Rolf LINDNER
Austin BALL
Ludovico PONTECORVO
Werner RIEGLER
On behalf of the LHC experiments
ALICE, ATLAS, CMS, LHCb
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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LHC Experiments activities
during LS2
Outline
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Overview
Experiments program and scope of LS2
Support from CERN partners required
Major challenges ahead
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
3
http://indico.cern.ch/event/448109/
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Overview
ALICE, ATLAS, CMS and LHCb have scheduled significant maintenance
work and upgrade installation for the long shutdown 2 (LS2).
While ALICE and LHCb pursue a major upgrade of the experiment in one
single phase, ATLAS and CMS have envisaged an upgrade in two phases,
spread over 3 shutdowns with the most intense detector activities during
LS3.
The LS2 project started already with advanced preparation well underway.
Specification of cooling systems, electrical distribution, survey tasks, beam
pipe projects, civil engineering work and many other issues are being
discussed with all stakeholders.
Experiments will exploit the pre-LS2 YETS and EYETS as much as
possible.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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Nevertheless, the amount of work, challenges and time pressure the
different collaborations and technical groups from CERN are facing in LS2
will be be very similar for all LHC experiments.
2 Years
3 years left
LHCb & ALICE
major upgrade
ATLAS & CMS
major upgrade
Phase II
ATLAS & CMS
Phase I upgrade
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
5
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ATLAS
& CMS
Phase I
upgrade
ALICE, LS2 upgrade scope
Motivation: Focus on high-precision measurements of rare probes at low pT
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Cannot be selected by hardware trigger
Need to record large sample of events
Goal: Pb-Pb recorded luminosity ≥ 10 nb-1, (plus pp and p-Pb data)
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8 x 1010 events to gain a factor 100 in statistics over the Run1+Run2
programme
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Read out all Pb-Pb interactions at a maximum rate of 50kHz (i.e. L = 6x1027 cm1s-1) upon a minimum bias trigger
Perform online data reduction based on reconstruction of clusters and tracks
Improve vertexing and tracking at low pT
 New Inner Tracking System (ITS)
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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Strategy:
ALICE, LS2 upgrade scope
Muon Forward Tracker (MFT)
• new Si tracker
• Improved MUON pointing precision
MUON Arm
• continuous
readout
electronics
Time Projection Chamber (TPC)
• new GEM technology for
readout chambers
• continuous readout
• faster readout electronics
New Online/Offline computing farm
(O2)
• new architecture
• on line tracking & data
compression
TOF, TRD
• 50kHz PbPb event rate
• Faster readout
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
New Trigger Detectors (FIT)
28th January 2016
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New Inner Tracking System (ITS)
• improved pointing precision
• less material  thinnest tracker
at the LHC
ATLAS, LS2 upgrade scope
Main Motivations:
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Improve the trigger system to maintain low LVL1 thresholds for muons and electrons
Improve rate capability of forward muon detectors
New Small Wheel
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Replace the present first measuring
station of the forward muon spectrometer
Control trigger rate and enhance rate
capability for muon detectors
Calorimeter Trigger Electronics
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Enhanced granularity available at LVL1
Control of the electron and photon rates
TDAQ (Trigger and DAQ)
BIS7/8 (Barrel Inner Sector) installation
FTK (FastTracker) in 2016-2017
AFP (ATLAS Forward Proton detector) in 2016 and 2017
BMG (Barrel Midium G) Installation 2017
3-year detector maintenance
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
8
http://indico.cern.ch/event/448109/
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BIS7-8
New Small Wheels
Calorimeter Electronics
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
9
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ATLAS, LS2 upgrade scope
CMS upgrade scope: LS2
Pixel detector replacement
HCAL (HE + HF) upgrade phototransducer & front-end
EYETS 2016-17
Full opening:
LS2
Magnet: Install cooled freewheel thyristor or diode switch in power circuit.
Install revised yoke opening system
Beam pipe: replace all chambers except central + test RP shielding
Endcap muon stations ME2/1,3/1,4/1 (UXC,SX5): readout upgrade
GE1/1: install new detector layer
HCAL
(HB): upgrade phototransducer + front-end
(HE): contingency plan for replacement of 30% of active elements
Surface buildings
Completion of: SX5 extension, new barrack, UPS barn,
SCX control room consolidation, SX5 assembly area extension
3-year detector maintenance (40-50% of total activity)
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
10
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VAX/TAS region prep for HL-LHC revision in LS3
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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CMS: on-detector upgrade scope to end LS2
LHCb, LS2 upgrade scope
Luminosity
Run2 4 x 1032 cm-2 s-1 (2 x nominal)
->Upgrade: 2 x 1033 cm-2 s-1
(Triggerless) Read-out
Run 2 1 MHz -> Upgrade 40 MHz
To cope with the enormous increase of events to be evaluated, a larger CPU farm will
be unavoidable. As space and cooling/power capacities are limited in the UX, a new
‘Data Center’ at the surface is in planning.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
12
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Increasing the read out to 40 MHz and the
higher luminosity necessitates replacing
almost all front-end electronics and the
majority of detector systems.
