJ56.RCBXH1.R5
RPMBB.UJ56.RCBXV1.R5
RPMBB.UJ56.RCBXV2.R5
RPMBB.UJ56.RQSX3.R5
RPLB.UJ56.RCOX3.R5
RPLB.UJ56.RCOSX3.R5
RPLB.UJ56.RCSX3.R5
RPLB.UJ56.RCSSX3.R5
RPLB.UJ56.RCTX3.R5
RCBXH3.R5
RCBXH2.R5
RCBXV3.R5
RCBXH1.R5
RCBXV1.R5
RCBXV2.R5
RQSX3.R5
RCOX3.R5
RCOSX3.R5
RCSX3.R5
RCSSX3.R5
RCTX3.R5
1.2.2 SURVEY
The electronics of the low beta magnet monitoring and repositioning system is located
in three racks (GYPOS01-03) today installed in UJ56 level 1. The failure of the system
would prevent for further adjustment of the inner triplets. GYPOS01 hosts the sensor
data acquisition modules (SAS) for both triplets and electronics cards for temperature
measurements while GYPOS02-03 host the motor electronics for remote positioning
system of both triplets (one rack per triplet). The three racks will be relocated in
UL557 bypass taking into account the maximum length of 270 m for the cables
powering the motors and the sensors data acquisition.
One of the GGPSO reference positions located in UL557 bypass will be hidden by one
of the racks to be relocated in that area. To ensure the continuity between the
different survey reference points, the survey group will install new reference points in
UL557 bypass and in UL56.
1.2.3 ACCESS SYSTEM
The five racks YYACS01-05 located in UJ56 level 1 are dedicated to the access
system. Only one of them, the YYACS05 rack, contains sensitive electronics. It
ensures the control and the management of all the underground doors. Its failure
would lead to the misbehavior of the control of all the underground sector doors. This
rack will be relocated in USC55 level 2 machine area (see Figure 7).
1.2.4 CRYOGENICS PROFIBUS EQUIPMENT
Three racks QYC01-03 located in UJ56 level 1 are dedicated to the cryogenics
instrumentation. The QYC01 and 03 racks contain ‘profibus crates’ which are sensitive
to radiation field. A failure of these crates could severely degrade the cryogenic
operation requiring a beam dump to provide access for reparation. The 2 racks will be
relocated in UL557 bypass (see Figure 6).
LHC Project Document No.
LHC-LJ-ECPage 5 of 20
Figure 1: Point 5 general area layout.
Figure 2: Point 5 general area view UJ56- UL557 bypass.
Figure 3a: Equipment location in UJ56 – level 0 (in red equipment to be relocated).
LHC Project Document No.
LHC-LJ-ECPage 6 of 20
Figure 3b. Present location of the control cabinet UIA0-00560 in UJ56 – level 0.
Figure 4:. Equipment to be removed from UJ56 – level 1 (inside blue thick borders).
Figure 5: Overall view of UJ56-UJL557 bypass area after equipment relocation.
LHC Project Document No.
LHC-LJ-ECPage 7 of 20
Figure 6: UL557 bypass after equipment relocation.
Figure 7: USC55 machine area after equipment relocation.
1.2.5 QUENCH PROTECTION SYSTEM (QPS) AND ENERGY EXTRACTION
The racks DYPG01-02 located in UJ56 level 1 host the electronics dedicated to the
protection of the inner triplets and correctors. Their failures may lead to the
transmission of corrupted data, to the loss of communication and supervision of the
LHC Project Document No.
LHC-LJ-ECPage 8 of 20
QPS system. Even, if all the protection systems are fully redundant it has been
decided to relocate these 2 racks. The QPS systems cannot be moved to the surface
as their maximum distance to the corresponding DFB is restricted to about 100 m.
The 2 racks will thus be relocated in UL557 bypass taking into account these 100 m
(see Figure 6). With increasing length of the quench heater power cable from the
DQHDS heater power supplies to the DFBX a larger part of the available energy (2.9
KJ per supply) will be deposited in the cable. That means less energy will be deposited
in the triplet magnet heater. Calculations estimate that with the present configuration
33% of the energy is deposited in the cable and 67% in the magnet heaters. With the
new length of cables, 43% of the energy will go in the cable and thus only 57 % in
the magnet heaters. Taking these numbers into consideration the experts concluded
that the functionality of the system will be ensured with the 2 racks in their new
location.
1.2.6 FIRE AND ODH DETECTION EQUIPMENT
The relocation of this equipment has been treated in a dedicated ECR [4]. In view of
the amount of material that will be relocated in UL557 bypass, it has been decided to
install new fire detection pipe to protect UP56, TU56 and UJL557 bypass areas.
