September 4, 2015 PID Upgrade

From GlueXWiki
Jump to: navigation, search

Meeting Information

GlueX PID Upgrade Meeting
Friday, September 4, 2015
11 am, EDT
For those people at Jefferson Lab, the meeting will be in room A110

Connection Using Bluejeans

  1. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 846453895.
  2. To join via a Web Browser, go to the page [1] https://bluejeans.com/846453895 .
  3. To join via phone, use one of the following numbers and the Conference ID: 846453895
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. More information on connecting to bluejeans is available.

Agenda

  1. Announcements
  2. Detector support structure requirements (All)
    • Do we need to require that the bars can be "easily" moved out of the active area of the detector for other experiments (eg. PrimeX)?
    • What additional cost and risk are implied by such a design?
  3. Additional design work to be completed with project funds? (All)
    • Main detector support structure
    • Shipping crate
    • Expansion volume:
      • Final design for focusing optics box
      • MaPMT/Electronics module structure and mounting on fused silica window
  4. Planning for October review (All)
    • TDR updates
    • Program Management
  5. Calibration with data (Christiano)
  6. AOB


Minutes

  1. Detector support structure requirements (All)
    • As we discussed last week it would be useful for the support structure to allow for the DIRC bars to be moved out of the active area of the detector without completely disassembling the detector
      • There are two possible possibilities for this:
        1. Move the upper bar box above the active area and the lower bar box below the active area
          • Requires 2 separate focusing optics box rather than one unified box).
        2. Move the whole support structure to the right of the beam (by crane or rolled)
          • Requires uncableing the detector
      • Since there are no strong reasons to require a single focusing box, we decided to change the default design to 2 separate optics boxes
      • We will pursue design 1. (above) and John will look into modifications to the support structure design
    • We also discussed if the water in the focusing box would be emptied during shutdowns and did not come to a conclusion on this
      • Eugene suggested we look into the change in pressure on the bar boxes with and without water in the volume and account for this in the design
  2. Additional design work to be completed with project funds? (All)
    • We didn't discuss this list in detail, but each of the groups are working on schedules/budgets that will include this design work.
  3. Planning for October review (All)
    • TDR: Sent to internal reviewers last week and asked for a response by 9/7). We will discuss the response at next weeks meeting.
    • Program Management: Justin is meeting with Patrizia to discuss this next Tuesday.
  4. Calibration with data (Christiano)
    • Christiano studied how well the alignment of the 3-segment mirror could be determined from a sample of pure pion tracks
    • Based on John's earlier simulations we need to know this angle to ~1 mrad, and with only 1000 tracks the alignment can be determined to 1-2 mrad
    • There should be plenty of tagged pions (eg. Ks -> pi+pi- decays) to determine this angle to the required precision with a small amount of beamtime
    • Christiano will continue working on this and a summary will go into the TDR