T9/PS run Daily Briefings - 3PM
Daily briefing minutes
August 21 - 13-3-005
Communications |
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Online&DAQ Report | -Interruption today between 8:30 and 17:00 because of an intervention on a magnet in the PS hall. The program on positrons and electrons at 1 GeV is essentially complete (~ 900 K for both). Alessandro has moved the second arm of the tagger at larger angle in order to get lower energy gamma-rays. . |
OfflineReport | The pipeline at SLAC is back up and there is no backlog left. Mizuno shows some simulation results concerning positron annihilation. With the current "annihilator", the probability for annihilation at 1 GeV is 1e-3. The probability for having two gamma rays with energy greater than 30 MeV is about half as low, 0.5e-4. Half of these events are actually contaminated by a bremstrahlung gamma-ray. The angle between the gamma-ray directions can help distinguish between contaminated/ pure annihilation events, the latter being associated with greater angles. |
Program | We will resume data taking with the tagger at .5 GeV when the beam is back, using different configurations, until tomorrow morning. We will then proceed with "special configuration" runs, namely using different FHE thresholds with 5 GeV electrons. |
Notes |
August 20 - 32-1-A24
Communications |
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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> |