1.2.7 CONTROL EQUIPMENT



Collimators control: The racks TYCFL01 and TYCCR01 located in UJ56 level 1 are
dedicated to the control of the collimators. Their failure will lead to the
requirement of a beam dump. This control system is linked to the Beam Interlock
System (BIS), to the remote reset rack and to the LHC timing. The system can be
relocated up to 200 m from its present location due to cables length limitation for
sensor and stepper motor driver. The two racks will be relocated in USC55 in the
machine area (see Figure 7). The rack TYCFL01 will be renamed TYCFL02 while
the TYCCR01 crates will be merged inside the already existing TYCCR01 rack.
Power Interlock Controller (PIC): The complete protection system for the
inner triplet R5 and the two PLCs controlling the remote I/Os for the matching
section and the long arc cryostat (themselves installed in RR57) are currently
installed in the rack CYCIP01 in level 1 of UJ56. The main clients connected to the
system are the LHC quench protection system (QPS) and the power converters. In
addition the system receives interlock signals from the cryogenics, the UPS and
AUG and is sending beam dump requests to the Beam Interlock System (BIS).
Any failure in the magnet powering infrastructure or the interlock system itself will
lead to an interlock to the LHC power converters and for most circuits to a dump
of both particle beams. The PLCs can be separated from the remote I/Os through
a Profibus link up to ~ 1km, while the I/Os shall remain close to the QPS and
power converters to keep the local controls cabling reasonably short. All systems
currently installed in level 1 of UJ56 will be relocated into UL557 bypass, close to
the QPS racks (DYPG01/02) and the power converters powering the inner triplet
R5 (see Figure 6).
Beam Interlock Controller (BIS): one Beam Interlock Controller (BIC) is
located in the CYCIB01 rack in UJ56 level 1. The connected user systems are:
Vacuum, Collimation, PIC, FMCM and both CMS and TOTEM experiences. Each user
system delivers via a dedicated interface (CIBU) its own local permit for beam
operation. Any failure of the system will lead to a beam dump and will block
further beam operations. In addition to the BIC, the CYCIB01 rack contains
another machine interlock system: the ‘Fast Magnet current Change Monitor’
(FMCM) unit attached to the RD1.LR5 circuit. The full rack will be relocated in
USC55 machine area (see Figure 7). To ensure the functionality of the BIS in its
new location the following constraints will have to be filled:
- the extended cable length must stay below 1200 m,
LHC Project Document No.
LHC-LJ-ECPage 9 of 20





- the cables extension and optical fibers installations will have to be performed
with a very special care as these cables transmit the beams ‘user permit’. A non
high quality extension may lead to non requested beam dumps,
- Ethernet connections available in the rack;
- UPS network available in the rack.
Current lead heaters: The rack DYXF01 located in UJ56 level 1 contains the
control equipment of the current lead heaters providing the temperature
regulation of the top part of the current lead. Their failure will stop their heating
function and possibly lead to a non start of the power converters at the restarting
of the LHC machine. It has been decided to relocate the rack in USC55 machine
area (see Figure 7).
Timing and remote reset: there are two racks located in UJ56 level 1 hosting,
respectively, the timing (rack CYTIM01) and the remote reset (rack CYFRE01)
systems. Each system consists into a 3 units crate and manages the timing and
remote reset distribution for the front-end controls. A failure of the timing system
would induce a beam dump due to the lack of timing distribution for the
equipment related to the beam control. The two racks will be relocated in UL557
bypass where their user agents will be relocated (see Figure 6). The distance
between their present and future locations should be as short as possible.
Network: The racks CYNET01 and CYNET02 located in UJ56 level 1 are the
network star-points for UJ56. They provide the Technical Network (TN) and Global
Purpose Network (GPN) to the equipment installed in UJ56. Their failure will affect
all the users in the area. As a consequence it has been suggested to relocate
these two racks. It has been decided to merge them into one rack. The maximum
distance between the ‘star-point’ (i.e. the rack) and the Ethernet plugs installed all
around (i.e. the users) is 90 m. This drives the location at which the new rack
CYNET01 can be displaced. It will be installed in UL557 bypass where the major
part of the users will be relocated (see Figure 6).
Optical fibers: the rack CYFIB01 installed in UJ56 level 1 is the star-point for the
UJ56. It will not suffer from SEE as it consists of passive elements. However, new
racks CYFIB01 will have to be installed in UL557 bypass and UCS55 machine area
to ensure the dispatch towards the users that will be relocated in these areas.
WorldFip repeaters: Cryogenics and power converters are the only users of the
worldfip repeaters located in UJ56. The ten corresponding units are hosted in the
CYFRE01 rack in UJ56 level 1. A failure of one repeater unit implies that the
associated equipment cannot respond anymore. The four units dedicated to the
cryogenics are optical fibers /Cu type while the six units dedicated to power
converters are Cu/Cu type. Following the irradiation test results for both types of
repeaters it has been decided to relocate in UL557 bypass in the rack CYFRE01
only the worldfip repeaters units dedicated to cryogenics (see Figure 6).
