[Halla_min] Minutes of Hall A Group Meeting: August 29, 2017

[Stephanie Tysor]

Minutes of Hall A Group Meeting: August 29, 2017 

1. Thia Keppel 
a. Senior Staff 
i. NPES schedule should be approved & on the web & available to users all in ~ a week 
ii. 6 GeV DVCS (gluon) accepted by Nature Communications 
iii. Tritium training to be available online around 10-1-17. Need to have this for shifts! 
iv. Shipping for overseas, please work with Janet Prater 
1. Customs can be waived or ~ 2k, depending on how arranged 
b. Hall business 
i. Please get travel projections in to Stephanie! 

2. Robin Wines 
a .SBS 
i. Continue on HCal engineering checks 
ii. ECal & CDet support design 
iii. Ordered shielded beamline assembly parts 
iv. Continue on polarized 3He target 
v. Received budgetary estimates for floor plates 
b. PREX/CREX 
i. Work order placed for machine shop to fabricate collimator parts 
ii. Tungsten due in this week 
iii. Septum coil finally out for bid 
c. APEX 
i. Corrector coil bids due this week 

3. Jessie Butler 
a. Continue looking over the cryogenic and vacuum systems to look for ways to improve on hea load to ESR 
b. DVCS crystals surveyed & moved out of hall & in to ESB for storage 
c. Finished leak checking & repairing leaks in the exit beamline vacuum 
d. Received & tested the motors to finish rebuilding the final 2 vacuum pumps 
i. Motors are good – planning on installing the motors by middle of the week 
e. Prepping for swapping out the LQ1 power supply with the new one 
f. Moved R-HRS into 12.5 degrees & built guard for RQ1 
g. Both Q1 guards have been modified to support HRS being at 12.5 degrees 
h. Continue to support Target Group work in hall 

4. Jack Segal 
a. Filter replacement in HRS racks 
b. Replaced all NIM crate cooling fan filters 
c. SBS GEM electronics 
i. Request to evaluate mechanical attachment of long backplane on GEM detectors to be used in GMN experiment 
backtracking plane 
ii. Problem encountered is too much flexing of card reinforcement “rib” that utilizes existing screw hole pattern 
iii. Material ordered for fabrication of prototype part for evaluation 
iv. Identified some leakage current affecting the RQ2 quench detection circuit 

-- 
Stephanie Tysor 
Hall A Administrative Assistant 
Thomas Jefferson National Accelerator Facility 
(office)757-269-6005 (fax)757-269-5235 
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