daniel.vander-hyde@LIGO.ORG - posted 20:04, Friday 26 October 2018 - last comment - 23:31, Friday 26 October 2018(44855)
ITMY HWS sync frequency line is no longer noticeable in DARM
Rana, TVo, Danny
ITMY HWS is currently not using the HWS power supply chassis but is instead plugged into a nearby outlet via an AC adapter. After the power supply swap there appear to be no peaks in DARM associated with the HWS sync frequency set to 54 Hz and then to 50 Hz.
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the cheap AC/DC adapter we have installed is just temporary, but it seems to do the trick. Since this camera pollutes the rack power supplies so badly, we should be careful to not repeat this problem. I recommend getting higher quality AC/DC adapter for each of the Hartmann cameras (with long enough DC cords (>2 m) that the AC/DC block is not inside the optical table, and also ones that can fit in the table cable feedthroughs).