1.2.8 ELECTRICAL EQUIPMENT

Uninterruptible Power Supply (UPS): there are two UPS systems (cabinets
EBS1/56, EBS11/56 and ESS12/56) located in UJ56 level 0. They power machine
equipment via the associated racks/switchboards installed in UJ56, USC55
(machine area) and RR53/57. The UPS modules are purchased as complete units.
They contain electronics to control voltage and current, and switches between
battery powered units and the main supply. The two UPS with their associated
distribution switchboards (EOD) may suffer from SEU. A failure of the UPS could
lead to a total loss of electrical power delivered to the users (see Table 2). In
particular it could lead to the loss of the vacuum system, the quench detection, the
radiofrequency equipment, the beam monitoring and the supervision system. It has
thus been decided to relocate the UPS modules in UL557 bypass (see Figure 6,
units EBS11/56, EJG11/56, EBS12/56, EJG12/56, EOD1/56, EOD3/56).
LHC Project Document No.
LHC-LJ-ECPage 10 of 20


Electrical services dedicated to the personal safety for Point 5: they are
installed in the safe room located in UJ56 level 0 (see Figure 3).
- General emergency stop ‘AUG’ system (EYU01 rack): its misbehaviour could
generate false safety alarms and power-off the electrical network. It will be
relocated in UL557 bypass in a ‘mini safe-room’.
- The Electrical Network Monitoring system (EYC01/02/03 racks): the three
racks host PLCs and industrial data acquisition units that are sensitive to SEE.
Their misbehaviour would corrupt the information on the status of the network
and could generate false alarms. They will be relocated in the UL557 bypass.
Following discussion with the Safety, they will be relocated outside the mini safe
room.
- 48 V dc system (ECD, ECG, ESU): it contains electronics that may be sensitive
to SEE. Its misbehaviour would lead to the power-off of EL safety equipment, 18
KV loop, EYC and AUG racks. In particular the ambient and Safety lightning in UJ
and the tunnel will be lost. To reduce the amount of equipment to be relocated in
the UL557 mini safe room, it was decided to feed directly the Safety lightning
system with 230 Vac through an UPS system located in surface. The 48V dc
chargers will be moved into UL557 bypass mini safe room in order to simplify the
cabling and to be able to replace them (if needed) by new ones (estimated more
sensible to radiation effects).
These relocations have been validated by Safety.
The new electrical layout is available in [6]. Table 3 presents the electrical
equipment to be installed in UL557 after the relocation process.
Table 2. UPS users.
Distribution switch board
User
EOD103/56
EOK103/56 distribution busbar
EOD104/56
EOK104/56 distribution busbar
EOD105/56
EOK105/56 distribution busbar
EOD106/56
EOK106/56 distribution busbar
EOD107/56
EOD1/53 distribution busbar
EOD108/56
EOD1/57 power supply
EOD109/56
Power supply 1 FORCE F3 R561-R562-R571-R572-R58
EOD110/56
Power supply 2 FORCE F3 R561-R562-R571-R572-R58
EOD111/56
Power supply 1 FORCE F3 R531-R52
EOD112/56
Supply 2 FORCE F3 R52
EOD113/56
RESERVE
EOD114/56
Power supply EOJ9/55 USC55
EOD115/56
RESERVE
EOD116/56
Power supply RACK RYCA01-02
EOD117/56
RESERVE
EOD118/56
Power supply RACK CYNET01=UJ56
EOD119/56
Power supply RACK CYNET02=UJ56
EOD302/56
Power supply COFFRETS F3 NEW QPS R52
EOD303/56
Power supply COFFRETS F3 NEW QPS USC55-RR53
EOD304/56
Power supply COFFRETS F4 NEW QPS R58
EOD305/56
Power supply COFFRETS F4 NEW QPS RR57
EOD306/56
Power supply RACK DYPG01
EOD307/56
Power supply RACK DYPG02
EOD308/56
RESERVE
EOD309/56
Power supply CYCIB01=UJ56
LHC Project Document No.
LHC-LJ-ECPage 11 of 20
Table 3. Electrical equipment in UL557 after its relocation from UJ56.
