Filiberto, Andres, and Jeff reconnected the cables to the feedthrough Kyle repaired. MC2 has been reconnected to the test stand and connections were verified. Andres and Jeff made minor centering adjustments to the OSEMs. MC2 is again ready for testing.
I started up the dust monitor code for the end stations and the OSB optics labs. I also burtrestored the alarm settings. This was needed after h0epics2 got restarted. Someone had already restarted the code for the dust monitors in the LVEA but the alarm settings needed to be burtrestored.
The CDS main file server cdsfs0 glitched this morning at 04:05 and put itself into readonly mode. This is the second time this has happened this week after many months since the last occurance. The other failure this week was at 16:20 Monday 10th.
The two failures are different, Monday locked the computer up completely, today we were able to log in and look at the logs. We cleanly powered it down and Jim performed the power cycle. Everything came back up and the control workstations should be operational.
here are the logs for the two events:
Sep 10 16:20:49 cdsfs0 kernel: [1167428.800898] 3w-9xxx: scsi0: ERROR: (0x06:0x0036): Response queue (large) empty failed during reset sequence.
Sep 14 04:05:36 cdsfs0 kernel: [299840.564536] 3w-9xxx: scsi0: ERROR: (0x06:0x0010): Microcontroller Error: clearing.
We expect remote transfer functions on MC2 over the weekend.
Ridiculous ergonomics pertaining to the center-north flange that was R&Rd significantly limited my ability to do a decent job on the chamber flange (predict 50/50 chance of having to revisit this "leaker"). After several hours of fighting the numerous obstacles, I finally unbolted the dial-indicator "trees" that monitor the support tube motions. Sorry Seismic. Unfortunately, this was mostly after the fact.
We have taken the Phase 1b transfer functions and power spectra for H1-PRM. The files from 09/06 are for undamped Transfer functions. The files from 09/10 are for damped Transfer functions. The files from 09/13 are for the damped and undamped power spectra.
For a comparison of all Phase 1b HSTS M1-M1 transfer functions obtained so far, for both LLO & LHO, see plots below:- - allhstss_2012-09-13_2100_All_Phase1b_HSTSs_ALL_TFs.pdf - allhstss_2012-09-13_2100_All_Phase1b_HSTSs_ALL_ZOOMED_TFs.pdf Also, I noted that one of the power spectra plots was missing:- - 2012-09-13_1230_X1SUSPRM_M1_ALL_Spectra.pdf
Ken worked at getting an appropriate power supply for the compressor first thing this morning.(Thanks, Richard.) The Apollo crew went into the beamtube to vacuum up all the mess (visible particulate, fibers, metal fines)from the gate valve to the BSC body. Once that task was accomplished,the dust barrier was installed and brushing commenced. About 70% of the collar was brushed by the end of the day.
Scott & Hugh The first layer of D0901075 mass was positioned (9 pieces on the west, north & south sides) and bolted down sometime ago per D1000907-v1. I didn't add the second layer so as to improve the access for cable routing and other work. The six stacks (12 pieces-120kg) have not been added to the east side of the ISI table. Today we put the second layer, another 90kg, on to the first layer of positioned stacks. These are secured with final fasteners. See the attached photo for a view from the west. With the go ahead, I'd like to get the rest of the payload in position asap but only if it won't interfere with Aux/IO work.
fire alarm testing in morning ~9:40 - three times for good measure! contractor on-site for Richard M fire dept at 1:15 Rodney at Mid-Y ~10:30. later to End-Y ~1:00 with the use of both roll-up doors Eric A. at End-Y ~3:00 Ops tutorial led by Dave B. ~2:00
[Jax, Aidan, Thomas]
I've run an initial analysis on the cavity scan data from last night. The setup was as follows.
1. Cavity scans were run every 90s or so. We scanned over the range [36,56] kHz every 20Hz. The amplitude and phase response of the injected frequencies were averaged over 1000 oscillations.
2. After 10 minutes of cavity scanning, we started the ETM RH at 3.255W per segment (or a requested power of 315mA)
3. The cavity scans were left running for 15 hours or so before we switched off the RH.
4. The frequency of the LG10 mode was determined for each cavity scan. The attached plot shows the frequency shift of this mode vs time. The LG10 mode shifts by 2x the HOM spacing.
Notes
(a) the WFS feedback coupled with the thermal lensing started to drive the cavity away from resonance after ~2hrs of heating. We lost lock and spent about an hour trying to recover. Hence there is no data shown from [t=2hr to t=3hr];
(b) I've also plotted the COMSOL estimate of the frequency shift for 6.5W of heating. The model predicts a frequency shift ~90% of the size of what we measured.
