Meeting 4 December 2018

ACTION ITEMS

(Jixie/Dustin/Donal) Address the comments on compatibilty with polarized target as requested in TAC and in Review Report from Aug 2018, e.g. estimate relative uncertainty of target polarization due to

(Jixie) radiation damage caused by electron-positron pair production and target rotation
(Dustin) Target rotation (mechanical and local damage) - review the reports by JLab and by Chris Keith and make additions and/or modifications in CPS document as needed

(David H.) Overall editing to address report comment that narrative doesn't flow smoothly and errors in the figure captions

(Bogdan/Rolf/Tanja/...) Start more detailed draft of NIM article based on David's outline

(Tanja with Dustin/Donal/Gabriel/Igor) Create first draft of an executive summary for a possible NSF Mid-Scale Research Instrumentation proposal

SUMMARY OF THE DISCUSSION

CPS DOCUMENT REV8

DONE field quality of polarized target - see edits in section III (Bogdan/Rolf)
DONE preliminary tuning of shielding - see section VI, e.g. Fig 25 and new text near
DONE cost analysis VI.F (Bogdan/Rolf)
DONE added phrasing about activation dose near target after 100 hour run - see figure captions in section V, e.g. Fig 23 (Tanja/Rolf)
Jixie working on FLUKA simulations on radiation damage estimates - results expected in next two weeks
Discussion about uncertainty due to target rotation and local radiation damage

if ignore radiation damage, then independent of e-beam - all mechanical motion/shock
local radiation damage - examine area of overlap of volume exposed to beam and NMR, if total overlap, then know polarization from NMR
practical consideration of how to build coil in relation to target rotation - more loops then smaller signal to noise - test setup in progress

POSSIBLE PUBLICATION IN NIM

Start with an outline of sections and then fill in with material from CPS document

Aiming for instrumentation paper, so not all pieces of current technical document, e.g. regarding the science, may be needed

Aim for putting together an initial draft by 2019 Hall A/C Winter meeting and solicit feedback

CPS CONSTRUCTION

There are two classifications depending on funds requested (RI-1 is $6 million to below $20 million) and two categories within: 1) Implementation (e.g., procurement, assembly, construction, commissioning) and 2) Design (e.g., preparations for future mid-scale and larger scale infrastructure. Compared to regular proposals, a larger emphasis is placed on scientific justification, research community priority, broader impacts, and project execution plan.

Preliminary proposals are due on 19 February 2019. Full proposals are due 20 May and by invitation only.

Compact Photon Source project would likely be RI-1/Implementation. Favorable points include that CPS offers access to unique science that cannot be done otherwise, is basically ready to go, and has community support. Some brainstorming notes:

Exclusive photoproduction with very small cross section, c.f. 12 GeV program initially (rare processes) - isolate very small signal to really understand structure
novel technology, gain in science, other applications
K_Long also aimed at rare processes, where CPS has huge benefit - may appear as other application in proposal as not yet approved by PAC
Include: CPS and polarized target
Highest priority: write an executive summary draft - unique science summarized in an easily understandable way for people outside NP. Aim to have a first draft within two weeks

NEXT MEETING: TUESDAY 8 JANUARY 2019 AT 3PM (EST)

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