Danny, Kara, TVo

Danny had come in today and the ISC_LOCK guardian was in error mode (red box) at OFFLOAD_DRMI_ASC.  This was mostly due to implementing a lscparams.asc_gains dictionary in ISC_LOCK, nothing major in the logic just a few typos and ISC_LOCK was calling the parameters this way: lscparams.asc_gains.key1.key2.key3 but we changed it to scparams.asc_gains[ 'key1' ][  'key2' ][ 'key3' ].  This was true for a few other loop engagements so we changed those as well to be consistent. 

Then we tried to go up to Nominal Low Noise but was still plagued by some DHARD instabilities at approximately 4 Hz, this continued even when playing with the gains a bit to stay away from the instabilities mentioned in Jenne's aLOG.  This is particularly hard wrangle with because there's a lot of zero crossings...

So we decided to try to test the SR3 heater to see if it changes any of the interferometer build-ups, but because we couldn't get to low noise we weren't able to test what happens to the DARM cavity pole.  We tried to see if the coherence between the 9 MHz HOM mode and the OMC_Trans would also change but without going to a low-noise configuration, the coherence between OMC_A_NSUM and OMC_DCPD_SUM was unsurprisingly dominated by other noise.  Attached is a trend of some of the buildups after getting to 30 watts and turning up the SR3 heater.  There isn't much going on in the way of improvement except for a slight bump in POP18 at -15000 seconds.  We stayed lock with all ASC loops closed at high bandwidth.  As I write this aLOG, I think the 72Mhz signal would be the most sensitive to this so maybe we should have injected a line to SRM to measure the response...

We were stable for a few hours and then a timing error on H1IOPSEIH45 crashed the ISI and HEPI, so we phoned Dave and brought them back with a startWorld.sh reboot.  However, the AS port camera looked very misaligned after coming back so we has to re-align quite a bit.  Leaving it locked at 30 Watts in high bandwidth.