hcal commissioning overview

1

HCAL CommissioningOverview

15.02.2006 Rustem DZHELYADIN (CERN&IHEP, Protvino)

1. What has been done• Cabling• HV-LED mechanics• Signal cable -> CAMAC connection• Detailed study of PMT stability• LED spectra

2. Suspicious PM+CW• ~10 min relaxation• Double peak for LED

3. Access problem• Complete signal cabling layout• Narrow slit between muon filter and HCAL• Interference with muon chambers installation

4. Future

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HCAL CommissioningSignal cabling


Connectorsgrouping

(one mistake found)

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HCAL CommissioningCabling


Protected inside the electronics platform

Top connectorsfed through

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HCAL CommissioningCabling


Cable interface to CAMAC

-made 5 (40 channel)

-needed 12 (+7 connectors)due to module is spreadover 12 cable bundles

C-side A-side

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HCAL CommissioningMechanics for HV-LED boxes


HV-LED housing mechanics done

8 HCAL + 32 ECAL + few spare

Waiting for motherboards

and

SPECS slaves

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HCAL CommissioningHV-LED


HV-LED control board prototype

SPECS slave

0

1

2

3

4

5

6

7

8

9

LED1

LED8

CW power supply

.

.

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.

.

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HCAL CommissioningHV-LED spread over 10 DAC


At least 6 hours per connector

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HCAL CommissioningStability test


Long term study of PM/LED performance with the HV-LED control board (SPECS)

8 9 10 11

12 13 14 15

Typical trace-plot monitoring stability of LED pulse over several hours

- pulse rate ~7.7 Hz- light yield ~7000 ph.e.- gain ~1.5E5

pinD1(off) pinD2(on)+1%

-1%

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HCAL CommissioningStability test (2)


0 1 2 3

4 5 6 7

Non-typical behaviorof ch#2

2

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HCAL CommissioningLED signal study


8 9 10 11

12 13 14 15

LED pulse spectra

WHAT IS IT???

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Two peaks even @ 20s

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HCAL CommissioningSuspicious PM+CW location


mod4

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HCAL CommissioningAccess problem


How to reach there (in the slit of 40cm)

ID Task Name

223 Muon system Installation 224 M5 US side225 M3 US side226 M2 US side227 M4 US side228 M5 PZ side229 M3 PZ side230 M2 PZ side231 M4 PZ side232 M1 station233 Commissioning of Muon elect.234 Chamber installation completed235 Commissioning236 Commissioning

Apr 17 Feb 23Apr 17 May 12

May 15 Jun 9Jun 12 Jul 7

Jul 10 Aug 4Aug 7 Sep 1

Sep 18 Oct 13Oct 16 Nov 10

Nov 13 Feb 8Jan 8 Feb 23

Jul 31 Feb 23Feb 23 Feb 23Feb 23

Feb 5 Feb 23Feb 5 Feb 23

Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May1st Quarter 2nd Quarter 3rd Quarter 4th Quarter 1st Quarter 2nd Quarter

Muon chamber installation schedule

No chance to

access PM-CW during muon

chambers installation

???

HCAL

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HCAL CommissioningFuture


1. Measurement of Gain-HV for each PMT “in-situ”

2. Measurement of Delay-HV on LED-pulse (+7 mini-connectors needed)

3. Measurement of PMT linearity at different HV

4. Radioactive source commissioning and first run

5. Long-term stability monitoring for whole sub-detector

Preparing to the general commissioning of the LHCb detector the following has to be done

Problems still

1. To complete the cabling of HCAL.2. To solve the access problem (priority before June?)3. PinD amplifiers to be screened up (dismantle 104 LED-PinD and install)4. Exhaustive check of all PM-CW at C-side before June!

hcal commissioning overview

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