SANE Short Term Run Plan –Wed. 2/11 eve – Thur. 2/12 owl/day/eve

RUN PLAN (SAVE previous run plans in the Run Plans binder)

Wed. 2/11 eve to Thur. 2/12 eve. Opportunistic accesses: when switching targets, during anneals (check with the target experts) or to delay or move up anneal times to avoid annealing between midnight and 6:00 AM. Keep < 30 min. long if possible.

BEAM (for production runs):

Current : 95 nA

check that the SR is ON and configured with New Settings for 5.9 GeV Beam as explained in hclog entry 175618 (20 mm dia.) spiral: 1.37 V; circles 1 & 2: 1.28 V

fast raster 1 x 1 mm, 3H00A x=-0. y=-0.66 3H00B x=-0.5 y=-0.3

beam at x = -0., y = -0.66 mm on BPM 3H00A;

x = -0.5, y = -0.3 mm on BPM 3H00B (per hclog 175661)

Enter all required variables in the on-line Run Sheets, including the target polarization at the beginning and end of each run

DATA:

HMS: should be set at central momentum to 3.1 GeV/c, 15.4, electrons (Q2 = 1.3 GeV2, W = 2.2 GeV) for packing fraction.

Take data with the BOTTOM target with NEGATIVE polarization. Watch the polarization rate of increase. Wait up to 30 min. from the start of polarizing:

If it takes (or took) more than 30 min to get to 50%, it probably is over annealed. Ask for 110 nA and start taking data, continue for up to 4 h total time.

If the polarization gets above 60% in  30 min, ask for 95 nA, take ~1 h long runs. Continue with 1 h runs until the polarization is down to 60% or 4 h total time, whichever comes later.

Take data with the TOP target with NEGATIVE polarization, 95 nA, until polarization is at 0.75 of its maximum value.

ANNEAL

1. Target experts will conduct the anneal.

2. Put the C target in beam to help boiling off He in the nose. Ask for 100 nA. IMPORTANT: Take a ½ h long run AFTER the nose is empty. Watch the HMS or BigCal rates: the nose will be empty when the rates stop changing after dropping, start a new run then.

3. Target experts will finish the anneal. Target expert should access the Hall to open by-pass valve to cool the nose quickly.

4. Once the anneal is complete and there is LHe in the nose, take a ½ h run with the EMPTY (a.k.a. cross hairs) target(enter Cross Hairs + He in run sheet), and another ½ h run on C+He, both at 100 nA.

p. 1/2

02/11/09

2002-01-22T11:11:21