The new Met One dust monitors have been installed in:
The LVEA at HAM6 and in the Beer Garden, in the Optics Lab,End-X, and End-Y. They are and sampling for 60 seconds every 10 minutes. 

There are still a few minor issues being resolved, which do not effect the operation of the units or the particle counts. 

Attached is a quick operators guide to the new monitor. Fuller documentation will follow.    

John, Chandra

Pressures at IPs IP-7 & IP-8 on diagonal were ~10 Torr. Pumped out volumes with aux cart and opened gate valves to main diagonal volume. Connected HV cables, but did not activate IPs yet. Current diagonal pressure = 7e-7 Torr.

IP-8 still needs cable strain relief.

h1fw1 froze up last night at 22:41 PDT with a kernel panic. It was restarted at 10:16 PDT today (I pressed the front panel reset button)

last part of the console error message was:

VFS: Close: file count is 0

Kernel panic - not syncing: CRED: put_cred_rcu() sees xxxxxxxxxxxxxx with usage -1

where xxxxxx is a large hex number.

We've had much more success tonight with the non-broken Xarm Trans QPD.  We once again re-centered the spots on the ETMs, although they didn't need much moving.  We are able to sit at 10W and 12W just fine now.  Now, we're running into regular ol' loop oscillations, so we've been measuring loops at different powers, and trying to re-tune them. 

CHARD Y seemed the most egregious, so we created a new control and boost filter combo, which live in FMs 4 and 5.  Unfortunately, these filters are totally unuseable at 2W, although they improve our stability at 10W, so right now the guardian still only engages the old loop shape filters.  We'll have to re-think the 2W filter situation to make sure we can transition between these filters.  Right now, we were by-hand turning off the CHARDY loop, changing the filters, then re-engaging the loop.  Attached is an open loop gain for the new loop.

PRC2 pitch we've decided is kind of okay if we use a factor of 2 less gain.

Now, we're seeing oscillations that also show up in AS 90, so we suspect either the MICH or SRC angular loops.  Unfortunately, there's something going on with NDS/the lockloss plotter/something, such that I can't get data from the last ~5 locklosses.  The ones before that, I can still get and plot, but it can't find data for the last several even if it's been an hour since that lockloss. 

So, next up:  Measure the MICH and SRC loops at 10W to see if they're close to unstable.  Measure again at 15W, and then think about going from there.

I have updated the documentation in the DCC here,

https://dcc.ligo.org/LIGO-T1500502

about hoft generation for ER8/O1 to include information about C02 hoft.

In particular, these caveats are included:

* For the exact versions of filter files, code, and command lines used to generate C01 and C02 hoft see: https://wiki.ligo.org/Calibration/GDSCalibrationConfigurationsO1

* Users should check with their working group about which vetoes and which veto-definer files to use with each type of data before producing final results.

Michael, Krishna, Hugh, Jeff

This morning, we took out the piezo stacks from under the BRS-2 platform. We then turned on the ion pump. The current initially went up to 20 mA and slowly dropped down to ~300 microamps in ~1 hr. We then disconnected the Pump station. When we checkd it later after about 4 hrs, the pump current was ~200 microamps (P ~ 1e-6 torr) and steadily dropping.

Michael and I then hooked up the rest of the electronics, wrapped the vacuum can in several sheets of foam, and finally set up the thick-foam-box around the instrument.

Hugh had set up the EY_GND medm screen showing the BRS-2 data coming into the ISI frontends (similar to EX_GND). After correcting a cable connection mistake, we are now getting the BRS-2 angle data into CDS. Currently we are getting the following channels in to ISI AA Chasis:

ADC0, channel 27: Raw Tilt Signal : Calibration - to be worked out soon. This is a high-passed value of the raw angle measured by the autocollimator, high pass: 2 pole at ~0.5 mHz.

ADC0, channel 28: Drift Signal : Calibration: 58.33 nrad/ct. This is a scaled down version of the raw angle signal.

ADC0, channel 29: Ref Signal : Calibration: - to be worked out soon. This is the angle of the reference mirror. It is useful as a measure of the autocollimator noise. Unlike BRS-1, this signal has a higher noise floor and is useful only at very low frequencies, below ~ 5 mHz.

ADC0, channel 30: Status Signal : This is currently zero. The plan is to use this as an indication of the health of BRS-2.

The Tilt channel is currently noisy and we will investigate further tomorrow.

