Data collection for Borja's charge measurements are done (for now) -> Spun-down turbo and shut down QDP80 @ Y-end -> Valved-out IP12 @ X-end, X-end now pumped only by turbo Also, turned on BSC9 annulus ion pump (in parallel with aux. cart)
At about 23:23 PDT Aug. 27, too many testpoints were requested on H1LSC and the DAQ bit in the state word for the model was set. All test points were manually cleared at 09:40 PDT Aug. 28. The model did not need to be restarted, the DAQ state bit cleared immediately.
These 3 channels started rapidly changing sometime around 3 or 4 this morning (I'm having trouble getting data for them from dataviewer). H1:ALS-X_SPARE_A_DEMOD_RFMAX H1:ALS-X_SPARE_B_DEMOD_RFMAX H1:LSC-X_TR_A_DC_RESPONSIVITY I ran camonitor on them. Here is a snippet of the results for H1:ALS-X_SPARE_A_DEMOD_RFMAX. The others were similar. ... H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.377320 -5.47624e+66 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.387320 2.67673e-83 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.398321 7.40505e-305 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.407321 -1.97952e+288 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.417322 -4.52984e+42 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.428322 4.45211e-194 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.438323 -3.29246e+177 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.448324 4.60892e+278 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.457324 3.91205e-35 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.467325 7.40505e-305 H1:ALS-X_SPARE_A_DEMOD_RFMAX 2014-08-28 09:07:40.478325 2.06671e+235 ... I think they originate in Beckhoff. I have instructed Conlog to stop recording them for the time being by adding them to the exclude list and regenerating the channel list.
Jason to calibrate the optical lever on SR3 Peter to work on the photodiode array in the H2 PSL enclosure Jim W. running transfer functions on the ITMX ISI. Should finish around 9:30 am. Filiberto may run cables to the table at HAM6 Kyle will restart pumping at HAM6 Hugh may investigate previous issues with starting HEPI at end Y Richard may install new HEPI switches
First some background; there are two ways of installing an ADC card in the front end IO Chassis: either as a single PCIe card or as a PCIX card sitting on a PCIe adapter card. Recent ADC errors when running RCG2.9 on the IOP model for SUS EY have been resolved by Keith and Rolf as being caused by ADC/adapter cards being used in certain slots. The hope was that the installed H1 system was not using any adapted ADCs, but when I scanned all the front end IOCs I found the following front ends do indeed have cards on adapters:
h1susey (2 ADC)
h1seiex (3 ADC)
h1oaf0 (1 DAC-16bit)
During next Tuesday's maintenance, we will replace these with PCIe cards to ensure all front ends are hardware identical. We will also check the 3rd IFO IO Chassis are hardware identical to H1 and L1.
Note that the problem only occurred if a PCIX ADC was used in the very first ADC slot (ADC0). As long as a PCIe ADC was used as ADC0, both kinds of ADCs could be used in other slots. Also, we have not found any problems with DAC cards at present.
no restarts reported
We tried locking PRMI with no success. Some optics seem loud. More details will be posted later.
Dan, Kiwamu
We tried PRX, PRY, MICH and PRMI. PRMI did not lock, but the other configuration locked. Also I am worried that either ITMs or BS may be moving a lot.
(MICH)
(PRX and PRY)
(PRMI)
(ITMX mysterious oscillation in pitch)
At the beginning, we saw a quite steady oscillation in pitch of ITMX at 0.5 Hz with an amplitude of 2 urad according to the uncalibrated oplev. We suspected a hidden excitation somewhere and therefore cleared all the excitation using the diag command. This did not solve the oscillation. Then I increased the pitch damping gain by a factor of 3 to suppress the oscillation and this worked well. Setting the gain back to the nominal value (i.e. -1), I saw no ring up in pitch and the oscillation still stayed small. So I left the damping gain as nominal. Strange. Since ITMY oplev is off from the QPD, we did not check the angular motion in ITMY.
(I feel that the mirror motion is bigger than it used to be. Maybe ?)
Since the last PRMI commissioning in this winter, we have kept a couple of limiters in LSC and SUS for preventing the servos from unnecessarily kicking the optics during lock acquisition. The limiter values and their associated filters had been carefully adjusted so that they don't limit the in-lock DC values but they limit some impulsive signals. However, the limiters were limiting the in-lock feedback signal at DC when PRX(Y) or MICH was locked. I had to increase some of the limiter values by more than a factor of 5 or take them out last night.
I have not done a quantitative spectral analysis yet, but I am feeling that the motion of the suspensions are greater than before.
As for the limiter issue, we need only two limiters to be enabled, which is BS_ISCINF and PR2_M3_LOCK (see this old entry 10559). In addition, I had a wrong limiter on at LSC_PRCL last night.
Anyway, the one limiting the DC value yesterday was BS_ISCINF. This used to be 5 x105 and it was 2 x 105 in eariler yesterday for some reason. I then increased this limiter to 2 x 106 in order to avid the signal being cut at this limiter.
