| I | Beam Energy: 1.953 GeV (Before 2/28/2000) | |
| HNSS Settings: Splitter = 1.593514 T / 454.604 A, Split-Pole = 1.599816 T / 398.75 A | ||
| SOS D Settings = 1.31398 GeV/c, SOS Q Settings = 1.31398 x 0.915 = 1.202 GeV/c | ||
| I.1 | Target: Empty. Beam Commissioning Test Plan I | MCC / Tang |
| Fast E lock on Hall A. Splitter and Split-Pole off. SSD off. | Gan / Gueye | |
| a. Ensure that the BCM electronics have been changed by AES group to | ||
| allow sensitivity in the low current range. | ||
| b. Set up Pulsed Beam (1.003 GeV) to the Dump. Beam straight through. | ||
| c. Set up 1 microAmp CW beam to the Dump. | ||
| d. Set the Maximum Current Limit to 2.5 microAmps for FSD system. | ||
| I.2 | Target: Empty / BeO. Beam Commissioning Test Plan II | MCC / Gan |
| Splitter and Split-Pole off / on. SSD off. Fast E lock on Hall A. | Gueye / Sato | |
| a. BCM masked to allow pulsed beam tune. | ||
| b. Repeat I.1.b - c of Test Plan I. | ||
| c. Take Harp Swipe. Adjust the beam spot size at the target to <250 mm in | ||
| X and < 150 mm in Y (FWHM). | ||
| d. Log the OTR and BPM readings to note the Beam Energy Quality. | ||
| e. Turn Off beam and insert the BeO Target. | ||
| f. Turn Beam On in pulsed mode. Observe the beam on the target. Record | ||
| the beam on target position (by BPMs in front of target chamber and on | ||
| BeO target). | ||
| g. Turn off the beam. Turn on both the Splitter and Split-Pole Magnets to the | ||
| nominal setting for 1.003 GeV. | ||
| h. Turn Beam on in pulsed mode. The electron beam now will head towards | ||
| the Dumplette. | ||
| i. Observe the beam on BeO to check the Splitter fringe field effect on beam | ||
| position on target. Find offset needed for the position found in j. | ||
| j. Observe the beam on Viewer ITV3H00B downstream of the target | ||
| chamber and viewer or monitor in front of the Dumplette. | ||
| k. Using the BT magnets, steer the beam to the Dumplette. | ||
| l. Explore the range of the BT magnets with Splitter settings at extremes (as | ||
| dictated by the experiment's needs). If the BT's cannot center the beam on | ||
| the dumplette face, we may need to add more correctors. | ||
| m. Verify beam monitoring systems, displays, alarms, and EPICS quantities | ||
| for beam quality monitoring in data stream. | ||
| n. Check SOS trigger timings, 3/4, AC, LC, and GC. Prepare triggers. | Sato/ Fujii | |
| o. Check Online replay. | Sato | |
| p. Check HNSS hodoscope rate and displays. | Fujii / Gan | |
| I.3 | Target: BeO. Beam Commissioning Test Plan III | MCC / Mack |
| Splitter and Split-Pole on. SSD off. Fast E lock on Hall A. | Jinghua | |
| a. Notify the other halls. Current calibrations occur in the injector using | ||
| 5 MeV Faraday cup. | ||
| b. Ensure that 30 Hz system or some other system that verifies clean aperture | ||
| to Hall C is working. | ||
| c. Turn Hall A and B lasers off. | ||
| d. Check machine aperatures with the 30 Hz system. | ||
| e. Record the voltages in the elog. Turn off the 30 Hz system. | ||
| f. Hall C slit wide open. Stable nominal 1 microA beam to Hall C. | ||
| g. (In the following, don't do anything that would knowingly change the | ||
| Hall C current.) | ||
| h. Steer beam to injector Faraday cup. Measure current. Record in the elog. | ||
| i. Restore beam to Hall C. Measure power emitted from bcm1, bcm2. | ||
| j. Steer beam to injector Faraday cup again. Measure current. Record in the | ||
| elog. | ||
| k. Back out (i.e., restore Halls A, B, and C. Hall C slits to nominal position.) | ||
| l. Continue to check SOS trigger timings and get KIP ready. | Sato / Fujii | |
| I.4 | Target: BeO. Beam Commissioning Test Plan IV. | MCC / Ent |
| Splitter and Split-Pole on. SSD off. SOS sieve slit. SOS 3/4 trigger. | Jinghua / Yuan | |
| Fast E lock on Hall A. Hall C fast position lock. Beam Current: 1mA. | Murad | |
| a. Short SOS sieve slit run and check SOS optical center. | ||
