0. Before ramping up the magnet: verify HVs and thresholds. (done) Pulser data: see all the channels. (done) Make sure the new DS scintillator work. (done) Set up additional discriminators with low thresholds to get M1L and M2L without disturbing M1 and M2. (done) Beam tune = 120MeV/c spray pions, Gas degrader=(does not matter here, the same as for the next item), Trigger=DS Take a control sample of t0 and alignment data. 6-10 2GB (10^6 events) runs. (done) I. Ramp to 2T slowly and take some stopped muon data at several rest stops! Instead: took data while ramping up the magnet. II. Field on efficiency and t0 check: @ 1.5T : 120MeV/c spray pions "Kinks and deltas" "Stopping muons". III. Systematics studies a. Study the positron "kinks and deltas". Find a channel tune that brings beam positrons into the spectrometer with a moderately large p-perp. This may imply mis tuning B2 relative to B1. Then take 10M beam positron events each at 30, 35, 40, 45, 50 MeV/c. Ideally, use the low-threshold M trigger for this to ensure that the positrons see minimum mass prior to the detector. Kinks and deltas: (positrons, MLT trigger) 5825-5831 8@1.2M=10M 30 MeV/c (B2 +/-2%,+4%) 5832-5840 7@1.1M=8M 35 MeV/c (B2 +4%) 5841-5843 3@1.0M=3M 40 MeV/c (B2 +2%) 5867-5876 10@1.0M=10M 45 " " 5877-5886 10@1.0M=10M 50 " " ==> we wanted 10M at each momentum, so we are a little short at 40 MeV/, otherwise fine. b0. Quick study of the (clean evts/all evts) vs rate. What's the DAQ limit on the rate for mu decay data? Scan 0.9kHz - 6.3kHz, runs 5986-5990 b. High/Low rate (4kHz vs 2kHz) High rate Low rate 40%He - 58M (5945-5987, 6123-6147) 70%He 90M (6395-6441,??) 97M (6442-6556) 100%He 48M (6213-6275) - d. Study effect of materials in the downstream end of the detector. One day of "thin" Lucite, one day with one of the metal plates @ 2kHz muon triggers, stopping in the center of the target. runs estimated events condition 5992-6122 130*0.87M=113M Al plate DS 6276-6388 113*0.890M=100M thin lucite DS 6389-6394 6*0.89M=5.4M ", %He changing from 100 to 70 f. Devote any remaining time to stopping distribution and PACT studies. : threshold/HV scan for TGT PCs : threshold/HV scan for outer PCs : tried for unpolarized beam; : momentum scan. e. Quick check with 120 MeV/c (spray) pion tune that nothing has changed. 6-10 2GB (10^6 events) runs. (Few hours.) Beam tune = 120MeV/c spray, Runs (MLT): 6692-6699 (8*1.8M), (PU): 6700-6708 (9*1.3M) g. beta source alignment data. runs 6710-6728 (200-300K), 6729(PU1, 0.8M), 6730-6731(PU, 2*0.8M)