Dutch → Big Brother target change

Plan for Dutch → Big Brother target change

Hall Status: Controlled Access, if possible. Red fonts show when the Hall will be in Laser Controlled Access.

Tentative plan

A) Monday 8:30am: Polarized beam is terminated. Full Survey of the Hall (RadCon). Hall stays in Controlled Access.

B) 9:20 Put Hall in Laser Controlled Access: Jian-Ping

C) 9:30:Open target enclosure (4 plastic panels): 3 or 4 Hall C Techs+ RadCon+Jian-Ping Meanwhile, Bill starts working on Kepco power supply swap/fix/work. This needs to be finish before step E.

D) 10:30 Replace EPR fiber bundle: Junhao + Jian-Ping + RadCon

E) 11:30 EPR calibration in both longitudinal and transverse

F) 13:20 Laser off, fibers LO/TO, hall out of laser control access: Jian-ping

G) 13:30 Remove Dutch and the target ladder: Arun, Todd, 1 target student + Radcon

H) 15:20 Put Hall in Laser Controlled Access: Jian-Ping

J) 15:30 Laser polarization measurement: Junhao,Todd (+Radcon?)

K) 17:20 Laser off, LO/TO fibers, Out of Laser Controlled Access: Jian-Ping

L) 17:30 Install Big Brother: Arun, Todd +1 +RadCon

M) 18:30 Install target ladder/Ref. Cell connection: Arun, Todd +1, (+RadCon?)

N) 19:30 Set-up RTDs and other connections: Arun, Bill, (+RadCon?)

O) 20:30 Alignment check: Arun +1 (+RadCon?)

P) 21:20 Put Hall in Laser Controlled Access: Jian-Ping

Q) 21:30 Laser alignment/spot: Jian-Ping+1+ Radcon

R) Tuesday 00:30 am Out of Laser Controlled Access: Jian-Ping

S) Backout checklist: Jian-ping

T) Pumping up and testings: TBD

U) Tuesday 7:00am put back the target enclosures: 3 Techs+ RadCon.

V) 11:00am Close Hall (backout checklist) for data taking on ref. cell: TBD

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In parallel to the above, other tasks need to be done Monday. They should be organized when enough access keys are available (who is in the Hall will be written in the counting room white board).

a) Rotation stage/camera: Ethan (Jack), Brad

b) Kepco power supply swap/fix/work: Bill. To be done before item E.

c) Replace the 2 old flowmeters for the nitrogen cooling jets lines with 2 new ones: Andy (Jack)

List of relevant persons with contact email

• RadCon:
  • Keith Welch <welch@jlab.org>,
  • David Hamlette <hamlette@jlab.org>;
• Hall leadership:
  • Cynthia (Thia) Keppel <keppel@jlab.org>;
  • Stephen Wood <saw@jlab.org>;
• Work Coordinator: Walter Kellner <kellner@jlab.org>;
• Run Coordinator: Alexandre Deur <deurpam@jlab.org>
• PDL: Greg Smith <smithg@jlab.org>;
• Experiment/Target leadership:
  • Jian-Ping Chen <jpchen@jlab.org>;
  • Xiaochao Zheng <xiaochao@jlab.org>;
  • Averett, Todd D <tdaver@wm.edu>;
  • Brad Sawatzky <brads@jlab.org>;
• Engineers/Technical
  • Jack Segal <segal@jlab.org>;
  • Steven Lassiter <lassiter@jlab.org>;
  • Ethan Becker <ethanb@jlab.org>;
  • Andrew Kenyon <kenyon@jlab.org>;
• Target experts
  • Arun Tadepalli <arunts@jlab.org>;
  • William Henry <wmhenry@jlab.org>;
  • Melanie Rehfuss <mrehfuss@jlab.org>;
  • Mingyu Chen <mingyu@jlab.org>;
  • Junhao Chen <jhchen@jlab.org>;
  • Murchhana Roy <mroy@jlab.org>.