Equipment reference in UL557
(after relocation)
EBD10/56 (new)
EBS11-12/56
ECD1-2/56
ECG1-2/56
EJG11-12/56
EOD3/56
ERD1/56
ESD4/56 (new)
ESU1-2/56
EYC04-07/56
EYU02/56 (new)
Equipment reference in UJ56
(before relocation)
EBS11-12/56
ECD1-2/56
ECG101-201/56
EJG11-12/56
EOD3/56
ERD1/56
ESU304
EYC01-03/56
Function
Low voltage switchboard
UPS cabinet
48 V dc commutation
48 V dc batteries
UPS batteries
UPS distribution switchboard
Power converters switchboard
Diesel switchboard
48 V dc chargers
EL monitoring controllers
AUG system
Relocation in UL557
outside mini safe room
outside mini safe room
in mini safe room
in mini safe room
outside mini safe room
outside mini safe room
outside mini safe room
in mini safe room
in mini safe room
outside mini safe room
in mini safe room
Location in UJ56
(present)
UJ56- level 0
UJ56- level 0- safe room
UJ56- level 0- safe room
UJ56- level 0
UJ56- level 0
UJ56- level 0
UJ56- level 0- safe room
UJ56- level 0 -safe room
1.2.9 CV EQUIPMENT
The control cubicle UIA0-00560 manages the air ventilation units of UJ56 and will
manage in the future those of UL557 bypass. It consists of one process PLC and one
PLC concentrator. The process PLC collects the information, the measurements, the
status of the ventilation in UJ56, RR53, RR57 and delivers alarm to CCC. The PLC
concentrator linked to Ethernet is connected by profibus to the process PLC. A failure
of the PLCs may lead to the loss of the ventilation alarm in the CCC, to the absence of
ventilation supervision in the UJ56, RR53 and RR57. The ventilation may be in an
indefinite state with possibly the overheating of one of the supervised areas. It was
decided to displace the PLCs from their present location in UJ56 level 0 to UJL557
bypass (see Figures 3b and 6).
1.2.10 DC CABLING
by J.C. Guillaume, H. Thiessen
Due to the relocation of the power converters, the DC cables between the converters
and the DFBX must be changed with new lengths and sometime new cross sections,
mainly for the main quadrupole circuit of the Inner Triplet of LSS5R. The Table 4 gives
the new characteristics of the DC circuits with the updated power dissipations of the
DC cables. To facilitate their integration the water cooled DC cables of the main
quadrupole circuit will be split in two. The 2000 mm 2 water cooled DC cables of the
RQX power converter will be realized with two 1000 mm 2 water cooled DC cables in
parallel and the 1600 mm2 water cooled DC cables of the RTQX2 power converter will
be realized with two 800 mm2 water cooled DC cables in parallel. With this
configuration, adapters must be inserted between the water cooled DC cables and the
electrical terminals of the DFBX and the power converters.
Although the main quadrupole circuit of the Inner Triplet of LSS5L is not concerned by
the R2E project, the water cooled DC cables of this circuit will be changed at the same
time to increase their cross sections at 2000 mm 2 and 1600 mm2 instead of 1300 mm2
and 1000 mm2. With the present cables, the nominal parameters (nominal currents
and nominal didts) of the main quadrupole circuit of the Inner Triplet left of 5 cannot
be reached. To avoid this important constraint for the LHC, it is strongly recommended
to replace these DC cables. The Table 5 gives the new characteristics of the DC circuits
of the main quadrupoles of the Inner Triplet left of 5. As for the Inner Triplet right of
5, the water cooled DC cables of the main quadrupole circuit of the Inner Triplet Left
of 5 will be split in two.
LHC Project Document No.
LHC-LJ-ECPage 12 of 20
Table 4. DC circuit characteristics of the IT.R5.
Section
rau 40oC
Resistance
Vcable_ult
Vmagnet
Vtotal_ult
Pcables_ult
Pcables_ult
[H]
[A/s]
[V]
[A]
[A]
[m]
[mm2]
[Ohm.mm2/m]
[Ohm]
[V]
[V]
[V]
[Wair]
[Ww ater]
RCOX3.R5
0.004
1
0.1
100
110
150
35
0.019
0.081
8.91
0.004
9.12
981
0
RCOSX3.R5
0.003
1
0.1
100
110
150
35
0.019
0.081
8.91
0.003
9.12
981
0
RCSX3.R5
0.005
0.5
0.1
100
100
150
35
0.019
0.081
8.10
0.003
8.31
810
0
RCSSX3.R5
0.008
1
0.1
100
110
150
35
0.019
0.081
8.91
0.008
9.12
981
0
RCTX3.R5
0.029
1
0.1
80
86
150
35
0.019
0.081
6.97
0.029
7.20
599
0
RTQX1.R5
0.09
19.333
0.12
550
600
150
240
0.019
0.012
7.09
1.740
9.07
4255
0
RCBXH3.R5
0.287
5
0.12
550
600
150
240
0.019
0.012
7.09
1.435
8.77
4255
0
RCBXH2.R5
0.287
5
0.12
550
600
150
240
0.019
0.012
7.09
1.435
8.77
4255
0
RCBXV3.R5
0.175
5
0.12
550
600
150
240
0.019
0.012
7.09
0.875
8.21
4255
0
RCBXH1.R5
0.287
10
0.12
550
600
150
400
0.019
0.007
4.25
2.870
7.36
2553
0
RCBXV1.R5
0.175
10
0.12
550
600
150
240
0.019
0.012
7.09
1.750
9.08
4255
0
RCBXV2.R5
0.175
5
0.12
550
600
150
240
0.019
0.012
7.09
0.875
8.21
4255
0
RQSX3.R5
0.014
5
0.12
550
600
150
240
0.019
0.012
7.09
0.070
7.40
4255
0
RQX.R5
0.218
6
0.12
6800
7180
75
2000
0.019
0.001
5.09
1.642
6.97
0
36557
RTQX2.R5
0.038
8.777
0.12
4600
4780
80
1600
0.019
0.001
4.52
0.562
5.32
0
21603
CIRCUIT NAME
L TOT MAX DI DT U LEADS I NOMINAL I ULTIMATE Long cables
Table 5. DC circuit characteristics of the main quadrupole IT.L5.
