Doug working on optical lever for SR3 HAM6 fine alignment waiting for vacuum tiltmeter hardware installed, analyzing data charging measurements moving to end X B & K hammering at end X
Pressure still at 0.77 Torr. Roughing valves opened at 0730.
no restarts reported
Entry by Kyle
T. MacDonald, J. Kissel Initial measurements of the H1EX piers and floor were taken on 8-15-14 to establish that the B&K system and accelerometers were functioning as expected. These were done with a B&K 4506 accelerometer on each north edge of the top of north side piers, and another on the north side of the chamber about 5 ft from the top. The B&K 8340 accelerometer was centered under the beam tube and 1 ft north of the center line between the north piers. During these measurements, no features were found near 8 Hz. There were some concerns about the coherence of the 4506 accelerometers at 8 Hz, which was generally below 0.5. The 8340 accelerometer coherence was much better, so on 8-16-15 it was mounted on the top of the northeast pier next to one of the 4506s. Measurements were taken again at several points on the ground and the pier, with still no features at 8 Hz. However, an impact on the crossbeam showed a clear feature in the frequency response at 8 Hz. To characterize this response, a full set of measurements was taken around the floor and along the pier and crossbeam. Results were consistent and key measurements are outlined. Full results and files are also available on the SVN at https://svn.ligo.caltech.edu/svn/seismic/Common/PierMotionStudy/EXH1/20140816. Following these measurements, the 8340 was moved to the crossbeam and a measurement sequence covering the full north side was created to examine floor motion and mode shapes of the structure. These measurements were completed and further analysis will follow. More extensive measurements of all four piers will also be completed.
no restarts reported
model restarts logged for Fri 15/Aug/2014
2014_08_15 13:20 h1iopsusauxex
2014_08_15 13:20 h1susauxex
2014_08_15 14:06 h1ioppemmx
2014_08_15 14:09 h1ioppemmx
2014_08_15 14:21 h1ioppemmx
2014_08_15 14:22 h1ioppemmx
2014_08_15 14:23 h1ioppemmx
2014_08_15 14:25 h1ioppemmx
2014_08_15 14:27 h1pemmx
2014_08_15 15:12 h1ioppemmx
2014_08_15 15:13 h1ioppemmx
2014_08_15 15:15 h1ioppemmx
2014_08_15 15:17 h1ioppemmx
2014_08_15 15:20 h1ioppemmx
2014_08_15 15:21 h1ioppemmx
2014_08_15 15:21 h1pemmx
2014_08_15 15:22 h1pemmx
no unexpected restarts. Recovery of h1susauxex after power outage, testing channel access parts in rcg2.8.5 on h1pemmx.
J. Kissel, T. MacDonald We've whacked on the HEPI piers and surround floor some more today. We think we finally have a good combination of hit locations, hit strengths, and accelerometer locations that we're measuring the real flagpole motion of the pier at 8 [Hz]. Lots of plots, data, and analysis to come (as we know it's torturous to get data off the B&K system). Glancing at the rotation sensor signal, we found it had rung up to +/- 500 [nrad] during our activity and a visit by Robert, so we did the gravity dance a little bit, such that it now is moving +/- 250 -- Krishna is much better than us at this. We've left the end station as of 2014-08-17 8:00p PDT, or 2014-08-17 03:00 UTC.
The dance is easy once you anticipate your partner (the balance). Just takes a bit of practice :)
After roughly 10 hours of pumping we reached a pressure of 20 Torrs.
Alarm handler was complaining about LVEA dust monitor 2 and 5.
In the attached 2-days plot, I see nothing today that was larger than on Friday, except there was a one time glitch for dust monitor 5 at around 6AM today which immediately got back to zero-ish, so I acknowledged both of the alarms.
