Tuesday, April 14, 2015 11:30am EST

Last meeting: Thursday, March 26, 2015 10:00am EST

Collimator working group meeting

Agenda

• Engineering
  • KK Intro. slides
  • Jason's summary
  • Supports
  • Water cooling
  • Remote adjustments
• Physics
  • power deposited sims
  • sensitivity sims

Minutes

Attending: Juliette, Jason, Ernie, Tyler, Seamus, KK, Jim

• Account extended at MIT, waiting for funds from JLAB
• KK's intro
  • Slide 4 - downstream of target beampipe needs to be designed
    • definitely metal seals throughout
    • top could maybe be rubber
  • Slide 5 - Collimator concept
    • collimator 3 catches lowest angle
    • power divided between 1 and 3
    • 5 does not exist, but other numbers are accurate
    • last green is new 5
  • Slide 6 - estimated power still old numbers
    • new numbers are pretty close
    • beampipe shown as designed in slide 14
  • Slide 7 - E158 Concept (won't work exactly)
    • micrometer controls to change orientation of collimator (x, y)
    • we have to support along radial direction in shadow of collimators
    • 1 and 3 have to be precisely placed
      • 1, 2 and 3, 4 could be single units but collimator 3 has slipped further upstream
      • 2, 4 need to be placed to within 1mm for the acceptance definition
      • 1, 3 have to be more stringent b/c of the difference in the power deposited (0.5 mm)
      • design for more power than estimated and also precision placement
  • Slides 8-14 2-bounce system
    • Need to block line of sight to detectors
    • slide 4 - encircle beampipe close to target
    • beam pipe to shield photons from edge of 1 and 2
    • 13 - shows how to block line of sight
    • 14 - realistic geometry
  • 15-18 - zoomed "beampipe shields" in hybrid and upstream regions
  • 15 bottom 3 mm of W works
  • 16, 17 - "beampipe shield" in upstream
  • 18 - "beampipe shield" in hybrid
  • high Z but non-magnetic (iron free) exact permeability? (Rembar)
• Moving forward
  • Questions:
    • How to support all and align (1, 3 in particular)
    • Materials (W, Cu) cooling vs. shielding vs. weight
    • water cooling leads that don't interfere with envelope
    • 2, 4 need 40 radiation lengths along z (20, 25 absolute minimum)
    • inner and outer radii for 1, 3 fixed by CAD (length along z, Moliere radius)
  • Engineers will provide some feedback
  • Physicists will run by CAD and check physics
• Next meeting will be Thursday, April 23rd at 2pm ET

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