| b. Adjusts beam position on target. | ||
| c. Adjust BT correctors to keep beam aiming to the Dumplette. | ||
| d. Repeat a to c to find finalized beam position on target. | ||
| c. Record in elog on the defined beam position on target. | ||
| d. MCC recheck the range of the BT magnets for the extreme. | ||
| e. Tune SOS Q to find the best FP tune. | ||
| II | SOS and HNSS Commissioning | |
| II.1 | Part 1. SOS Trigger and HNSS Detector System | Sato / Fujii |
| Target: BeO. Posted 1.953 GeV HNSS setting. | Jinghua | |
| Fast energy lock on Hall A. Hall C fast position lock on. No Raster. | ||
| a. Keep 1mA beam current and SOS large collimator. | ||
| b. Finalize the SOS trigger timing check: AC veto, LC coincidence, GC | ||
| veto. Lable the KID cables and complete the trigger diagram. | ||
| The trigger diagram must be in record. | ||
| c. Select SOS 3/4 trigger (e+). | ||
| d. Turn SSD on one at time. Check SSD performance. Threshold Scan. | Lan | |
| e. Check and tune timing gate for SSD. | Sato / Wood | |
| f. Check hodoscope signals and timing for TDC and ADC. | Fujii / Sato | |
| g. Hodoscope gain matching. Runs with SOS 3/4 trigger. | Fujii / Sato | |
| h. Take runs with SOS 3/4 trigger (500K each) and SSD threshold scan for | Fujii / Sato | |
| the following beam current: 0.5, 1.0, 1.5, and 2.0 mA. | Fujii / Sato | |
| Check and record needed hodoscope threshold at each current. | Fujii / Sato | |
| i. Analyze: | ||
| 1. Split-Pole focal plane profile, missing or hot channels, acceptance | Fujii /Sato/Tohoku | |
| 2. SSD and hodo rates as a function of beam current | Fujii /Sato/Tohoku | |
| 3. Threshold dependence with beam current (leakage current effect) | Fujii /Sato/Tohoku | |
| 4. SSD and hodo correlation and mapping check | Fujii /Sato/Tohoku | |
| 5. SSD and hodo efficiencies as a function of beam current | Fujii /Sato/Tohoku | |
| 6. Extract SOS positrons and check b resolution | Jinghua/Yuan/Murad | |
| 7. Check coincidence time (both arms with b=1 particles) | Fujii /Sato/Tohoku | |
| 8. Hodoscope pulse correction and timing resolution | Fujii /Sato/Tohoku | |
| 9. Path length correction parameter for each hodoscope | Fujii /Sato/Tohoku | |
| 10. Check timing resolution as a function of beam current | Fujii /Sato/Tohoku | |
| 11. First look at the optimization of the luminosity | Fujii /Sato/Tohoku | |
| j. Check SOS detector system performance. | Hamlet/Yerevan | |
| II.2 | Part 2. SOS Optics | |
| Target: BeO. Posted 1.953 GeV HNSS setting. Current: 1mA | Ent / Yuan | |
| Fast energy lock on Hall A. Hall C fast position lock on. No Raster. | ||
| a. Change SOS collimator to sieve slit. | ||
| b. Take sieve slit runs for a total of 600K triggers. | ||
| c. Extract updated reconstruction matrix elements | ||
| (Not necessarily the finalized version) | ||
| d. Evaluate construction quality at the current level. | ||
| e Continue to check on SOS detector performance | Hamlet/Yerevan | |
| f. Evaluation of the beam quality monitoring system | Gan / Gueye | |
| g. Continue to check on HNSS detector performance | Tohoku | |
| II.3 | Part 3. Backgrounds | Jinghua |
| Target: Empty. Posted 1.953 GeV HNSS setting. Current: 1mA | Ent | |
| Fast energy lock on Hall A. Hall C fast position lock on. | Murad | |
| a. Ensure no raster. | ||
| b. Change SOS collimator to Large. | ||
| c. Take Empty target runs w and w/o Splitter magnet. | ||
| d. Check background in HNSS by looking at the hodoscope rate change. | ||
| e. Turn off Split-Pole. | Tang | |
| f. With OTR in, use the 12.7 mm wire to study the profile. | Ent / Tang | |
| h. With OTR out, repeat the step f to determine the effect of OTR on | Ent / Tang | |
| beam spread. | ||
| II.4 | Part 4. SOS KID I | Jinghua |
| Target: BeO. Posted 1.953 GeV HNSS setting. Current: 1mA | Yuan / Murad | |
| Fast energy lock on Hall A. Hall C fast position lock on. | Hamlet / Yerevans | |
