SANE Short Term Run Plan –Mon. 2/16 eve – Tue. 2/17 owl/day

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

Mon. 2/15 eve to Tue. 2/16 day. 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.

SPECIAL ITEMS: Tue. 2/17 DAY will ramp magnet down to re-insert the forward tracker and add an iron shiled for the cherenkov. May change target material when work on pivot is done (including NMR tuning, magnet ramp back up, and TE calibrations into EVE shift).

BEAM (for production runs):

Current : start with 85 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

beam at x = -0.0, 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 4.17 GeV/c, 22, protons for ep elastics.

Check target and beam centering with cross hairs target. Take a short run (<10 min) and look at the slow raster ADC plot. The cross hairs should look reasonably centered (within 1 mm) in the vertical and horizontal, and the rim of the cup should not be visible at the edges of the raster. Use target encoder values of hclog 175960.

If beam centering is needed, follow run plan for 2/13/09, in the binder and on the wiki. Don't steer the beam more than +/- 0.5 mm from above positions.

Take data with the BOTTOM target with POSITIVE 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 100 nA and start taking data, continue for up to 4 h total time.

If the polarization rises above 60% in  30 min, ask for 85 nA when P ~70%, take ~1 h long runs. Continue with 1 h runs until the polarization is at ~ 0.75 of its maximum value. Watch the rate of polarization decay: if it exceeds more than ~ 5%/h (absolute) stay at 85 nA. After the polarization drops below ~ 70%, ask for 95 nA.

Take data with the TOP target with POSITIVE polarization, ask for 85 nA when P ~ 70%, until 5:00 AM.

TO: Do TE's on both cups. Follow specific instructions from the target experts.

After TE's are done, magnet will be ramped down

p. 2/2

02/16/09

O R

2002-01-22T11:11:21