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Reports until 12:48, Wednesday 04 November 2015
H1 General
jeffrey.bartlett@LIGO.ORG - posted 12:48, Wednesday 04 November 2015 - last comment - 15:51, Wednesday 04 November 2015(23111)
Lock Loss Recovery II
   After Evan & Filiberto were out of LVEA relocked the IOF on the first attempt with no apparent problems. Ran the A2L script and cleared the SUS SDF notifications. Back to Observing mode at 20:40 (12:40) 

   SDF notification are listed in the attached snapshots. 

NOTE: Still getting RF45 noise and ETMY saturations. Range is being adversely effected 
Images attached to this report
Comments related to this report
jenne.driggers@LIGO.ORG - 15:51, Wednesday 04 November 2015 (23117)

The A2L script was updated yesterday to match the LLO script - the big change was having separate folders for the data for each site, so it's easier to tell which data is from where.  The new folder didn't have write access from the Ops account though, so the A2L script was failing for Jeff.  There are so many EPICS writes and messages during the script that the error message scrolled off the top of the terminal window before he saw it. 

Anyhow, I have chmoded the directory, so it should be fine in the future, but also I have reverted to the P2L and Y2L values that we have been using for the last month or so, since it's not clear that the new values are okay (since the script had some errors part way through).

H1 General
jeffrey.bartlett@LIGO.ORG - posted 12:08, Wednesday 04 November 2015 - last comment - 17:06, Wednesday 04 November 2015(23108)
Ops Day Mid-Shift Summary
Not a generally good morning. 

   IFO broke lock at 16:16 (08:16). After running initial alignment; relocked the IFO and went into Observing mode at 18:25 (10:25). Shortly after relocking started seeing a lot of RF45 noise events at a rate of several per minute. It was decided to have Evan & Filiberto to go into the LVEA to check the RF cabling. 

   While Evan & Filiberto were in the LVEA working on the cabling, the IFO dropped lock. Waiting for them to come out before relocking.
         
Comments related to this report
john.worden@LIGO.ORG - 14:34, Wednesday 04 November 2015 (23112)

RE lockloss at 8:16.

Bubba and I were turning on a few heaters and one of these feeds the output arm (HAM5-6).

The plots show duct temperature near the heater, zone temperature near the floor, and 10 days of zone temperatures.

I have multiplied the Observation_Ready bit by 70 to get it on the same scale as the temperature.

Coincidence?

Images attached to this comment
thomas.shaffer@LIGO.ORG - 15:24, Wednesday 04 November 2015 (23114)

Robert suggested that looking at the OpLevs could give an idea as to if this lockloss could be caused by the temperature. I trended the OpLevs and compared their motion with the LVEA temperatures, and there is definitely some correlation seen on the SR3 OpLev movements and the temp of the LVEA. You could probably make an argument for ITMY and PR3 OpLevs as well, but it is not as clear as the SR3.

So was this temperature excusion the cause of the lockloss? Well, the ASC signals didn't seem to be showing any signs of a problem before lockloss, seismic activity was low to minimal, winds low to minimal, and I didn't see any other obvious culprits.

I attached a trend of some of the CS OpLevs and LVEA temp in a 6 hour window, as well as a group of Lockloss plots with ASC signals and such.

Images attached to this comment
john.worden@LIGO.ORG - 15:49, Wednesday 04 November 2015 (23116)

If air temperature was a factor in this lockloss I would be suspicious of electronics outside the vacuum near HAM5 or 6. I would not expect in-vacuum hardware to respond so promptly.

jenne.driggers@LIGO.ORG - 17:06, Wednesday 04 November 2015 (23123)

[JeffB, Jenne]

After some closer looking, we don't think that the temperature was a direct cause of the locklosss.  By the time the lock was lost, the temperature in FMC-ZONE4 had only changed by a few tenths of a degree - well within our regular diurnal temperature changes. About 16 seconds before the lockloss, SRC2 Pitch and Yaw both started walking away.  I don't know why they started walking away, but there's probably nothing to so about this, other than eventually move the SRC ASC from AS36 to some other signal, as we're planning to do after O1 anyway.

H1 General
jeffrey.bartlett@LIGO.ORG - posted 11:54, Wednesday 04 November 2015 - last comment - 12:13, Wednesday 04 November 2015(23107)
RF45 Noise Return
   After relocking this morning the RF45 noise has come back, at a rate of several time per minute. This is knocking the range down into the high teens and low 20s Mpc. Confer with Evan, Keita, Mike, Daniel, and Filiberto. 

