kyle.ryan@LIGO.ORG - posted 09:24, Monday 07 January 2013 (5038)
HAM2-HAM3 pumpdown
0900 hrs. local 1.7 x 10-6 torr @ turbo inlet
0900 hrs. local 1.7 x 10-6 torr @ turbo inlet
BSC 3 now has its HEPI housing installed and locked in place. The blue-iron brackets are still in place for now but will be moved to BSC 8 for swapping back in the iLIGO stacks. The hydraulic actuators on BSC 8 will also be moved over to BSC 3. One bolt had galled on BSC 8 horizontal actuator but was cut out. After removal the HEPI foot will need to be fixed.
This morning I relocked the HEPI elements after yesterday's L4-C replacement. As I said yesterday, there was motion when I unlocked but after putting the motion into Global Coordinates, the motion suggest these were just strains put into the system when it was locked. There has been a lot of activity at the HAMs between Dial Indicator removal and IPS coming on line. So, I look forward to hearing from IO that the Mode Cleaner is still flashing. The Global Coordinate shift is 15urad and the average translations are less than 0.1mm after everything is replaced and relocked. The shift from floating to locked is much less than these numbers. I did not zero out these readings as I did on HAM2 alog5018. The Pier3 Horizontal Actuator may need adjustment; I'll wait to zero HAM3 until that is complete.
Mark B. Preparing for undamped and damped Matlab TFs on the BS. "Measurement Status" indicator on the MEDM screen should go on automatically when underway and off when done.
Mark B. The measurement attempt finished on schedule but was a disaster from the point of view of results: the script consistently failed to read data from NDS, even after 25 attempts for each drive segment. This is reminiscent of an old bug that Stuart worked to fix and indeed the same script worked for MC2 the other night. Debugging continues.
Restarted the daqd process on h1broadcast0. Prior to doing this, David Barker revised it's broadcaster.ini file to specify the list of channels requested by John Zweizig, and modified the daqdrc file to cause the daqd process to read the broadcaster.ini file. The date on the h1broadcast0 machine is Jan. 1, although the time of day is correct. This will be corrected.
Yesterday, the two remaining spool pieces were moved into the cleanroom. One spool was attached to BSC9 and a second spool added to fill in the gap between BSC9 and BSC5. Since BSC5 already had a spool piece attached, it was possible to marry the three spool pieces and complete the beam tube between the chambers.
Yesterday, the C-3 soft roof was pulled from HAM3 and installed on the cleanroom over HAM6.
Sloooowww vent is done -> As such, I connected the HAM6 vent/purge connection and cracked it open -> Now the YBM vent/purge is connected with its valve partially open and the HAM6 vent/purge is connected with its valve partially open -> Purge-air air currents across the ITM (real or imagined) can thus be manipulated to compensate for the 1st component to be removed (YBM spool, or HAM6 door)
1730 hrs. local 1.9 x 10-6 torr @ turbo inlet -> Foreline @ 3.7 x 10-3 torr
The non-functioning Horizontal L4-C L41659 on Pier2(SW) was replaced with L41366. While at it I 'leveled' the L4-C based on its clamping bracket D030586 but other data suggest that may only possibly help. This required about 0.09" of shim although this isn't the amount of out-of-level due to geometry. I've left the HEPI system on WHAM3 unlocked; I want to see if there is any slow creep of the system while free. I'll lock it up in the morning and then summarize the numbers--yes there were some shifts from locked HEPI to unlocked position.
As of 4:00 PM local today, the vacuum level at BSC 8 = 720 torr and at BSC 2 = 660 torr. Richard replaced the power supply for the LVEA test stand sus IO chassis and Jim did some reboots to restore the system, which appears to be running satisfactorily. Flooring installation is underway at EY. Seismic's replacement of the HAM3 HEPI L4C appears to have worked. Michael R and Kiwamu worked on PSL RF during the day. Apparently tumbleweed baling has continued throughout the day. Work permits signed by ops today: 3625 (Hugh, HEPI L4C), 3626 (Thomas Vo, oplev removal), 3627 (Filiberto, HAM1/HAM2 cable re-routing), 3628 (Apollo, EY crane support of clean room during flooring installation).
Mark B. Taking TFs on MC2 from 12:45 pm.
Mark B. Undamped and damped TFs completed overnight. Undamped: /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Data/2013-01-03-1041282012_H1SUSMC2_M1_0p01to50Hz_tf.mat Damped: /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Data/2013-01-03-1041300220_H1SUSMC2_M1_0p01to50Hz_tf.mat In the undamped data there's a dropout in the L data below 0.5 Hz, but everything else is good and the suspension looks in good shape. All the damped data is good, but the suspension looks horribly overdamped in Y and P, and the gains need to be checked.
I let Michael R know that the NPRO is off. H1:PSL_AMP_ENABLEPWRDOG was alarming this morning.
The power watchdog on the frontend tripped last night, shutting down the laser. This appears to be due to a change in humidity affecting the pickoff power, as we have seen before. The laser power recorded by AMP_PWR3 read 91% when the watchdog was turned on, and decreased by 15% to 77% to trip the power watchdog. The power recorded by OSC_PD_AMP_DC_OUTPUT had decreased by about 250mW during this time, or 0.8%
The laser is still off as we try to move over to the final RF configuration.
This is just a record for those who care about the slow machine h1ecatc1.
I was playing with h1ecatc1 this evening around 18:10. I got an error message when I tried logging in PLC2. The message said 'Page Fault. PLC is stopped.' Obviously PLC2 wasn't running, so I recovered it by clicking the 'reset' button in the 'online' tab and then clicking the 'run' button. It seems running OK right now.
I ran a quick test today on IM3, which now has the largest offsets of the 4 HAM AUXs. In the attached plot, red shows the pitch offset, black the yaw offset - blue shows very different behavior when each offset it removed - the damping of the oscillation when the pitch offset is removed shows the optic is touching an EQ stop. I left all HAM AUXs, IM1, IM2, IM3, and IM4, undamped overnight.
Please keep in mind that the Eddy Current Dampers coupling with pitch is _much_ stronger than that with yaw, so I would't considere the different decay rates as evidence of rubbing.
If rubbing is indeed suspected, I would suggest to check by either running a full set of TF and looking for anomalies, or trying a (small) DC actuation of pitch and yaw in both direction and looking for asymmetries in the displacement measured by the OSEMs.
Thomas and Cheryl Morning status: Alarms: Dust, LVEA 2, 13, and EY 1 invalid - I reset the ignore on all 3, since no dust monitors are connected IOP SUS watchdog, ITMY - OSEM4 yellow PSL, laser OSC_XchilAlarm, ENV, TEMP_Humidity - cleared up Activities: - Table optics install at input arm - BSC2 transfer functions - In-chamber cleaning at EX - Tumbleweed cleanup - Praxair delivery, 10:04, CP-4 - Vent of BSC1/2/3 and HAM4/5/6 - Optics tables moved into squeezer area in LVEA - Test stand computer issues
