Displaying reports 71761-71780 of 82999.Go to page Start 3585 3586 3587 3588 3589 3590 3591 3592 3593 End
Reports until 17:07, Friday 25 April 2014
H1 CDS
cyrus.reed@LIGO.ORG - posted 17:07, Friday 25 April 2014 (11580)
Workstations

I believe I have ameliorated the wireless problems with the workstations at EX.  Let me know if they continue to misbehave.

Also, I rebooted the dedicated vacuum workstation in the control room since it was running terribly.  It's also had the latest updates applied.

H1 ISC
sheila.dwyer@LIGO.ORG - posted 16:57, Friday 25 April 2014 - last comment - 11:38, Monday 28 April 2014(11579)
ALS DIFF noise

Sheila, Alexa, Stefan, Daniel

Attached is a spectrum, in Hz/rt Hz, of the PLL control singals for ALS diff and COMM.  This looks simliar to what was measured at Livingston last week.

We made changes to the LSC model to route these control signals into the input matrix to allow us to lock ALS DIFF. 

Images attached to this report
Comments related to this report
sheila.dwyer@LIGO.ORG - 11:38, Monday 28 April 2014 (11600)

These are calibrated in Hz, the spectra plotted above.  The first column is frequency, the second is COMM ASD in HZ/rt Hz,the third DIFF ASD in Hz/rt Hz. 

Non-image files attached to this comment
H1 ISC (SEI)
sheila.dwyer@LIGO.ORG - posted 16:52, Friday 25 April 2014 (11578)
LSC model restart tripped HAM2+3

HAM2+3  HEPI and ISIs have tripped along with MC2+PR2.  We have seen similar behavoir before after a beckhoff restart, but this time it was the LSC model. 

The LSC model restart would have killed the guardian, and unlocked the modecleaner, meaning that the integrator at the top stage of MC2 would get saturated, so it makes sense that MC2 tripped.  The ISIs and HEPIs weren't payload trips, so something else is going wrong. 

This probably could have been prevented if I unlocked the mode cleaner and puased the guardian first.

 

Here is an error message from the plotting script failing:

  File "/opt/rtcds/userapps/release//isi/common/scripts/wd_plots/main.py", line 170, in _BufferDict
    abs_threshold_mask=abs_threshold_mask, host=host, port=port)
  File "/opt/rtcds/userapps/trunk/isi/common/scripts/wd_plots/pydv/bufferdict.py", line 243, in __init__
    self.add_channels(channel_names, wd_state_mask=wd_state_mask, abs_threshold_mask=abs_threshold_mask)
  File "/opt/rtcds/userapps/trunk/isi/common/scripts/wd_plots/pydv/bufferdict.py", line 382, in add_channels
    abs_threshold_mask=abs_threshold_mask)
  File "/opt/rtcds/userapps/trunk/isi/common/scripts/wd_plots/pydv/bufferdict.py", line 344, in __fetch_data
    self.conn.clear_cache()  # clear any saved information from a previous connection
RuntimeError: Input/output error
 

Images attached to this report
H1 General
andres.ramirez@LIGO.ORG - posted 15:59, Friday 25 April 2014 (11577)
Ops Shift Summary
9:00- 10:45 Getting ready to remove payload on HAM5 – Hugh and crew
9:05- 10:00 Performing PET swipe at HAM 5 – Jeff  B.
9:25- Doing inventory by the squeezer bay area – Corey
9:43- Moderate dust  alarms  at both end station 
10:00-11:55 Working at End X-Richard
10:06 PSL check (Done)
10:07: 11:30 Heading to End Y to work on dust monitors – Jeff B. 
10:40 Moving laser barriers around the HAM4 TCS table area – Justin/Cris
11:02-12:45 Heading into H2 Laser enclosure to set up the OFI - Gerardo 
12:37 Heading to End X (cleaning) – Chris
12:49-14:16 Heading to Mid Y (cleaning) – Karen
13:27 Running hose from near HAM4 to inside Diode Room – Jeff B.
13:36-14:48 Back to H2 Laser enclosure to set up the OFI - Gerardo
13:44-14:48 Joining Gerardo in H2 Laser enclosure (LVEA) – Mark B.
13:45-14:41 Setting signs around TCS area in LVEA – Justin
14:47 Beckoff power recycling – Matt/Greg
15:25 Heading to End X to fix CDS workstations - Cyrus
LHO VE
kyle.ryan@LIGO.ORG - posted 15:58, Friday 25 April 2014 (11576)
Dumped unpumped volume seen by PT246B into adjacent pumped RGA volume
This exercise will need to be done occasionally until the Y2-1 port is restored to its nominal configuration (i.e., following the removal of the RGA test setup)
H1 SUS (INS, SUS)
richard.mccarthy@LIGO.ORG - posted 13:20, Friday 25 April 2014 (11573)
ETM-X ESD Power up
Finally installed all of the cabling and interlock boxes for the ESD drive.  There is a short cable at the feed through that goes to a current limiting resistor box.  From that box a 5 conduct cable with SHV connectors goes to the ESD amplifier.   The ESD amplifier has +-430V dc and +-18v dc supplied to it.  The HV supply is interlocked to a Vacuum gauge on the chamber.  