CIRCUIT NAME
L TOT
MAX DI DT U LEADS I NOMINAL I ULTIMATE Long cables Section
[H]
[A/s]
[V]
[A]
[A]
[m]
RQX.L5
0.218
6
0.12
6800
7180
RTQX2.L5
0.038
8.777
0.12
4600
4780
rau 40oC
Rcable
Vcable_ult Vmagnet Vtotal_ult Pcables_ult Pcables_ult
[mm2] [Ohm.mm2/m]
[Ohm]
[V]
[V]
[V]
[Wair]
[Ww ater]
75.00
2000
0.019
0.001
5.09
1.642
6.97
0
56242
75.00
1600
0.019
0.001
4.24
0.562
5.04
0
32405
1.2.11 OVERVIEW OF THE EQUIPMENT TODAY IN UJ56
Tables 6a and 7b present the equipments today installed, respectively, in UJ56 level 0
and UJ56 level 1. They indicate in red the equipment that will remain in its present
location, in green the equipment to be relocated in UL557 or USC55 and in purple the
equipment to be removed / dismantled as it will not be used anymore after LS1.
LHC Project Document No.
LHC-LJ-ECPage 13 of 20
Table 6a. Equipment today located in UJ56 level 0.
Equipment
UIAN -00503
UIAO-00560
water pumps
BRAN area - gaz control
anti-panic lightning unit
ODH detectors,
sirens
fire detectors
mobile shielding control
RAMSES detector
LACS control boxe (YJBC01=UJ56-0)
SAREP -0026 (previously CAR101UJ56)
SAREP-0025 (previously CBR101UJ56)
CTRIO1UJ56
CTER-00540
CYRR01
EAD1-2/56
EBD1-2/56
EBS1/56 *
EBS11-12/56
ECD1-2/56
ECG101-201/56
EJG11-12/56
EMD1/56
EMT103/56
EOD1/56
EOD3/56
EOX01/56
ERD1/56
ESD1-3/56*
ESU303-304*/56
EYP01/56
EYC01-02-03/56
EYB01/56
Function
To be relocated
within R2E
Equipment owner
Contact person
raw water pumps control
air ventilation control
no
yes
no
no
no
no
no
yes
no
no
yes
no
no
no
no
no
no
no
to be removed (no more used)
yes
yes
yes
yes
no
no
no
yes
yes
yes
to be removed (no more used)
no/yes
no
yes
no
EN/CV
EN/CV
EN/CV
BE/BI
EN/EL
GS/ASE
GS/ASE
GS/ASE
EN/HE
DGS/RP
GS/ASE
GS/ASE/AS
GS/ASE/AS
IT/CS
GS/ASE/AS
IT/CS
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
EN/EL
P. Valente
P. Valente
P. Valente
E. Bravin
N. Dos Santos
S. Grau
S. Grau
S. Grau
J. P. Granchelli
A. Day
R. Nunes
S. Grau
S. Grau
F. Chapron
S. Grau
F. Chapron
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
J.C. Guillaume/N. Dos Santos
safety
safety
safety
safety
safety
access
transmission alarms levels 2 & 3
transmission alarms levels 2 & 3
phone
red phone
GSM probe
emergency lightning
GS switch board
UPS cabinets
UPS cabinets
48 V dc commutation
48 V batteries
UPS batteries
HV switchboard
HT transformer
UPS distribution switch board
UPS distribution switch board
PIC alarm box
power converters switchboard
Diesel switchboard
48 V dc chargers
emergency lightning
EL monitoring controllers
LV switchboard protections
(*) Equipment to be removed / dismounted.
Table 6b. Equipment today located in UJ56 level 1.