32 channels added
Will continue tomorrow
With Dave's help, and Hugh struggling along with me, I've set a tf to start on ITMX ISI. Should start at 12:30, some time after Kiwamu leaves tonight. It should also: pause the SEI guardian, ctrldown the ISI, undamp the ISI, set the GS-13's to low gain and bump up the watchdog threshold on the GS-13's before starting the excitation. All any commissioners need do is make sure the ISI is in its normal operating state before they leave, and not interfere with the measurement while it's running. Running from opsws0
08:40 Peter King - to H2 enclosure
08:52 Jeff/Andres - craning over X-Arm
09:01 Kiwamu - doing alignment work @ ISCT1
09:20 Fil - doing camera work in LVEA
09:49 Hugh - to Ey
10:00 Jason - starting work @SR3 op/lev
10:10 Betsy/Travis - working in West bayl
10:19 Sudarshian - to EX tiltmeter
11:11 Fil - to Ex to look at Gig-E cabling
11:23 temp loss of read access to Conlog
12:00 HFD - investigatingtrouble alarms at Ex/My
12:32 Cyrus - restarting camera servers
12:34 R McCarthy - Ey HEPI investigation
12:37 King Soft taking samples
13:16 Restarting Ey HEPI controller - Richard?
13:26 D Barker/J Batch - to Ex
13:37 Karen - @ My
13:43 Cyrus - into CER for camera/video switch
13:47 J Bartlett - to W bay rummaging for parts
13:56 R McCarthy - back from Ex
14:13 Cyrus - back from CER
14:18 P King - back to H2 enclosure
15:11 Sudarshian/Christine - to beam tube between corner and Mid y
15:35 Sudarshian/Christine - back from beam tube
When Kiwamu locked PR-X (CH16), POP_A (CH1-7) saw some decent beam, about right in PIT and off in YAW.
POP_B (CH9-15) also saw something, it's not clear if it was the real beam or some ghost, the power is about a factor of 10 smaller than POP_A, and mostly in seg1 and 2.
Anyway, the important thing is that the POP_A already see the beam and POP_B is close.
Don't use pico to center these, though, as POP sled might be a good initial alignment reference.
We should first align the IFO to the POP sled and see if it makes things better. POP sled was aligned perfectly in the last days of HIFO-X/Y. Though a beam splitter was inserted after the vent, the insertion procedure was written such that the sled centering is preserved.
The above entry is simply wrong.
When I centered these QPDs before vent, with 45dB whitening gain and with a straight-shot beam, DC sum of QPDA was something like 56 counts with a bogus calibration factor of 0.0056 that is in QPD segment filters (screen shot from before the vent, May 30).
Since then we installed 90:10 to attenuate the light by a factor of 10, but increased the PSL power by a factor of 5, so when the beam hits the QPD I expect something like 28 counts, but we got 0.4 at most, it's a factor of 70 smaller than expected.
I continued working on the PRMI alignment (see alog 13592) today and finally obtained good alignment. This should be good enough for proceeding with the next steps.
With the new alignment, the PRMI flashes without loosing the POP beam at ISCT1. In fact, one can now see PRMI fringing in the POP camera.
We are almost ready for some locking activity.
(Next steps)
(alignment)
From the experience yesterday, I learned that a combination of PR2 and PR3 did not improve the POP/PRMI alignment situation for some reason. In fact, it made the forward propagating beam hit the west side of the PR3 suspension cage. Therefore, I wanted to move the input pointing in order to introduce a translation in the cavity axis in the downstream after PR2 while keeping the POP beam angle (almost) the same. To do so, I touched IM4 in yaw. This then required re-alignment of PRM in order to maintain the beam at the REFL port. Also, every time I changed the alignment of IM4, I compensated it by steering PR2 such that I keep the POP beam at ISCT1. I repeated this process multiple times. This was successful. I could eventually obtain an alignment setting where the PRMI flashes with the POP still visible at ISCT1. The attached is the new alignment settings.
After the PRMI alignment, I re-adjusted the PR3 alignment such that the beam reaches HAM6 and ISCT6. I did not check the beam centering on the SR mirrors.
(fun locking)
Since I was running out my energy, I decided not to try the PRMI locking tonight. Instead, I locked PRX for fun. I just used REFL_A_RF45 for now. The ASAIR_LF signal was used to check if it is locked on the carrier or rf sidebands. The attached is time series of some DC signals at the AS port when locking PRX. It is locked on the carrier.
Since PR2 and PR3 are close in the Gouy phases, this combination is not very good for the prc alignment. IM4, PRM and PR2 (which is almost same as PR3 and BS in G phase) have some separations each other. A combination of these three will work.
Gerardo has just torqued down the bolts for HAM6 viewports. We're done with H1 in-chamber installation (for the current configuration)!
Congrats everyone!
Removed the Ring Heater Assembly from the ITMy quad structure going into 3IFO storage. Before starting I noticed the lower ring heater assembly had a crack in the glass former. Not sure when the break happened, but this one also displayed a lot of movement inside the ring heater shield. The pictures show how the former has pushed pretty far out of position. The ring heater cables were also removed. This includes the "antlers" (D1001755) but not the plate (D1002420) which the earthquake stop is attached to. The assemblies removed were: ASSY-D1001895-V5 #001 (lower ring heater, broken) ASSY-D1001517-V7 #612 (cable assembly) ASSY-D1001838-V6 #005 (upper ring heater)
That should read ITMx (not y) and ASSY-D1001838-V6 #002 (upper ring heater) not #005. typos.
Note, when the 40kg optics are installed and removed from the QUAD lower structures that these ring heaters are mounted to, there is some torquing of the structure (and therefore the RH). Possibly this adds to these failure modes.
One more fix. The lower ring heater should be: ASSY-D100195-108 Made a mistake with a V5 and V6 part.
