Difference between revisions of "Π polarizability Meeting Jan 8, 2020"

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''Attending: Elton, Mark, Andrew, Ilya
  
 
# Previous meeting: [[&pi; polarizability Meeting Dec 18, 2019|Dec 18, 2019]]
 
# Previous meeting: [[&pi; polarizability Meeting Dec 18, 2019|Dec 18, 2019]]
 
# Announcements
 
# Announcements
 +
#* Tim has setup the first meeting to discuss the CPP geometry for next week Wed Jan 15 at 2 pm in TED 2504
 
# Update on Run
 
# Update on Run
 
# Data Analysis - Andrew  
 
# Data Analysis - Andrew  
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# MWPC status - Rory
+
#*[[Media:AndrewSchick ElectronPion TMVA Jan 8 2020.pdf | e-/pi- TMVA]]
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# [https://halldweb.jlab.org/DocDB/0041/004180/006/CPP_update_oct19.pdf Reference to Collaboration October Meeting]
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#* Andrew presented his preliminary TMVA analysis
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# Discussion of beam test (Elton, Dave, Ilya, Tim and Scot)
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#* We realized that the TOF calibration may not be correct. It will be updated before further studies for next week
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## Preliminary Analysis of TOF rates with new aperture (18x18 cm2) (Ilya)
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#* The e/p ratio provides considerable e/pi separation on its own.
−
##* These are simulated TOF trigger rate using random trigger
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# Discussion of beam test
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##* Configuration consisted of 47 um diamond radiator (coherent peak at ~ 7 GeV), 30 cm H GlueX target (3.3% r.l.), 4 DIRC bars installed.
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#* [https://userweb.jlab.org/~ilarin/cpp/rates_70984.pdf Rates 70984] (Ilya) Presented TOF rates from test in December
−
##* Trigger rate ~30 kHz at 20 nA, ~50 kHz at 30 nA and ~80 kHz at 50 nA.
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#* [https://userweb.jlab.org/~ilarin/cpp/tof_occ_ratio.jpeg] TOF occupancy for horizontal and vertical scintillators and ratio
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##* Notes: 1 TOF FADC not operational, which reduces the measured rates somewhat
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#* Mark: Could be that the center 4 channels are ones that Beni identified as problematic at this morning's RC meeting
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##* This trigger should be able to be implemented with current firmware but requires a different configuration file.
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#* Another explanation is that the horizontal counters are unshielded by the horizontal gap on the beamline between the two DIRC bars.  
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## Discussion of proposed beam test
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#* We need to check with Beni about which channels are problematic and whether this problem is new or existed in December.
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##* Previous estimate of TOF trigger rate was 270 kHz before TOF modification.
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#* [[Media:CPP update jan20.pdf | Slides on DIRC Geometry]] (Elton)
−
##* If Ilya's new rates are correct, there has been a reduction of a factor of about 270/30 ~ 9 due to the TOF new aperture and insertion of DIRC bars.
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#* Collected some information  on the DIRC, but more details are needed, especially gap along the beamline.
−
##* Ilya is checking his calculations. If confirmed, it is proposed to measure rates without the DIRC bars.
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−
##* Removal (insertion) of DIRC bars is a shift. Tim believes this can be done with the magnetic field on.
+
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##* So this test could be accomplished with a setup shift, one data shift, and one restore shift.
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## Hardware Preparations
+
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##* It was decided to go ahead and enlarge the hole in the existing lead sheets in case they might be needed. They will be enlarged to 17.5x17.5 cm2 to match the TOF 18x18 cm2 aperture.
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## CPP Design
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##* Tim will setup a design meeting in Jan to review specifications for the CPP muon detector.
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−
# Simulation Tasks:
+
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#* Geometry in HDDS
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#* MWPC hits in hdgeant4
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#* Absorber thicknesses study
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#* Target position study
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#* Trigger acceptance study
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−
#* other?
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# Other business
 
# Other business
 
# Next meeting
 
# Next meeting

Latest revision as of 13:16, 8 January 2020

Meeting Info.

Meeting Time And Location

10:00 EST (JLab time)

CC L207

Connecting

You can connect using BlueJeans Video conferencing (ID: 949 429 419). (Click "Expand" to the right for details -->):

  1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:

  2. Meeting ID: 949 429 419
    • (you may need to type this in, depending how you connect)

  3. If connecting via Web Browser: click this link (no passcode is needed):

  4. If connecting via iOS or Android App:
    • Use your JLab e-mail address to log in and then enter the meeting ID given above to join the meeting

  5. If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"

  6. If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above



Attending: Elton, Mark, Andrew, Ilya

  1. Previous meeting: Dec 18, 2019
  2. Announcements
    • Tim has setup the first meeting to discuss the CPP geometry for next week Wed Jan 15 at 2 pm in TED 2504
  3. Update on Run
  4. Data Analysis - Andrew
    • e-/pi- TMVA
    • Andrew presented his preliminary TMVA analysis
    • We realized that the TOF calibration may not be correct. It will be updated before further studies for next week
    • The e/p ratio provides considerable e/pi separation on its own.
  5. Discussion of beam test
    • Rates 70984 (Ilya) Presented TOF rates from test in December
    • [1] TOF occupancy for horizontal and vertical scintillators and ratio
    • Mark: Could be that the center 4 channels are ones that Beni identified as problematic at this morning's RC meeting
    • Another explanation is that the horizontal counters are unshielded by the horizontal gap on the beamline between the two DIRC bars.
    • We need to check with Beni about which channels are problematic and whether this problem is new or existed in December.
    • Slides on DIRC Geometry (Elton)
    • Collected some information on the DIRC, but more details are needed, especially gap along the beamline.
  6. Other business
  7. Next meeting

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