Equipment
ODH detectors
siren
AUG
anti-panic lightning
UTA
WorldFIP boxes
BY01
CYCIP01
CYCIB01
GYPOS01-02-03
YYASC01-02-03-04-05
QYC01-02-03
CYFIB01
CYNET01-02
CYTIM01
CYFRE01
DYPG01-02
DYXF01
TYCFL01
TYCCR01
RQX.R5
RTQX2.R5
RYMCB02-03-04-05
RYMCC01
RYCA01-02
RYLC01
RYLB01
RYSC01
RYSA01-02
RYSA03-04
Function
To be relocated
within R2E
Equipment owner
Contact person
safety
safety
safety
safety
ventilation
no
no
no
no
no
no
no
yes
yes
yes
only YYASC05
QYC01 and QYC03
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
to be removed (no more used)
GS/ASE
GS/ASE
EN/EL
EN/EL
EN/CV
BE/CO
BE/BI
TE/MPE
TE/MPE
BE/ABP
GS/ASE
TE/CRG
EN/EL
IT/CS
TE/MPE
TE/MPE
TE/MPE
TE/MPE
EN/STI
EN/STI
TE/EPC
TE/EPC
TE/EPC
TE/EPC
TE/EPC
TE/EPC
TE/EPC
TE/EPC
TE/EPC
TE/EPC
S. Grau
S. Grau
N. Dos Santos
N. Dos Santos
P. Valente
J. Palluel
B. Dehning, E. Effinger
B.Puccio, I. Romera Ramirez
B. Puccio, C. Martin, I. Romera ramirez
A. Marin
R. Nunes
J. F. Bel, B. Ivens
A. Gonzalez Puertas
J. Shade, M. Da Costa
R. Chery
R. Chery
R. Denz, M. Zerlauth, K. Dahlerup-Petersen
R. Mompo
A. Masi
A. Masi
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
V. Montabonnet, C. Coupat
BPM
PIC
BIC/ FMCM
Survey
Access/ Safety
Cryogenics
Fibres
Ethernet
Timing
Remote reset
QPS
Current leads heaters
Collimation
Collimation
power converters
power converters
power converters
power converters
power converters calibration system
power converters
power converters
power converters hot spare
power converters spare
power converters spare
(*) equipment to be removed / dismounted.
LHC Project Document No.
LHC-LJ-ECPage 14 of 20
1.3 CIVIL ENGINEERING ACTIVITIES
To minimise cables length and to provide passageways for new cables and pipe work
into UL557 bypass, several ducts will have to be drilled (see Figures 8):
- through the UJ56 separating wall between machine (LHC tunnel) and services area:
5 ducts 2 m long with 350 mm diameter;
- between UL557 and UL558 (‘mur tympan’): 4 ducts 350 mm diameter for cables and
4 ducts 350 mm diameter for cooling pipes (2 for the ‘mini’ safe room);
- between the UJ56 cavern (services area) and the UL557 bypass tunnel: 4 ducts 14
m long with 400 mm diameter.
Before the start of these works surrounding equipment (especially those located in
UJ56 levels 0 and 1 including the ‘safe room’) will have to be protected. The protection
will need to be water-proof as the drilling method will use water. The removal of the
excavated material will be via PM56 lift. The base of the UL557 vault will be cut on the
external wall (opposite to ‘mur tympan’) along 30 m. Three to five centimeters of
concrete will be removed. In order to carry out the drilling activities the Civil
Engineering contractor will require a free space of 2 m clearance from the tunnel wall
and 1 m additional diameter around each duct to be drilled.
The overall time of the drilling/excavation activities is estimated to 15 weeks:
- 5 ducts through the UJ56 separating wall: 2 weeks;
- 4 ducts between UJ56 and UL557 bypass: 10 weeks;
- 8 ducts through the UL557/UL558 separating wall: 2 weeks;
- cut the base of the UL557 vault: 1 week.
3D models showing the ducts to be performed are stored in SmarTeam under the
reference ST0307981_01 for UJ56, ST0307980_01 for UL557 and ST0057895_01 for
UP56.
The mini safe room structure construction and fire resistant doors installation will be,
respectively, performed under the GS/SE and EN/HE responsibilities. These 2 tasks
are estimated to be, respectively, 3 and 2 weeks.
Figure 8a: 4 ducts 14 m long to be drilled between UJ56 and UL557 bypass
LHC Project Document No.
LHC-LJ-ECPage 15 of 20
Figure 8b: 5 ducts to be drilled through UJ56 wall
Figure 8c: 8 ducts to be drilled through the UL557/UL558 separating wall (‘mur tympan’).
1.4 SAFETY CONSIDERATIONS IN UJ561 BYPASS


Sealing: following the CMS, Safety and Radioprotection requests all openings for
cables and pipes performed between UL557 and UL558 will be properly sealed such
that they are leak tight, withstand a fire for at least 90 minutes and a blast of 120
mbar overpressure. In order to preserve the current fire and ventilation compartmentalisations,
both extremities of each hole will be sealed with 80 mm thick plates made of mineral wool and
with external faces covered by a layer of fire-resistant paint. In addition, the cables will be painted
with the fire-resistant paint at the position where they exit of the plates.
