List of Runs and their (rough) contents... -RPM 02.09.16 Covers runs from 12 June to 4 September, 2002. [The URL for the first Elog entry of a particular day is in the following format: http://midtwist.triumf.ca:8081/EL/YYMMDD.0?exp=twist replacing YYMMDD with the date desired.] =============================================== Testing many things; see runlog. 5167--5203 ###MAP: Cables changed for PC's 6 and 8. *** http://midtwist.triumf.ca:8081/EL/020611.0?exp=twist 5166 ###MAP: Replaced TDC modules. *** http://midtwist.triumf.ca:8081/EL/020616.4407?exp=twist 5187 ###MAP: A list of which CAMAC scalers are which is available. *** http://midtwist.triumf.ca:8081/EL/020618.16014?exp=twist I don't know for which range of runs this applies, but it's posted at run 5201. Checking noise levels. See elog for details. *** http://midtwist.triumf.ca:8081/EL/020619.905?exp=twist 5204--5216 More testing (this time of the new BUSY signal on FB crate 2). 5217--5229 Efficiency scans, 120 MeV/c pions. (Interesting plot in the first elog.) *** http://midtwist.triumf.ca:8081/EL/020619.4207?exp=twist *** http://midtwist.triumf.ca:8081/EL/020619.7946?exp=twist But there's a problem with some of the thresholds here! *** Elog: NOTE: We went through the postamps to verify the threshold settings. They are precisely as given in Blair's shift summary: > PC thresholds at -175mV > (PCs, and Target are > Crate0:Slots1-8,Crate2:Slots16-21,Crate5:Slots5-20,Crate8:Slots4-9) > > DC thresholds at -125mV However, there is a problem with all the runs up through (and including) run 5247. Postamp Crate10:Slots17-24 are also PC postamps. They are for planes 10 and 12. To date, they have been at -125mV, not the -175mV that they were supposed to be at. We are about to raise them to -175mV to match the rest. *** http://midtwist.triumf.ca:8081/EL/020619.6240?exp=twist 5235--5247 Beam studies. Elog starts here: *** http://midtwist.triumf.ca:8081/EL/020619.9119?exp=twist And this elog is a nice summary: *** http://midtwist.triumf.ca:8081/EL/020619.10690?exp=twist 5250--5254 More testing. 5255--5264 PC efficiency scans, 120 MeV/c pion spray. 5265--5272 Beam tuning (not useful?) 5274 Downstream-stopping cloud muons (for alignment), 31 MeV/c. *** http://midtwist.triumf.ca:8081/EL/020620.0?exp=twist *** Elog: run05275, 05276, 05277 at nominal settings: 31 MeV/c cloud muons stopping downstream for alignment. These 3 runs contain a total of 3.8 M triggers. *** http://midtwist.triumf.ca:8081/EL/020620.3835?exp=twist 5275--5277 Target-stopping surface muons, 29.4 MeV/c. *** Elog: run05278, 5279, 5280 at nominal HV/thr settings; B1= 870.2, B2=945.9: 29.4 MeV/c surface beams stopping at target for alignment study. The three runs contain a total of 3 M triggers. *** http://midtwist.triumf.ca:8081/EL/020620.4251?exp=twist run05281, 5282, 5283 at nominal HV/thr settings: 29.4 MeV/c surface muons stopping upstream for alignment studies. The three runs have a total of 3.1 M triggers. *** http://midtwist.triumf.ca:8081/EL/020620.4709?exp=twist 5278--5283 120 MeV/c pion spray, for alignment. See runlog and elog for details. Relavent elog entries start here: *** http://midtwist.triumf.ca:8081/EL/020620.5147?exp=twist Keep reading for a while; there's lots of elog entries about these runs. 5284--5293 *** Elog: Run 5294 is a special test run with the HV cables