greg.grabeel@LIGO.ORG - posted 11:09, Monday 17 March 2014 - last comment - 12:47, Friday 21 March 2014(10787)
TCS Ring Heater Problems
After Travis had notified me of a problem on ETMy where the copper clamps on the ring heater were touching when it was moved into final position I went in chamber and made some adjustments to keep the upper and lower clamps separated. Decided to check if the same problem existed on ITMx and ITMy. Unfortunately, ITMy had part of its macor break while I was adjusting the copper clamps. ITMx had the glass former break sometime after it's installation onto the lower quad. Both lower ring heaters have been removed.
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[ FYI ... There is a specially designed Ring Heater Segment Replacement Fixture (D1101253), which is to be used ANY time a segment needs to be removed from a QUAD, if a dummy mass or a TM is also on the QUAD ]
Note, the ITMx unit has already been stripped of it's lowest dummy mass in prep to load the new glass mass later this week. So, the ITMx unit had extremely easy access for this RH work and no fixturing was required.
It's worse than I originally thought. The glass former broke along with the macor on the ITMy lower ring heater.
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Apparently, damage was done (also) to the very tip-end of the glass former when the adjustment was made (14-March) to the copper clamp plates of the lower RH segment (assembly D1001895-v8 SN-210) on the ITM-Y quad. This damage was not revealed until the lower segment was dis-assembled. Photos are attached.
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Regarding the lower ITM-Y assembly issues, see the attached (PDF) package of images.
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The following feedback (attached) has been received, as guidance, from SYS
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