so as to monitor the bouyancy lift of the vent. Plus, it will likely trip anyway once aggresive activities start. If the operator and well anybody that notices, keep the ISI OVERVIEW border green by reseting the watchdog whenever the border is not green. Thanks!
| Oplev |
Data segment (1Hr long) |
Sum (counts) | Glitchy? | Remarks |
|---|---|---|---|---|
| ETMX | 01-08-2016 13:00 UTC | 41000 | No | Seems good. One more stage of whitening may also be ok. |
| ETMY | 01-08-2016 10:00 UTC | 28000 | No | All Good. Could copy these settings to ETMX. |
| ITMX | 01-08-2016 10:00 UTC | 33000 | No | The periodic pulses seen in the SUM is probably due to the temperature controller in the diode laser having railed or become unstable. |
| ITMY | 01-08-2016 10:00 UTC | 30000 | No | Does not seem to have whitening filters since we can see in the SUM spectra that it is being limited by ADC noise beyond 5Hz. |
I dont think the ITMX laser is mode hopping. I did not notice any step like changes in the SUM signal, though it is hard to tell due to the periodic pulses.
The latter can be fixed by tweaking the PID setttings of temperature controller and its set point, I think.
Both ITM oplevs have large resonances at ~60 and ~90 Hz. These are much attenuated in ETMs. The mounting of ITM oplevs could perhaps be examined to see if there is something out of place.
At the laser wavelength 632 nm, Si QPD efficiency is ~0.35 A/W; Transimpedance=10kOhm according to D1100290 ; Differential Ouput gives x2 ; 16bit-ADC gives (2^16)/20 counts/V;
Using these factors : 1mW of incident light on the QPD would give us ~23k counts. Since ETMX, ITMX and ITMY oplevs have 18dB, 21 dB and 15 dB whitening gain,
the incident power on these QPDs is
| ETMX | ETMY | ITMX | ITMY |
| 0.32 mW | 1.22 mW | 0.13 mW | 0.23 mW |
And 1/4 of that per quadrant !!
Note: I'm not sure over what time duration Suresh made his analysis, but Jason has recently tweaked the gain and whitening settings on the ITMX, ITMY, and ETMX optical levers last week Tuesday (July 28). See LHO aLOG 28645. Likely, Suresh's suggestions to improve the whitening were based on data prior to this change, and the setting are now acceptable. See Keita's post-change assessment in LHO aLOG 28661.
The data segment analysed is from 1st Aug 2016 at about 10:00 UTC.
And yes ... I had initially analysed data from before the change and had to redo the job after I saw the post by Jason on the 26th Aug (and also the request from Keita). This analysis is after all those changes.
And just in case I goofed up something, I rechecked the time stamp on the data plotted in the attached pdf file. All data is from 1st Aug.
As Hugh noted in his July 19th alog (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28525) when we reprogrammed the site-wide timing systems on 19th May 2015 and 19th July 2016 the HEPI pump controller units saw a bogus drop in hydraulic fluid pressure. On 19th July of this year the drop at EY was sufficient for the PID controller to attempt to correct, resulting in an excess of presssure which caused problems.
At these times we also saw a bogus increase in cold cathode gauge readings from the vacuum controls system (Kyle put in an alog). Initially I thought more systems were being affected, but today I did some more in depth investigation and the problem appears to be limited to hepi pressure and vacuum cold cathode signals.
At EY I trended all the raw ADC channels in the Beckhoff Vacuum system (terminals M12-16 chans 1-4). The only channels which saw an increase were M11-chan2, M12-chan1 and M12-chan3. These are the input signals for the three cold cathode gauges. When we trend these same signals from May 2015 (back when the computer was the orignal VME system) these same signals show bogus deviations. I looked at the slow-controls Beckhoff system and the weather station, but could not see the problem there.
There are some exceptions to the rule (for example in 2015 hepi-EX did not see a change) but generally when we reprogrammed the timing system the Cold Cathode and Pump Controllers saw a change of input voltage. The question is why only timing reprogramming causes the problem and not the many reboots we have done over the years. I suspect the powering of the 12V units (fanout, comparator, RF Amp, IRIG-b) which we rarely do as opposed to the more frequent powering of the 24V IO Chassis may be a clue.
Tomorrow, under WP 6035, we will go to EY and repeat the power cycling sequence we followed on 19th July. We will repeat everything except for the actual reprogramming. We will be closely monitoring the ADC inputs for these signals. At the end of the excercise Ansel will upgrade the FPGA on the EY fanout using Daniel's latest code.