swapped between PC2 and PC10. The trigger was DS with 120 MeV/c spray tune, B2 nominal. All PC HV=2050V. *** http://midtwist.triumf.ca:8081/EL/020620.11974?exp=twist *** http://midtwist.triumf.ca:8081/EL/020620.12411?exp=twist 5294 PC efficiency study, 120 MeV/c pions (one with spray, three not). See runlog and elog for details. *** http://midtwist.triumf.ca:8081/EL/020620.12821?exp=twist 5295--5298 Beam studies, various momenta. See runlog and elog. *** http://midtwist.triumf.ca:8081/EL/020620.15652?exp=twist *** http://midtwist.triumf.ca:8081/EL/020620.32578?exp=twist 5299--5304 PACT studies. See runlog and elog. Relavent elog entries are scattered around; do a query on run numbers, or start here and use "next" a lot: *** http://midtwist.triumf.ca:8081/EL/020620.33553?exp=twist Here's a useful summary of the last few: *** http://midtwist.triumf.ca:8081/EL/020621.11475?exp=twist 5305--5323 MAGNET QUENCH. :( ###MAP: Found a couple of cable problems with a test run. *** http://midtwist.triumf.ca:8081/EL/020621.15514?exp=twist 5325 SWITCH CHAMBER GAS to Argon/Isobutane. PC Argon/Isobutane gas test data, 120 MeV/c pion spray. *** Elog: Runs taken to determine PC HV for Ar/Iso 40/60 in PC's. When finished turned all chamber voltages to 0 and turned of FB power (still don't trust the interlocks) Run PC(HV) PC eff 5327 1700 suspicious pulser event??? 5328 1750 90.07 5329 1800 98.79 5330 1850 99.86 5331 1900 99.98 5332 1950 99.92 This looks to be the operating point 5333 2000 5334 2050 - short as PC4 tripped off. 5335 2050 *** http://midtwist.triumf.ca:8081/EL/020704.2231?exp=twist 5327--5335 Pedestal calibration and other tests. 5336--5349 PACT tests (see runlog). 5350--5357 Beam tuning. See elog and runlog. In elog, start here and browse: *** http://midtwist.triumf.ca:8081/EL/020711.1929?exp=twist 5358--5365 PACT energy loss calibrations. (See runlog) 5366 Thresholds in PC test, for crosstalk studies. (See runlog.) *** http://midtwist.triumf.ca:8081/EL/020712.2264?exp=twist 5367--5371 PACT testing (see runlog). 5372--5374 Attempt at finding unpolarized muon beam. (See runlog.) 5375--5389 Surface muons, various gas degrader settings. (See runlog.) Here's a good summary: *** http://midtwist.triumf.ca:8081/EL/020716.8868?exp=twist 5390--5396 Alignment data, 120 MeV/c pion spray. Various slit and jaw settings, and a prescaler was used at times. But most use the same settings. See runlog for details. *** Elog: We have taken 15 runs of 1M triggers each for alignment. Beam used was 120 MeV/c with opened slits. Upstream PCs were turned off because of large currents, most probably due to some low energy particles (protons?) stopping in the dense stack. Due to the high rate a prescale of 8 was used. The relevent run numbers are 5401-5415. *** http://midtwist.triumf.ca:8081/EL/020718.1159?exp=twist 5397--5416 Attempts to understand heavily-ionizing particles in the pion beam. 120 MeV/c pion spray. Discussion here: *** http://midtwist.triumf.ca:8081/EL/020718.2802?exp=twist Details of the runs: *** Elog: Data with different beam rates at 120MeV/c with trigger M12 had been taken in order to understand low range particles (protons?) which stop in the dense stack. These runs are 5417-5420. Run M PU DS Event rate 5417 40k 17k 14k 3200 5418 16k 7k 6k 3900 5419 16k 3k 4.6k 3700 5420 10k 2k 2.8k 3600 *** http://midtwist.triumf.ca:8081/EL/020718.7300?exp=twist 5417--5420 Rate study. (Details in runlog.) *** Elog: Set of runs were taken to study "clean events" vs rate with M12 trigger. Thresholds on M1, M2 and M12 are set to 35mV. All DCs at 1950V, US iDS PCs at 1950V. Settings and rates are shown in the table: Run F0jaws F0slits F1slits F2slits M PU DS Ev.rate 5421 8mm 13mm 15mm 12mm 600 2.3k 3.3k 650 5422 8mm 23mm 15mm 12mm 1000 3.4k 5.3k 1000 5423 8mm 40mm 15mm 25mm 1450 8.7k 8.4k 1350 5424 15mm 40mm 15mm 25mm 3.3k 15.5k 17.2k 2650 5425 25mm 40mm 15mm 25mm 6.5k 27k 32k 3500 *** http://midtwist.triumf.ca:8081/EL/020718.7300?exp=twist 5421--5425 Threshold study. (Details in runlog.) *** Elog: Crosstalk vs threshold study. 29.4 MeV/c, trigger M1*M2 (Vthr=35mV). Slits: F0jaws=8mm, F0sl=40mm, F1sl=15mm, F2sl=25mm Rates: M=1300Hz, PU=8k, DS=7.5k All target PCs stay at their nominal HV. Thresholds are changed on all postamps (DCs and PCs). Run DCs HV us&ds PCs HV Threshold Event rate 5426 1850V 1950V 200mV 1200 5427 1900V 2000V 200mV 1200 5428 1950V 2050V 200mV 1200 5429 1950V 2050V 250mV 1150 5430 1900V 2000V 250mV 1150 5431 1850V 1950V 250mV 1100 5432 1850V 1950V 300mV 1100 5433 1950V 2000V 300mV 1100 5434 2000V 2050V 300mV 1100 5435 1900V 2000V 300mV 1100 5436 1950V 2050V 300mV 1100 HVs for target PCs (VSet values): PC5=2025, PC6=1983, PC7=1918, PC8=2002 Gas degrader is set at 93% He (set flows are 0.093 He and 0.007 CO2). *** http://midtwist.triumf.ca:8081/EL/020718.7300?exp=twist Also, 5437 and 5445 were taken with lower HV . 5426--5437, 5445 HV and thresholds set at this point are recorded here: *** http://midtwist.triumf.ca:8081/EL/020718.17158?exp=twist PACT and muon distribution studies; various gas degrader settings etc. (See runlog.) 5446--5447 Alignment data. 120 MeV/c pion spray. M13 absorber in position 1 to stop protons. *** Elog: Runs 5452 - 5459 are alignment data taken under the same conditions (apart from some slit width variations). The slits were opened wide to give a wide beam. Trigger is DS positron scintillator for all of these runs. Absorber 1 was used to stop beam protons. Each file has about 1.5 million events. The beam tune was a standard 120 MeV/c file spray tune, with slits wide open. *** http://midtwist.triumf.ca:8081/EL/020718.22196?exp=twist 5452--5459 Muon stop study. Various gas degrader settings (see runlog). *** Elog: We switched to a muon beam at 29.4 Mev/c (m13beam_29p4.snap). Switched trigger to muon counter. Removed absorber. Current gas degrader is 44% He. We will take data at this setting then change the degrader mixture. *** http://midtwist.triumf.ca:8081/EL/020718.22857?exp=twist Beamline settings here: *** http://midtwist.triumf.ca:8081/EL/020719.2161?exp=twist Some results here (including later runs): *** http://midtwist.triumf.ca:8081/EL/020719.12733?exp=twist 5460--5463 Various attempts to stop pions. (See runlog.) 5464--5468 More muon stopping studies. Some results here: *** http://midtwist.triumf.ca:8081/EL/020719.12733?exp=twist 5469--5470 Defocussed surface muon beam, to "reconstruct" the muon counter. Discussion here: *** http://midtwist.triumf.ca:8081/EL/020720.0?exp=twist 5471--5472 Focussed 120 MeV/c pion beam, for alignment. (DS trigger.) M13 status and detailed explanation of runs here: *** http://midtwist.triumf.ca:8081/EL/020720.1488?exp=twist *** Elog: Finished taking alignment data with focused beam, DS trigger. Good runs are 5475, 5476. *** http://midtwist.triumf.ca:8081/EL/020720.3502?exp=twist 5473--5476 HV is off for run 5477. Stopped pion runs. Various plastic degrader settings. M13 settings here: *** http://midtwist.triumf.ca:8081/EL/020720.5327?exp=twist A bit of commentary: *** http://midtwist.triumf.ca:8081/EL/020720.8232?exp=twist 5478--5484 Surface muons, "test for rate". 