J. Kissel, S. Karki, B. Weaver, R. McCarthy, G. Merano, M. Landry

After gathering the weekly charge measurements, I've compared H1 SUS ETMY ESD's relative Pitch/Yaw actuation strength change (as measued by the optical levers) against the Longitundinal Actuation Strength (as measured by PCAL / ESD calibration lines). As has been shown previously (see LHO aLOG 22903), the pitch/yaw strength's slope trends very nicely along with the longituinal stength change -- if you take a quick glance. Upon closer investigation, here are things that one begins to question:
(1) We still don't understand why the optical level actuation strength assessments are offset from the longitunidal strength assessment after the ESD bias sign flip. 
(2) One *could* argue that, although prior to the flip the eye-ball-average of oplev measurements trackes the longitudinal strength, after the flip there are periods where two quadrants (magenta, in pitch, which is LR, from Oct 25 to Nov 8; black, in yaw, which is UR, from ~Nov 11 to Dec 06) track the longitudinal strength. As such, one *could* argue that the longitudinal actuation strength trend is dominated by a single quadrant's charge, instead of the average. Maybe.
(3) If you squint, you *could* say that the longitudinal actuation strength increase rate is slowly tapering off, where as the optical lever strength increase *may* be remaining constant. One could probably also say that the rate of strength increase is different between oplevs and cal lines (oplev P/Y strength is increasing faster that cal line L strength).
All this being said, we are still unsure whether we want to flip the ETMY ESD bias sign again before the observation run is out. Landry suggests we either do it mid-December (say the week of Dec 14), or not at all. So we'll continue to track via optical lever, and compare against the longitudinal estimate from cal lines.

Results continue to look encouraging for ETMX -- ever since we've had great duty cycle, and turned off the ETMX ESD Bias when we're in low-noise and/or when the IFO is down, the charging rate has decreased. Even though the actuation strength of ETMX doesn't matter at the few % level like it does for ETMY (because ETMX is not used as the DARM actuator in nominal low-noise, so it doesn't affect the IFO calibration), it's still good to know that we can get an appreciable effect by simply reducing the bias voltage and/or turning it off for estended periods of time. This again argues for going the LLO route of decreasing the ETMY bias by a factor of 2, which we should certianly consider doing after O1.

---------------
As usual, I've followed the instructions from the aWiki to take the measurements. I had much less trouble today than I had last week gathering data from NDS, which is encouraging. One thing I'd done differently was wait a litle longer before requesting the gathering and analysis (I waited until the *next* measurement had gone through -9.0 and -4.0 [V] bias voltage points and started the 0.0 [V] point, roughly 5 minutes after the measurement I wanted to analyze ended). As such, I was able to get 6 and 4 oplev data point to compose the average for ETMX and ETMY, respectively (as opposed to the 3 and 1 I got last week; see LHO aLOG 23717).

Once all data was analyzed, I created the usual optical-lever-only assessment using 
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/Scripts/Long_Trend.m
and saved the data to here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Results/CAL_PARAM/2015-12-01_H1SUSETMY_ChargeMeasResults.mat

However, I'd asked Sudarshan to gather the latest calibration line estimates of the ESD longitudinal actuation strength (aka kappa_TST), which he gathered from his matlab tool that gathers the output of the GDS function "Standard Line Monitor." (He's promised me an updated procedure and an aLOG so that anyone can do it). This is noteably *not* the output of the GDS pipeline, but the answers should be equivalent. His data lives here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Results/CAL_PARAM/2015-12-01_Sep-Oct-Nov_ALLKappas.mat

Finally, I've made the comparison between oplev and cal live strength estimates using
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Scripts/CAL_PARAM/compare_chargevskappaTST_20151201.m

   Finishing up with maintenance window and getting ready to relock. Nutsinee and Jeff did a sweep of the LVEA. 

Attached are plots of the IOO IMs, IM1-4, and their alignments in pitch and yaw.  Also plots of IM4 Trans pitch and yaw over 90 days.

Plot 1: IM4 Trans pitch and yaw

• - noteable is that at the start of the plot (sept 2nd) the pitch and yaw values were -0.2 and 0.054 respectively
• - change around sept 12th attributed to IM alignment changes, pitch and yaw now -0.330 and 0.095 respectively
• - mostly stable until oct 21st and by oct 29th pitch and yaw have drifted to -0.450 and 0.090 respectively
• - more drift and a change around nov 30th, and current values are -0.486 and 0.065 respectively

Plot 2: IM4 Trans and IM1-4 pitch

• - IM1 pitch changes are 10urad and smaller
• - IM2 pitch changes are 70urad and smaler
• - IM3 pitch changes are 12urad and smaller
• - IM4 folllows

Plot 3: IM4 Trans and IM1-4 pitch

• - IM1 yaw changes are 30urad and smaller
• - IM2 yaw changes are 5urad and smaler
• - IM3 yaw changes are 52urad and smaller - note, the big change near the end of the plot is due to an intentional alignment change
• - IM4 folllows

In all plots, changes can be attributed to both alignment shifts after shaking (HAM2 ISI trips / earthquakes) and intentional alignment adjustments.