| a. Take a run with SOS 3/4 trigger (No PID) for 1M triggers | ||
| b. Study e+/h+ ratio in offline using shower counter and GC ADCs cuts | ||
| c. Add GC veto into trigger. | ||
| d. Take a run with about 200K triggers. | ||
| e. Study e+/h+ ratio in offline again. | ||
| (1) Obtain the e+ online rejection rate by GC veto | ||
| (2) Compare to step b GC ADC cuts | ||
| (3) Need minimum 97% online rejection. Adjust GC threshold if needed. | ||
| f. Offline study Lucite number of PE distribution (individuals and sum): | Jinghua/Yuan/Murad | |
| (1) Gain matching; (2) rang of NPE; (3) NPE (sume) vs b | ||
| g. Offline study Aerogel number of PE distribution (SUM): | Jinghua/Yuan/Murad | |
| (1) NPE vs b; (2) range of NPE. | ||
| h. Add Lucite into trigger (coincidence) with minimum threshold. | ||
| i. Take a series of runs (20 min) with different LC threshold settings. | ||
| j. Offline study on: | ||
| (1) b vs threshold settings; | ||
| (2) Rejection rate of low b particles and effect on the K+ region. | ||
| (3) A calibration of threshold to NPE cut. (1 PE = ? Threshold) | Jinghua/Yuan/Murad | |
| (4) Will 1 PE threshold setting work in rejecting >50% protons? | ||
| k. Add Aerogel veto into trigger. | ||
| l. Take a series of runs with different threshold settings starting from high. | ||
| m. Offline study on: | Jinghua/Yuan/Murad | |
| (1) e+ and p+ rejection rates; (2) Effect on K+; | ||
| (3) Determine the proper threshold. | ||
| III | Beam Energy: Finalization of SOS and HNSS | |
| HNSS Settings: Splitter = 1.593514 T / 454.604 A, Split-Pole = 1.599816 T / 398.75 A | ||
| SOS D Settings = 1.31398 GeV/c, SOS Q Settings = 1.31398 x 0.915 = 1.202 GeV/c | ||
| Reaction: O(e,e'K+) and p(e,e'K+) | ||
| III.1 | Target: BeO. SOS KID II. Reverification of what we understood. | Sato/Fujii/Jinghua |
| I = 1 mA. SOS large collimator. No Raster. O(e,e'K+) kinematics. | ||
| a. Two Runs with SOS 3/4 + determined KID (1 hour each): | Jinhua/Yuan/Murad | |
| (1) 0.8 mA; (2) 1.2 mA (Depending on HNSS hodo and SSD limit) | ||
| b. Offline study on: | Jinhua/Yuan/Murad | |
| (1) Verify the performance of the online hardware KID (trigger); | ||
| (2) Study coincidence timing resolution; | ||
| (3) S/A ratio for K+ after offline b separations vs beam current. | ||
| f. Continue to check on the performance of SSD and HNSS hodoscopes | Sato/Fujii/Tohoku | |
| in this period. | ||
| III.2 | Target: CH2. HNSS Focal Plane Calibration. | Fujii/Sato |
| I = 1 mA?. SOS large collimator. Raster (+/- 2.2x1.1 mm^2) !!! | Tohoku | |
| Fast energy lock on Hall A. Hall C fast position lock on. | ||
| p(e,e'K+)L kinematics. | ||
| a. With BeO target, Harp scan to verify raster size before change to CH2. | Gueye / Gan | |
| b. Take CH2 target runs for 24 hours or have at least 150 K events in the | Tohoku | |
| L peak. | ||
| c. Calibrate x vs Pe'. | Tohoku | |
| d. Estimate the time needed for short energy calibration run with a minimum | Tohoku | |
| of 500 events total in the L peak. | ||
| e. L peak width in the missing mass spectrum after the HNSS FP calibrated. | Tohoku | |
| Is it about 3 MeV (FWHM)? | ||
| f. Is HNSS detectors aligned OK? DP (SOS) vs DP (HNSS). | Tohoku | |
| III.3 | Target: BeO. Production Tryout (If 8 hours or more left) | Jinghua / Murad |
| I = 1 mA?. SOS large collimator. No Raster. O(e,e'K+) kinematics. | Yuan | |
| a. Change to BeO target. | ||
| b. Take optimized beam current (hodo capability and checked S/A ratio). | ||
| c. Run for O(e,e'K+) production for the rest of the time with this beam. | ||
| Notes: | ||
| Due to the time variation, we will not have fixed shift time for this commissioning | ||
| period. The listed persons who are responsible or participate in the planned | ||
| activities must be on call and provide us the contact phone numbers. The | ||
| coordinator will contact the next party at least 2 - 4 hours ahead of time. |