Reports until 12:53, Sunday 06 November 2016
H1 PEM
robert.schofield@LIGO.ORG - posted 12:53, Sunday 06 November 2016 (31261)
Black glass at ETM port study

I studied the effect of black glass in the manifold ports at Y-end, comparing black glass in all six ports to no blocks in any port. I compared both with no injection, Figure 1, and with an acoustic injection that excited scattering peaks normally a little below the DARM floor, Figure 2. No effect was seen. I didn’t have time to do the complete multi-port study at X-end, but I had to excite more there to bring up scattering peaks, so I think there is somewhat less of a potential problem there. I left one of the new black glass blades in the Pcal camera port at each end station, though I had found no evidence of a problem at either station.

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