The alignment into the reference cavity was tweaked. Mostly a vertical adjustment followed by a
minor adjustment to the yaw. The transmission as reported on the MEDM screen went from ~2.6V to
~4.6V.
Measured the power before the lens located in front of the ALS fibre to be 33.4 mW. At this
time MEDM reported 4.62V.
With a DMM, the DC output of the locking photodiode was measured.
- locked: 0.124 - 0.134 V
- unlocked: 0.772 - 0.777 V
So the reference cavity visibility is 83.3%. The gain of the filter yielding the DC output of the
locking photodiode was changed from -0.050 to +0.500 as this agreed better with the value measured
with the DMM. Not sure why the big change other than I had noticed that since the CDS reboot of a
couple of weeks ago, the reflected DC was different. Perhaps this gain setting wasn't saved?
For the transmission photodiode, when the FSS was unlocked the DMM measured -1.8mV. MEDM
reported ~0.121V at the same time. When the FSS was locked and MEDM reported ~4.6V in transmission
the DMM measured -2.766V to -2.777V.
Jason/Peter
For a comparison I just happened to measure the ref cav visibility yesterday as part of the PSL rebuild and LLO also get ~83% visibility
Kiwamu, Nutsinee
A code is scheduled to run at 9 pm tonight. The code will power up CO2 to 1.3W and power it back down to 0W after 6 hours. Please do not touch ITM optics.
I updated the HWSY centroids with low variance versions.
I also reset the HWSY magnification to 7.5x
controls@h1hwsmsr:~/temp/HWSY$ caput H1:TCS-ITMY_HWS_MAGNIFICATION 7.5
Old : H1:TCS-ITMY_HWS_MAGNIFICATION 17.5
New : H1:TCS-ITMY_HWS_MAGNIFICATION 7.5
Here is the time series for the CO2 heating from last night. Analysis to follow but rough numbers are as follows.
There are two measurements per ITM of the lensing: when CO2 is turned on and again when CO2 is turned off. Hence:
| CO2 | HWS | Lens per Watt | |
| X | 1.25W | 63 +/- 2 uD | 50.4 +/- 2 uD/W |
| Y | 1.1W | 55 +/- 7 uD | 50 +/- 6 uD/W |
One thing that I forgot to mention is that I make the power step down half way and stayed there for an hour before going to 0W. As you can see from the timeseries.
Every time when we restart the HWS code for ITMY, the code sets the MAGNIFICATION value back to default of 17.5 and this had been annoying. So instead of manually changing the value for every restart, I made a hack so that when the code is executed for ITMY, it automatically changes MAGNIFICATION to 7.5, 60 seconds after the execution of the command. This was done by editing the alias setting in ~/.bashrc. Now the alias for Run_HWS_H1ITMY is written as follow.
alias Run_HWS_H1ITMY='/opt/HWS/Run_HWS_0/distrib/Run_HWS_0 & sleep 60; caput H1:TCS-ITMY_HWS_MAGNIFICATION 7.5'
This was tested once and was successful.
After a few days of consult with SYS and ISC, today I added some side supports to the OMC PD housings that Koji and I found to be problematic last Thur (alog 28714). Attached are pictures of 1 of the 2 PD mounts with the 2 new 10mm glass prisms and the 1 new D1600316 metal prism. I tried to use a minimal amount of glue on the bottom of the glass prisms in order to have a nice rounded (low stress) bond there, and then use a bit more glue on the upright side wall which is more of a porous surface. Although after a few minutes I stopped having sliding issues with the glue bonded prisms, I left them with a guge block applying a little bit of pressure at the front edge in case they slide away during the night of curing. The lab temperature has been set to ~83deg F in order to assist the cure.
Reset the HAM6 cleanroom dust alarms from Clean-10000 to Clean-100. There will be minor alarms at 70 counts and major alarms at 100 counts. OPS if you are getting alarms, do not adjust the alarm levels or ignore them. This monitor (LVEA #6) is in a running cleanroom which has been prepped for tomorrows chamber opening. Alarms should be investigated if their source is not known. DM LVEA #6 was tested and is functioning as expected.
