Difference between revisions of "Π polarizability Meeting Jan 28, 2021"
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== Minutes == | == Minutes == | ||
− | '' Attending: Richard, Beni, Hovanes, Rory, Elton, Ilya | + | '' Attending: Richard, Beni, Hovanes, Rory, Elton, Ilya, James McTyre |
− | + | ||
# Previous CPP meeting: [[π polarizability Meeting Jan 27, 2021|Jan 27, 2021]] | # Previous CPP meeting: [[π polarizability Meeting Jan 27, 2021|Jan 27, 2021]] | ||
Line 59: | Line 58: | ||
# [[CPP and NPP Readiness Review]] | # [[CPP and NPP Readiness Review]] | ||
# [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=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) | # [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4882 CPP Configuration] (Elton) | ||
# Discussion (All) | # 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. | ||
+ | ## Elton will reconvene the group in March to check progress. |
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 -->):
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- http://jlab.bluejeans.com (You should only need to do this once)
- Meeting ID: 949 429 419
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Action Items
Tentative Agenda
- Previous CPP meeting: Jan 27, 2021
- Announcements
- CPP and NPP Readiness Review
- Microscope move to 6 GeV (Richard)
- CPP Configuration (Elton)
- Discussion (All)
Minutes
Attending: Richard, Beni, Hovanes, Rory, Elton, Ilya, James McTyre
- Previous CPP meeting: Jan 27, 2021
- Announcements
- CPP and NPP Readiness Review
- 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.
- Review of concepts (Richard)
- 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.
- Elton will reconvene the group in March to check progress.