thomas.vo@LIGO.ORG - posted 21:27, Wednesday 11 July 2012 - last comment - 11:50, Thursday 12 July 2012(3414)
Enclosure Installation Update
Thomas V. Mark D.(Apollo) John W. Gerardo M. We have finished installing the enclosures for ITMY and ETMY. During installation, ETMY was misaligned and I mistakenly re-aligned to the reaction mass ghost beam, will fix to reflect off the ETM. ITMY is fully operational, some internal focusing of the telescope may need to take place since the beam diameter is approximately 8 mm, spec calls for 2-3 mm. However, it is up to the commissioners of the OAT whether or not this adjustment is worth doing. Deviations from design: 1) Due to the tightness between the ITMY transmitter pier and the viewport, we were only able to get the viewport protector in between them and couple the enclosure to the protector via sheet metal and tape. 2) It was also pretty tight between the viewport protector and the enclosure on the ETMY receiver pier, we were not able to fit a full sized bellow to couple the connection between the two. We ended up cutting the bellow to a smaller size and using that. Also, we adjusted the level of the receiver pier in order to not have the enclosure touch the beam tube (the corner of the enclosure was butting up against the side before).
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Editorial note:
I assume this entry refers to the enclosures around the optical lever beams for ITMY and ETMY, though nowhere in the entry is the term 'optical lever' (or any of its derivatives) found. This makes the entry rather abstruse, and it also means that if one searched the log for optical levers, oplevs, optlevs, etc, one would not find this record.
Technical note:
If the design calls for the beam size to be adjusted to be 2-3 mm (radius? diameter?) on the detector, it should be adjusted to that. The optical lever isn't really considered to be installed until that is true.