LHCb, LS2 upgrade scope
Replace readout boards and
DAQ network
Outer Tracker/ Inner Tracker:
Replace with SciFi Tracker
Add shielding behind RICH
RICH:
HPDs and FE to be replaced
modified optical system of RICH 1
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
Calo:
replace FE
remove PS/SPD/Lead wall
Muon:
replace BE
remove M1
28th January 2016
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Velo & TT:
Silicon sensors to be replaced
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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Support required during LS2 and (E)YETS
Cooling and Ventilation
ALICE
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New water cooling plant for Inner Tracking System (ITS) and MFT detector upgrade (before LS2).
Possibly upgrade of the dry air ventilation system for the trackers (during LS2).
O2 computing facility at P2, technology decision in 2016, (implementation before LS2)
TPC cleanroom at P2 with new ventilation system, ITS cleanroom Bat. 167 (CV or SMB?, 2017)
Ventilation of new visitor center at P2 (2016)
ATLAS
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Renewal ventilation control system (CV)
Refurbishment of cooling distribution in UX15 to reduce temperature gradients in cavern
Study how to reduce pressure jumps that may harm detectors (TRT/RPC)
Upgrade of Muon cooling station to include NSW detector cooling
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Upgrade HVAC control system
Eliminate sudden UXC pressure changes but ensure pressure differentials in operation
Add 1.5 MW chilled water capacity for Phase 2 detectors
Water production & distribution control system
Compressed air : extend dry gas, consolidate pneumatic control
LHCb:
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New and upgraded detector cooling plants have to be prepared, constructed and installed.
VELO, UT, RICH, SciFi – before LS2
Cooling for the CPU farm, final technology to be decided soon .
Pressure differentials shall comply with RP requirements. Only for Run II a derogation exists.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
15
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CMS
Electrical distribution & cabling
ALICE
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2 x 2.5MVA transformers for O2 facility (EYETS 2016/2017)
Large UPS installed in LS1 probably sufficient
12k optical fibres to be installed
Significant cabling campaign: Removal of services, new patch panels, connectors, services,
cables etc. through EN cabling contract.
ATLAS
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Upgrade and refurbishment of several switch boards (2016-1017)
Upgrade of UPS for electronics racks in USA15 to 2 MVA (LS2)
Consolidation of central UPS Distribution in USA15 (LS2)
Cabling for the new detectors
CMS
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Upgrade UPS: Computer farm 3 x 500kVA (pre-LS2)
Detector UPS from 4 x 500kVA to 5 x 500kVA (n+1 redundant) (LS2)
Electrical distr. for additional cooling/dry gas/UPS + extended detector labs in SX5
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Power for ‘Data Center’.
• Primary supply 2 x 1.5MVA transformer, power for services. (EYETS 2016/2017 ?)
~17k optical fibres through PM shaft (close collaboration with access and LHC cryo)
• All major supports are in place and test installation successful. Provider for the OF still
to be defined, expect in-kind contribution from institute.
Electrical distribution for new/modified detector cooling units.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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LHCb
Beam Pipe
ALICE
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New central beam pipe ordered Q3 2015, delivery Q2 2017.
Bake-out equipment and installation chariot (2017)
Removal of beam pipes at the start of LS2, installation and bake-out of new beam pipe 'middle' of
LS2.
ATLAS
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No new beam pipes foreseen
But full dismounting of beam pipes except the inner section (Venting, access protection etc.)
CMS
Full beam pipe dismount, (Venting, access protection etc)
Replacement of conical chambers (EC +HF)
Preparation for replacement in LS3 of : TAS + fwd chambers.
LHCb
Entire beam pipe to be dismantled and re-installed second half 2020.
• Venting, access, protection, storage etc. – the full chain at day one of LS2!
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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Survey
ALICE
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Significant survey activity during opening of the detector, installation of the TPC chambers and
re-installation of the entire detector.
Close collaboration with survey group already now, defining survey strategy.
Metrology for tracker upgrade
ATLAS
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Usual activities related to every YETS or Shutdown
Survey related to new detectors
• During NSW construction: measure of spacer frame+measure of assembled sector (16-17)
• NJD measurement (2017), NSW measurement at B191 after integration, 2018-19
• BIS 7/8 measurement after installation
CMS
Opening & closing sequences (1/3 of operations are survey) & re-baselining of survey mesh.
