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User name Ulmer
Log entry time 14:35:57 on November 3,2002
Entry number 89509
keyword=Energy lock removed for test
The energy lock has been removed so MCC can test whether vacuum trips are related to fast feedback. This was done during run 2938. MCC assures me that they will keep the energy adjusted manually. As we watch the 1C12 X position strip chart, we see variations of order 0.2 mm (occasionally higher). With a dispersion of 4 m at this point, this implies about 0.25 MeV at 5 GeV. We were just informed by MCC that vacuum trip happened again when Hall C had the energy lock. So we will go back to Hall A energy lock now while Hall C does pedestal calibration as another test of whether Hall A is the culprit.