E2 Line Noise Current Status

People worked in Hanford during the run

B.Coldwell: 11/06 - 11/15
S.Klimenko: 11/06 - 11/11
B.Whiting: 11/11 - 11/13

During the run we used the DMT DataViewer, DMT Fourier tool, prototype of the Line Monitor developed at UF and the Multivolt power line monitor. The following lines were present in the dark port signal (H2:LSC-AS_Q).

frequency [Hz]	width [Hz]	source
0.73 (repeatedly appeared)	-	pendulum mode
6.1	~0.5	?
12.08	0.1-0.2	RM pendulum or HAM stack
17.286	0.035(rms)	?
17.625	0.025(rms)	?
34.95	<0.05	?
31.25, 71.25, 271.25, 901.25	0.0	ITMX calibration lines
31.75, 71.75, 271.75, 901.75	0.0	ITMY calibration lines
32.25, 72.25, 272.25, 902.25	0.0	ETMX calibration lines
32.75, 72.75, 272.75, 902.75	0.0	ETMY calibration lines
53.35 (repeatedly appeared)	-	?
98.580 (repeatedly appeared)	0.04(rms)	?
98.745 (repeatedly appeared)	0.033(rms)	?
60.0 (and harmonics)	-	power lines
206.727	0.067(rms)	Periscope Structure IOO
236.90	-	?
1258.50, 1258.63	-	?
2048, 4096, 6144	0.0	Sampling artefacts
3018.30, 3027.65, 3034.40, 3040.53, 3094.20, 3053.70, 3094.40, 3114.30, 3192.10	~0.2	? (drift 0.5Hz/day)
3783.15, 3783.23, 3783.30, 3783.35	<0.05	? (drift 0.5Hz/day)
5141.70, 6929.55-6929.57 (4), 6751.55, 6751.95, 7130.50, 7133.80	~0.2	?

Bernard observed sidebands for the Y arm calibration lines (0.72Hz on both sides of the calibration peaks), that are probably exited by the pendulum motion of the Y arm test masses.
Bernard & Bob observed a line around 53.3 Hz that repeatedly appeared in the dark port signal. Please, for reference see their report.
Sergey monitored the calibration and other lines on-line running the UF Line Monitor. The variation of the calibration line amplitude (ADC channels) as a function of time (seconds) is shown here: 31 Hz, 71 Hz, 271 Hz, 901 Hz.
He also monitored (off-line) the H2:LSC-AS_Q channel for 44 hours starting at 11/09/00-09:17:47 (UTC). The results are presented in E2 LNI preliminary results.

Last update: November 30, 2000

Klimenko Sergey