Relocation of ‘tablotins’: the relocation of equipment in the UL557 bypass will
interfere with two ‘tablotins- safety organs’ today installed in the bypass (see Figure
2). The ‘tablotin T1’ consists of AUG push button, siren, emergency lightning and fire
extinguisher. The ‘tablotin T2’ consists of AUG push button, siren (with ‘bris de
glace’), emergency lightning and fire extinguisher. For T2 the siren will not have to be
moved as it will not interfere with equipment. The Safety (DGS/SEE) agreed to
relocate the 2 ‘tablotins’ T1 and T2. These relocations are technically feasible (studies
performed by GS/ASE and EN/EL). T1 will be relocated on the other side of the bypass
while T2 will be translated 2 meters away from its current position (see Figure 5).
LHC Project Document No.
LHC-LJ-ECPage 16 of 20



UL557 – bypass framework load resistance: it is proposed to install on the UL557
framework the cooling pipes and part of the cables for the equipment to be relocated
in the UL557 bypass (see Photo 1 and Figure 9). They correspond to an additional
weight on the framework of 1t/m. GS/SE studied the impact of this additional load on
the framework and concluded that the framework will support it [7].
Mini ‘safe room’: Racks today located in the UJ56 ‘safe room’ will be relocated in
UL557. After discussion with Safety colleagues, the equipment owners decided for
safety reasons to relocate part of these racks in a 2 hours fire resistant structure
called ‘mini safe room’ (see Tables 6). A dedicated ‘mini safe room’ will thus be built
in UL557 (see Figure 6). The height of the racks to be installed inside the ‘mini safe
room’ will be limited to 1.80m (instead of the usual 2.20m) due to the presence of
cable trays already installed along the UL557/UL558 separating wall.
Fire detection: see paragraph 1.2.6.
Photo 1. Framework along UL557 bypass- present situation
Figure 9. Cross section of UL557 bypass after equipement relocation
LHC Project Document No.
LHC-LJ-ECPage 17 of 20


Sector door: to minimize the length of the water cooled cables, the power converters
will be relocated at the present location of the YCPS01=UJ561 sector door. As a
consequence this door will be displaced 10 m away into UL56 behind the
ventilation/blast door. In its new location the sector door will allow the full aperture of
the blast door and will be compatible with the passage of the TIM. GS/ASE and the
machine DSO agreed with this displacement taking into account that R2E will ensure
the arrival of the cables to the new sector door location.
Transport volume: in their new location in UL557, the power converters calibration
racks (RYCA01/02) will interfere with the transport volume by 30 cm. It is agreed
between EN/HE and TE/EPC colleagues that EN/HE will inform TE/EPC about each
heavy transport requiring the 2 racks to be pivoted to free the transport volume. The
rotation of the calibration racks will be performed by TE/EPC. It will take half a day.
If heavy transport convoy breaks down in UL557 (between the mini safe room and the
power converters areas), EN/HE foresees a non standard recovery method with a
mechanical jack with cradle (device called ‘recovery’) [8]. Once all equipment will be
relocated in UL557, a transport test (with a wooden mock-up) will be carried out by
EN/HE in the UL557 bypass.
1.5 INSTALLATION PHASES
The equipment relocation is scheduled for LS1. The activities sequences with the coactivities are today defined. The overall implementation to be carried-out during LS1 is
estimated to 57 weeks (14 months) [9]. Table 7 gives a summary of the teams
involved with their estimations of the duration of their respective activities.
During the 2011-2012 winter shutdown, UPS and PIC were relocated. Preparatory
work for BIC relocation and part of the civil engineering activities were also
anticipated. All remaining preparatory work than can be anticipated will be performed
during the 2012 technical stops (e.g., cables trays installation).
The integration layouts changes linked to the R2E relocations were discussed within
the ICL. They are today approved throughout the ICL by the equipment owners and
the services (see Table 8). All the installation drawings will be verified by the
corresponding CERN services, in particular by EN/CV, EN/EL and GS/SE to ensure their
conformity with the 3D LHC integration models. They will be circulated amongst the
services teams and the LHC integration team (EN/MEF-INT). During LS1, survey scans
of the areas will be performed at the end of each major service
installation/intervention. A follow-up of the installation non-conformities will be
performed by the EN/MEF-INT team. In case of a critical non conformity, the
equipment not installed in its nominal location will be removed and then reinstalled
following the installation drawings.
LHC Project Document No.
LHC-LJ-ECPage 18 of 20
Table 7: Teams involved into the R2E relocations activities in Point 5 with the
estimated duration of their respective activities (as provided by the responsible
groups).
Group
BE/ABP
BE/CO
EN/CV
EN/EL
EN/HE
EN/STI
GS/ASE
GS/SE-CE
IT/CS
TE/CRG
TE/EPC
TE/MPE
Equipment / activity
survey equipment
timing & remote reset
WorldFip
pipes/ducts
UTAs
equipment relocation,
cabling & optical fibers
equipment transport
collimator control equipment
fire/ODH detection
access
drill/dig activities
mini safe room
Ethernet
cryogenics equipment
power converters
QPS*
PIC*
current leads heaters
BIS
Duration
[weeks]
3
<1
1
19
6
27
(2 shifts/day)
2
5
5
6
9 (2 shifts/day)
4
3
4
7
1
<1
3
<1
*activities performed outside the LHC hardware commissioning
Table 8: EDMS references of the LHC integration models taking into account the
relocations to be carried out within the R2E Mitigation Project.
