Difference between revisions of "Π polarizability Meeting Jan 28, 2021"

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(Tentative Agenda)
(Minutes)
 
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# Announcements
 
# Announcements
 
# [[CPP and NPP Readiness Review]]
 
# [[CPP and NPP Readiness Review]]
# Microscope move (Richard)
+
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4883 Microscope move to 6 GeV] (Richard)
 
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4882 CPP Configuration] (Elton)
 
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4882 CPP Configuration] (Elton)
 
# Discussion (All)
 
# Discussion (All)
  
 
== Minutes ==
 
== Minutes ==
'' Attending:
+
'' Attending: Richard, Beni, Hovanes, Rory, Elton, Ilya, James McTyre
 +
 
 +
# Previous CPP meeting: [[π polarizability Meeting Jan 27, 2021|Jan 27, 2021]]
 +
# Announcements
 +
# [[CPP and NPP Readiness Review]]
 +
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4883 Microscope move to 6 GeV] (Richard)
 +
## Review of concepts (Richard)
 +
##* Nice overview of how the microscope is adjusted. The angle of electrons crossing the focal plane (beta) is about 12 degrees at the nominal 9 GeV coherent peak. At 6 GeV, beta ~ 9.5-8.5.
 +
##* The change in angle is referred to as the "toe"
 +
##* 17 fiber bundles in groups of 6 fibers need to be adjusted. One bundle, called a "popsicle stick", consists of 6 fibers, but groups of 3 are offset along the electron trajectory.
 +
##* Three jig pieces need to be fabricated: a wedge to set the beta angle for the first fiber and two pieces that set the rails that hold the fibers
 +
##* The change in beta from 12 deg -> 9 deg results in the length of the microscope along the focal plane increasing by about 30%.
 +
## Mechanics (James McTyre)
 +
##* Files have been recovered, but final iterations need to be verified
 +
##* Design changes for the 6 GeV peak are needed
 +
##* Promised to complete changes by April and write down detailed alignment procedure.
 +
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4882 CPP Configuration] (Elton)
 +
# Discussion (All)
 +
#* Installing the hodoscope and microscope to cover the same region should be feasible
 +
#* James: the fan cooling electronics might create pressure on the hodoscope pmts and might need adjustments.
 +
#* Precise location of microscope.
 +
#* Richard: For GlueX, the microscope is positioned to cover the coherent peak + 15% margin
 +
#* Homework for CPP: Suggest margins and precise location of peak for the "6 GeV" position.
 +
# Next Meeting
 +
#* Elton will reconvene the group in March to check progress.

Latest revision as of 16:32, 29 January 2021

Meeting Time And Location

01:00 pm EST (JLab time) Weekly Meeting

REMOTE during Covid-19

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
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    • 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



Action Items

Tentative Agenda

  1. Previous CPP meeting: Jan 27, 2021
  2. Announcements
  3. CPP and NPP Readiness Review
  4. Microscope move to 6 GeV (Richard)
  5. CPP Configuration (Elton)
  6. Discussion (All)

Minutes

Attending: Richard, Beni, Hovanes, Rory, Elton, Ilya, James McTyre

  1. Previous CPP meeting: Jan 27, 2021
  2. Announcements
  3. CPP and NPP Readiness Review
  4. Microscope move to 6 GeV (Richard)
    1. Review of concepts (Richard)
      • Nice overview of how the microscope is adjusted. The angle of electrons crossing the focal plane (beta) is about 12 degrees at the nominal 9 GeV coherent peak. At 6 GeV, beta ~ 9.5-8.5.
      • The change in angle is referred to as the "toe"
      • 17 fiber bundles in groups of 6 fibers need to be adjusted. One bundle, called a "popsicle stick", consists of 6 fibers, but groups of 3 are offset along the electron trajectory.
      • Three jig pieces need to be fabricated: a wedge to set the beta angle for the first fiber and two pieces that set the rails that hold the fibers
      • The change in beta from 12 deg -> 9 deg results in the length of the microscope along the focal plane increasing by about 30%.
    2. Mechanics (James McTyre)
      • Files have been recovered, but final iterations need to be verified
      • Design changes for the 6 GeV peak are needed
      • Promised to complete changes by April and write down detailed alignment procedure.
  5. CPP Configuration (Elton)
  6. Discussion (All)
    • Installing the hodoscope and microscope to cover the same region should be feasible
    • James: the fan cooling electronics might create pressure on the hodoscope pmts and might need adjustments.
    • Precise location of microscope.
    • Richard: For GlueX, the microscope is positioned to cover the coherent peak + 15% margin
    • Homework for CPP: Suggest margins and precise location of peak for the "6 GeV" position.
  7. Next Meeting
    • Elton will reconvene the group in March to check progress.