One item of note for the installation is the SHV coax cable label 1 goes to ESD amp port 3 and Coax cable 3 goes to ESD amp port 1.  I have used sharpie to mark this.

If the vacuum gauge trips the HV supply or if we have a power outage the HV supplies need to be switched on by hand.  The +430 Volt supply was found in Sink mode.  I am not sure how it arrived in this state because you would have to program the unit to do this and when the unit was turned on this was not done.  WE WILL have to track this to see if it is a problem. 

Before connecting the unit to Vacuum I checked the output values.

With See Table on attached pdf


								

Non-image files attached to this report
H1 SEI (INS)
hugh.radkins@LIGO.ORG - posted 12:08, Friday 25 April 2014 (11572)
WHAM5 SEI Activity/Status--Locked; ISI Off, HEPI Sensors On
HEPI was locked(put on stops) a couple days ago but its sensors remain on.  At the same time, the ISI interface electronics were powered down to allow decabling the air side.
This morning the ISI was locked (with lockers) and then the 800lbs of dummy payload was removed to make room for Suspension installs.
Thanks to Apollo Scott, Mark & Bubba.
H1 SEI
sheila.dwyer@LIGO.ORG - posted 12:04, Friday 25 April 2014 (11571)
still logging trips

ITMX tripped, this might have been a result of Jim's measurement, but I am not sure. 

 

The gps time was 1082487591

H1 ISC
daniel.sigg@LIGO.ORG - posted 10:14, Friday 25 April 2014 (11570)
RF amp added to COMM PLL BBPD

A ZFL-500LNB+ Mini-Circuits amplifier was added to the output of the COMM PLL BBPD. It is mounted directly to the output connector of BBPD using a SMA barrel. This amplifier was measured to have 29dB-30dB of gain in the 80MHz frequency range. Currently, there is a power supply on top of the enclosure. Longer term, we want to splice this into the +/-15V supply running to the BBPD. All other amplifiers were removed from the path.

H1 General
andres.ramirez@LIGO.ORG - posted 09:15, Friday 25 April 2014 (11569)
Installation Meeting Minutes
8:15-8:35

Mike, Terry, Pablo, Daniel, Steban, Vern, Justin, Richard, Bubba, Kiwamu, Jim, Hugh, Mark, Jason, Aaron, Mitchell, Mark B., Keita, Jeff K.

LVEA is Laser HAZARD

HAM4- Cleaning crew in action – Karen and Chris
Craning activity by APOLLO
HAM5 ISI:  Removing payload –Hugh/Apollo 
TCS tables work continues. David/Aidan
TCS racks work at end stations (Richard & crew)
3ifo BSC ISI assembly  work continues in Staging Building – Mitchell
Dust monitors work at end stations. Switching the dust monitor unit in diode room. Jeff B.
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 08:28, Friday 25 April 2014 (11568)
CDS model and DAQ restart report, Thursday 24th April 2014

no restarts reported.

H2 SEI
mitchell.robinson@LIGO.ORG - posted 08:08, Friday 25 April 2014 (11567)
Staging building, 3IFO (unit 2) progress
Jim and I pulled/pushed all of the blade springs and installed flexures on unit 2 yesterday. Parts needed for unit 3 were discovered to be short of needed quantities have been ordered.
H1 ISC
stefan.ballmer@LIGO.ORG - posted 19:22, Thursday 24 April 2014 - last comment - 19:44, Thursday 24 April 2014(11565)
Working towards diff
Alexa, Sheila, Stefan

Our goal today was to get a good diff readout going. For this we
- Commissioned the IMTY and ETMY optical levers, See snapshot.
- Recommissioned the x-arm dither - turns out the phases were tuned up for a different suspension setting - we need configuration control on all the suspension settings. Also see the snaphot.
- With that we got fairly stable arm locking - at least for a while - see below.

