Minutes - X .gt. 1 Minutes
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- Meeting Place: Virtual - Bluejeans
- Meeting Time: Friday, 2:30 EST
- Meeting Link: Refer to the weekly reminder email or calendar event for connection information.
Meeting Minutes
- Friday September 3rd, 2021
Current Tasks
Determine rate-dependent effects
- Probably want a thick carbon target to do this study. - Study boiling analysis on thin and thick carbon target. - May be able to get a different target with similar rates (~1.5% carbon too thin) - No such information available for 2018 running. - No thick carbon target on PionLT ladder. Need to have good communication with Dave M. - Is the deadtime of FADC250 the same the 100ns gate width problem with Cherenkov noisy tube?
Revisit boiling analysis Dataset from Dave Mack analysis (fall 2018)
- Dave noticed T5 was used to PID off of after the down in 2018 instead of T1. Review ELOGs - ELOG 108
Trigger discussion:
- Only use one trigger type at a time to simplify things. - Look into John's adaptable trigger? Take an electron trigger and only take 3/4 when EL-REAL isn't firing. - Need to talk to Brad about this.
EX) EL-REAL and then take 3/4 vetoed by EL-REAL If want unbiased take electron + ps + ps_factor (Accomplished now by Brad adjusting timing of triggers such that EL-REAL always comes first. That way triggers can be aligned.
Diagnostic histograms:
- Histograms aimed at pi, e, etc… - Diagnostics for EDT, pion pre-scaling, EDTM pre-scaling, etc… - Extra scalars and auto-analysis, e.g. of pi/e - Boiling - thin and thick carbon (low rates - BCM offset, high rates - rate dependence). Relatively low pi/e? NEED THICK CARBON!!!! Modest xsec - “pion” trigger as 3/4 VETOED by “real” trigger (if fixed real trigger?) —> exclusive, lower rate (easier to ‘prescale’). EL + PION*PS —> all. - Need high-p optics sled, elastic scan, sieve. [dp recon AND angle, so need sieve AND elastic] - 2018 - one trigger type at a time [EDT trigger generates fake “real” triggers] - 2021: ? Some separate 3/4 runs PLUS some prescaled? - right now: adjust timing to make elreal come first
Meeting Minutes
- Friday September 17th, 2021
Current Tasks
Casey showed plots on tracking with new algorithm.
- Adjust pruning cuts to enhance good track selection. - Work on Hodo starttime plots for hcana-april2020 update - Work on DNP meeting slides - Remind everyone what the contamination was in 2019 data in kinematically forbidden regions. - Get Ryan a computer account and start him working on rates for 2021 - Fixed minor bug in 4.0 GeV/c hallc_replay_XEM. Comment on L45 of standard.database - Adding plots of thresholds to online GUI. Dave will be getting me the branches / etc to plot. - The plots of thresholds will be used to check the discriminator logic for good PID selection (2018, the thresholds were too loo in the cherenkov, so they didn't do much.) - Get current for 2018 runs for Nadia
Cherenkov for 2021
- Burcu presented the preliminary results for the pion contamination study with the 21 deg EMC data (carbon and LD2 targets only). - Pre-shower cut in addition to the Cerenkov cut needs to be used for the pion sample selection, otherwise still some electrons in the sample. - The reasoning behind the choice of requiring ELLO instead of ELHI for the ELREAL trigger to proceed was explained by Dave G (using a narrow software cut on the pre-shower (< 0.05) and requiring ELHI leaves us with a very small window for the energy deposition in the pre-shower and possibly biasing the pion sample.) - Burcu will repeat the same study with requiring ELLO. - 8 degree runs have electrons in pion sample, so hard to use. Dave G. suggested looking at the parameters from the EMC fits of pion contamination and applying to SRC hopefully. - Look into the gas Pion_LT is using for 8.0 GeV/c running. Getting 7 p.e. and it'll only get worse for us at higher momenta.