5486--5487 More checks on stopping position. Various gas degrader settings, and various lengths of time since changes (for checking how long it takes the gas degrader to stabilize at the new setting). See runlog, and elog near this entry: *** http://midtwist.triumf.ca:8081/EL/020721.6045?exp=twist (The next few entries have some good details on the "stabilization" thing.) Summary here: *** http://midtwist.triumf.ca:8081/EL/020721.24498?exp=twist and here, with plots: *** http://midtwist.triumf.ca:8081/EL/020722.2303?exp=twist 5488--5510 Unpolarized (or "less-polarized") muons stopping near the target. Various film degrader settings etc. See runlog, and elog starting here: *** http://midtwist.triumf.ca:8081/EL/020721.23179?exp=twist (Lots of info further on in the elog, too.) Note that 5516 had 40% He, not 60%! Summary here, with plots: *** http://midtwist.triumf.ca:8081/EL/020722.2303?exp=twist 5511--5528 SWITCH CHAMBER GAS back to CF4/Isobutane. (Or maybe not! See below!) Study stopping distribution; various gas degrader settings (see runlog). Beam settings and initial summary here: *** http://midtwist.triumf.ca:8081/EL/020725.699?exp=twist 5529--5535 Data to check consistency (looking for some TDC width anomaly); various HV and threshold settings. See runlog, and this elog: http://midtwist.triumf.ca:8081/EL/020725.5822?exp=twist 5536--5540 Nominal PC and DC HV and Threshold settings (these have been used for "nominal" settings for a while, now): *** http://midtwist.triumf.ca:8081/EL/020725.6624?exp=twist Gas degrader studies. 29.6 MeV/c surface muons. *** http://midtwist.triumf.ca:8081/EL/020725.11898?exp=twist 5541--5550 PACT pedestal runs. 5551--5552 Study of the "time constant" of the gas degrader (ie. how long it takes to completely change gases to a new setting). 3 mil film degrader in place to stop muons upstream. Still using 29.6 MeV/c muons, I believe. Summary here, with plot: *** http://midtwist.triumf.ca:8081/EL/020726.5488?exp=twist Start with 100% He and switch to 0%... 5553--5575 Now set it to 100% and take some more runs. 5576--5587 Momentum scan. See runlog, and elog (some runs weren't good): *** http://midtwist.triumf.ca:8081/EL/020728.0?exp=twist 5588--5608 Rate study. See runlog and elog for details: *** http://midtwist.triumf.ca:8081/EL/020728.10171?exp=twist 5609--5611 Momentum scan, visual scalers only (no data): *** http://midtwist.triumf.ca:8081/EL/020730.0?exp=twist Threshold scan, 29.4 MeV/c muons. See runlog. Note: *** Elog: I forgot to do a set hardware, so runs 5615 and 5616 are at PCVth=175mV, rather than the setting stated in the comment. *** http://midtwist.triumf.ca:8081/EL/020730.5688?exp=twist Nice summary: *** http://midtwist.triumf.ca:8081/EL/020730.6108?exp=twist 5614--5621 Threshold scan, 120 MeV/c pions (focussed, I think). M13 plastic degrader set at position 0. *** http://midtwist.triumf.ca:8081/EL/020730.6672?exp=twist Summary: *** http://midtwist.triumf.ca:8081/EL/020731.3275?exp=twist 5622--5629 SWITCH CHAMBER GAS back to CF4/Isobutane. *** Elog: Gas flows to PC's and DC's were changed back to CF4/Isobutane and DME starting around 2:00 PM this afternoon. I will let chambers and cradle purge overnight, then purge out sense lines and restore normal operating conditions tomorrow afternoon. I hope to be finished by early tomorrow evening. *** http://midtwist.triumf.ca:8081/EL/020821.0?exp=twist (So maybe the previous set of info was with the other gas; I'll look into it...) Settings for Thresholds, scintillator HV and cabling, etc: *** http://midtwist.triumf.ca:8081/EL/020822.6865?exp=twist *** http://midtwist.triumf.ca:8081/EL/020822.7835?exp=twist Pulser tests. See runlog and elog. *** http://midtwist.triumf.ca:8081/EL/020823.993?exp=twist 5670--5676 Alignment data. 120 MeV/c pions (focussed?). Beam settings here: *** http://midtwist.triumf.ca:8081/EL/020823.2174?exp=twist Trigger rate was mucked with for a while; the first few runs might be messy. (See runlog and elog.) A good summary of this data is here: *** http://midtwist.triumf.ca:8081/EL/020823.3514?exp=twist (In particular, 5686--5691 don't seem like useful runs.) 5677--5690 Attempts to see pions in the M trigger (what runs 5686--5691 were supposed to be). See runlog and elog: *** http://midtwist.triumf.ca:8081/EL/020823.11603?exp=twist 5693--5697 Test of MLT as trigger, Q6 turned off. See runlog. 5698--5701 Low-field runs, taken during field ramp. SEE RUNLOG; some of these are empty. 5702--5715 Field at ~1.5 T, 120 MeV/c pion spray for time zero studies etc. 5723--5737 Beamline settings summarized here: *** http://midtwist.triumf.ca:8081/EL/020826.16074?exp=twist Field at ~1.5 T, 120 MeV/c pion spray for time zero studies etc. Muon trigger. Slits manipulated and triggers changed several times in here; see runlog. Resummarization of beamline settings as of run 5757: *** http://midtwist.triumf.ca:8081/EL/020826.19052?exp=twist Summary of these runs: *** http://midtwist.triumf.ca:8081/EL/020827.9416?exp=twist 5738--5790 30 MeV/c, going for positrons with large p_perp. *** http://midtwist.triumf.ca:8081/EL/020827.10815?exp=twist 5791--5793 Stopped muons during magnet ramp, with unstable beam, for energy calibration purposes. Beamline settings: *** http://midtwist.triumf.ca:8081/EL/020827.20268?exp=twist 5794--5806 MAGNET RAMP COMPLETED. Field at about 2 Tesla. Compare rates with November run. Stopped muons. Low duty factor beam. *** http://midtwist.triumf.ca:8081/EL/020827.25450?exp=twist 5807 Stopped muon data. See runlog for slits etc. 5808--5824 30.58 MeV/c data, various B2 settings. *** http://midtwist.triumf.ca:8081/EL/020828.2732?exp=twist *** http://midtwist.triumf.ca:8081/EL/020828.3745?exp=twist Nice summary: *** http://midtwist.triumf.ca:8081/EL/020828.4891?exp=twist 5825--5832 Ditto, 35 MeV/c. *** http://midtwist.triumf.ca:8081/EL/020828.4891?exp=twist 5833--5840 ibid., 40 MeV/c. *** http://midtwist.triumf.ca:8081/EL/020828.4891?exp=twist 5841--5843 "High rate" data (3--6 kHz), 29.4 MeV/c. See runlog for slit settings (they change) and rates (they change). *** http://midtwist.triumf.ca:8081/EL/020828.4891?exp=twist 5844--5849 PC4 VOLTAGE TRIPS OFF AROUND HERE... *** http://midtwist.triumf.ca:8081/EL/020829.2501?exp=twist Check beta source use (using