1. Business Structure Financial Highlights Review of Operations Outlook Agenda 2.
Strips operations , 2012 outlook
description
Transcript of Strips operations , 2012 outlook
Lino Demaria – INFN Torino
STRIPS OPERATIONS, 2012 OUTLOOK
L.D. : Tracker status - TPO 22/03/2012
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Strip Tracker Status
Dead channels evolution:<SST> =1.5 2.2%
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1 CR shortHV shorts
Lost 1 CR
% o
f dead c
hannels
HV open
CR shorts
<SST> = 1.5 2.2%
Strip Tracker @ 97.8%Begin 2011
Channels excluded from DAQ: time evolution <SST> =1.5 2.2%
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2 TIB CoolingLoop closed
1 CR shortHV shorts
Closed CL recommisioned
Lost 1 CR
% o
f dead c
hannels
1 TID CoolingLoop closed
1 TID CoolingLoop recommissioned
HV open+ 1 CL closed
CR shorts
<SST> = 1.5 2.2%
We were able to promptly recover modules associated with closed cooling loopsThey were recovered before physics data taking, both during 2010 and 2011
Short in CR: 0.35%Recoverable at LS1Work@Patch panel
Short in CR: 0.35% Recoverable at LS1work@Patch panel
Lost CR: 0.35%
HV shorts
Alive channels: 97.75%
– TIB 94.3%– TID 98.1%– TOB 98.2%– TEC 98.9%
Details:– 2 CR in short (~0.7%)– 1 CR missing (0.35%)– HV lines missing(0.1%) – HV lines shorts (0.7%)– fibers/CCU /others
(0.4%)
Recoverable at LS1: 2-3 CR
corresponding to 0.7-1%
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NEW : TOB 3.1.2à one TOB control ring (layer 3) that now needsredundancy to skip one CCU (6 modules)à happened last year directly at HI startup
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L.D. : Tracker status - TPO 22/03/2012
Radiation damage
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Leakage current radial dependence
Strip Tracker Pixel
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Dependence with Fluence and annealing
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Model Predictions
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Depletion Voltage
Hybrid temperatures13
Closed CL:3 TIB L3 CL1 TOB L4 CL1 TID R1-R2 CL
NOT to be forgotten !
Silicon Detector temperatures
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Closed CL:3 TIB L3 CL1 TOB L4 CL1 TID R1-R2 CL
L.D. : Tracker status - TPO 22/03/2012
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Strip Tracker cooling
Now running at 4C, stable. Low leak in SS2 Crucial for Tracker future the running at low
temperature after LS1 (more on Ettore’s talk) Cold test done this year is missing a flow measurement on
main circuit (to be done next TS) Upgrade needed for Primary Cooling (Evaporator; maybe
also Compressor) and for our two cooling plants (SS1 and SS2)
Understanding the scenario of running at -25C (not obvious for cooling system and for humidity in services)
Crucial decision this year (spring) for the lifetime of the detector - Good work of the Cooling Working Group
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Readiness for 2012
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LHC challenges this year
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Perspective for 2012 pp running:High PU and 25 ns Operations
High Pile-Up High Pile test run very
successful We can take data with 5 1030
cm-2s-1/bunch at 110 kHz of zero bias L1 triggers (PU=30)
We expect to be fine for 7 1033 cm-2s-1, 50 ns bunch spacing environment
25 ns The SiStrip Tracker was
designed for 25 ns operations
Test runs were successful Small increase of OOT PU
TK General 28-Nov-2011Lino Demaria - Strip TK operations summary, YETS plans,
2012 outlook
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Tracker status (1)
L.D. : Tracker status - TPO 22/03/2012
Recent Achievements Data for alignment:
0.75M good tracks with B=0 0.86M good tracks with B=3.8T
other 1.24M needed before June (=3.5 days of cosmics data taking)
DCU calibration taken IV scan done DAQ team fixed the problem of Tracker
configuration (see Derek presentation on Monday)
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Tracker status (3)
Problems under work FED configuration problem (few FPGA not well configured) –
affect at low level APV-APVE timing mismatch
No change on Tracker hardware GT-TTCmi cables changed (1-2ns)
Past problems were solved with APVE firmware changes
S/N decreased of up to 5% in cosmics taken on peak Early 2012 cosmics in deconvolution were fine (timing seems fine) Evidence of radial dependence shown Offline producing more plots
Others TEC-4.8 looses clock/trigger time to time
Discussion with ring expert needed – Erik organizing that TEC+ interlock
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Tracker Status (2)
Test still to be done – outside beams Noise vs bias scan Power Scan
Planned test during first collisions 3.5M events with one colliding bunch (first fill 1-
2h) Full HV-scan (2h) Delay run (0.5h, data ok for physics)
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Cosmics 2012
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Cosmics in Deconvolution mode
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TPO meeting
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22/03/2012
Charge in Run2011B
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Beams 2012
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CMS scheduling for first collisionshttps://twiki.cern.ch/twiki/bin/viewauth/CMS/CollisionsMar2012
first 3x3 bunches Tracker peak mode
First 48x48 fill Timing run
Second 48x48 fill Tracker bias scan
84x84 fill Pixel bias scan ES at high gain Tracker delay run
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Conclusions and toughts
Tracker ready for collisions this year No problem seen for high pile-up not radiation damage DAQ is always under-pressure DCS is loosing people – going to central support
We need to be careful on evolution of dead parts Dead part at 2.25% (~1.3% in TIB) Parts without cooling to be better understood (thermal
instabilities / temperature) Cooling performance + radiation damage = lifetime of
Strip Tracker Tracker should survive up to LS3
On radiation damage: only few people working on it In INFN there are several experts that could contribute (many
participant to RD50)
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Backup
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