Introducing the new LASER_PWR Guardian node! Use it to change the power by selecting one of the three requestable powers (2W, 10W, 22W) or open the "ALL" screen to select any 'POWER_#W'. I attached a shot of the graph if you're curious. This node is nominally manged by ISC_LOCK and then ALIGN_IFO during initial alignment (though this has created some usermsg issues that I am trying to work around, more on that later).

I have also changed around some of the management for initial alignment. If the user wants to run initial alignment:

1. From READY in ISC_LOCK, go to manual and select INITIAL_ALIGNMENT

2. Wait for ALIGN_IFO to run through its DOWN state. This will temporarily take control of the ALS's, LASER_PWR, and IMC_LOCK nodes.

3. Run the green alignment from ALIGN_IFO instead of each of the ALS nodes. Offload the green WFS at the same ti.

4. Continue as usual, during SRC the LASER_PWR node will bring the power up to 10W and then back down after.

6. When done with initial alignment, make sure to go to INIT on ISC_LOCK to take back control of the nodes. then continue as usual.

I added the LASER_PWR, as well as the SR3_CAGE_SERVO nodes to the Guardian Overview screen (shot attached).

I also slightly changed the ISC_GUARDIANS medm to show who the managers are of each node and placed the new node on the bottom. (shot also attached).

As I mentioned above, there are some user messages that will pop up on ALIGN_IFO and ISC_LOCK about the nodes being stolen by one another. This isn't a big deal for ISC_LOCK to report this whie we are in the middle of initial alignment, but it isn't good for ALIGN_IFO to be continuously notifying during normal locking. I have something that I want to try next opportunity I get, hopefully tomorrow. And if that doesn't work, Jamie seemed to have an idea of how to solve these types of situations that will be in the next Guardian release. Until then we can not manage the nodes during initial alignment just as before.

This is an update of the DCPD cross correlated spectra. This time I have added the one from Livingston which was integrated over 1266 hours using the O1 data. High noise durations (e.g. LLO 23453) are excluded from the integration.

The fig and mat files are attached.

TITLE: 03/30 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Jim
SHIFT SUMMARY: Good day for locking.  Had the IFO as far as DC Readout by 16:30.  Then some QPD and other work took me down.  Since then, we have been back to locking consistently.
LOG:
15:16 Krishna and Michael to EY BRS work

15:41 Bubba driving inside of both arms checking tumbleweeds

16:05 Chandra pump cart work in diagonal

16:26 Fil to EX QPD work

16:27 Karen and Chris done in LVEA

16:40 John and Bubba to LVEA

16:58 John and Bubba out

17:42 Fil and Richard back

17:45 Fil and Ed to LVEA HAM3 cabling

18:08 Fil and Ed out

18:18 Ed to LVEA

18:50 Ed out

19:30 Fil to EX QPD

19:53 Fil done

19:54 Jeff B to both ends

20:11 DAQ restart

20:30 Jeff B back

20:36 Ed to LVEA

20:47 Bubba and Nicole to MY

(Tasked by Aidan)

We were curious of how the HWS sled power decrease over time so we know when to swap them out. Below I've attached plots of HWSX and HWSY sled power (corrected for gains) and input current. The start time is when we replaced the SLED (April 26, 2015 for YSLED and March 1, 2016 for XSLED). I only plotted the time when the SLEDs were turned on (displays in number of days). XSLED shows deteroration of ~2% per day and YSLED shows deterioration of ~1% per day (given 7mW to be 100%, I don't think we are shooting 7mW out though but the trend looks reasonable). YSLED power decreased slightly faster when the input current = 94 mA.

XSLED data can be found here and YSLED data can be found here. The column goes Time|Power (mW)|Current(mA). The script to fetch and plot data can be found in the same directory.

The fast decay in the beginning is a known problem.

Jenne, Hang, Sheila, Keita, Evan

Tonight it seems like we made some progress, although we haven't powered up yet.

