jeffrey.kissel@LIGO.ORG - posted 18:51, Tuesday 22 July 2014 - last comment - 19:14, Wednesday 06 August 2014(12932)
Lonely, Forgotten GS13 at EX
J. Kissel, R. Schofield I discovered a lonely, forgotten, disconnected GS13 hiding under BSC9 (H1 ETMX) chamber today. I attach pictures. Things that Robert and I can surmize: - It's serial number is 574, and has a "property of the USGS, greater than $5k" sticker on the side with the number G12077 and a bar code. - It may have been used for S5/S6 feed-forward studies (Will check with Mike, Keita, Richard) - Ski may have purchased it, given the bar-code on the side (Will check with John) - It's a 2005-ish era model, based on the color of its can and unfinished look of the feet. - It's currently configured as a horizontal - It claims of a broken locking mechanism, but after a few turns the mass seemed locked enough for transport - It's functionality is unknown. Finder's keepers ...
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J. Kissel for R. McCarthy, M. Landry, K. Kawabe, R. Schofield, B. Lantz, and J. Giaime Various hazy memories have added up to a conclusion: this above mentioned GS13 was part of the S5/S6 differential feed-forward work on H1. It's pair at EY is also disconnected, but is in more "formal" storage on the wire racks in the change room / air lock before the YVEA. There're actually two on that rack, I attach pictures of both. Robert believes the other is "his," i.e. purchased with PEM dollars (though does not know which is whose). Lantz and Giaime believe the non-PEM GS13s were originally purchased for LLO's PEPI prototyping. In summary -- three GS13s, all in the horizontal configuration, serial numbers: 574 EX, under BSC9 578 EY, on cleanroom racks 584 EY, on cleanroom racks All have custom readout cables attached, with signal readouts on a BNC and power on a 4-pin lemo. 574 claims to have a broken locking mechanism, and 578 is missing it's back, adjustable leveling foot. Interestingly, the locking knob on 584 has a groove carved out of it. Perhaps this might have been used to prototype a locking mechanism (originally a part of the aLIGO design before Stanford innovated the lock-free GS13s we have today). And now you know... the rest of the story.
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J. Kissel I found *another* disconnected, unpodded GS13 sitting in the North East (+X,-Y) corner under BSC5 (H2's ETMX) chamber. His serial number is 568, and has a similar property barcode on it as the others, and it's configured as a vertical, so my guess is that each end station had an horizontal and a vertical. The EY one's are locked up, and I didn't bother checking their configuration. They're marked as "H" on the horizontal leveling feet, but that is not necessarily indicative of the configuration since they get changed and the label is oft-not updated. I attach pictures. I locked the instrument, and brought it out the change room (similar to where S/N 578 and 584 are stored at EY). This brings the collection up to: S/N Config Current Location 568 V EX, in change-room, by bench 574 V CS, In my office 578 ?? EY, on change-room racks 584 ?? EY, on change-room racks
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