SANE Short Term Run Plan – Sat. 2/28 eve – Sun. 3/1 owl/day/eve

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

Sat. 2/28 eve to Sun. 3/1 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 : 85 to 105 nA

check that the SR is ON and configured for 20 mm diameter, 4.7 GeV beam. Wavetek generators preset 5: spiral = 1.16 V; circles 1 & 2 = 1.10 V

fast raster 1 x 1 mm

beam at x = -2.66, y = 0.06 mm on BPM 3H00A;

x = -3.35, y = 0.62 mm on BPM 3H00B (weighted averages of runs in hclog entry 174505)

DATA:

HMS: should be set to central momentum to 3.585 GeV, 22.3, protons.

Make sure all detectors are ON, LED's off and retracted, prescale factors and trigger type correct, etc. before starting

Ask for 65 nA. 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.

If there is a significant (>1.5 mm = 0.060 encoder units) mismatch in the vertical direction between the encoder setting and the cross hairs plot, or the rim of the target cup is clearly visible at the top or bottom of the raster plot, adjust the target position by a small amount ( 1.5mm).

If the cross hairs look off center in the horizontal, or the rim is visible on the left or right, ask MCC to move the beam by –0.5 or +0.5 mm on BPM 3H00B. Do NOT move the beam more than +/-0.5 mm from the settings shown above. Moving the beam to a more negative x position is the more likely option.

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 more than 30 min to get to 50%, it can/will improve with beam. Ask for 105 nA and start taking data.

If the polarization increases with beam continue at 105 nA for up to one hour after the polarization starts dropping, then take data at 90 nA until the polarization drops below 60%.

If the polarization does not increase after 2 h of beam, switch to TOP target.

If the polarization rises above 60% in  30 min, ask for 90 nA, take ~1 h long runs. If the polarization continues to increase with beam, ask for 100 nA, but reduce the current back to 90 nA once the maximum polarization is attained. When the polarization is around 62% take data at 105 nA. Continue with 1 h runs until the polarization is at ~ 0.75 of its maximum value or 60%, whichever is higher.

If the polarization rises quickly but it does not get significantly above 70%, and it starts dropping as soon as beam is turned on, take data at 85 nA. When the polarization is around 62% take data at 95 nA. Switch to TOP target when the polarization drops below 60%.

Take data with the TOP target with NEGATIVE polarization, 90 nA, until polarization is at ~ 0.75 of its maximum value. Follow the guidelines on beam current for the BOTTOM target

ANNEAL

1. Target experts will conduct the anneal.

2. Put C target in beam to help boiling off He in the nose. Ask for 150 nA. Take a 20 min 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 the run then.

3. Target experts will finish the anneal.

p. 2/2

02/28/09

Oscar Rondon

2002-01-22T11:11:21