• TMS X QPD A seemed to have some kind of saturation of segment 1, which was causing our soft loops not to work well (ie to sometimes drag the X arm alignment way off).  reduced the analog whitening gain for all 4 TMS QPDs, which used to be 9 dB in full lock but is now 0 dB. 
• We were able to power up from 2 Watts to 8 Watts and see the oscialltion several times to check if configuration changes had any impact on our CSOFT oscillation. A list of things that had no impact:
  • turning off ITM optical lever damping (4:34:05 UTC)  (still off)
  • turned on 0.44 Hz notches in SOFT loops (4:47)
  • turned on a resG at 0.44 Hz in DARM (4:56) (reverted right away)
  • set A2L gains using A2L script (5:07 UTC) (reverted right away)
  • CHARD low gain (5:30 UTC)
•  Lastly, we used the alignment dither system, with all the A2L gains set to zero, and tuned the soft offsets to center the beams on the ETM actuation nodes. (the soft offsets don't have much of an impact on the ITM spot positions.)  For future reference, the demod phases we used for pit were -25 degrees, for yaw we used -40 for osc1, -30 for the rest.
• With these offsets we were able to power up to 12 Watts before seeing the oscialltion, where previously we had been seeing the oscillation at 8 Watts.  This was before we understood the problem with the QPD saturations, so the soft loops didn't really keep us centered on ETMX as we powered up.  We stopped for a while at 10 Watts, ran the A2L script to set gains, and did a little bit of work to update the X arm green QPD offsets. 
• We have a new guardian state ENGAGE_SRC_ASC, which will just be convient because we have been going back and forth between turning these loops off after DRMI and leaving them on.  It is not tested yet.

The first screenshot attached shows the symptom of the xarm soft loop not working, as we power up the optical levers move, and the loops work to bring the QPDs back to their starting points but bring the optical levers in the wrong direction, causing the green to become misalined.  The second screenshot shows the individual segments of the X arm QPDs durring this time.  The third screenshot shows a power up (to 20 Watts) towards the end of O1, with no evidence of saturation, despite almost twice the power on each segment.  The last screenshot shows the noise of each segment, the bottom panel is before reducing the whitening gain, the top panel is after (the A2L dither lines were on, that is the forest of lines around 20 Hz). Although it seems like we have more sensible signals coming from the QPDs with the lower whitening gain, something still doesn't quite add up when you compare the second and third screenshots. 

WP 5799 FR 4694 (PKA II 1193)

Continuing the offload of SUS calculating the SUSPOINT motion from ISI GS13 cartesian motion, this has ISI doing the calculating.  We'll stop the SUS doing the calcs as soon as we confirm that DetChar is happy with the ISI numbers.

All the HAM models were rebuilt & installed and FrontEnds restarted.  safe and OBSERVE.snaps were checked and updated (lots of new channels.)

No issues with HAM ISIs reisolating.

Medm editing is ongoing for the SUSPOINT.  Each medm is custom for the number of suspensions.  HAM6 and HAM2 still need to be built.

Along these lines, the BSC Models were adjusted to put the SUSPOINT on IPC and at ENDY, the BRS was added as at ETMX.

SVN COMMITS:

hugh.radkins@opsws1:models 0$ svn commit -m "HAM SUSPOINT calcs moved to ISI and BSC SUSPOINT calcs added to IPC and BRS at ETMY"
Sending        models/h1isibs.mdl
Sending        models/h1isietmx.mdl
Sending        models/h1isietmy.mdl
Sending        models/h1isiham2.mdl
Sending        models/h1isiham3.mdl
Sending        models/h1isiham4.mdl
Sending        models/h1isiham5.mdl
Sending        models/h1isiham6.mdl
Sending        models/h1isiitmx.mdl
Sending        models/h1isiitmy.mdl
Transmitting file data ..........
Committed revision 12961.
hugh.radkins@opsws1:models 0$ pwd
/opt/rtcds/userapps/release/isi/h1/models

hugh.radkins@opsws1:hamisi 0$ svn commit -m "Added suspension OPTICs for medm generation"
Sending        hamisi/H1_isiham2_overview_macro.txt
Sending        hamisi/H1_isiham3_overview_macro.txt
Sending        hamisi/H1_isiham4_overview_macro.txt
Sending        hamisi/H1_isiham5_overview_macro.txt
Sending        hamisi/H1_isiham6_overview_macro.txt
Transmitting file data .....
Committed revision 12962.
hugh.radkins@opsws1:hamisi 0$ pwd
/opt/rtcds/userapps/release/isi/h1/medm/hamisi

hugh.radkins@opsws1:burtfiles 0$ svn commit -m "Update snaps for SUSPOINT & commissioning"
Sending        burtfiles/h1isibs_down.snap
Sending        burtfiles/h1isibs_safe.snap
Sending        burtfiles/h1isietmx_safe.snap
Sending        burtfiles/h1isietmy_OBSERVE.snap
Sending        burtfiles/h1isietmy_safe.snap
Sending        burtfiles/h1isiham2_safe.snap
Sending        burtfiles/h1isiham3_safe.snap
Sending        burtfiles/h1isiham4_OBSERVE.snap
Sending        burtfiles/h1isiham4_safe.snap
Sending        burtfiles/h1isiham5_OBSERVE.snap
Sending        burtfiles/h1isiham5_safe.snap
Sending        burtfiles/h1isiham6_safe.snap
Sending        burtfiles/h1isiitmx_safe.snap
Sending        burtfiles/h1isiitmy_OBSERVE.snap
Sending        burtfiles/h1isiitmy_safe.snap
Transmitting file data ...............
Committed revision 12963.
hugh.radkins@opsws1:burtfiles 0$ pwd
/opt/rtcds/userapps/release/isi/h1/burtfiles
 

I'll commit the medm adls once I'm finished with them.

