Tasks for February Test Run PRELIMINARY 12 February 1997 5 days electrons at 2.4 GeV 6 days electrons + photons at 4.0 GeV Configuration for run: 7 o'clock: DC (forward angles), TOF, FEC, CC 1 o'clock: DC (forward to medium angles), TOF, FEC South clamshell: LAEC, readout only Solid targets (wires, C-12, CH2, for L = 2.10^34cm-2s-1 @ 100nA, ) Tagger radiator ladder (and harp) Tagger electronics and cabling complete Shifts ______ Day 1 Tune 2.4 GeV beam to Faraday cup 1 Beam steering: optimize rates 1 Tune low current beam -- test stability 0.5 Scan beam halo using tagger harp, target scanner + beam counters 0.5 Day 2 Accelerator test of Hall B running w/o witness beam 1 Measure background rates from FC @ 100nA w/o target Solid target in: Measure currents and rates vs. mini-torus 1 Day 3 Electron trigger: (TOF.EC), (TOF.CC), (EC.CC): Vary EC threshold for clean trigger 0.5 Check events with CLAS Event Display 0.5 Take data with EC o TOF, CC o TOF, EC o CC to measure efficiencies, prescale TOFs for uniform rates?; > 10^6 events/trigger 2 Day 4 CH-2 target, write data for off-line analysis: Several Level 1 triggers (see: RUN BOOK Info, 4 CALCOM-TR003), > 10^6 events/trigger type Day 5 Torus off, mini-torus on: Minimum ionizing trigger in EC, TOF; 5.10^6 evts 1 Torus off, mini-torus off, low luminosity (10^32) Straight tracks for testing DC positions; > 10^6 events 1 Day 6 Tagger magnet on, tune 4.0 GeV beam to dump 1 Radiator in: Check DAQ from all tagger crates 1 Tagger HV and timing calibrations 2 Day 7 Continuation of tagger OR other contingencies 2 Day 8 Tune 4 GeV beam to FC Check beam steering Tune and test low current beam stability Beam halo scan 2 Days 9-11 Similar to Days 2-5 8 Take data w/ random trigger at L=10^34cm-2s-1 1 Contingencies 2 Instrumentation and Goals for February Test Run: =============================================== 19 - Feb - 1997 CLAS configuration: -> 1 sector completely instrumented/read out - drift chambers R1, R2, R3 - Cherenkov counter - time-of-flight counters (forward region) - electromganetic calorimeters -> 2 additional sectors instrumented with - time-of-flight detectors (forward region) - electromagnetic calorimeters -> 1 sector instrumented with large angle calorimeter -> detectors in "final" position -> solid targets, torus magnet, mini-torus Goals: 1. Measure/optimize beam properties at two energies, currents from few nA to 100nA 2. Measure beam/target related background levels in all detectors and optimize operational conditions (target/current/mini torus) 3. Measure rates and event patterns (charged tracks, electrons, neutral electromagnetic hits) in all detector using various level 1 triggers 4. Measure/reconstruct drift chamber trajectories in all 3 regions. 5. Collect sufficient amount of data for tuning off-line calibration procedures - electron detection efficiencies - drift chamber efficiencies - scintillator timing resolution - calorimeter energy calibration - drift chamber alignment 6. Provide data to stimulate further reconstruction/ analysis software developments 7. Develop operational experience with a CLAS configuration containing all major detector systems 8. Tune tagger detection system