Special focus on: new beam pipe vacuum chambers new endcap muon detectors
• LHCb
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Survey already during the construction and assembly phase, regular survey while installing
systems and survey after installation is completed.
Metrology for VeLo
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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Handling
ALICE
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Opening of ALICE (shaft shielding, cavern shielding, mini-frame, TPC to surface) in 2 shifts at the
beginning of LS2.
Special transport of TPC from cavern to cleanroom.
Installation of the entire ALICE upgrade during 2020.
ATLAS
• On top of usual activities, specific needs are identified for
NSW integration
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Transport of NSW chambers (BB5, Bld 180) from 2016-2018
JD shielding & NSW at B191 : 2 crane drivers (part time) from end2016 to mid-2019
Transport NSW from 191 to P1 and SW from P1 to 191 2019/20
CMS
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On top of usual activities, specific focus identified for: GE1/1 transport/installation
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Dismantle ~33% of shielding wall
• For passage of detector services
Dismantling and installation of new detectors, support and
access structures.
Large object to be dismantled:
• PS, SPD and lead wall, Outer Tracker, M1 station
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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LHCb:
Civil engineering
ALICE
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New visitor center (2016/2017)
Baseline for O2 computing facility is a commercial container (choice end 2016). Infrastructure
and noise protection needed.
ATLAS
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Enlargement of SR1 building (+300 sqm) including the exisiting clean room
CMS
• Extension/Annexe to SX5 surface building (1000 m2)
• Re-equip SX5 heavy maintenance areas as lab space for Phase 2 build/maintenance
• Replacement of barracks & storage barns overwritten by HL-LHC buildings
• Probable construction of a UPS barn
• Modify SX5 and SDX roofs for endcap cal extraction/lowering by “crawler crane”
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The new ‘Data Center’ will require preparation of new housing.
Technical gallery from SCX to ‘Data Center’ and to transformer
Storage for detector parts that will be recuperated, stored or become radioactive waste
• Final disassembly can and will not take place in the underground
• Requires storage space for large detector parts, with some components being radioactive.
• Need protected area for storage of concrete blocks from the shielding.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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LHCb
Safety & Radiation
ALICE
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Safety coordination for work package analysis of P2 activities. Support for radiation safety.
ATLAS
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Work package analysis for safety, including radiological risks, will be a major activity before
and during LS2
Study of storage of the Old Small Wheel has to be finalized
CMS
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Work package analysis for safety, co-activity & radiological risks,
Storage of removed beam pipe & detector elements to be finalized
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Due to heavy handling, many co-activities, users & contractors and very tight schedule a
safety coordinator will be mandatory.
• Shall attend meetings, providing advice to users, contractors and staff.
Radiation protection
• LHCb provides personnel for low risk and low duty tasks already (RPE and RPA).
• Additional support will be required, mostly during the dismantling phase.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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LHCb
Others – crane, lift
ALICE
Replacement of
• lift to the cavern
during EYETS
ATLAS
Replacment of
• PM15 lift
• PX15 lift
April 2019-June 2019
Dec 2020 Jan 2021
CMS
Replacement
• lift in PM54 shaft
• Add. crane in expt cavern
(during 2017 run after end April 2017)
(YETS 2017-18)
Replacement of
• two 40t cranes in UX
• PX lift
during EYETS
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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LHCb
Major challenges ahead
Similar activities at all LHC sites in parallel
• Dismantling/re-installation of the beam pipe
• Removing/installing/re-installing detectors
• Cabling/fibre-installation
• Survey
• Handling
• Safety coordination
• For some projects, workload almost at the size of the initial experiment’s installation,
• Clearly less resources
• Smaller time window
• Considerably reduced preparation period
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
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but:
Major challenges ahead cont.
• In addition to CERN staff and contractors at the experimental site, > 50
institutes are involved in the upgrade projects, have to be coordinated and
• depend very much on the flexibility of all partners at CERN
• with restricted time-flexibility and rely on the commitment of CERN
personnel.
• All regular maintenance works at all LHCexp sites are in parallel to the
• Extremely tight planning for the construction, consolidation, maintenance,
installation and commissioning in LS2 - shifts might be an option.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
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upgrade!
Conclusions
• All LHC experiments have a vast number of actvities as part of the L2 project.
• Projects have been forwarded into PLAN and discussions with all stakeholders
are continuing.
• Experiments will heavily rely on efficient collaboration with all technical groups
at CERN
• Similar work requiring same expertise for several projects at all sites at the
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 Strategy
and Preparation.
28th January 2016
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same time