Wednesday, September 11, 2019 2:30pm ET

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Agenda

Presentation slides Plots with no field

1. Double-check
   • engineers have envelopes, right?
2. Task tracker
3. Overall timeline for work
   • He/vac - then vacuum or helium vessel design can proceed
   • choose segmented vs. merged DS torus
   • collimators
   • beamline
   • windows
     • vacuum to He then He to air
     • OR - target vac to coil vac and vac to air
   • shielding
     • 2-bounce shielding
     • lintels
     • collars
4. Status of He vs Vac decision - Pugh matrix
   • He risk to PMTs
   • fighting backgrounds (from beampipe and He)
   • cost savings?
5. Collaboration meeting
   • plan for 1-1.5 hours (do we need more?)
   • who should speak? about what?

Minutes

Attendance: Jim, Ernie, Ruben, Probir, Robin, Sandesh, Chandan, Juliette, Dave

1. update to beampipe simulations
   • thinner material
     • Be promising - tubes have been made of Be
     • Al can't be made thin enough
     • C-C composite (too expensive?)
     • some plastic (need to be thick, outgasses, embrittlement)
   • biggest gain is with stray field shielding
     • mumetal shielding
     • solenoid to focus?
   • would beampipe need to be cooled? (power deposition in beampipe/shielding)
   • What vacuum is needed in vacuum case? 10^-4 to 10^-3 Torr?
     • window at scattering chamber?
     • differential pumping - what is needed along beamline in Hall - 10^-7 Torr?
2. Task Tracker
   • many things are not needed until CD2
   • assimilation of MIT work has been done
3. Update from engineers
   • coil downselect has not be done, but work is ongoing to make realistic comparisons
   • no new collimator work
   • beampipe design
   • FMEA
     • risk areas identified
     • need to score and work into matrix
   • updating drawings of coils/collimators for budgetary quotes for ICR
4. collaboration meeting talks
   • Physics talk
   • Engineering talk
   • What would benefit the collaboration most to present?
5. CDR - when will it be done?
6. Independent Cost Review (ICR) still mid-November
7. next meeting
   • score the He/vac Pugh matrix

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