State of H1: Lightpipe is closed and locked, rotations stage is disabled at 2W, venting HAM6 tomorrow
Activities:
15:00-16:00UTC:
- morning meeting, alog 28769
- commissioning meeting
16:00-20:00UTC:
- JeffB - LVEA - dust count
- Fil/Alfredo/Elizabeth - HAM6/BSC3/BSC7 - pulling able to ITMX chamber for vacuum gauge
- tour in Control Room
- Hugh - helped with HAM6 SEI configuration, alogged here, alog 28773
- I took a snapshot of the last good alignment, alog 28779
20:00-22:00UTC:
- Chandra - MY - CP5 overfill
- Gerardo - EY - retrieved a yellow viewport cover
- Richard - disabled the rotation stage, alog 28786
- Richard - lightpipe locked, alog 28788
- Kyle - LVEA - measured dewpoint, alog 28782
- JimW/Micheal/Krishna: JimW + UW crew
- bringing in a new seismometer
- will be careful to avoid adding contamination to the LVEA
- will be taking it to the vertex - hand cary over or slide under the beamtube
- Fil/Alfredo/Elizabeth - HAM4, BSC3, BSC7 - pull new cable to vacuum gauge on BSC7
- Peter/Jason - PSL air conditioning has been changed, no entry into the PSL as of 22:00UTC
- Nutsinee - LVEA - TCS
- HAM6 ISCT6 moving crew - LVEA - moved the table away from HAM6 - Jenne, Keita, TJ, JeffB
- Gerardo - LVEA - HAM6 - covered a viewport with a yellow cover
- JeffB - LVEA * 4 - checking air quality / dust - other vent prep
- Robert/Richard/Fil - on the roof for anemometers
- Robert/Fil/Richard - back from the roof
- Jenne, TJ, Keita - out of the LVEA
- Chandra - back from MY
- Gerardo - back from EY
- Richard - back from LVEA
- Nutsinee - back from the LVEA
- Gerardo - back from HAM6
- JeffB - out of the LVEA
22:00-22:35UTC:
- JimW - out of the LVEA
- Fil/Alfredo/Elizabeth - out of the LVEA
22:35-23:00UTC
- Krishna/Micheal - out of the LVEA
23:00UTC - end of OPS coverage today - no eve shift OPS this week due to HAM6 vent
Tomorrow - known activities:
- vent HAM6 and remove door(s)
- craning - Bubba
- seismometer setup - Micheal/Krishna
- Peter and Jason - out of the PSL
An update on the fire at the base of Rattlesnake Mt. from the DOE Hanford Works:
| Subject: | PRIORITY MESSAGE: FIRE UPDATE |
|---|---|
| Date: | Mon, 1 Aug 2016 20:52:06 +0000 |
| From: | Hanford EOC |
At this time [1:52 pm PT] all State Routes in the area are open. Fire command officials have reported that back-burn operations are being conducted on the Arid Lands Ecology Reserve (ALE) to move the fire west. Fire officials do not anticipate the fire will reach State Route 240.
Employees should continue to use caution when traveling in areas that may be impacted by smoky conditions or increased emergency services vehicle traffic.
We will continue to monitor the situation and provide updates if conditions change.
Rotation stage is disabled at 2W input power to the IMC.
Of course, the shutter is closed, so there is no beam from the PSL into the vacuum system.
We closed the shutter for two laser beam pipes between PSL and HAM1.
Lexan plates were installed on all HAM6 viewports. Yellow covers were installed on these viewports except one. For the remaining one, Gerardo will find and install one later).
Cable connections were documented and photographed, and all cables were disconnected from the table.
The accelerometer cable on HAM6 North door was disconnected fron the accelerometer and was taped on HAM5 North door. But the accelerometer itself is still on HAM6 North door.
ISCT6 was moved out of the way.
Cabling documentation of ISCT6.
Took 12 sec. to overfill CP3 until LN2 poured out exhaust, with 1/2 turn open on LLCV bypass valve. Lowered CP3 LLCV from 18% to 17%.
In order to move ISCT6, the lightpipe from the PSL needed to be closed.
Jenne closed it and locked it closed - it should remain until after the HAM6 vent.
Not quite...
Attached are trends of the LVEA Dust Monitors.
On the 24hr trend, there was a little bit of dust in the LVEA between 8am-1pm, but in the cleanroom, were have been near zero for the last 24 hrs.
On the 4-day trend, the only dust in the HAM6 cleanroom was from technical cleaning on Friday.
Jeff is going to take some more readings outside.
Checked particle counts from outside and inside the OSB and in the LVEA. Summary: Outside air is currently around 330,000 for 0.3um particles. As one moves through the OSB towards the LVEA the counts drop as the building air filtration system does its job. Counts in the LVEA range from 1290 to 270 03.um particles. The attached spreadsheet has the complete readings for all sampled locations. Will continue to monitor as the fire continues to burn.
Second Mid-day check of air around the site shows air quality is not improving. Fires continue to burn or smolder and light wind is not helping clear the air. Posted are the 13:00 hours data. Outside and inside counts are up considerable. Particle counts inside the cleanrooms remain well within acceptable levels for in chamber work.