(c) For reference, change in the ROC is ~76m/kHz * the change in frequency of the LG10 mode (or delta ROC = 151m/kHz * the change in the HOM spacing).
h0epics2 ground to a halt yesterday with 0% cpu idle time. I restarted it and as of now it is still nicely at 98% idle.
The FMCS PC was reconfigured yesterday presumably by the vendor, its network firewall was strengthened which prevented the FMCS EPICS IOC (h0epics2) from accessing the PCs web pages.
I reconfigured the WIN7 inbound rules to allow access to the HTTP port on the FMCS PC and restored the EPICS connection.
Ring heaters didn't turn off as intended. Instead they were turned off at about 9 am and I continued the cavity scan until noon to watch the ETM cool down. The CMA excitation B is now off.
WP3443
Late entry for change made Tues 09:29 local time. The IOP model h1iopsush2a was changed to switch the watchdog trigger from PR3 to MC1. Since MC1 top OSEM is correctly centered, this allows the IOP DACKILL to be disabled, permitting chamber side testing of MC1.
SVN: h1iopsush2a.mdl version r3009.
Disconnected the SRS cables and in air cables on the suspension feedthrough in Ham-3 so Kyle can fix a leak. Sus will reconnect the cables when the feedthrough has been reinstalled.
The SEI Cables from ISI corners 1 & 3 were also disconnected from flanges D1 & D2. The SUS flange is D6.
Found the IOP model cycle time was consistently too long, so I needed to kill the x1isiitmx model, restart the x1iop model, then start the x1isiitmx model. I did NOT do a burt restore, I'll leave that up to the user who is setting up a new test.
[Stuart A, Jim B, Jeff B] On Tuesday of this week Jeff B attempted to take power spectra using the "plothsts_spectra.m" script (/susSVN/sus/trunk/HSTS/Common/MatlabTools), as part of Phase 1b testing of the PRM (HSTS) suspension. The script running on the Triple Test Stand failed to extract results from data frames and had to be aborted. I confirmed that the frame-builder was up and running, and that the correct channels were present. On further inspection I discovered that Dataviewer would only provide real-time data, and could *not* extract data from the frames, even after a number of frame-builder restarts. I raised this issue with Jim B, who was able to troubleshoot that this was due to the nds process not running on the test stand, and he was not sure of why or when it failed. However, this has now been rectified. This morning I have remotely logged-on to the Triple Test Stand and have been successful extracting frame data with Dataviewer. I also noticed that the x1sushxts05 model had been restarted, but that the medm screens had not been restored. So I have restored a snapshot that I took yesterday "20120911_x1sushxts05_PRM.snap" (/opt/rtcds3/tst/x1/cds_user_apps/trunk/sus/x1/burtfiles) to ensure that Phase 1b testing can continue on PRM.
I am still running TFs on HAM3 MC2 today unless someone states a need for this suspesnion system. Email me if so.
Luke, Cheryl, Rodica
This morning I checked the forward rotation after the heat sink connection last night, and reoptimized slightly by adjusting the position of the single TGG holder inside the magnet. Once re-optimized, the rotation stayed within 0.2 deg from optimim (value determined by measurement uncertainties). This was verifed for powers between 27 mW and 470 mW.
I also looked for ghost beams from the 10 surfaces of the optics assembled in the Faraday so far. Four strong AR beams seem to come from TGG and QR, two being just slightly weaker probably from QR. These rest on the periscope mount and clip on the barrel of the bottom mirror and will need to be properly routed and dumped. Also strong AR from CWP2 - one beam rests on the magnet case, another on DKDP mount. Since we don't have yet the SiC hard apertures to catch all these beams, we need to make sure they are properly routed to dumps before increasing the power. Will continue the hunting tomorrow.
Cheryl and I tested the HWP and DKDP retaining rings for smooth rotation turning them back and forth under IPA flow and wiping the metal dust away every time. Once deemed acceptable we mounted the HWP. Upon initial inspection, the two 3 mm thick DKDP crystals show an elevated density of central 'dots' that did not blow away, one significantly heavier than the other. We applied First Contact on the worst looking of the two in an attempt to remove them. This is the last optic that needs to be added to the assembly.
Luke re-assembled the picomotor rotatable HWP mount so that it rotates freely. It needs to sit on the flow bench overnight so that the IPA can evaporate out of it. In the morning he plans to do one last test on it to make sure that it still rotates without IPA, and then we can install it to the breadboard.