Location
EDMS reference
UJ53
UJ56
UJ57
UP56/UL557/UL558
UL54
UL56
USC55 (machine side)
RR53
RR57
1143900
1102744 / 1145767
1143908
1143676
1143902
1143904
1143911
1143898
1143910
LHC Project Document No.
LHC-LJ-ECPage 19 of 20
2. REASONS FOR CHANGE
by AL Perrot
Reduce the risk of misbehaviour due to SEE of the equipment located in UJ56 that
may lead to stop of the LHC machine or jeopardize its correct operation.
3. IMPACT ON COST, SCHEDULE & PERFORMANCE
by AL Perrot
The total cost for the relocation activities is estimated to 3175 KCHF (see Table 9).
These relocations are discussed with the LHC integration team (EN/MEF-LE), the
services and the equipment owners. The new integration layouts are approved
through LHC Integration Committee (ICL). The relocation activities are scheduled by
the LHC planning officers (EN/MEF-OSS).
The present estimate of the hadron flux in UJ56 indicates that SEE may be a limitation
for LHC operation. The modifications proposed would allow for a safer operation and a
decrease of the machine down-time.
Table 9: Cost estimate corresponding to the R2E relocation activities in Point 5 (as
provided by the responsible group, rounded up to 5 KCHF).
Equipment /service
EL
Cooling / Ventilation
Civil engineering
Fire detection
Sector doors YCPS01=UJ561
Access rack
Transport
Network
Survey
Activity
control cabling for electrical distribution
low voltage
optical fibers
DC and control cables installation
UTAs, cooling pipes installation
drilling activities
safe room
UJ56/RR53/RR57 smoke detectors relocation
UJ561 new smoke detectors
displacement
displacement
relocation of equipment
structure cabling, wifi
1 rack
VDSL cabling
GGPSO installation
reference marks
Cryogenics
Collimation control
QPS
False floor on the bypass framework
Metallic structure for UPS
Power converters ('gerbeur')
Group
Contact
Total cost [KCHF]
EN/EL
EN/EL
EN/EL
EN/EL
EN/CV
GS/SE
J C Guillaume
N. dos Santos
A. Gonzalez Puertas
J C Guillaume, N. dos Santos
P Valente
J Osborne
GS/ASE
S Grau
75
410
100
1420
420
265
85
100
10
45
50
20
40
5
GS/ASE, EN/HE
GS/ASE
EN/HE
IT/CS
R Nunes, A. Foreste
R Nunes
C. Bertone
M. Da Costa
EN/EL
BE/ABP
J. C. Guillaume
A. Marin
TE/CRG
EN/STI
TE/MPE
GS/SE
B.Ivens, J. F. Bel
A. Massi, J. Lendaro
R. Denz
D. Parchet
TE/EPC
C. Coupat
5
5
50
35
10
15
5
5
TOTAL [KCHF]
4. IMPACT ON OTHER ITEMS
3175
by A L Perrot
See paragraph 1.2.
5. CHANGE CLASS
by Project Engineer
6. COMMENTS (COMPULSORY)
by Project Engineer
7. COMMENTS (IF REQUIRED)
by other Project Engineers
LHC Project Document No.
LHC-LJ-ECPage 20 of 20
8. COMMENTS (IF ANY)
by PLO appropriate Committees
9. REFERENCES
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
‘R2E FLUKA studies for Point 1 and Point 5’, R. Versaci & al, ATS/Note/2010-046,
October 2010;
‘Residual dose maps, air activation and prompt dose in the adjacent tunnel at IR5’, M.
Fuerstner &al, CERN-DG-2009-057-RP-TN, edms: 1006918;
‘Strategy against SEE for Fire and Oxygen deficiency detection systems’, S. Grau & A. L.
Perrot, Feb. 2011, edms: 1126688, LHC-LJ-EC-0023 v.0.1;
https://edms.cern.ch/nav/P:CERN-0000083951:V0/P:CERN-0000091190:V0/TAB3
www.cern.ch/h4irrad
‘Proposition d'implantation et distribution des équipements EN-EL en UL55 et TZ76,
dans le cadre des déplacements des équipements liés au projet R2E’, N. Dos Santos,
April 2012, edms: 1210200 v.1, ELG-LVNET-EN-0179 v.1;
Private discussions and calculations performed by D. Parchet (GS/SE), January 2011.
Discussion in ICL no. 2011-324, 9th March 2011.
Work by M. Barberan and K. Foraz (EN/MEF-OSS), November 2011:
https://espace.cern.ch/MEFactivitiesforR2E/Planning_Documents/Forms/AllItems.aspx