SANE Short Term Run Plan –Sun. 2/22 eve – Mon. 2/23 owl/day

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

Sun. 2/22 eve to Mon. 2/23 owl/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.

FIRST:

The target performance after the anneal at 2:00 AM points to another anneal around midnight today Sun. 2/22.

At the start of the anneal check the size of the slow raster per log entry number 177048

After the anneal follow the instructions below on what current to use depending on the result of the anneal (also on hclog 176976).

BEAM (for production runs):

Current : 85 to 110 nA, as needed depending on the response of the polarization.

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

If needed, adjust Slow Raster to have 20 mm diameter (hclog 177048)

fast raster 1 x 1 mm

beam at x = -1.0, y = -0.66 mm on BPM 3H00A;

x = -1.5, y = -0.3 mm on BPM 3H00B

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. Take a short run (<10 min) at about 60 nA and look at the slow raster ADC plot. No indications of the cup walls should be visible at the edges of the raster. Use target encoder values of hclog 176791.

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.

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

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 may be over annealed , it probably can/will improve with beam. Ask for 110 nA and start taking data.

If the polarization increases with beam continue at 110 nA for up to one hour after the polarization starts dropping, then take data at 95 nA until the polarization drops below 60%.

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

If the polarization rises above 60% in  30 min, anneal was OK. Ask for 95 nA, take ~1 h long runs. Continue with 1 h runs until the polarization is at ~ 0.75 of its maximum value.

If the polarization rises quickly but it does not get significantly above 70%, and it starts dropping as soon as beam is turned on, it probably is under annealed: 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, 95 nA, until polarization is at ~ 0.75 of its maximum value. The current vs polarization criteria for the BOTTOM target also apply to the TOP.

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 150 nA. Take data until 15 min. after the nose is empty of He.

3. Target experts will finish the anneal.

4. Continue with NH3 production data.

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02/22/09

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2002-01-22T11:11:21