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
  
 
=== Miscellaneous ===
 
=== Miscellaneous ===
Line 66: Line 68:
  
 
=== SHMS ===
 
=== SHMS ===
 +
 +
==== Analysis ====
 +
 +
* 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
  
 
==== GEM ====
 
==== GEM ====
Line 79: Line 87:
 
==== 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
  
 
==== Aerogel Cerenkov ====
 
==== Aerogel Cerenkov ====

Revision as of 12:05, 8 November 2017

Meeting Information

  • Location CC L210A, 11 am
  • DocDB

Blue Jeans Connection Information

  1. Enter Meeting ID: 895800575
  2. Press #

Agenda

  1. Commissioning plan updates from detector systems
  2. Status update from detector owners, calibrations, efficiencies, etc.
    1. Simulation update for the HGC
  3. Review systems owners and update information
  4. 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

Miscellaneous

Beam Line

Trigger/DAQ

HMS

6 GeV Drift Chambers

12 GeV Drift Chambers

Hodoscopes

Aerogel

Heavy Gas Cherenkov

Shower

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

GEM

Noble Gas Cherenkov

Drift Chambers

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

Aerogel Cerenkov

Shower/Pre-shower

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