The input pointing of PRM oplev beam was streered just a touch to remove clipping from it's return.
The spots did not move visibly on these two lenses. The spot diameter on the qpd is ~1.5 mm, 65 micro W and 3440 counts.
Y arm green: Nothing much was disturbed. I touched the steering mirrors and brought GTRY from 0.2 to 0.9.
X arm green: The PDH lock was not very stable mostly because of the low power in green. I changed the oven temperature for the doubler to 36.4 corresponding to maximum green power. GTRX increased from 0.1 to 0.9
Both the X and Y arm green alignment were tuned on the PSL table to their respective beat PDs.
The PSL green shutter was not responding to the medm buttons. I found the PSL green shutter set to 'local' and 'N.O' (these are switches in the shutter controller). I do not see any elog and not sure as to why the controller was even touched in the first place. I set the shutter controls to 'remote' and 'N.C'.
ETMX green power at shutter 3.6 mW at 36.35 C doubler crystal temp. [ Innolight IR settings 2.0 A, 40.83 C, 500 mW before Faraday 1/2 plate ]
ETMY green power at shutter 0.75 mW at 35.8 C doubler crytal temp. [ NPRO IR settings 1.82A, 231 mW_ display, DT 21 C, DTEC +1V, LT 40 C, LTEC 0.1V, T +41.041 ]
The floor was cleaned under the east arm tube with hand held wet towel. We moved staff around and mopped. I did at the bottom of rack 1Y1, 2 and 3.
Last week we did the south arm tube floor.
Next week we 'd like to clean under rack 1X1,2,3, 4, 5, 6 and 7
1Y4, 1X1,2,3,4 & 5 instrument racks floor space were cleaned.
Alex, Gautam and Steve,
Single mode fiber 50m long is layed out into cable tray that is attached to the beam tube of the Y arm.
It goes from ETMY to PSL enclosure. It is protected at both ends with " clear- pvc, slit corrugated loom tubing " 1.5" ID
The fiber is not protected between 1Y1 and 1Y4
The X -arm fiber is in the high cable tray and it has has coupler mounts.
The Y -arm fiber is in the low cable tray and it has no coupler mounts.
The fibers are only protected at entering and exiting the trays.
We have only 68 ft spare 1.5" ID protective plastic tubing.
The MC is happy (but only for this tiny snapshot in time and most probably will go dysfunctional again as it has been for several months, as of this writing)
1X6, 1X7 and 1X9 instrument racks floor space were cleaned today
The IMC has not been behaving well since this morning and totally not happy when Q was finishing his measurements. The WFS servo had large offsets in pitch. Looking back at the trend and using ezcaservo to restore the suspensions did not help.
I realigned the IMC and brought TRANS SUM to ~18000 and MCREFL to < 0.5. The spot positions are not very good; nearly 2 mm off in pitch on MC1 and MC3. But after the alignment of MC, the WFS servo offsets were below +/-20.
The MC has been locked stably with WFS servo ON for the last few hours.
P.S. I did not touch the WFS pointing or reset the WFS offsets.
Valve configuration: Vacuum Normal is reached in really 4 days if we do not count overnight rest of roughing.
VA6 and VC2 are reconnected. I'm turning on the RGA next
All 4 ion pumps were vented with air and pumped down to ~ 1e-4 Torr
Ion pumps gate valve control cables are connected and their pumps are disconnected.
The black relay box was tested repeatedly and it stopped misbehaiving.
We were at atmosphere for 13 days. Chamber BS, ITMX, ITMY and ETMY were opened.
Al foil "cups" were placed on the back side OSEMs of PRM.
Pd 76 and 77 are compared at 30 days of pumping. We spend 13-14 days at atmosphere before each.
Pump down 76 was with leaky ion pump gate valve. The ion pumps are not in use for years so they accumulated some higher pressure PLUS the valve switching caos at computer reboot most likely
increased the ion pumps pressures to about 10-20 torr
I think one of the ion pump gate valve was not sealing well. This leak was holding back pump down speed at pd76
It looks like that ETMX have 2 sticky magnets.
It was little bit surprising to me but Rana's professorial rock'n roll excitation released its sticking on the unconfirmed thing by unconfirmed reason.
I aligned the Xarm manually and via ASS.
Now we are back in the normal state.
