From: Alan Weinstein [ajw@hep.caltech.edu] Sent: Friday, July 15, 2005 1:06 PM To: 'Alan Weinstein' Cc: 'Alan J Weinstein' Subject: DCdesign Agenda Review questions that the review committee should address questions FOR the review committee Layout optical OMC length, aspect ratio, BRDF transmission, finesse, bandwidth, 33MHz, 166MHz g-factor, ROC, HOM suppression Keita's Guoy shift balance? DCPDs Mike, Rana, Jay, Seiji, Bob, Ryan, Ben, Marcus, Steve, Osamu, David, JuLi, Rob, Virginio Layout BS: 1/3 to RF, 2/3 to DC, split into 2 DCPDs do we need 1 or 2 ISS PDs in vacuum or can we do it in air? either way, we may need to pick off more IMCT light for 19 pm offset, DC shot noise is not dominated by intensity noise if we can get < 3e-8, which @ 300 Hz, which can get in air we care about shot noise a 4kHz MMT cantilevering, weight snaking light through input MMT OMC PMC backup. Suitably vacuum-prepped (PZT glue) Design our own 4M strawman initial in-air alignment procedure 3M vs 4M - HOM degeneracy, vs polarization sensitivity wrong polarization probably carries arm imbalance signal (due to BS polarization sensitivity) which is more noise than signal mechanical mounts of all mirrors, glue only in mirror-pzt wedge input-output couplers Al is cheap ; SS is not much more, and has