Runplan for week of Nov 10, 2004 to Nov 17, 2004 1. Wednesday Nov 10/04 when beam comes back after maintenance, take "nominal" 29.6MeV/c runs with foil bulge set to different values. We hope to use this to calibrate and validate our foil bulge monitoring. To get these calibration runs, we will adjust the differential pressure to each of +10mTorr, +20mTorr, +30mTorr, +40mTorr, -10mTorr, -20mTorr. According to Robert Openshaw each mTorr is about 11.6 microns of bulge. For each setting follow these instructions. If you are doing one of the -ve settings, turn off HV to do the adjustment, then bring the voltage up slowly while monitoring DC/PC currents to make sure they do not trip. If chambers start tripping turn off the HV, and skip doing this setting. Borrowing from Robert's wording of how to adjust the differential pressure: It is simple to change the diff pressure. Just press the leftmost button at the bottom of the PID (don't hold it pressed down because it will switch into a more complicated mode for setting lots of other stuff you don't want to know about), and the display switches to "setpoint" mode. push the up or down errors to adjust the setpoint to the desired value, push the "enter" (far right button) to set the setpoint, and finally push the leftmost button to return to "normal" mode. You should see the pressure start to change immediately, and the flow (DME_Ret, channel #1 of MFC display/PS) also will change fairly dramatically. Wait for the pressure and flow to stabilise, and you're ready to take data. For small changes in diff pressure, it shouldn't be necessary to turn off the HV ... there's typically a small amount of overshoot, but nothing serious. We have interlocks set at +/- 200 mTorr from the "nominal" diff pressure setpoint. For DC_diff, nominal ~ 108 mTorr, so interlocks will trip at ~ +310 mTorr and -90 mtorr, and isolate the chambers from the gas system. This shouldn't be a problem, since you probably don't want to move setpoint more than +/- 50 mTorr (~ +550 micron bulge) from "nominal". When moving setpoint in the lower pressure direction, be sure to turn off the HV, and bring up the HV slowly since the gasgain will be increasing, and HV breakdown voltage decreasing. Monitor chamber current closely, and when it gets too high, stop the tests ... I'm not sure how far in negative direction you can go ... Probably at least 20 mTorr (~ 320 microns). When the pressure and flows stabalise (just a few minutes), you can start checking the muon stopping z to try to stop at 3/4 in the target (StopZ regulator = -0.3). We expect that bulging out you will need a larger fraction of He to make up for the extra material from DME in the bulge. Adjust the CO2 fraction to stop at 3/4 in the target. 2. Take t0 runs (What follows is from Art's notes on this). Use nominal 2004 tune for 29.6 MeV/c muons stopping in the target, but with a PU and separately DS trigger. The scint trigger on the positrons (MLT) is needed to give the initial time, and I believe there is an option in Mofia to produce proper t0 histograms and files in this mode. Daniel's work is still valid. However, it has been so long that the code needs checking. I think someting like 3 runs of each trigger are the minimum required, and leave the analysis till I'm back. 3. Starting night of 10 Nov. 2004, take a high rate set (>300 runs). Load the nominal tune. Nominal settings for 29.6MeV/c muons can be found on the nominal settings page: http://e614db.triumf.ca/~e614/private/online/nominalsettings.txt For high rate open F0Jaws to 24.0 mm, and F0Slits to 80.0 mm (all slits and jaw positions and widths set to +/- 0.1 mm please). The M rate should be about 4kHz. Set the regulators from the midas status page so that B1=871.30G, B2=944.0G. Set the z stopping regulator to stop at 3/4 in stopping target RegStopZR=-0.3. You may need to adjust the He/CO2 degrader to change the muon stopping (on ubeam panel from StatusBar). Run this setting until Friday morning or afternoon depending on if have 300 runs already or not. 4. Friday 12 Nov 2004, morning or afternoon install single aperature (1 cm cirular hole in aluminum plate) at downstream end of TEC box. This has been refered to as a collimator, but in this case there is only one aperature (so its just an aperature). Use the same high rate tune described in 3 above (except the rate will be much lower due to the aperature). My guess is that the rate will be > 1kHz, but it could be as low as 900 Hz. Run this setting until Monday morning ~8am when we can get the collimator removed (>300 runs). 4. Starting Monday 15 Nov 2004, take another nominal stop at 3/4 set (>300runs). Should use same settings as above, just take out collimator, and reduce F0Slits=60.0mm, and F0Jaws=18.0mm. Run this setting until maintenance starts on morning of Wed 17 Nov 2004.