Robert and Nutsinee had tested the noise from an additional cleanroom in the Optics Lab in alog 23169.  With Michael's OK, I've turned this cleanroom on and expect it to be on for the duration of O1 as we use it to inventory oustanding hardware.

LLO and LHO use somewhat different RZ blends on St1 of our BSCs. Because the T240s have a RZ coupling to Z drives, we use a high CPS blend to avoid injecting this coupling into the control loops. The blends are shown in my first plot. The low pass CPS (red) is common to both, but LLO uses a CPS/L4C blend ( their L4C high pass is dashed green), while LHO is using a blend that has both the T240 (light blue) and L4C (brown). RichMs seismic log 647 shows that the CPS/L4C ends up injecting a bunch of L4C noise  at low frequency. Arnaud and Rich have worked on testing a CPS/L4C blend that rolls the L4C off more at low frequency, see LLO alog 21941. The blend that LHO uses rolls off the L4C more, but replaces that signal with possibly spurious T240 signal. I tested that this morning and it looks like this is not a problem for LHO. Second plot is the CPS and oplev for ITMX, third plot is L4C and T240, references are with the L4C/CPS RZ blend, the live traces are with the T240/L4C/CPS blend. The CPS shows that the L4C only blend does indeed move a lot more at low frequency, though the oplev doesn't see any difference. The T240 and L4C don't really see a difference, but the T240 is suspect and the L4C is a poor low frequency sensor.

There is one reason why LHO maybe okay with T240s in our RZ blend while LLO may not, we are using HEPI sensor correction to offload low frequency Z isolation ( and thus, drive) to HEPI. Arnaud has also tried lower blends on St1 with L4C/CPS RZ blends succesfully, something I want to test, which may not work as well at LHO because we are using T240s in RZ. I would also like to try Rich's new 750mhz blend, with and without T240s, but all of that will probably wait until after 01.

J. Oberling, P. King

I reset the 35W FE watchdog this morning at 18:24 UTC (10:24 PST).  I also noticed that the crystal chiller was low so I added 125 mL of water to top it off.  While doing that Peter noticed the warning light on the diode chiller that coincides with low water was lit, so we added water until the light went off.

After yesterday's report that CER temperature was high (alog 23826), Bubba made some adjustment of the diverter(???) for CER yesterday, which made the temperature go down by 0.5 C, and RF output level got somewhat higher.

The second attachment shows that the temperature jump on 27/Nov in CER (red vertical lines) didn't coinside with the time they made the adjustment to the air handler (blue vertical lines). Though we don't understand why the temperature went up at that timing, since no catastrophy was observed, and since the temperature seems to be well regulated, I guess we need to operate like this.

Note that the PEM temperature screen is reporting many out-of-tolerance errors including CER and Sup. It doesn't prevent us from going observation, but when we figure out that the current temperature is good, I think we'd better update eiither the tolerance or the nominal temperature.

The beam alignment into the reference cavity was tweaked.  Most of the alignment was done
by adjusting the mirror mounts on the periscope.  The other mounts did not yield as much
gain as the ones on the periscope.  With the pitch adjustments the transmission signal went
from ~0.75 - 0.78 to ~1.16.  Relatively minor tweaks were made to the AOM alignment without
any big improvements, which suggests that the adjustments for the AOM are in the mid-range.
Went back to the periscope adjustments and adjusted yaw which improved things to ~1.2.
Walking the beam in yaw, followed by small pitch adjustments improved the signal to ~1.5
with the HEPA fans on and the ISS unlocked.

The power into the reference cavity was measured to be 30.1 mW - measured with Ophir stick
calorimeter.

Both mounts on the periscope were locked as best as possible.  The transmission signal was
1.52.

The signal on the RFPD was:
unlocked : -245 mV
locked   : -40 mV
offset   : -2 mV

With the ISS on, the reference cavity transmission was measured to be 1.54.

Attached, for reference, is the camera image of the various spots from the cavities.


As an aside, the recent drift in reference cavity transmission seems to coincide with some
jumps in the pre-modecleaner temperature.

Jason, Ed, Peter

This morning before maintenance really took off, we tried switching blends on all of the BSCs, while the IFO was still locked. Contrary to my findings a couple weeks ago (alog 23610), it now seems like it's possible to switch blends while the IFO is locked and not break lock. We started out carefully, switching only the ETMs, one at a time, then the corner station ISIs. We then tried a little faster, doing the corner station all at once, then both ETMs. Finally, we switched all chambers all at once. For each of these tests, we switched from our nominal 90mhz blends to the 45mhz blends then back. The lock survived each switch, although the ASC loops would ring up some, especially when we switched the ETMs.  The corner station ISIs didn't seem to effect ASC as much.