This recovery proceeder deserves a pattern
Note: IR shield glass position variations, Atm4
UR osem IR shield glass is pushed back. It came out of its clip holder. The magnet is free.
Atm2, UL & LL magnets centered poorly. Almost hinging on opposite sides.
UR & LR centered well. There have plenty of room to move in an earth quake.
[ Manasa, Ericq and Steve ]
Vivitek D952HD with 186 hours installed.
* EQ Southeast of LA around 45 minutes ago. Callum and I felt it.
* Koji and I came in to recover. MC suspensions had been mis-aligned. ETMs both tripped their watchdogs.
* As before, the ETMX was stuck in its cage and the UR & LR OSEMs were reading zero V.
* We moved the MC sus back to their OSEM values from 2 hours ago. Koji aligned everything else by just using his chee.
* To shake the ETMX loose, I tried a different tactic than the "Great Balls of Fire". I started giving it 20k steps through the ASCYAW filterbank (with ramping OFF). I used the green light in the X arm video to look at the swinging. Using this as a readback I pumped the OFFSET button on ASCYAW to resonantly swing up the yaw motion. I had to turn the watchdog thresh up to 2000 temporarily. After a couple minutes the ETMX was free.
* We then used the bias sliders to steer it back onto the OL center (which Q nicely lined up for us recently) and then X arm locked in green right away.
Fri Mar 28 22:38:04 2014: We've just ridden through the 5th aftershock. None of the aftershocks have tripped the watchdogs but they break the IMC lock.
Local earthquake activity is up. Our suspensions are holding well. ETMX and ETMY sus damping restored.
Koji locked the MC, arms, and PRMI, with no troubles, after the M8.2 earthquake off the coast of Chile, that happened about 4 hours ago.
Atm2, Chilean 8.2M eq arrived to the 40m 16:57 in 10 minutes. Our OSEMs did not see them. Hanford got it 2 minutes later.
The date is correct on this monitor.
Last stored RGA scan data Dec 20, 2013
IFO pressure at CC1 5.8e-6 Torr
Valve configuration: Vacuum Normal, confirmable only by manual checking of position indicators and pressure gauge controllers readouts
The Osaka TG390MCAB maglev turbo pump's controller TC010M has passed the 40,000 hrs of operation. This triggered the " alarm" LED warning light to come on.
It is normal maintenance. Maglev TP-1 is running perfectly. Osaka will send us a loaner-controller that we can use while they do the std maintenance.
I'm thinking of ~ February to do this.
We just received the loaner controller that will be swapped in it tomorrow morning.
The vacuum pressure will rise somewhat during this action.
The loaner controller is swapped in. It has 520 Hz rotation speed. This speed use to be 680 Hz with our old one.
The 2W Innolight was off for 4 hours.
10 days of on-off glitching? It is a kick. The LSC is off, so it must be the ALS
The Maglev controller was serviced at Osaka Vacuum. It was swapped in this morning.
TP2's fore line - dry pump replaced at performance level 600 mTorr after 10,377 hrs of continuous operation.
Where are the foreline pressure gauges? These values are not on the vac.medm screen.
The new tip seal dry pump lowered the small turbo foreline pressure 10x
TP2fl after 2 day of pumping 65mTorr
TP2 dry pump replaced at fore pump pressure 1 Torr, TP2 50K_rpm 0.34A
Top seal life 6,362 hrs
New seal performance at 1 hr 36 mTorr,
Maglev at 560 Hz, cc1 6e-6 Torr
c1sus and c1iscey were reset. The PMC needed to be locked. MC locked instantly.
The FSS ion pump power supply was turned on.
c1sus needed reset.
For some reason or another, I decided that we should see if the optical lever servos were injecting too much noise into the test masses. The ITMs are much worse than the ETMs and I am afeared that they might be making the main noise for our arms in the 20-40 Hz region. Jenne is checking up on these feedback loops to see what's up.
To estimate the actuator gains of the mirrors, I turned on 1 count drives from LSC/CAL oscillators into the LSC drives of each test mass at the frequencies shown in the plot with the resulting peaks showing up in in POX/Y with the single arm locks in red. I will leave these going permanently, but with 0.1 count ampltiudes; we need to make it so in the scripts.
I'm in the process of filling this table
I should replace ETMX He/Ne laser
ETMX oplev qpd gain has to be increased.