- Next we tweaked up the DIFF beat note on ISCT1. We got -20dB signal out of the PD.
- Th PLL locked for short stretches, but essentially always runs out of range after a few seconds.

- Thus we decided to work on top-mass slow feed-back: There was a lot of confusion, but once everything was done right, it sort of worked.
- One thing we noticed along the way, is that our 1-3Hz BLRM traces pick up increases in noise with an roughly hourly periodicity. This noise somehow translates into extra length motion at 0.05Hz. 
- We also fine-tuned the ETMY top mass L2P filter - see Arnaud's log
- The slow feed-back gain was however limited by our main suspension resonance, which meant that we couldn't suppress the DIFF motion enough.
- We thus decided to work on the L2L filters, which should give us the ability to increase the UGF of that loop and get more suppression.
- We got a simple L2L measurement going, but more work is needed.
Images attached to this report
Comments related to this report
arnaud.pele@LIGO.ORG - 19:44, Thursday 24 April 2014 (11566)

Stefan tweaked the L2P decoupling filter to improve (even more!) the top mass to test mass length to pitch decoupling. Basically, the Q of the first resonance of the filter was reduced from 16 to 12.5, (see difference in the attached plots) and this helped reducing the pitch motion, while driving in length, by a factor of ~2. The new filter is loaded in the L2P M0 drivealign matrix bank, and named L2PQ12.5. The old filter is loaded in FM6 as L2P1legacy.

Images attached to this comment
H1 SEI
sheila.dwyer@LIGO.ORG - posted 19:09, Thursday 24 April 2014 (11563)
ETMY ISI

Something is wrong with ETMY stage 2 RX Tbetter....  we clearly have less opLev peak to peak when we turn this to Tcrappy. 

So the configuration we are using now is Tbetter everywhere except Tcrappy on RZ on stage 1 +stage2, and Tcrappy on stage 2 RX, sesnsor correction from the ground to stage 1 in X Y and Z. 

We also briefly tried T750 on stage 1 Z motivated by llo alog 12164, this wasn't good so we will have to do a more thoughfull job of importing those improvements.

H1 SUS
arnaud.pele@LIGO.ORG - posted 18:50, Thursday 24 April 2014 (11555)
ETMY UIM modified coil drivers

Yesterday, the modified UIM coil drivers for ETMY and ETMX were tested in-situ. The transfer functions are showing an average drive increase of ~3.8 for ETMY and ~3.9 for ETMX comparing them before and after, which corresponds to the modification as described in T1400223.
A second test was carried out, using the monitor boards current channels. The test consisted in sending the equivalent of 1V to the coil drivers, to each of the UIM osem channels, and recording the current increase with channel ${QUAD}_L1_FASTIMON_${OSEM}. Jeff K helped me for the calibration of those channels.

The output voltage of the "fast current channel" of the monitor board as described in T1100378 is measured across the resistor Zout. The relation between the current and the ouput voltage is described in the last equation of Jeff's notes attached, with R1/R2 = 1/3 and Zout = 2010 ohms. In other words Current_readback_calibrated (A) = FASTIMON_Readback (cts)* 1/1638.4 (V/cts) * 3/2 * 1/2010 (ohms-1)

For ETMX I measured a transconductance of ~0.6 mA/V for each channel which matches pretty well with the design, but for ETMY it didn't quite match. First, only two channels (even though the mass was moving) were seeing a response, and secondly, the working channels were showing ~3mA increase for 1V drive. Since the transfer function shows that the driver is working as expected we certainly have something going on with the monitor board.

The non functioning channels are LL and UR osems. For UL and LR, when no voltage is sent to the coil driver, the readback sees ~4000 cts (as shown on the screenshot).
 

Images attached to this report
Non-image files attached to this report
LHO VE
kyle.ryan@LIGO.ORG - posted 16:03, Thursday 24 April 2014 (11564)
~1515 hrs. local -> "Burped" unpumped volume seen by PT246B into adjacent RGA volume


			
			
H1 AOS
corey.gray@LIGO.ORG - posted 16:00, Thursday 24 April 2014 (11556)
Ops DAY Summary

Days Activities

 

LHO VE (VE)
corey.gray@LIGO.ORG - posted 12:12, Thursday 24 April 2014 - last comment - 13:56, Thursday 24 April 2014(11559)
MY Pressure Sensor Alarm Level Changed

A pressure sensor at MY had been MAJOR Alarming the last few days, but this is due to it being worked on.  It will be displaying values of a higher pressure for a month or so while it is valved out and being worked on.  To prevent getting alarms from this, we've bumped up the MAJOR alarm setting to 1x10^-6 (originally it would alarm at 5.11x10-8).

