Attached are the weak heating curves from tonight.

Ring heater turned on: 09:13:39 UTC  (2014/02/04), with a POP18 of about 4050cts
Lensing maximum occurs at 11:31 with an error of about +-5min , with a POP18 of about 7850cts

I.e. the turn-on to peak-lensing time interval is 2h:28min, or about 8880sec.

For later reference, the POP18, 33min into the run was about 4450cts


We will leave the heater on today (at 1.5Watt total) to the long-term equilibrium lensing. From that we can establish the time during initial heating which has the same lensing as the long-term equilibrium. This will allow us to simplify setting the power.

See also alogs
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=9778
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=9736

As reference, in alog 9736 we had
Start heating 08:09 UTC and 3500 cts PP18 build-up
Ideal matching at 08:42 UTC, with 11500cts POP18 build-up.
That's 0h33min into the run (1980sec). That was with 20W total.


Based on these numbers I would expect a heating power of 1.5