Our only seismometer is at the east end now.
Atm1, Ditch Day morning puzzle. The gardener came after the freshman did leave and cut the grass with the lawn mower.
Atm2, Yesterday afternoon the Aztecs containers moved out.
Tonight I noticed that the drop in PMC transmission was ~1V, more than the usual of ~0.5V from the daily drift.
While re-aligning on the table, I noticed that the misalignment was not from either of the steering mirrors; i.e. I has to walk them both to get the alignment back. This implies that the misalignment is generated far upstream. Maybe the the laser itself is moving. We need some updates from Steve's laser misalignment tracker.
I'd like to replace the paper target with IOO -QPD_POS so we can log it.
The qpd was removed from the east end table and threaded adaptor ring epoxied on it's shell.
This tube will cut down the amount of emergency exit light getting into the qpd.
Den and I spent some time with the interferometer last night with hopes of bringing in the AO path, but were stymied by the (re)occurrence of the anomalously high low frequency motion of the Xarm, as seen by fluctuations of TRX from .9 to .2 while "held" on resonance.
Jenne reported that they weren't seeing it earlier in the evening, and then it started again when I showed up. Holding the arms on IR, we could see a fair amount of excess low frequency noise in the BEATX_FINE_PHASE_OUT_HZ channel, as compared to BEATY, bringing its RMS to 5 times that of the Y arm. From the shape of the excess noise (broad slope from DC to tens of Hz), Rana suspected air currents and/or scattering effects being the culprit.
Den poked around a bit on the PSL table, which didn't really change much. He then went down to the X end table to inspect the table, and while he was there, I noticed the noise go down to being in line with the Yarm. I joined him at the end, and we found the beat phase noise in the frequency region of concern to be hugely sensitive to tapping on the enclosure, air current, etc. There is also a ton of green light everywhere, and multiple spots of green light around the green refl PD.
At that point however, the quiescent noise was acceptable (TRX fluctuations of <.2), so we went back to the control room to try to lock. Unfortunately, after a few attempts, the noise was back. At this point, we went home. The layout of the end table likely needs some attention to try and minimize our susceptibility to excess scatter effects.
Turn off the AC and flow bench please.
Atm3, Oplev sum read 12,000 counts when the qpd was disconnected ?
Dark qpd was zero and normal He/Ne incident on qpd was 1,730 counts.
Anodized aluminum dumps replaced by 6 razor beam dumps.
Two more razor beam dumps added this afternoon. The picture will updated tomorrow.
There are 9 razor beam dumps at ETMY-ISCT
Tektronix RECALL on TDS3000 or TDS300B oscilloscope BATTERIES TDS3BATB
This Lithium-Ion battery can be a fire hazard ! Remove battery pack and recycle it through Safety Office !
I added two green glass absorbers. The oplev centering may need a touch up when it is well aligned.
Rga scan at pump down 77, vacuum normal valve configuration, maglev rotation 560 Hz and day 111
Also, while I was working on the PSL table, I heard noise that sounded like a bearing rolling around. I suspected the HEPAs, since the one on the north east corner of the table has a problem when it's turned up high (we've known about this for a long time), however turning off the HEPAs didn't affect the noise. The noise is strongest near the back of the PSL controller on the shelf above the table, and the PSL controller box is vibrating. So, I suspect that the fan on the PSL controller box is about to give out.
EDIT: To clarify, I mean the Innolight's controller.
The bearing is chirping in the back of the 2W Innolight laser controller. It is loud enough to hear it. I placed 4 soft rubber feet under the controller to avoid shaking other things on self.
The HEPA filter bearing becomes noisy at 50V
Keep it at 20V for low noise
The 4th week of no wet mopping of the floor and no wet wiping the vacuum envelope.
We cleaned the intakes of the south arm IFO air condition. The bottom duct have quite a bit accumulation Atm1
See wet wiped contrast on Atm2
We found 3 holes around pipes ( coming from CES ) on the east wall that has to be sealed.
After closer examination of these holes, they are sealed off well.
Air condition maintenance will be finished by 11:30am tomorrow.
Yesterday, Kelvin mopped with chemicals the whole floor area of the lab. This was triggered by some visiting ants at our PSL last week. It was 6 months since we had the last fully wet mopped IFO floor.
The cleaning- mopping water became very dirty at the end.
