aLIGO LHO Logbook

H1 COC

betsy.weaver@LIGO.ORG - posted 15:32, Wednesday 11 January 2012 - last comment - 14:51, Friday 08 May 2015(2018)

QUAD Glass Mass measured weights

For the record, following are the measured weights of the QUAD glass penultimate masses (PUM) and test masses that are currently here at LHO.  Most of this data can also be found on the CIT optics Nebula we page.  Note the labels of the masses are slightly confusing as the optics have been coated specifically for the one-arm.

MASS     LABEL              INSTALL LOCATION
39,653g ETM02 (TM)    BSC8 ITMy
Didn't measure ITMy PUM because it was the first mass bonded and we were not wise to the need for weights.
39,626g ETM04 (PUM) BSC6 ITMy PUM
39,689g D050421-001 BSC6 ETMy PUM (was lasti mass)
39,613g ETM04 (PUM) 
39,641g ETM05 (PUM)
39,633g ITM01 (PUM)
39,621g ETM03 (PUM)

Comments related to this report

betsy.weaver@LIGO.ORG - 23:30, Friday 13 January 2012 (2046)

Link

We found more weight numbers and I made a typo in my original alog.  The correct table is this:

MASS     LABEL        INSTALL LOCATION
39,653g  ETM02 (TM)   BSC8 ITMy
39,583g  ITM04 (PUM)  BSC8 ITMy PUM
39,626g* ETM04        BSC6 ETMy
39,689g  D050421-001  BSC6 ETMy PUM (was lasti mass)
39,613g  ETM04 (PUM)
39,641g  ETM05 (PUM)
39,633g  ITM01 (PUM)
39,621g  ETM03 (PUM "holy mass" has extra ground recesses) 
39,650g  ITM08 (PUM)
39,616g  ITM05 (PUM)

* Mass weighed with ears/prisms after binding/curing.

- Bland, Barton, Moreno

betsy.weaver@LIGO.ORG - 14:51, Friday 08 May 2015 (18330)

Link

I have reason to doubt the weight listed for ETM02 "TM" - I do not know where this number came from.