TCS (TCS)swinkels - 10:05 Monday 19 January 2009 (21751)
Print this reportEtalon effectThe TCS experiments of Friday evening were followed by a long lock. The WI mirror must have been pretty hot, since very clear etalon fringes can be seen in alpha, beta and B8, see fig 1. Fitting a function of the form sin(exp(-t/tau)) to B8/B5 yields a time constant of 5.31 hour for the cooling down of the mirror. Note that t = 0 corresponds to the moment that step 12 was achieved, which was already 75 minutes after the shutter of the WI TCS was closed. Extrapolating back to this moment yields 5 fringes at the end of the TCS experiment, which should correspond to an average temperature increase of about 3.5 degrees according to Michele's calibration.
