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User name J. Wexler
Log entry time 08:00:38 on August27,2009
Entry number 286225
keyword=Shift Summary - Owl 8/27
Shift summary for the owl shift, 8/27
12AM - No beam, still in controlled access.
2:20 - DAQ issue solved on the Moller expt., going to beam permit.
2:50 - An issue arose with the one of the magnets. We request access to assess the issue.
3:20 - Magnets still broken, expert is called in to fix magnet.
4:20 - The magnet is repaired, we're going to beam permit and ramping the spectrometer magnets.
5:30 - We're preparing the thick tantalum target, going through the MCC plan to give us 60+ uA on the target in order to test lumi noise, and then check the corners of a 2mm x 2mm area.
6:00 - Multiple changes between empty, tantalum, and BeO targets occured in the MCC plan to get the current.
6:20 - Started the putting 10 uA beam on thick tantalum.
6:35 - Up to 70 uA. Begin looking at lumi noise
6:50 - In the name of letting the target cool, we've gone back to 5 uA.
7:15 - We called the MCC, asking if they can ramp the current above 70 uA in order to see the effect on lumi noise.
7:25 - MCC can't stably reach above 65 uA due to issues on their end. We reduce the current to 10uA.