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Reports until 18:35, Sunday 14 April 2013
H1 ISC
sheila.dwyer@LIGO.ORG - posted 18:35, Sunday 14 April 2013 (6079)
ALS doubling path
Kiwamu and I went into the PSL this morning, and added two irises to the ALS doubling path (labeled ALS iris 1 and 2) to use as references for the alignment into HAM1 and out onto ISCT1.  We moved the second lens in that path about 1.25 inches closer to the periscope to get the beam better collimated leaving the table.  A mode scan of the resulting beam is attached. The spacing of the measurements is small compared to the Rayleigh range, so the fitting is not great, but we have a pretty well collimated beam with a radius of 3.3 mm coming onto ISCT1 now.  We also aligned the path up o the SHG again.  For the purposes of calculating a mode matching solution, the first steering mirror is 4+1/2" from the bottom periscope mirror, the second is 18+1/2 inches away, and we have about 13 inches after the second steering mirror in which we can place the SHG.  
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