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Agenda:

Agenda details for the G0 project's accelerator planning meeting with proposed beam specifications, accelerator configuration, source setup, engineering and software issues. Highlights scheduling and beam delivery estimates for upcoming project phases.

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Agenda:

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  1. G0 Accelerator Planning Meeting (11/1/05) Agenda: 1. Introduction & Proposed Beam Specifications (Grames/Pitt/Suleiman - 15 min)2. Proposed Accelerator Configuration [non-parity quality concerns] (Freyberger- 10 min)3. Polarized Source Setup [parity quality concerns] (Poelker/Suleiman - 10 min)4. Injector Matching [parity quality concerns] (Chao - 10 min)5. Engineering Issues (Merz/Lauze - 10 min)6. Software Issues (Bickley/Roblin- 10 min)

  2. What is new for backward angle? • 499 MHz vs. 32 MHz • 80 uA (100 uA) vs. 40 uA • Lower energy 687 MeV & 360 MeV (vs. 3 GeV) • Superlattice (85%) vs. Strained (75%) photocathodes • Ti:Sap & Fiber laser options • PQB specs reduced ~2x <-> Asymmetries larger ~10x • PQB dominated by source setup and injector matching • G0 spectrometer reversed

  3. Scheduling (intended accelerator schedule, but not yet firm) • Pre G0 Run • Accelerator down January-February 5 • G0 laser table setup • G0 injector matching setup • CASA G0 1-pass G0 setup • Hall B, then Hall A (using Hall C laser) run period 2/6-3/13 • Hall C nominally down until 3/14 • Best estimate for early beam delivery for checkout 3/1 • First Run Period (687 MeV, 1 pass, high Q2 measurement) • G0 accelerator commissioning 3/15 & 3/16 • G0 physics commissioning 3/17-4/2 (3 polarized expt’s) • G0 physics production run 4/7-5/1 (2 & 3 polarized expt’s) • Second Run Period (360 MeV, 1 pass, low Q2 measurement) • ~2 weeks later, start w/ ~2 days accelerator commissioning • Special accelerator setup, G0 run only 5/16-8/1 • Third (and final) Run Period (687 MeV, 1 pass, high Q2 measurement) • Begin ~9/22-12/22 (3 experiments)

  4. Parity Quality Beam Specs • Dispersion at 3C12 35 mm/% and <1 mm/% at target. • Standard deviation of difference between adjacent samples (each 1/30th) • E.G, number of pairs in run, N = 15 per sec * 3600 sec/hr * 700 hr = 37.8 Msamples, and 20 mm/Sqrt(N) ~ 3 nm

  5. G0 Diagnostics Girder

  6. G0 Halo Girder

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