Download presentation
Presentation is loading. Please wait.
Published byClare James Modified over 9 years ago
1
On behalf of joint ITEP / IHEP team: A. Arefiev, N. Filimonov, T. Kvaratskheliya, I. Machikhiliyan, P. Shatalov, T. Zakoryuchkina, A. Zhokhov, S. Zvyagintsev ECAL: status and plans Irina Machikhiliyan, 23.02.2009 Outline: A-side C-side Lab activities Further plans
2
ECAL A-side Irina Machikhiliyan, 23.02.2009 C-W modification is almost finished: Outer / Middle region are done; Few boxes are still missing in the Inner section; Is it possible to start the installation this week in order to start the commissioning in the end of the next week / beginning of the week after the next? Last week: installation and check of the HV-boxes system: Successfully passed test procedure For a moment is disconnected from power supplies (safety for the future installation of PM/C-W) Green: ready for installation; White: to be done;
3
Commissioning of the ECAL C-side Irina Machikhiliyan, 23.02.2009 Took place in the week of 2 – 8 Feb Reference data samples: #43821 PM HV nominal, LED LV = (nominal + 1V), 1K of 5 TAE events, LED trigger rate 56 Hz (taken 08.02.09) #43822 PM HV nominal, LED LV nominal, 1K of 5 TAE events, LED trigger rate 56 Hz (taken 08.02.09) #43815 PM HV nominal, LED LV nominal, ~52.5K of events, LED trigger rate 3 Hz, 5 TAE events (almost 5 hours stability run, taken 07.02.09)
4
Irina Machikhiliyan, 23.02.2009 Test program: -Check of the functionality of PMs / LEDs: several cables were not plugged, fixed; 5 doublets PM/C-W showed small C-W noise tails, replaced; -Connectivity test (swapped cables): some swapped control cabling in the Inner section, fixed; -Pulser test to check connectors quality (thanks to Jacques): 3 connectors on signal cables on PM side, replaced; -Adjustment of integrators; -Update of connectivity in Database; -~5 hours stability measurements; Remaining problems / tasks: Cells O 15/37(09/11/31) and M 01/29 (11/08/09) – problem on FEB side according to pulser test (Jacques knows); Couple of cells showed instability: to be watched further to understand the reason; One LED (C1.16.1) is unstable (problems is known since the last year, LED driver will be replaced); For a moment: LED intensities are not optimally adjusted. It does not make sense to do it now: they will be tuned after the calibration of PM gains will be done; PIN system functionality is not yet checked. To be done (data are collected, to be analyzed); Commissioning of the ECAL C-side
5
Irina Machikhiliyan, 23.02.2009 r.m.s. of pedestal distribution Relative signal deviation, 4.8 hours Relative signal deviation, ~4 hours Response on LED, nominal settings; (!) 7 cells: amplitude is below 150 counts (!)
6
Irina Machikhiliyan, 23.02.2009 Equipment used: High voltage probe TENMA - 72-3040 + FLUKE 45 MULTIMETER Both checked with NIM Power Supplies - N470 in the range of output voltages 0÷1.3kV: accuracy of the measurement is on the level of 0.1% Measurement conditions: 14 C-W bases of HCAL_mc design 10 C-W bases of ECAL_mc design PM control voltage is in the range 0÷3.8 V Medium voltage setting +96V Lab measurements: final dependence of output C-W HV on the control voltage
7
Irina Machikhiliyan, 23.02.2009 Lab measurements: comparison of designs HCAL_mcECAL_mc No difference between HCAL_mc and ECAL_mc was observed except for the first point
8
Irina Machikhiliyan, 23.02.2009 Lab measurements: final dependence of output C-W HV on the control voltage HCAL_mc+ ECAL_mc The final formula is: HV(V) = 6.3 + 421.4*Vctrl (V) For Vctrl ~ 3.5V medium voltage setting must be +90V +80V is not enough for “cosmics”
9
Irina Machikhiliyan, 23.02.2009 Lab measurements: reproducibility of output HV over different C-W In the ECAL operating range (~1 ÷ 2V of Vctrl): < 0.5% in HV or <3.2% in gain Contribution from HV-box (r.m.s. of Vctrl): < 0.36% in Vctrl or < 2.3% in gain In the ECAL operating range: < 1.6% in HV or <10.2% in gain These numbers define the precision of the calibration which can be achieved by “hardware” methods α (HAMAMATSU) r.m.s., VoltsMax spread, Volts
10
Further plans Irina Machikhiliyan, 23.02.2009 This / next week: installation of PM/C-W on A- side; Until mid. of March: A-side PM/C-W commissioning; Starting from second half of March: (a)In the lab: modification of spare C-W + repair; (b)On ECAL detector: calibration of PM gain by photo-statistics; adjustment of LED intensities; etc;
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.