H4/SPS Daily meetings
September 15
Status: We could only run part of the night, until about 4:00 AM. Beam expected at 8:30 PM . CAL calibration with 20 GeV pions completed.
Two configurations suggested by Leon tested as well (with 150 GeV pions).
Program: 10 GeV electrons (limited number of configurations). We will stop tomorrow at 7:00 AM. The area must be cleared by 8:00 AM.
September 14
Status: Program with 20 GeV protons completed (center of tower 2: 0,45,180 deg +1 position at 90 deg 100k events). Different configurations with 200 GeV electrons used for the FIFO full issue. As of today, we are in "democratc mode", so we have lost the capability to run at the highest energies (>250 GeV). To do list related to dismantling and shipping Configurations still to do
Program: 10 GeV electrons. Completion of the scan with 20 GeV pions.
Analysis: Dave Smith looked a little at position measurements in CAL single crystals, here. Benoit had a look at the 20 GeV pion run used for CAL calibrations. There is a very good agreement between the reconstructed energy of the MIP peak and that predicted by the MC, demonstrating that pedestals or light yields/gains have not significantly drifted over time.
September 11
Status: Smooth operation most of the time, except for 3 hours in the morning. Program of different geometrical configurations completed at 20 GeV. New configurations proposed by Philippe at different energies (200,100,50,20 GeV) to study the crack effects + direct contributions from the beam almost done.
Program: Different electronic configurations to investigate the FIFO full issue. Switch to 20 GeV (10 GeV?) protons.
Analysis: Luis presented the first comparison between MC and data for the ACD distributions. The agreement seems reasonable.
September 10
Status: Smooth operation most of the time. Program of different geometrical configurations completed at 50 GeV, well along at 20 GeV. Runs with different trigger engines (internal trigger for physical events: 1 range readout, 0-suppress, external trigger for random events: 4 range readout, non 0-suppress) performed successfully to study the pedestal drift issue.
Program: Completion of 20 GeV program. Dedicated runs near cracks at 200 GeV. Switch to protons+pions tomorrow morning, when the experts are around.
Analysis: Preliminary results of the "pedestal-drift" runs (Benoit). The expected effect is clearly visible, although this is still very qualitative.
September 9
Status: Smooth operation most of the time, but for a long interruption from 4:30 to 9 AM. Program of different geometrical configurations completed at 100 GeV. Specific configurations proposed by Leon (45 deg, with particles entering the tracker sideways within the thick-converter layers) were used as well.
Program: Specific studies for the "baseline restoration" (aka "pedestal drift") problem using LATTE's muti-engine capabilities (configuration files provided by Jim Panetta). CAL pedestals, internal trigger runs. Switch to 50 GeV.
Analysis: A look at the deposited-energy distributionsmeasured in the different CAL layers (Benoit): a factor close to 90%, dependent on the layer and the bombarding energy has to be applied to the data to get a good match with the data. It is not clear if this effect is only due to non-linearity in the extrapolation of the cosmic-muon calibration to the highest energy range. Philippe showed the dependence of the measured energy on the distance to the log edge. David P. has studied the beam width, found to be much narrower in the data than in the existing simulation runs. Jan and Niklas showed results on the FHE efficiency at 200 GeV. Since the deposited energy per layer is so high, there are only few events below threshold. The measurement must be repeated at lower energy.
September 8
Status: Smooth operation most of the time. Program of different geometrical configurations completed at 280 GeV. FHE tests completed at 280 GeV (theshold=0.5 GeV-2 GeV) at 2 different positions. Cerenkov counters have been checked (there was connection problems), and are now working, although the efficiency is low.
...
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 |