J. Kissel, B. Weaver, H. Radkins, D. Barker, J. Batch

Here's a list of all of the upgrades we were involved in today. There will be more details of the upgrade, more debugging, associated MEDM screen changes, svn commits, and other clean up tomorrow as we continue to explore what we've installed and debug. Bear with us, and thanks for your patience.

1) Fixed UIM coil driver path's automatic compensation bug by updating CD_STATE_MACHINE.c. See Int. Issue 1178.
2) Installed ISI GS13's projection to SUSPOINT Euler basis projection into the SEI models. See ECR E1600028.
3) Sent the Euler Basis Longitudinal DOF for each SUS involved in a cavity over various IPC (PCIE and RFM) and models (ISI, End-station PEM, H1OAF) to be collected in OAF. See ECR E1600028.
8) Removed the excess RFM channels from End-Station ALS models (noteably *not* the excess channels in the ISC models). This made room for 3). See LHO aLOG 25216
4) Added various rotational sensor correction paths to the BSC ISIs (GND BRS to ST1, and ST1 to ST2). (Prototyping, this stuff, no ECRs just yet)
5) Removed the L4C sensor correction path. See SEI aLOG 666
6) Added new infrastructure for the EY BRS. (Most Copied from EX, covered by ECR E1500246)
7) Reverted the BSC SUS's coil driver monitors to store the NOISEMON in the frames (and pushed the FASTIMON to the commissioning frames). Also, we put filter modules in front of the NOISEMONs (like was done for the FASTIMONs the last time we touched this) in case we ever wish to calibrate them. See ECR E1600033 and LHO aLOG 26313

Because we haven't built MEDM screens and actually *used* any of these paths yet, there's still potential for bugs and we haven't explored and/or fixed all of the collateral damage. Stay tuned as we continue to work on all of these updates tomorrow.

We did a little bit of ASC work today.  

First, while Kiwamu was running a TCS test I started a script to automate phasing of the WFS.  It uses the lockin, first runs a servo to set the phase of the lockin demod, then servos to minimize some signal.  We have it set up right now to phase the refl WFS to minimize the PR2 pit signal in Q for both REFL 9 and 45, and to minimize the SRM pit signal in AS 36 Q.  There is some code for exciting DHARD, but we need to test amplitudes, phases and gains for this.  The current version of the script does its job although it is painfully slow, and is checked into the svn under asc/h1/scripts  THe resulting phases are in the attached screenshot. 

We saw that the instability in CHARD pit was becasue somehow the LP9 got turned on again, this is now off and CHARD seems fine.  

We tried powering up, were fine at 10 Watts.  We had an instability in PRC1 and PRC2 yaw at 13 Watts.  I reduced the Q on the complex zeros at 1.1 Hz for PRC2Y, which gives us slightly better phase and gain near the point where we seem to be unstable. Attached is a screenshot of the OLG measured with white noise at both 2 Watts and 10Watts, we might need to do a swept sign to get a good measurement around 1 Hz. 

After about 10 minutes at 12 Watts, we had the usual fluctuations in the recycling gain.  So the high bandwidth PRC2 loops haven't totally solved the problem. 

For the record, these are angle settings that give approximately good CO2 powers tonight, and the powers to aim for from Kiwamu's note:

We have twice had the rotation stage for CO2 Y go to an angle that was wrong by a lot (sending a few watts to the test mass for a few seconds).

I'm leaving the IFO locked at 10Watts. 

This is a quick summary of today's TCS joy. I ran another differential lensing test today. I went to the other side of the differential lensing (CO2X goes higher power).

The highest cavity pole was 352 Hz in this test.

• CO2 X 500 mW --> 700 mW --> 500 mW
• CO2 Y 230 mW --> 80 mW --> 230 mW

This time, I also took many measurements of the intensity and frequency noise couplings periodically throughout the test using Evan's automated measurement script (20470). I will analyze and post them later. The second attachment is trend of some relevant channels.