Strips operations , 2012 outlook

Lino Demaria – INFN Torino

STRIPS OPERATIONS, 2012 OUTLOOK

L.D. : Tracker status - TPO 22/03/2012

2

Strip Tracker Status

Dead channels evolution:<SST> =1.5 2.2%

3

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%

4

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%

5

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

6


Radiation damage

7


Leakage current radial dependence

Strip Tracker Pixel

8


Dependence with Fluence and annealing

9


Model Predictions


10



12

Depletion Voltage

Hybrid temperatures13

Closed CL:3 TIB L3 CL1 TOB L4 CL1 TID R1-R2 CL

NOT to be forgotten !

Silicon Detector temperatures

14

Closed CL:3 TIB L3 CL1 TOB L4 CL1 TID R1-R2 CL


15

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


17


Readiness for 2012


18

LHC challenges this year


20

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

21

Tracker status (1)


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)


22

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


23

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)

24


Cosmics 2012


25

Cosmics in Deconvolution mode



TPO meeting

28

22/03/2012

Charge in Run2011B

29


Beams 2012


30

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


31

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)

32


Backup


33


34

Documents

Strips operations , 2012 outlook