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Meeting Information

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.