MEASUREMENTS TO BE MADE WITH BEAM DRAFT 25 Sept. 1996 V. Burkert, D. Sober This schedule was discussed at the CalCom representatives meeting of Sept. 1996. Some items to be clarified are indicated by Notes. SYSTEMS ABBREVIATIONS: Ac = Accelerator LEFT COLUMN SYMBOLS: BL = Beam line devices Tag = tagger magnet field on CC = Cerenkov counters Rad = tagger radiator in DC = Drift chambers Tor = CLAS torus field on EC = Electron calorimeter Min = Mini-torus field on Ta = Tagger Tgt = CLAS target in TOF = TOF counters Tr = Trigger + DAQ T R T M T a a o i g Estimated Systems g d r n t 8-hour shifts 1 Test Hall B interlocks 1 Ac + - + - - 2 Tune 2.4 GeV beam up to tagger dump 3 Ac,Ta, BL 3 Measure background rates (from tagger dump) 1 all in CLAS and tagger detectors - - + - - 4 Steer e beam to Faraday cup 1 Ac,BL 5 Optimize backgrounds vs beam steering 1 Ac,BL, all 6 Tune lowest possible current 0.5 AC Note: Maybe move #6 later in run? - - + + + 7 Mini-torus on Thin C target in (L < 10^33 cm^-2 s^-1 => 3 mg/cm2 12C at 100 nA) 8 Optimize mini-torus current, TOF,EC, observing drift chamber currents and CC,DC TOF, EC, CC, Reg.I rates 1 9 Determine DC gas gains for run 0.5 DC Note: May want to reverse order of 8 and 9. 10 Electron triggers (Level 1): TOF,TR, TOF.EC.[CC] EC,CC 11 Vary EC energy threshold to get clean trigger 0.5 EC 12 Check events using CLAS Event Display (CED) 0.5 all 13 Take data with EC.TOF, TOF.CC to check EC,CC CC, EC efficiencies 0.5 14 On-line histograms for diagnostics: TO BE DEFINED by Working Groups 15 Write data for off-line analysis: 4 all Various level 1 triggers (TO BE DEFINED) Vary DC HV? (TO BE DEFINED) Other (TO BE DEFINED) 16 Test Level 2 trigger in one sector 1 TR - - - + + 17 CLAS Torus off, Mini torus on Take data with minimum ionizing trigger in EC, TOF for calibration 1 EC,TOF - - - - + 18 Torus off, Mini-torus off Very thin target (0.3mg/cm2, L=10^32/cm2sec) Test DC performance for alignment measurements with straight tracks 0.5 DC,EC,TOF + + - - - 19 Tagger magnet on, radiator in, beam counter at Faraday cup: Write data to check tagger counter timing, etc. 2 Ta __________ Total 19 (= 6.3 days) CONTINGENCIES: The above list accounts for only 19 of the scheduled 21 shifts, and is (possibly) generous in the 3 shifts scheduled for initial beam tuning. If accelerator problems take up more time than scheduled, preventing completion of the program listed above, then we propose 1) reducing the 4 shifts of writing data for off-line analysis to 3 or possibly 2 shifts 2) dropping tasks from the end of the list.