KAGRA Logbook

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VIS (PRM)

yoshinori.fujii - 21:06 Thursday 13 December 2018 (7377)

PRM, BFLVDT-Glitch

= PRM =
-- It was found that BF-LVDT-H1 was measureing glitches like the attachment and the signals were fed-back for L/T/Y control.
-- After turning-off the BF-controls an waiting for a while, the BF-LVDT-H1 signal became calmed down.
-- Still it was not sure why this happened...

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yoshinori.fujii - 0:13 Friday 14 December 2018 (7386)

After a while, the glitch of BF-LVDT-H1 was found repeatedly even without the controls were on: only H1 drifted about 20 um, and then if the K1:VIS-PRM_BF_LVDTINF_H1_OUT was close to -720(un) the signal went mad.

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