VELO hardware and commissioning

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26 January 2009 VRR09 Eddy Jans 1

VELO hardware and commissioning

• installation status• ECS and Tuning• VELO-detector status• DAQ aspects• Spares

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InstallationPLATFORM C3 + motion control

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• 2 detector halves with each 21 individually commissioned VELO-modules are installed in the VELO-vessel since Oct. ’07 • 2*42 Repeater boards• 2*7 Control boards• 2*42 TELL1’s with 4 ARx cards each• 2*3 Temperature boards• 10+11 A3009 CAEN LV-modules, 3*48 V power supply• 2*3 EHQ 607n-F Iseg HV-modules• 2*1 Maraton power supply• 1 Interlock Box• vacuum system + PLC-system for control• motion system + PLC-system for control• cooling plant + PLC-system for control

All installed, cabled and debugged individually and later operated collectively.

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• 84 (100%) working HV-channels• 84 (100%) working LV-channels• 84 (100%) working Control Board channels• 336 (100%) working Temperature Board channels• 84 (100%) working Repeater Boards• 80 (95%) working TELL1s. This week 84 (100%) • 170.0k (98.8%) usable strips. Consistent method to measure and determine dead/noisy strips is under construction.

Ancillary equipment and silicon sensors

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ECS and Tuning• Individual PVSS-projects developed over the last 3 years• Collection of projects and FSMs operational since 8 months• Continuously under development. Main remaining points: - Tuning of the timing: * ADC sampling point Done * Trigger and TestPulse via Control Board and TELL1 - TELL1 recipes: default, TP, NTP, ZS, NZS, ErrorBanks - Tuning of the gains - Improve on the OPC-server of Iseg - Extend software interlocks - Develop procedures for data taking, analysis, parameter determination, upload via XML-description to hardware and database.Concerns: experienced VELO-manpower, TELL1 supportPlanning: ready by May 1

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• Internal progress reports and discussions in the weekly VELO-commissioning meeting. Also used for planning of activities for coming week(s). (minutes, project plans, etc.)

• Invested a lot of effort in writing documentation, operation manuals, power-up/power-down procedures and VELO-shifters training See: https://lbtwiki.cern.ch/bin/view/VELO/VELOOperatingManuals

• ELOG and databases play a more and more important role

Organization and documentation

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VELO statusVacuum

complex system of pumps,valves and gauges toprovide:- good and reliable vacuum in LHCb beam pipe and VELO-detector- maintain small diff. pressure between the two volumes during pump down and venting

Functioned continuously according to specs during the last 2 years and various pumping/venting cycles.

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Pumpdown on June 18, 2008

10-8

10-6

10-4

10-2

[mbar]

detector volume

beam volume

after2 months

of pumping

2x10-6

3x10-90h00 12h006h00

It takes 3 hours till green big valve GV302 may be opened

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Motion

• Actual movement is controlled by a PLC-program

• Precise position is given by 3 resolvers: XA, XC and Y

• Reproducibility <10 m

• Interlocked with LHC beam abort system.

C-side

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Con

dens

er

PumpHeat exchanger

evaporatorRestriction2-Phase

Accumulator

Hea

t in

Hea

t in

Hea

t out

Hea

t out

shielding wall VELO

detector

coolingplanton C3

Cooling

800 W cooling power/side available,while ≈400 W is needed

60 m

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10 15 20 25 30 35 40 45 50 55 60 65 70-50

-40

-30

-20

-10

0

10

20

30

Time (Hours)

Tem

pera

ture

(ºC

)

- 30

20

10

0

-10

-20

- 40

T [oC]

module base

rf-foil

setpoint

silicon

without heat load

- setpoints tested: 0, -10, -20, -25 and -30 oC- powering a module leads to an increase of Tsilicon of

16oC - cooling system worked reliably for months within specs- additional feature of cooling at +10 oC with backup chiller

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R-sensor -sensor

____ raw noise____ Common Mode Corrected noise

Noise performance of fully depleted sensors

Detector performance

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Noise of collective power-up of VELO in the pit

all R-sensors all-sensors

- No additional noise contribution due to collective powerup- Influence of nearby passing beam still needs to be seen

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S/N from ACDC3R-sensors -sensors

- Noise measured in ACDC3 ≈ that in IP8- Experimental setup and settings used in ACDC3 very comparable to those in IP8. So comparable gain expected (S/N)pit ≈ (S/N)ACDC3 (to be confirmed with TP-data)

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DAQList of main items being worked on:

• NZS-data (151 kB/side) and round robin mechanism (select mode, data rate, etc. Ready by April 1)

• run at high rate (# of TELL1s, network, # farm nodes, TAE factor. Investigation ready by April 1)

• error banks: generation, inspect contents, possibility to generate NZS data if error bank present (Ready by April)

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Lab 8

The need to be able to testthe electronics of a VELO-slicein the on-line environment made us set up “Lab 8” in theVELO-office on the secondfloor above the LHCb controlroom. Now we have a testing and development area, decoupled from the real VELO-detector.

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Spares situation

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Summary

Commissioning of the VELO-detector is well advanced.

Main things still to be finished are:- Create sufficient hot spares of all crucial components- Development of tuning scripts (timing, gain, bad strip list), parameter determination and corresponding uploading to hardware and databases- Increase % of working channels (mainly TELL1s)- DAQ action list: NZS-data, high rate, error banks

Documents

VELO hardware and commissioning