H4/SPS Daily meetings
September
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7
Status: First day of beam. We were supposed to have the beam at midnight, we got it at 3PM. The timing was looked at, the calorimeter signal is now coming earlier with respect to the tracker as compared to PS. BT 5 configutation with cal/tkr in the middle of the trigger window at SPS is now the baseline.The calibration of the calorimeter (cross pattern) at 100 GeV was started then interrupted to let the experts optimize the beam tuning at the highest energies. Many interruptions due to machine problems. Benoit attended the weekly users' meeting (moved from Thursadt to Wednesday as tomorrow is a holiday in Switzerland): there will be machine development (no beam) from next Tuesday 8 AM to Wednesday 4 PM. A threat on our running with the "0 mrd" configuration (allowing us to get the highest rate at high energy) was mentioned during the meeting, as the H2 users (sharing the same target) would like a less detrimental configuration for them. Finally, a way around was found and we wil keep this configuration at least until Monday.
Program: completion of the 100 GeV calibration runs, ACD calibration with protrons+pions, switch to 200 GeV, scanning of different (X,Y, theta) configurations
September 7
Status: The beam is now much more stable. Calorimeter calibration completed, ACD calibration completed, scanning of 200 GeV configurations almost completed. Some runs were repeated after it was found that 4 scintillators used for the beam tuning were still in and be moved out. The pressure in the 2 Cerenkovs (1.2 bars so far) was set to 0. The dependence of the calorimeter measured energy as a function of rate has been investigated ("baseline restoration" problem). The effect is clearly visible. We decide to limit the rate to 400 Hz for the rest of the run. The time of the daily meeting will be moved to 5 PM to enable people on the previous night shift to attend.
Program: switch to 280 GeV and repeat the same configurations. Specific BT configuration files will be prepared by Luca and Carmelo to study the FHE efficiency using the SPS timing settings. As proposed by Anders, the TEM diagnostics will be on by default (BT 6 which is now the baseline).
The beam is now much more stable. Calorimeter calibration completed, ACD calibration completed, scanning of 200 GeV configurations almost completed. Some runs were repeated after it was found that 4 scintillators used for the beam tuning were still in and be moved out. The pressure in the 2 Cerenkovs (1.2 bars so far) was set to 0. The dependence of the calorimeter measured energy as a function of rate has been investigated ("baseline restoration" problem). The effect is clearly visible. We decide to limit the rate to 400 Hz for the rest of the run. The time of the daily meeting will be moved to 5 PM to enable people on the previous night shift to attend.
Program: switch to 280 GeV and repeat the same configurations. Specific BT configuration files will be prepared by Luca and Carmelo to study the FHE efficiency using the SPS timing settings. As proposed by Anders, the TEM diagnostics will be on by default (BT 6 which is now the baseline).
Analysis: the first quick comparison with the MC simulations at 100 GeV shows a reasonable agreement for the tracker hit multiplicity (the multiplicity is larger for the data) and the energy deposited per layer in the calorimeter. No comparison is available for the ACD yet. More simulations are needed.
September 6
Status: First day of beam. We were supposed to have the beam at midnight, we got it at 3PM. The timing was looked at, the calorimeter signal is now coming earlier with respect to the tracker as compared to PS. BT 5 configutation with cal/tkr in the middle of the trigger window at SPS is now the baseline.The calibration of the calorimeter (cross pattern) at 100 GeV was started then interrupted to let the experts optimize the beam tuning at the highest energies. Many interruptions due to machine problems. Benoit attended the weekly users' meeting (moved from Thursadt to Wednesday as tomorrow is a holiday in Switzerland): there will be machine development (no beam) from next Tuesday 8 AM to Wednesday 4 PM. A threat on our running with the "0 mrd" configuration (allowing us to get the highest rate at high energy) was mentioned during the meeting, as the H2 users (sharing the same target) would like a less detrimental configuration for them. Finally, a way around was found and we wil keep this configuration at least until Monday.
Program: completion of the 100 GeV calibration runs, ACD calibration with protrons+pions, switch to 200 GeV, scanning of different (X,Y, theta) configurations Analysis: the first quick comparison with the MC simulations at 100 GeV shows a reasonable agreement for the tracker hit multiplicity (the multiplicity is larger for the data) and the energy deposited per layer in the calorimeter. No comparison is available for the ACD yet. More simulations are needed.
T9/PS run Daily Briefings - 3PM
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Communications | - Magnet failure: MNP17 colling system failure at 1AM stopped data taking for several hours but no damage on hardware. Physics restarted after 2 hours w/o silicon tagger for CAL calibrations. Magnet repaired in the morning | |
Online Report | - DAQ sync studies going on | |
Offline Report | Francesco: | |
Program | - Complete DAQ sync studies | |
Notes | - Fill elogbook | ]]></ac:plain-text-body></ac:structured-macro> |