LHC Experiments activities
during LS2
(20 min)
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 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
2
Outline
•
•
•
•
Overview
Experiments program and scope of LS2
Support from CERN partners required by the
experiments
Major challenges ahead
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
3
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 a gradually upgrade over
three phases with the main activities during LS3.
Nevertheless, the amount of work, challenges and time pressure the
different collaborations and technical groups from CERN are facing shall be
very similar for all LHC experiment.
The LS2 project start already with its preparation well in advance.
Specification of cooling systems, electrical distribution, survey tasks, beam
pipe projects, civil engineering work and many other issues are discussed
with all stakeholders.
Experiments will try to profit from the YETS and YETS as much as possible.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
2 Years
LHCb & ALICE
major upgrade
3 years left
ATLAS & CMS
major upgrade
Phase II
ATLAS & CMS
Phase I upgrade
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
ALICE, LS2 upgrade scope
Motivation: Focus on high-precision
measurements of rare probes at low pT
•
•
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)
•
8 x 1010 events to gain a factor 100 in
statistics over the Run1+Run2 programme
Strategy:
•
•
•
Read out all Pb-Pb interactions at a maximum
rate of 50kHz (i.e. L = 6x1027 cm-1s-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 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
ALICE, LS2 upgrade scope
New Inner Tracking System (ITS)
• improved pointing precision
• less material  thinnest tracker
at the LHC
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
Muon Forward Tracker (MFT)
• new Si tracker
• Improved MUON pointing precision
MUON Arm
• continuous
readout
electronics
New Trigger Detectors (FIT)
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
ATLAS, LS2 upgrade scope
Main Motivations:
• Improve the trigger system to maintain low LVL1 thresholds for muon and
electrons
• Improve rate capability of forward muon detectors
New Small Wheel
•
•
Replace the present first measuring station of
the forward muon spectrometer
Control trigger rate and enhance rate capability
fo muon detectors
Calorimeter Trigger Electronics
•
•
•
•
•
•
•
•
Enhance granularity available at LVL1
Control of the electron and phton rates
TDAQ
BIS7/8 installation
FastTracker (FTK) in 2016-2017
AFP in 2016 and 2017
BMG Installation 2017
Infrastructures
•
•
Electrical services
Cooling and Ventilation
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
BIS7-8
New Small Wheels
ATLAS, LS2 upgrade scope
Calorimeter Electronics
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
CMS, LS2 upgrade scope
Full opening:
Many logistic
configurations
Install revised opening system
Replace all beam pipe except central section & test RP shielding
Upgrade readout of endcap muon stations ME2/1,3/1,4/1 (UXC,SX5)
Install new muon station GE1/1
Finish Hadron Calorimeter Phase 1 upgrade: HF electronics
HB/HE phototransducers
Possible replacement of HE mega tiles (depending on YETS 16-17)
VAX/TAS region prep for HL-LHC revision in LS3
3-year detector maintenance (40-50% of total activity)
Major infrastructure revisions:
Underground HVAC control, control room HVAC.
Chilled water (increase capacity)
Water production & distribution control system
Pneumatic control compressed air system
DAQ UPS (1.5MVA)
DSS/RSS upgrade?
3-year services maintenance as LS1
Surface buildings
Construction/completion of SX5 extension
Complete SCX control room consolidation
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
CMS, LS2 upgrade scope
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
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
Increasing the read out to 40 MHz and the
higher luminosity necessitates replacing
almost all front-end electronics and the
majority of detector systems.
To cope with the enormous increase of events to be evaluated, a larger CPU farm will
be un avoidable. As space and cooling/power capacity are limited in the UX, a new
‘Data Center’ is in planning at the surface.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
LHCb, LS2 upgrade scope
Outer Tracker/ Inner Tracker:
Replace with SciFi Tracker
Velo & TT:
Silicon sensors to be replaced
RICH:
HPDs and FE to be replaced
modified optical system of RICH 1
Replace readout boards and
DAQ network
Calo:
replace FE
remove PS/SPD/Lead wall
Muon:
replace BE
remove M1
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Support required during LS2 and (E)YETS
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Cooling and Ventilation
ALICE
ATLAS
•
•
•
•
Renewal ventilation control system (CV)
Refurbishment of cooling distribution in UX15 to reduce 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
CMS
LHCb:
•
•
•
•
New and upgraded detector cooling have to be prepared, constructed and installed.
VELO, UT, RICH, SciFi
Cooling for the CPU farm, final technology to be decided soon
Pressure differentials shall comply to RP requirements. Derogation only for Run 2 exists.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Electrical distribution
ALICE
ATLAS
•
•
•
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)
CMS
LHCb:
•
•
•
Power for ‘Data Center’.
• Primary supply 2 x1.5MVA transformer, power for services.
~17k optical fibres through PM shaft (close collaboration with access and LHC cryo)
• All major supports are in place and test installation successful. Provider of 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 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Beam Pipe
ALICE
ATLAS
• No new beam pipes foreseen
• But full dismounting of beam pipes except the inner section (Venting, access protection
etc)
CMS
LHCb
Entire beam pipe to be dismantled and re-installed.
• Venting, access, protection, storage etc. – the full chain at day one of LS2!
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Survey
ALICE
ATLAS
• 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
LHCb
Survey already during the construction and assembly phase, regular survey while
installing systems and complete survey after installation is completed.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Handling
ALICE
ATLAS
• On top of usual activities, specific needs are identified for
NSW integration
•
•
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
CMS
LHCb:
•
•
•
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 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Civil engineering
ALICE
ATLAS
• Enlargement of SR1 building (+300 sqm) and enlargement of clean room therein
CMS
LHCb
•
•
•
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 disassembling 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 stage of concrete blocks from the shielding.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Safety & Radiation
ALICE
ATLAS
• 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
LHCb
•
•
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 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Major challenges ahead
Similar activities at all LHC sites in parallel
• Dismantling/re-install beam pipe
• Survey
• Handling
• Safety coordination
• Experiments are composed of many different institutes.
• Depend very much on the flexibility of all partners at CERN.
• Collaborators rely on the commitment of CERN personnel.
• Sequence of tasks will be difficult to follow, sometimes.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Major challenges ahead cont.
Final decision on technical aspects might come late in some cases, due to
new and fast changing developments, political decisions and financial
impacts.
• Have to accept crude estimation in some areas.
• Work hard to minimize all open issues as early as possible.
• All regular maintenance works at all LHCexp sites in parallel to the
upgrade!
• Extremely tight planning for the completion of the upgrade installation for
LHCb and ALICE in LS2, shifts are an option.
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
Conclusions
LHC Performance Workshop
Session 8: (E)YETS and Long Shutdown 2 28th January 2016 http://indico.cern.ch/event/448109/
Strategy and Preparation.
24