J. Kissel, K. Venkateswara Krishna and I completed the installation of the H1 EX Beam Rotation sensor today by inserting the analysis laptop's output (via a USB DAC NI-6343). The tilt signal channel, H1:ISI-GND_BRS_ETMX_RY_OUT_DQ (fs = 256 [Hz]) is filtered to produce a calibrated tilt signal in [nrad]. Pictures and data to come! Raw data is output with a very-low frequency high-pass to limit the range of what goes into the ADC 2 zeros @ 0 [Hz], 2 poles @ 1 [mHz] Once in the aLIGO DAQ, there are two calibration filters, FM1 Rotation sensor gain calibration Filter File: /opt/rtcds/userapps/release/isi/h1/filterfiles/H1ISIETMX.txt Filter Bank: (FM1) H1:ISI-GND_BRS_ETMX_RY_Name00 Filter Name: "ct2nrad" 3.5e-6 [rad/pixel] * 1 [pixels/V_sing] * 1/2 [V_sing / V_diff] * 40/2^16 [V_diff/ct] * 1e9 [nrad/rad] = 1.0681 [nrad/ct] FM2 Rotation sensor pendulum response inversion Filter File: /opt/rtcds/userapps/release/isi/h1/filterfiles/H1ISIETMX.txt Filter Bank: (FM1) H1:ISI-GND_BRS_ETMX_RY_Name00 Filter Name: "ct2nrad" 2 complex zeros at 8.8 [mHz], with a Q of 100 2 poles at 0.001 [Hz] to roll off inversion Normalized to 1 at high frequency zpk([4.4e-05+i*0.00879989;4.4e-05-i*0.00879989],[0.001;0.001],1,"n")gain(77.4401)
G. Moreno, K. Ryan, B. Sorazu, J. Worden, R. Weiss Please look at the attached document. It is also in the DCC as T1400535
Jeff K., Krishna V. The tilt transfer function measurements were yielding inconsistent results and ultimately I decided that the error bars on the measurement are much larger than previously anticipated. The main reason is that I dont have a simple way of producing pure tilt on the platform, therefore cross-couplings are preventing few percent level accuracy on the transfer function measurement needed to measure d to better than ~ +/- 5 microns. Based on the GRND_T240 comparison, and the average of the transfer function measurements, we have reason to believe that the displacement rejection is better than 1E-4, which I decided was sufficient for now. Once plugged in to the LIGO DAQ, there may be other ways of estimating "d". In the afternoon, I added multiple layers of aluminum foil and foam insulation to the vacuum can and the autocollimator. I then tried to turn the Ion pump on. To describe the problem, let me briefly summarize the pumping arrangement: Vacuum can --> Valve 1 --> Ion pump --> Valve 2 --> Temporary pumping station (Turbo). The pressure at the Turbo was about 5E-7 torr. The Ion pump turned on just fine and the current dropped down to <0.1 mA in minutes. I then closed Valve 2. The current went up to ~ 3 mA and then started going back down. SO far so good. I then turned the Turbo off and the current started rising! Valve 2 was leaking through flanges (not to outside), which was a surprise. I tested it again and same result. Luckily, I was able to find a replacement valve very easily at the corner station. I closed Valve 1 and replaced Valve 2. I then pumped overnight with the Turbo. On Saturday morning, I turned on the Ion pump and closed Valve 2. This time the current went up to 3 mA but then went down normally and did not rise when the Turbo was turned off. Whew! The current after an hour of pumping was 0.5 mA. Overnight, I also took a ringdown Q measurement for the balance beam. The first plot shows the ringdown over 40k seconds. A second plot shows a zoomed in view. The log(Amplitude) is mostly flat but tends to get better at late times which was probably just due to the improving pressure. A straight line fit to the log(Amp) gives a Q of ~4800 and since the resonance frequency is 8.8 mHz, this gives a damping/decay time of 173k seconds or ~ 2 days!
We're starting from HVE-LY:Y2_180ATORR = 450 torr.
THX
While doing charge measurements I noticed that the power supply to the ESD was off I went to the end station Y to check it and I turned it back on (recalling setting 01 on the power supplies as per instruction given few days back). Later I turned the ESD HV amplifier On (as per previous instructions) and verified insitu that it was not railing. It is working fine now.
Notice also that the ESD LL quadrant cable is back to the proper configuration so at the moment LL quadrant cable is going directly from the resistor box to the feedthrough while BIAS is going through the ESD LP filer box. This was done at about UTC 2014-08-15 23:00:00 and after doing this we verified that the ESD was not railing and that we were able to drive the quadrants so I do not believe it is related with the ESD power supplies turning off. Maybe another power glitch?
At about UTC 2014-08-16 05:00:00 the ESD power supply at ETMY was switched off again no idea what is turning off the power supplies because ESD at ETMX is working fine.
Jeff K. and Tim left ETMX station at UTC 2014-08-16 03:00:00.
