Π polarizability Meeting Apr 14, 2021
From GlueXWiki
Meeting Time And Location
09:00 EST (JLab time) Weekly Meeting
REMOTE during Covid-19
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Action Items
Preliminary Agenda
- Previous CPP meeting: Apr 7, 2021
- Announcements
- Action Items
- CPP and NPP Readiness Review
- Responses to the ERR. This link points to the draft response to the ERR.
- MWPCs (fabrication, testing) (Rory)
- Trigger rates (beam test analysis, expectation with target pulled back) (Ilya)
- Hdgeant4 (initial setup and plan for running simulations) (Mark and Beni + moral support from David)
- Analysis (low level reconstruction, monitoring) (David to write paragraph)
- CDC Coverage of electronics by one crate (Beni)
- MWPC gas system
- Tracking / extrapolation to MWPCs (Simon)
- Higher level analysis (e.g. PID, efficiencies and reconstruction) (Rory)
- Rates in MWPCs (Ilya)
- Microscope move (Elton)
- Meeting with Richard and Jim on April 12 @ 1:30 pm.
- By straddling the vacuum chamber support, we can move the microscope downstream by 280 cm.
- Timeline to publication
- Table of responsibilities
- GlueX Data Analysis
- CPP Software
- PID + AI
- Other business
- Next meeting
Minutes
Attending:Elton, Albert, Andrew, Beni, Ilya, Mark, Rory
- Previous CPP meeting: Apr 14, 2021
- Announcements
- Action Items
- CPP and NPP Readiness Review
- Responses to the ERR. This link points to the draft response to the ERR.
- MWPCs (fabrication, testing) (Rory)
- Good progress. Two more sections more.
- Started stringing the 8th (last) MWPC last week, now that students are back on campus
- Elton: We should create single-page summary of MWPC, as was done for all previous GlueX detector systems. See GlueX-doc-2376
- Trigger rates (beam test analysis, expectation with target pulled back) (Ilya)
- Ilya presented new calculations showing that the rates increase by about 15% when the target is retracted from 65 cm (nominal GlueX) to 1 cm.
- He continues to run MC studying the target dependence for the signal.
- Hdgeant4 (initial setup and plan for running simulations) (Beni)
- The orientation of the MWPC wire planes has been implemented. Bugs in the code have been fixed related to incorrect units (mm vs cm). Pull request should fix them.
- The geometry xml files have been created, but not yet loaded into ccdb. The program hangs, but Richard has been notified.
- Mark and Beni will take a look at the program output.
- Analysis (low level reconstruction, monitoring)
- Text has been added to the response to address the committee's concerns
- CDC Coverage of electronics by one crate (Beni)
- MWPC gas system
- A new gas mixing system will be some effort.
- Buying premixed gas might be more straightforward, but carries schedule risk and direct cost.
- Rory estimates that we would consume 1 bottle every 2 days. Experience shows that there is several week delivery time.
- Tracking / extrapolation to MWPCs (Simon)
- No report. Needs working MC.
- Higher level analysis (e.g. PID, efficiencies and reconstruction) (Rory)
- Text has been added to the response to address the committee's concerns
- Rates in MWPCs (Ilya)
- Estimates can be taken from the work to study the effect of joints in the iron casing for the Pb. The estimate for beam leakage is about 1 KHz.
- Ilya will collect information into one place.
- Microscope move (Elton)
- Meeting with Richard and Jim on April 12 @ 1:30 pm.
- By straddling the vacuum chamber support, we can move the microscope downstream by 280 cm.
- Timeline to publication
- Updated version was reviewed. The main change was to increase the time for the CPP publication by 1 quarter relative to NPP, since the goal of 1% on the CPP cross section is likely require more time than the 5% NPP measurement.
- Table of responsibilities
- Table revisited. Beni suggested adding a line for the testing in the EEL
- MWPCs (fabrication, testing) (Rory)
- GlueX Data Analysis (Andrew)
- Presented an update on the discrepancy (~4%) of elasticity between data and MC. The discrepancy increases with track momentum.
- Andrew will use his data to determine a non-linear correction, which could be used to correct the e+e- data.
- Ilya: Note that the FCAL response to electrons is slightly different than to photons at the percent level. It is still useful to determine the corrections for electrons (positrons).
- This correction will be presented at the next calorimeter meeting.
- CPP Software
- PID + AI
- Other business
- Next meeting