   Set the intent bit to Commissioning while Evan & Filiberto are in the LVEA checking cabling.   
Comments related to this report
evan.hall@LIGO.ORG - 12:13, Wednesday 04 November 2015 (23109)

Fil and I went to the ISC rack and started tapping the 45 MHz cable that comes out of the patch panel. As noted before, this cable is extremely microphonic. Tapping on the coiled-up portion produces huge burps in the EOM driver control signal.

We added some extra velcro around the coil, and then fixed the coil to the rack with some zip ties.

However, now that we have relocked it seems that this does not improve the situation.

H1 General
jeffrey.bartlett@LIGO.ORG - posted 10:49, Wednesday 04 November 2015 - last comment - 12:30, Wednesday 04 November 2015(23103)
Lock Loss Recovery
IFO broke lock at 16:16 (08:16). Cause at this time is unknown. 

During relocking could not move past DRMI_1F. Consulted with Kiwamu and decided to run an initial alignment. IFO was relocked at NLN at 17:47 (09:47). Ran A2L script. There were SDF notifications for both ETMs and ITMs. Could not find a SUS person, so took screenshots and accepted all. Set intent bit to Observing at 18:25.    

Spoke with Hugh about the BSC ST2 Guardian notifications.  
Images attached to this report
Comments related to this report
betsy.weaver@LIGO.ORG - 12:30, Wednesday 04 November 2015 (23110)

Jeff - you've done the correct thing to accept these SDFs, so good.  As Evan says in his 23085 alog, the violin damping buttons were all switched back ON (via gain) this time up in the Guardian.  Also, everytime you run the A2L script we should eye-ball that the values are not crazy different and then accept them in SDF.  Thanks!

H1 PSL (PSL)
richard.savage@LIGO.ORG - posted 09:07, Wednesday 04 November 2015 - last comment - 11:02, Wednesday 04 November 2015(23099)
Humidiy and tmperature trends over the past year using PSL sensors

Pursuant to a discussion on the PSL call this morning, I'm posting trends of the humidity and temperature in the Laser Room, Laser Diode Room, and Chiller Room over the past 365 days.

The humidity sensors are coupled with the temperature sensors.  We have more temperature sensors, but we decided not to record their coupled humidity sensor signals.

Images attached to this report
Comments related to this report
peter.king@LIGO.ORG - 09:26, Wednesday 04 November 2015 (23100)
Just for comparison's sake, a plot of the humidity sensor in the high power oscillator box is included.
Images attached to this comment
matthew.heintze@LIGO.ORG - 11:02, Wednesday 04 November 2015 (23105)

See LLO alog, for comparable plots

H1 PSL (PSL)
peter.king@LIGO.ORG - posted 09:07, Wednesday 04 November 2015 - last comment - 11:02, Wednesday 04 November 2015(23098)
NPRO output power
Attached is a plot of the NPRO output power and the output power of the two pump diodes for the past 4 years.
One can see that the diode current was increased around 8/16/2013 and 6/5/2014.  The first increase in pump
current was about 200 mA; the second about 50 mA.

This NPRO is very close to its "maximum" diode current.
Images attached to this report
Comments related to this report
matthew.heintze@LIGO.ORG - 11:02, Wednesday 04 November 2015 (23106)

See LLO alog for comparison

H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 08:55, Wednesday 04 November 2015 (23097)
CDS model and DAQ restart report, Monday-Tuesday 2nd,3rd November 2015

O1 days 46,47

model restarts logged for Mon 02/Nov/2015 No restarts reported

model restarts logged for Tue 03/Nov/2015
2015_11_03 09:30 h1hpiitmy
2015_11_03 09:30 h1iopseib1
2015_11_03 09:30 h1isiitmy
2015_11_03 10:16 h1isibs
2015_11_03 10:18 h1isiitmx
2015_11_03 10:26 h1isietmx
2015_11_03 10:31 h1isietmy

Maintenance day. Power cycle of h1seib1, new BSC ISI models with reduced sensitivity to coil driver temp status bit when triggering watchdog.

H1 General
jeffrey.bartlett@LIGO.ORG - posted 08:19, Wednesday 04 November 2015 (23096)
Ops Day Shift Transition
Title:  11/04/2015, Day Shift 16:00 – 00:00 (08:00 – 16:00) All times in UTC (PT)
	
State of H1: 16:00 (08:00), The IFO is locked at NOMINAL_LOW_NOISE, in Observing mode 

Outgoing Operator: Jim

Quick Summary:  IFO locked in Observing for the past 9 hours. Winds are calm to light (0 – 3mph), seismic activity is quiet; microseism is centered around 0.3 um/s.   

