cheryl.vorvick@LIGO.ORG - posted 15:59, Tuesday 26 November 2013 - last comment - 12:34, Wednesday 27 November 2013(8749)
IM (aka HAM AUX, HAM-A, HAUX...) coil driver change
Coil drivers were changed for IM1, IM2, IM3, IM4, and all offsets required changes. This was complicated by choosing to do this change on the day we started pumping down the vertex, i.e. optics are moving due to pumpdown - choose comparisson times wisely. Spreadsheet attached shows times used and old and new offsets.
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Reset OSEMINF offsets to old values - changed alignment drives to recover optic positions, but we are saturating because the reduction in driver strangth is too much, and IM3 is still 300urad from it's aligned position - not good, won't work.
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For more details, see LHO aLOG 8767.