I have brought back c1auxex and c1auxey. Hopefully this elog will have some more details to add to Rana's elog 10015, so that in the end, we have the whole process documented.
The old Dell computer was already in a Minicom session, so I didn't have to start that up - hopefully it's just as easy as opening the program.
I plugged the DB9-RJ45 cable into the top of the RJ45 jacks on the computers. Since the aux end station computers hadn't had their bootChanges done yet, the prompt was "VxWorks Boot" (or something like that). For a computer that was already configured, for example the psl machine, the prompt was "c1psl", the name of the machine. So, the indication that work needs to be done is either you get the Boot prompt, or the computer starts to hang while it's trying to load the operating system (since it's not where the computer expects it to be). If the computer is hanging, key the crate again to power cycle it. When it gets to the countdown that says "press any key to enter manual boot" or something like that, push some key. This will get you to the "VxWorks Boot" prompt.
Once you have this prompt, press "?" to get the boot help menu. Press "p" to print the current boot parameters (the same list of things that you see with the bootChange command when you telnet in). Press "c" to go line-by-line through the parameters with the option to change parameters. I discovered that you can just type what you want the parameter to be next to the old value, and that will change the value. (ex. "host name : linux1 chiara" will change the host name from the old value of linux1 to the new value that you just typed of chiara).
After changing the appropriate parameters (as with all the other slow computers, just the [host name] and the [host inet] parameters needed changing), key the crate one more time and let it boot. It should boot successfully, and when it has finished and given you the name for the prompt (ex. c1auxex), you can just pull out the RJ45 end of the cable from the computer, and move on to the next one.
Koji, Jenne and Steve
Preparation to reboot:
1, closed VA6, V5 disconnected cable to valves ( closed all annuloses )
2, closed V1, disconnected it and stopped Maglev rotation
3, closed V4, disconnected its cable
See Atm1, This set up is insured us so there can not be any accidental valve switching to vent the vacuum envelope if reboot-caos strikes.[moving=disconnected]
4, RESET c1Vac1 and c1Vac2 one by one and together. They both went at once. We did NOT power recycled.
Jenne entered the new "carma" words on the old Dell laptop and checked the good answers. The reboot was done.
Note: c1Vac1 green-RUN indicator LED is yellow. It is fine as yellow.
5, Checked and TOGGLED valve positions to be correct value ( We did not correct the the small turbo pumps monitor positions, but they were alive )
6, V4 was reconnected and opened. Maglev was started.
7, V1 cable reconnected and opened at full rotation speed of 560 Hz
8, V5 cable reconnected, valve opened..............VA6 cable connected and opened........
9, Vacuum Normal valve configuration was reached.
The aging of the laser came up when the noisy bearing showed. ~10% down in in 4 years. That is pretty good.
ETMX medm screen values are blank.
The window is at the north west corner of the PSL enclosure.
The 1 mm thick BK7 window is AR coated both side R <0.08%, W2-PW1-1004-1064-0
The PZT stack is 0.75" OD, 0.25" thick with ~ 6 mm ID, motion range 2.5 micron at 200V
Soft silicon rubber isolation.
RXA: This is the opto-mechanical phase shifter that Steve has built for diagnosing scattered light problems. We put it into the reflected light path of any of the cavities and see if it can move the scattering noise from DC up to a higher frequency. e.g.:
The paper on this from GEO
This morning valve condition: V1, VM1, V4 and V5 valves were closed. IFO pressure rose to 1.3 mTorr
It was caused by low N2 pressure. Our vacuum valves are moved-controlled by 60-70 PSI of nitrogen.
When this supply drops below 50-60 PSI the interlock closes V1 valve. This is the minimum pressure required to move the large valves.
It is our responsibility to check the N2 cylinder pressure supply.
The vacuum valve configuration is back to VAC. NORMAL, CC1 4.8E-6 Torr
PS: Bob says that the second cylinder was full this morning, but the auto-switch over did not happen.
The TESCOM automatic changeover regulator [ model ACS 012-1011 ] manifold is most likely clogged. The new one will arrive 8-8-2014
This means that the IFO pressure may go up to a few mTorr when we change cylinder or V1 valve triggered because there is no nitrogen supply.
Ophir power meter gets new filter with calibration. This is not cheap. It was the second time we lost it.
Filter leash is attached.