Since the Vacuum computer was really slow, Dave ssh-ed into the computer (still was slow) & did the following:

vacuum@control0:~$ caget HVE-MY:Y5_246BTORR.HIHI
HVE-MY:Y5_246BTORR.HIHI        5.11e-08
vacuum@control0:~$ caput HVE-MY:Y5_246BTORR.HIHI 1.00e-06
Old : HVE-MY:Y5_246BTORR.HIHI        5.11e-08
New : HVE-MY:Y5_246BTORR.HIHI        1e-06

We must revert the alarm setting when the VAC work is complete.

Comments related to this report
corey.gray@LIGO.ORG - 13:56, Thursday 24 April 2014 (11562)VE

OK, 1e-6 wasn't good enough (Kyle started baking out RGA components today & this shot up the pressure on this sensor).  John said I could up the Alarm setting to 1e-05, and if it alarms here, then the VAC crew will just power OFF the sensor.

H1 SUS (AOS)
mark.barton@LIGO.ORG - posted 11:37, Wednesday 23 April 2014 - last comment - 13:18, Wednesday 02 July 2014(11530)
OFIS vertical Q adjustment

Mark B. and Gerardo

Yesterday (4/22/14) Gerardo and I measured the vertical mode Q of the OFIS for three different positions of the ECD block to try to get the Q in the specified range of 25-30.

The OFIS was set up on the optical bench in the H2 laser enclosure. The ECD block sits on a tray below the payload which is supported by four groups of vertically pointing screws at accessible positions around the edge of the structure. Gerardo had earlier attempted to set the ECD block at the nominal height using the spacer tool provided but found that this was too high and caused interference. He therefore lowered the block until it was just barely clear plus approximately an extra two turns of the 1/4-20 screws. This was our starting point for further adjustments.

To measure the vertical Q, we used the laser pointer and QPD from the monolithic violin mode setup and used a convenient screw on the top of the payload to partially block the beam. We displayed the "pitch" output of the QPD box on a digital oscilloscope with a 1 sec/div timebase and photographed the screen to capture the data. I read off the peak positions with GraphClick, and worked out the logarithmic decrement and Q with Mathematica.

For the initial position, the Q was 10.7. We lowered the ECD by one turn on all the screws and got Q = 18.9. We lowered the ECD another half turn and got Q = 23.3. Finally, today (4/23/14) we lowered the ECD another 3/4 turn and got 27.8, which is in spec.

Attached is a JPG of the setup, a PDF of all the screenshots, and for the fourth and final run, the Mathematica notebook, PDF thereof and the raw data.

Images attached to this report
Non-image files attached to this report
Comments related to this report
mark.barton@LIGO.ORG - 15:06, Friday 25 April 2014 (11575)AOS

We went back on Friday 4/25 and used the same method to measure the longitudinal (parallel to the OFI beam axis) and transverse mode Qs. For the longitudinal measurement we were able to keep the laser in almost the same position, just clipping a different edge, but for the transverse we had to send the beam on an odd diagonal path clipping one corner and then passing through the hole in the beam dump at the end (see photo). The results were

L: 21.3

T: 15.3

V: 27.8 (from 4/23, above)

The spec is <30 per T1000308-v1, p36, so these Qs look good and we propose to leave it like this.

Images attached to this comment
gerardo.moreno@LIGO.ORG - 10:37, Wednesday 30 April 2014 (11646)

I measured the gap between the copper plate and the magnets, 4 mm and all 4 corners.

mark.barton@LIGO.ORG - 13:18, Wednesday 02 July 2014 (12588)

Per request of Jeff Kissel, I extracted the frequencies from the data of 4/23 and 4/25 for the final configuration of the dampers:

L: f = 0.6211 Hz, Q = 21.3
 
T: f = 0.6248 Hz, Q = 15.3
 
V: f = 1.509 Hz, Q = 27.8
 
As before, L/longitudinal was taken to be along the OFI beam axis (the long axis of the bench).
 
T: 15.3
 
V: 27.8 (from 4/23, above)
 
L: 21.3
 
T: 15.3
 
V: 27.8 (from 4/23, above)
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