Difference between revisions of "Wednesday, November 8, 2017"
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=== General === | === General === | ||
| − | + | * Mark discussed the [https://hallcweb.jlab.org/wiki/index.php/Fall_2017_Commissioning_Plan Fall 2017 commissioning plan] | |
| − | + | * He has been updating the commissioning plan | |
| − | + | * Minimum angle for SHMS during the fall run is 7.5 | |
| − | + | * Brad S. volunteered to post a run plan regarding the centering of the beam via. [https://hallcweb.jlab.org/wiki/index.php/Commissioning_Plan_2017#Center_beam_on_C-hole_target carbon hole studies] | |
| − | + | * Plans in terms of spectrometer settings and beam energies for the various commissioning tasks must be prepared for next weeks meeting | |
| − | + | * For all EPICS variables that folks desire they should check that they are currently present in the start and end of run in CODA | |
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=== SHMS === | === SHMS === | ||
| − | ==== | + | ==== Analysis ==== |
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| + | * Burcu showed [https://hallcweb.jlab.org/DocDB/0009/000922/001/SHMSacceptanceUpdate.pdf some slides] regarding the SHMS acceptance studies | ||
| + | * The aim is to compare the SHMS acceptance rates utilizing SAMC and KPP data | ||
| + | * In general the MC agree well with the KPP data | ||
==== Hodoscopes ==== | ==== Hodoscopes ==== | ||
| − | + | * Simona showed [https://hallcweb.jlab.org/DocDB/0009/000921/001/quartz_11817.pdf some slides] | |
| + | * She provided an update on the quartz plane | ||
| + | * All 16 bars are ready | ||
| + | * 8 bars have been tested | ||
| + | * The remaining 8 bars are currently being tested | ||
| + | * The frame came out of the SHMS detector stack | ||
| + | * Will be put back in the stack on Nov. 21 | ||
| + | * Pedestal look solid and are not drifting | ||
| + | * The pedestal subtracted ADC spectra look good | ||
| + | * Request was made for a defocused tune so that the bars could be arranged based on performance | ||
| + | * Help for removing things from the hall was advertised | ||
| + | * Cookies were 50 micron thin | ||
==== Heavy Gas Cherenkov ==== | ==== Heavy Gas Cherenkov ==== | ||
| − | + | * Ryan showed [https://hallcweb.jlab.org/DocDB/0009/000920/001/Slides.pdf some slides] | |
| − | + | * They are investigating reduction in observed in NPE’s during the KPP run | |
| − | + | * There are three main suspects | |
| − | + | * Data obtained from manufacturer clearly indicates that there is a wave length cutoff at 400 nm | |
| − | + | * The RTV is also a prime candidate based on recent simulations | |
| − | + | * Simulations indicate that the increase of NPE will be to modify the current optics | |
| − | + | * They have a strategy to remove the bottom two PMTs for the spring running | |
| + | * Post march running they will remove the other two PMTs | ||
| + | * Over summer will conduct complete tests of transparency for all 4 PMT’s | ||
| + | * Concern is reflections will occur if no optical coupling is present between the PMT and the window | ||
| + | * Air has not been modeled but could be done, Ryan will work on this, it was emphasized that this needs to be done | ||
| + | * Garth indicated to Simona that the RTV is 1-2 mm thick | ||
| + | * Bill arrives onsite within the next couple of weeks | ||
| + | * Simona still has material to make a cookie if they require to make a new one | ||
Latest revision as of 12:36, 8 November 2017
Meeting Information
- Location CC L210A, 11 am
- DocDB
Blue Jeans Connection Information
- https://bluejeans.com/895800575
- Just want to dial in on your phone?
- +1.408.740.7256 (US)
- +1.888.240.2560 (US Toll Free)
- +1.408.317.9253 (Alternate number)
- http://bluejeans.com/numbers
- Enter Meeting ID: 895800575
- Press #
Agenda
- Commissioning plan updates from detector systems
- Status update from detector owners, calibrations, efficiencies, etc.
- Simulation update for the HGC
- Review systems owners and update information
- Address system specific points of interest for the Fall 2017 run
Minutes
General
- Mark discussed the Fall 2017 commissioning plan
- He has been updating the commissioning plan
- Minimum angle for SHMS during the fall run is 7.5
- Brad S. volunteered to post a run plan regarding the centering of the beam via. carbon hole studies
- Plans in terms of spectrometer settings and beam energies for the various commissioning tasks must be prepared for next weeks meeting
- For all EPICS variables that folks desire they should check that they are currently present in the start and end of run in CODA
SHMS
Analysis
- Burcu showed some slides regarding the SHMS acceptance studies
- The aim is to compare the SHMS acceptance rates utilizing SAMC and KPP data
- In general the MC agree well with the KPP data
Hodoscopes
- Simona showed some slides
- She provided an update on the quartz plane
- All 16 bars are ready
- 8 bars have been tested
- The remaining 8 bars are currently being tested
- The frame came out of the SHMS detector stack
- Will be put back in the stack on Nov. 21
- Pedestal look solid and are not drifting
- The pedestal subtracted ADC spectra look good
- Request was made for a defocused tune so that the bars could be arranged based on performance
- Help for removing things from the hall was advertised
- Cookies were 50 micron thin
Heavy Gas Cherenkov
- Ryan showed some slides
- They are investigating reduction in observed in NPE’s during the KPP run
- There are three main suspects
- Data obtained from manufacturer clearly indicates that there is a wave length cutoff at 400 nm
- The RTV is also a prime candidate based on recent simulations
- Simulations indicate that the increase of NPE will be to modify the current optics
- They have a strategy to remove the bottom two PMTs for the spring running
- Post march running they will remove the other two PMTs
- Over summer will conduct complete tests of transparency for all 4 PMT’s
- Concern is reflections will occur if no optical coupling is present between the PMT and the window
- Air has not been modeled but could be done, Ryan will work on this, it was emphasized that this needs to be done
- Garth indicated to Simona that the RTV is 1-2 mm thick
- Bill arrives onsite within the next couple of weeks
- Simona still has material to make a cookie if they require to make a new one