downstream source holder); beta source in various locations. See runlog. *** http://midtwist.triumf.ca:8081/EL/020828.17583?exp=twist 5852--5858 Checking rates, cf. November. *** http://midtwist.triumf.ca:8081/EL/020828.20129?exp=twist 5860 Positron beam (30 MeV/c, high p_t, B2 at +4%, MLT trigger -- although SOMEBODY didn't record this trigger change in the runlog). *** http://midtwist.triumf.ca:8081/EL/020828.22306?exp=twist 5861--5865 45 MeV/c data, B2 at 0%. See runlog and this elog *** http://midtwist.triumf.ca:8081/EL/020828.23438?exp=twist although the two source of information conflict... 5866--5867 45 MeV/c, B2 at +2%. *** http://midtwist.triumf.ca:8081/EL/020828.23912?exp=twist 5868--5876 50 MeV/c, B2 at +2% *** http://midtwist.triumf.ca:8081/EL/020828.26236?exp=twist 5877--5886 High rate muons (29.4 MeV/c) stopping near the target. See runlog and elog. Trigger is still MLT, but rate is set by M visual scaler. *** http://midtwist.triumf.ca:8081/EL/020829.815?exp=twist (Note that the runlog claims some of these are at 29.6 MeV/c, but they're all at 29.4 according to the NMR history.) *** http://midtwist.triumf.ca:8081/EL/020829.5492?exp=twist 5887--5903 PC4 VOLTAGE RESTORED as of middle of run 5890. *** http://midtwist.triumf.ca:8081/EL/020829.2501?exp=twist High rate muons (29.6 MeV/c) stopping near the target. See runlog and elog. Trigger is still MLT, but rate is set by M visual scaler. *** http://midtwist.triumf.ca:8081/EL/020829.5492?exp=twist 5905--5943 "Low rate" muons, 29.6 MeV/c. Switch to M trigger. Rate around 2 kHz (I think; that's only mentioned as of 5964). *** http://midtwist.triumf.ca:8081/EL/020829.9151?exp=twist *** http://midtwist.triumf.ca:8081/EL/020829.13472?exp=twist 5945--5985 Event acceptance efficiency scan. Various rates; see runlog and elog. *** http://midtwist.triumf.ca:8081/EL/020829.14404?exp=twist 5986--5990 29.6 MeV/c muons with aluminium plate mounted Downstream (for systematics studies). There was a bender tweak in here. *** http://midtwist.triumf.ca:8081/EL/020829.15535?exp=twist *** http://midtwist.triumf.ca:8081/EL/020829.19480?exp=twist *** http://midtwist.triumf.ca:8081/EL/020830.0?exp=twist Settings: *** http://midtwist.triumf.ca:8081/EL/020830.4159?exp=twist Summary: *** http://midtwist.triumf.ca:8081/EL/020830.12357?exp=twist 5992--6122 Low rate beam tests. See runlog (no elog!). DS material removed. 6123--66147 Pedestal runs (see runlog!). 6148--6149 Set target PC HV's to 2050 V for test run. *** http://midtwist.triumf.ca:8081/EL/020830.15968?exp=twist *** http://midtwist.triumf.ca:8081/EL/020830.18140?exp=twist 6151 Return PC HV's, set gas degrader to 45% He. Still no downstream material. M rate set to 4 kHz. *** http://midtwist.triumf.ca:8081/EL/020830.15968?exp=twist *** http://midtwist.triumf.ca:8081/EL/020830.18140?exp=twist 6152--6156 Gas degrader to 50% He. M rate still 4 kHz. 6157--6161 Gas degrader to 50%. MLT trigger. PC5--8 to 2150 V for test. M rate still 4 kHz (I think). 6162 Ditto, at 2100 V. 6163 Ditto, at 2050 (not 2500) V. 6164 Gas degrader to 55%, PC's back to 2000 V. M rate 4 kHz (still). 6165--6170 More gas degrader range studies. See runlog. M rate still at 4 kHz, momentum still at 29.6 MeV/c, etc. 6171--6212 Gas degrader at 100% He, M rate at 4 kHz. This is a combination of "ranging" studies with "high rate" studies, I guess; the comment changes, but the run parameters don't. B1 and B2 are tweaked from time to time to correct for drift. 