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HCAL status and calibration

HCAL status and calibration. HCAL status survey 07.09.2009. A quick method to check the LEDs, PM/CWs and integrators : enable LEDTSB pulser (2 kHz continuous LED flashing) look at the PM currents. All the LEDs, PM/CWs and integrators OK. +. nA. The CAT reflection test:

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HCAL status and calibration

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  1. HCAL status and calibration Yu. Guz 08/09/2009

  2. HCAL status survey 07.09.2009 • A quick method to check the LEDs, PM/CWs and integrators : • enable LEDTSB pulser (2 kHz continuous LED flashing) • look at the PM currents All the LEDs, PM/CWs and integrators OK + nA • The CAT reflection test: • FEB side: ATI connector problem crate 23 slot 11 in 28 (I_15_02) (fixed) • no problem found at the PM side gain=100k, nominal LED intensities = HCAL low level HW is operational Yu. Guz 08/09/2009

  3. HCAL 137Cs calibration Four 137Cs runs since June: 19 Jul, 07 Aug, 14 Aug, 04 Sep Several source passages at different HVs in runs of 14 Aug and 04 Sep, in order to renewPM regulation curves New calibration set (PHYSICS and STDB HVs and PM regulation curves) is ready, will be available in Db soon Yu. Guz 08/09/2009

  4. PM stability, 13.02-04.09.09 13.02-04.09.09 Slow variation of PM gains: since 13.02, 96 PMs out of 1488 changed by (10…40)% The PM gain drift is expected to continue  137Cs calibration to be refreshed on needs 96 cells Yu. Guz 08/09/2009 replacements

  5. Spare slides Yu. Guz 08/09/2009

  6. PM gain variations, 6 months vs 1.5 months Yu. Guz 08/09/2009

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