Transcript Normalized amplitude - Indico

XCAL commissioning with LED
Outline
• ECAL HV system test
• HCAL-A middle term stability test.
Planning
ECAL stability test
LHCb CALO commissioning meeting 16.06.08
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Anatoli Konoplyannikov /ITEP/
ECAL HV system study
After a fruitful meeting with Jacques, some tests of one ECAL HV board with
different configuration have been done by Tengiz, Yuri and me in the aim to
improve the system maintenance.
• The test confirmed the some oscillation behavior of the CW bases;
• In the same time the CW base maximum over current for one 40 channels
group has been measured. Maximum current is less than 0.4 A;
• It seems, the reasonable solution to stabilize the HV system has been found:
 We decided to add in parallel with existing fuses the normal fast fuses of 0.5 A
(as it was foreseen in original design).
 During a few days this solution was tested and no any problems have been
observed. During the test all possible combinations of LV and MV powers
switching ON/OFF were tested.
 One natural power cut was happened in the test time, but no any fuses have
been destroyed.
 The solution with a 100 ohm current limiting resistor has been tested too. It
improves the system stability, but a noise test will be needed to validate this.
LHCb CALO commissioning meeting 16.06.08
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Anatoli Konoplyannikov /ITEP/
XCAL commissioning with LED
Description of the collected data
Basic LED timing Scan
Data collection 9.06.08 – 10.06.08
HCAL-A middle term stability test:
The first night test for middle term PMT stability study has been done in the night from 9 to 10 of
June.
The file 24432 was collected with Yuri during 13 hours and 43 min of the night and started at
19:30.
The conditions of the data taken was following:
1. The HCAL DAQ collects 1600 LED events (one time point) with trigger rate 56 Hz then wait 5
minutes and collects again. The total amount of the time points is 150.
2. The time adjusted recipes has been loaded to the PIN FE boards and LEDTSB board.
HCAL - A:
HCAL data (1600 ev/point, each PMT flashing by 1/8 trigger freq, points=150, tot_ev= 240000,
Calibration trigger rate = 56 Hz):
/castor/cern.ch/grid/lhcb/data/2008/RAW/HCAL/PHYSICS_TimeScan/24432/.....
HV = nominal , LEDTSB_del=150 ns; LED_intens=nominal cnt; FErecipe-Default with corrected
PIN time settings
First data analysis was done.
LHCb CALO commissioning meeting 16.06.08
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Anatoli Konoplyannikov /ITEP/
XCAL commissioning with LED
Basic LED timing Scan
First look on the data
Normalized amplitude
Eight LEDs stability measured by PIN
< +- 0.1 %
Eight tubes stability (Not normalized on PIN )
Normalized amplitude
hour
SpecsServer restart time
< +- 0.4 %
Typical HCAL-A LED and PMT stability
Each point corresponds of the mean value
of PM amplitude for 200 events
HCAL module 28
LHCb CALO commissioning meeting 16.06.08
hour
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Anatoli Konoplyannikov /ITEP/
XCAL commissioning with LED
Basic LED timing Scan
Normalized amplitude
First look on
the data
LED stability
measured by PIN
channel 20.
PIN
Unexpected LED
behavior
PMT
16 channel responses
of the HCAL module 49
hour
LHCb CALO commissioning meeting 16.06.08
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Anatoli Konoplyannikov /ITEP/
XCAL commissioning with LED
Normalized amplitude
First look on the data
Normalized amplitude
HCAL cell 54546
HCAL cell 49818
hour
hour
Normalized amplitude
Only three (of total 744) HCAL-A
problematic channels have been
found
HCAL cell 54814
First look on
the data
LHCb CALO commissioning meeting 16.06.08
hour
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Anatoli Konoplyannikov /ITEP/