     


A
LHO FMCS
bubba.gateley@LIGO.ORG - posted 08:06, Wednesday 04 November 2015 (23095)
Quarterly Supply Fan Lubrication
Apologizes for the late entry.

Yesterday all site supply fans were lubricated per the quarterly schedule.

We also took the maintenance period opportunity to change some extremely dirty air filters which are located in the supply fan areas.
H1 AOS
jim.warner@LIGO.ORG - posted 07:53, Wednesday 04 November 2015 (23094)
Shift Summary
TITLE: 11/03 Owl: 8:00-16:00 UTC 
STATE Of H1: Observing @ ~75 MPc.
SHIFT SUMMARY: 
SUPPORT:
ACTIVITY LOG:

H1 was locked when I arrived, RF45 was acting up occasionally, though. Otherwise quiet shift.

15:00 UTC Started receiving CS temp notifications, Bubba notified/working on it.
H1 General
jim.warner@LIGO.ORG - posted 07:51, Wednesday 04 November 2015 (23093)
Temps low in corner station

This morning about 15:00 UTC, I got a couple notifications that temps were low in the LVEA. I let Bubba know, but he was already working on it. I haven't heard any notifications since, Bubba said he will keep an eye on it.

H1 OpsInfo (ISC)
evan.hall@LIGO.ORG - posted 18:55, Tuesday 03 November 2015 - last comment - 20:33, Friday 13 November 2015(23085)
ITM violin mode damping temporarily turned off

I have turned off the violin mode damping filters for IX and IY by zeroing their gains. Patrick accepted these into SDF so that we can go to observing.

This is meant to be temporary, i.e., for this one lock only.

The next time the interferometer comes into lock, the Guardian will turn on the normal violin mode damping settings. These settings will appear as SDF diffs (two on IX, and six on IY). These should be accepted into SDF.

 

We do not expect these modes to ring up during the course of the lock. However, if the mode height on the control room DARM spectrum around 500 Hz rises above 10−16 m/rtHz, the damping should be turned back on:

  1. Make sure the ramp times for the damping filter modules are at least a few seconds (currently they seem to be set to 10 s).
  2. The filters should already be configured to provide the right damping phase, so changing the filters should not be necessary.
  3. Start typing in gain settings. Refer to the values listed below. If the violin mode amplitude is much much higher than usual (e.g., it's off the scale on the control room DARM spectrum), it is wise to start with a small gain (e.g, gain of ±1) in order to make sure the suspension drive does not saturate. Then you can increase the gain in several steps, until the nominal setting is achieved.

A screenshot of the nominal IY damping settings is attached (I didn't take one for IX).

ITMX:

ITMY

Images attached to this report
Comments related to this report
evan.hall@LIGO.ORG - 11:14, Wednesday 04 November 2015 (23102)

Thanks to Jeff, Patrick, and Jim for babysitting this.

The second lock (after the earthquake) lasted about 10 hours. Strangely, the ITM first harmonics (which range from 500 to 505 Hz) do not all seem to ring down.

Non-image files attached to this comment
borja.sorazu@LIGO.ORG - 19:29, Wednesday 11 November 2015 (23332)

An analysis of this data to measure Q of the fundamental modes for ITMX and ITMY violin modes is reported in 23331. The few modes that show an actual ringdown have a Q of about 0.3e9.

borja.sorazu@LIGO.ORG - 20:33, Friday 13 November 2015 (23384)

An analysis of this data to measure Q of the 2nd harmonics for ITMX and ITMY violin modes is reported in 23383.

H1 AOS
jeffrey.kissel@LIGO.ORG - posted 13:52, Wednesday 30 September 2015 - last comment - 10:03, Wednesday 04 November 2015(22117)
Updated CAL-CS DELTAL EXTERNAL Delay Explanation Diagram
Now that we've cleaned up all of our systematics from the DARM model and released the O1 version (see LHO aLOG 22056, I've updated the diagram that explains how the actuation path clock cycle delay is derived, and also shows that the current value of 7 [clock cycles] or 427.3 [us] that was recently installed at both sites (LHO aLOG 21788) still does a fine job at approximating the total delay between the inverse sensing and actuation chains.
Images attached to this report
Non-image files attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 10:03, Wednesday 04 November 2015 (23101)
A good diagram on the timing of a hardware injection through the DARM path:
LLO aLOG 22361
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