The only IFO difference I know of between the last time I looked at this and now is that Hugh went down and recentered the ETMY's T240s. Environment is also different today, with pretty quiet winds (<10mph) and only moderate microseism (rms < .5 microns).

The attached trends are for the ASC D/C Hard, D/C soft, ETM oplevs and corner station oplevs. Similar to what I found a while ago, ETMY seemed to have the biggest effect on the IFO (based on what we saw on the ASC foms in the control room), although the ITMY oplev actually moved more. Still, the oplevs didn't see more the about 1.5 microradians motion at any point.

You can also tell what blends were running on the traces based on the eye-ball rms of the ASC signals. The 90mhz blends don't filter out the microseism which is moderate today, so the ASC pitch signals get noisier. This is also visible on the oplevs.

Title:  12/01/2015, Day Shift 16:00 – 00:00 (08:00 – 16:00) All times in UTC (PT)
	
State of H1: 16:00 (08:00), The IFO locked at NOMINAL_LOW_NOISE, 22.3w, 79Mpc. In Commissioning mode. 

Outgoing Operator: TJ

Quick Summary:  Start of maintenance window.   

Doubling these limits should virtually eliminate locklosses of the nature reported here.

The SDF has been updated, both OBSERVE and safe files; and they are committed to the svn.

• Title: 12/1 OWL Shift: 08:00-16:00UTC (00:00-8:00PDT), all times posted in UTC
  

• State of H1: Maintenance Tuesday
  

• Shift Summary: Still cruising on a 28 hour lock. The DARM spectrum was getting a tiny bit noisy in frequencies < 50Hz for the last hour or two (that I noticed at least). Since LLO was down and the inpending maintenance day upon us, I didn't do look too far into it.

• Incoming Operator: Jeff B

• Activity Log:

• 15:46 - Out of Observing
• 15:55 - Jeff B into LVEA to take data readings near 3IFO storage area.
• 16:01 - Peter K into PSL enclosure.
• 16:04 - Joe to EY to charge scissor lift
• 16:08 - Jeff B back

Just checking on the reference cavity transmission, which continues to fall.  The ambient
temperature didn't change much.  Doesn't appear to be due to variation in the pre-modecleaner
transmission, nor temperature.

Starting some maintenance tasks since LLO has been out. We are currently still locked, but that won't last for long.

*****
Incident Type
--
Scheduled Outage

Start Date and Time
—
2015-12-15 9:00 CST (UTC-6)

End Date and Time
--
2015-12-15 ~12:00 CST

Service(s) Affected
—
This outage is required to move GraceDB onto new hardware. (GraceDB is currently running on temporary hardware after the unscheduled outage on Nov. 13th.) During the migration, GraceDB will be unavailable for a time period of ~hours.

--
Please direct all questions to uwm-help@gravity.phys.uwm.edu

Observing at 73Mpc for 25 hours.

Environment calm. There have been a handful of glitches, but it doesn't seem like anything out of the ordinary.

• Title: 12/1 OWL Shift: 08:00-16:00UTC (00:00-8:00PDT), all times posted in UTC
  

• State of H1: Observing at 78Mpc for the last 20hrs
  

• Outgoing Operator:  Travis

• Quick Summary: Travis had it easy, still locked from my shift yesterday. Wind minial, useism 0.4 um/s, all lights off, CW inj running, timing error on H1SUSETMY, IPC error on H1ISCEY (I'll clear them when I get the chance).

I'm testing a new commissioning reservation system I wrote this afternoon using python. This is a file based system replacing the old EPICS system. The main reason for the change is that the old EPICS system developed problems related to updates and required a lot of maintenance. It was also awkward to configure and restrictive in what it could do.

The reservation file is /opt/rtcds/lho/h1/cds/reservations.txt

There are three python scripts:

make_reservation.py is available to all users, it allows you to create your reservation

display_reservations.py script loops every second and shows the currently open reservations

decrement_reservations.py script is ran as a cronjob every minute, it decrements the time-to-live of each reservation and deletes them when they expire.

I have a display running on the left control room TV closest to the projector screen.

Here is the usage document for the make_reservation.py script

controls@opsws6:~ 0$ make_reservation.py -h

usage: make_reservation.py [-h] system name task contact length

create a reservation for a system

positional arguments:

  system      the system you are reserving, e.g. model/daq

  name        your name

  task        description of your task

  contact     your contact info (location, phone num)

  length      length of time (d:hh:mm)

optional arguments:

  -h, --help  show this help message and exit

If you need to use spaces, surround the string with quotes. There are no limitations on string contents. Here is an example reservation

      make_reservation.py "PEM and DAQ" david.barker "update PEM models, restart DAQ" "phone 255" 0:2:0