6213--6275 Back to 2kHz M rate. Add "thin" plastic degrader downstream. Good summary: *** http://midtwist.triumf.ca:8081/EL/020831.13269?exp=twist Beamline settings as of run 6380: *** http://midtwist.triumf.ca:8081/EL/020901.3682?exp=twist And we seem to have lost runs 6286, 6287, 6288: *** http://midtwist.triumf.ca:8081/EL/020901.12903?exp=twist 6276--6388 Changing from 100% to 70% He in the gas degrader... Otherwise the same conditions. Good summary: *** http://midtwist.triumf.ca:8081/EL/020901.28093?exp=twist 6389--6394 Gas degrader at 70% He. M rate at 4.1 kHz. ("High rate" studies.) Some DAQ trouble in here (0-event runs, etc). Good summary: *** http://midtwist.triumf.ca:8081/EL/020901.28093?exp=twist 6395--6441 "Low rate" studies. Flaky beam for the first two runs, then about 2kHz M rate. Slits changed part way in, to compensate for change in proton beam current. *** http://midtwist.triumf.ca:8081/EL/020901.32844?exp=twist *** http://midtwist.triumf.ca:8081/EL/020902.0?exp=twist *** http://midtwist.triumf.ca:8081/EL/020902.398?exp=twist 6442--6560 Gas degrader changing to 100% He. Still 4 kHz. 6561 Target PC threshold scan (see runlog). M rate = 2 kHz. 6562--6569 Stopping distribution study for mixed (surface+cloud) beam. Gas and filmstrip degraders manipulated during all this. M rate at around 1 kHz. See runlog. 29.9 MeV/c. *** http://midtwist.triumf.ca:8081/EL/020902.7834?exp=twist Beamline settings: *** http://midtwist.triumf.ca:8081/EL/020902.10811?exp=twist Note that run 6575 is during a gas degrader change: *** http://midtwist.triumf.ca:8081/EL/020902.10436?exp=twist Gas degrader changing during the last two runs. Nice summary: *** http://midtwist.triumf.ca:8081/EL/020902.12692?exp=twist 6570--6579 Gas degrader at 70%. Threshold/HV scan of outer PC's. Nice summary: *** http://midtwist.triumf.ca:8081/EL/020902.12692?exp=twist 6580--6588 Back to 29.6 MeV/c, stopping muons, for more "high rate" data. M rate ~4kHz. *** http://midtwist.triumf.ca:8081/EL/020903.0?exp=twist 6589--6656 B2 scan to find best value. (No data.) *** http://midtwist.triumf.ca:8081/EL/020903.22057?exp=twist Stuff. (??) 6662--6671 Momentum scan. (Ignore run 6680.) Note that Q6 values are not what they should be. *** http://midtwist.triumf.ca:8081/EL/020904.0?exp=twist *** http://midtwist.triumf.ca:8081/EL/020904.748?exp=twist Results: *** http://midtwist.triumf.ca:8081/EL/020904.1547?exp=twist 6672--6691 120 MeV/c pion spray. MLT trigger, ~7.3kHz. *** http://midtwist.triumf.ca:8081/EL/020904.3062?exp=twist 6692--6699 Ditto, PU trigger, ~700Hz. *** http://midtwist.triumf.ca:8081/EL/020904.6472?exp=twist 6700--6709 BEAM OFF for most of September. Beta source stuff (see runlog), for alignment. Changed trigger to PU11*PU12: *** http://midtwist.triumf.ca:8081/EL/020904.15068?exp=twist (Runs 6710--6711 have the wrong trigger: *** http://midtwist.triumf.ca:8081/EL/020904.17904?exp=twist ) Nice summary of beta runs: *** http://midtwist.triumf.ca:8081/EL/020904.22364?exp=twist 6712--6729 More beta source stuff, PU trigger. Rate is down to 20--30 Hz. Should be "high energy beta's". *** http://midtwist.triumf.ca:8081/EL/020904.19475?exp=twist *** http://midtwist.triumf.ca:8081/EL/020904.20558?exp=twist 6730--6731