CDC gain calibrations
From GlueXWiki
Early runs 10391-10913
- fadc thresholds were high and for runs with high atmospheric pressure the minimum ionizing peak in pulse amplitude was partly or mostly below threshold
- Chose straws 501-510 as these had high gain and their MIP was visible in most runs, found the scaling factor to match their MPV for the run of interest to run 11059, scaled the individual gains for run 11059 to give gains for the run of interest. Chose run 11059 as it was the next run after the thresholds had been adjusted.
Disconnected straws: 709, 2384, runs 10331 on.
Other missing straws: straw 3150 runs 10455-11059 straw 3151 runs 10331-11059 straws 21-25, 62-67, 110-116, 164-169 (HVB A5) runs 10392-10399 straws 2392-2399 runs 10455-10464 (HVB I8 and another) straws 2575-2582 runs 10455-10464 straws 2760-2767 runs 10455-10464 straws 2957-2964 runs 10455-10464 straws 3157-3164 runs 10455-10464 straws 3366-3373 runs 10455-10464 straw 2384-2391 run 10518 (not approved, but interesting for the low pressure) straw 2567-2574 run 10518 straw 2751-2759 run 10518 straw 2950-2956 run 10518 straw 3149-3156 run 10518 straw 3358-3365 run 10518 one straw from row 23 missing in 10573 straw 2873 missing in 011059 straw 2964 missing in 011059 straw 3372 missing in 011059
Low gain straws:
straw 244 runs 10331-11059 straw 1391 runs 10391- straw 2977 runs 10331-11059 straw 3178 runs 10331-11059 straw 3117 no amplitudes above 488 run 010562 straw 3155 no amplitudes above 490 run 010562 straw 3240 no amplitudes above 490 run 010562 straw 3248 no amplitudes above 486 run 010562 Low-gain HVB group 3064-3070 Low-gain HVB group 3270-3277 Low-gain HVB group 3479-3486
run 10703 - occupancy plot suggests that HVB A6 has low efficiency, the MIP is below threshold but the preamp saturation peak is not visible, so the preamp is probably ok but the gain is low. Check the HV. A6 includes straws 21-25.
[ https://halldweb.jlab.org/work/halld2/data_monitoring/RunPeriod-2016-02/mon_ver03/Run010703/CDC_occupancy.png occupancy plot ]
