jeffrey.kissel@LIGO.ORG - posted 08:13, Thursday 22 January 2015 - last comment - 09:07, Thursday 22 January 2015(16200)
H1 ISIs Set to '750mHz' and 'Start' Blend Filters, with ISI and HPI Sensor Correction OFF for Gain Matching
J. Kissel, A. Pele In order to gather measurement data for GND to ST1 sensor correction, I've switched all chamber's ISIs except for HAMs 4-6 to a high-frequency blend. For the HAMs this means the "750mHz" blends, and for the BSCs the "Start" filters (see attached) and turned both ISI X&Y and HEPI Z sensor correction OFF. Yesterday, worried that there still might be residual garbage from initial install in these filter banks, we've confirmed that all chambers involved have the same filters as attached. The chambers have been set up in this fashion since 1105975887 Jan 22 2015 15:31:11 UTC (We blends switched by done by 15:05 UTC and 15:22 UTC in the HAMs and BSCs, respectively, but I forgot to turn OFF the sensor correction until Arnaud reminded).
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BSCs and HAMs have been restored as of: 1105980152 Jan 22 2015 16:42:16 UTC XARM Restored 1105981034 Jan 22 2015 16:56:58 UTC YARM / BS Restored 1105981219 Jan 22 2015 17:00:03 UTC HAM23 restored