aLIGO LHO Logbook

H1 PSL (PSL)

cheryl.vorvick@LIGO.ORG - posted 12:58, Tuesday 30 April 2019 (48875)

PSL temperature tuning after incursion

After exiting the PSL, we watched the PSL temperatures, and waited until they were close to their nominal values, before fully tuning the PSL HVAC to Commissioning Mode.

18:00 UTC - approximate time we left the PSL
18:10 UTC - the PSL room fans were turned off (make-up air still on, the typical config.) - image 1
18:29 UTC - the AC units were turned off (PSL to Science Mode) - image 2
- PSL North temperature 73.4F, nominal of 73.7F, delta of -0.3F
- PSL South temperature 72.9F, nominal of 73.0F, delta of -0.1F
- we chose to go a bit negative in temperature, since the temperatures increase when we first enter Science Mode
19:02 UTC - the PSL has been in Science Mode for about 30 minutes - image 3
- PSL North temperature 73.9F, nominal of 73.7F, delta of +0.2F
- PSL South temperature 72.95F, nominal of 73.0F, delta of -0.05F
19:27 UTC - the PSL temperatures and the PMC signals, showing signals since the start of Maintenance (4+ hours) - image 4
- center bottom plot is PMC TRANS, which has recovered it's pre-incursion power level (far left in the plot)
- bottom right plot is PMC REFL, which is showing that it has not yet returned to it's pre-incursion level, but is on a slope toward that value
- bottom left plot, center second-from-bottom plot, and right second-from-top plot are all showing a pitch change in the beam, from the PMC and through the IO path
- left second-from-top and right top plots show the PSL North and South temperatures, which have both risen
- PSL North temperature 74.0F, nominal of 73.7F, delta of +0.3F
- PSL South temperature 73.15F, nominal of 73.0F, delta of +0.15F
- still a better result than random PSL HVAC transition

- Jason, Cheryl

Images attached to this report

H1 PSL

Link

jason.oberling@LIGO.ORG - posted 11:55, Tuesday 30 April 2019 - last comment - 08:50, Friday 03 May 2019(48871)

PSL Work Today (WP 8188 & FAMIS 10708)

WP 8188

I made I slight adjustment to the light level on the PMC locking PD to hopefully alleviate the constant increase in the relock counter we've been seeing lately (LHO alog 48568 & FRS 12753). I began by tweaking the alignment into the PMC locking PD, which did not change the PD voltage. I then slightly tweaked the TFP directly in front of the PD to increase the PD voltage; this had a small effect on the PD voltage. The changes are:

Before:
- Min: 6mV
- Max: 8mV
After:
- Min: 10mV
- Max: 12mV

I did not change the PMC gain. I reset the PMC relock counter at 18:44 UTC (11:44 PDT) and will monitor this over the next few days before closing the work permit.

FAMIS 10708

Both PSL power watchdogs were reset at 18:35 UTC (11:35 PDT). This completes FAMIS 10708.

Other Work

I happened to notice that the ISS diffraction % was at ~1.7% with the just the 1st loop locked; the diffracted power should be between 2% and 3%. I changed the ISS Reference Signal from -2.08 V to -2.07 V; this brought the diffraction % to ~2.1%. The change was accepted in both the SAFE and OBSERVE SDF files.

Comments related to this report

jason.oberling@LIGO.ORG - 08:50, Friday 03 May 2019 (48961)

Link

In almost 3 days there have been 0 relocks on the PMC, see attached. Increasing the light level on the diode cured the behavior. This closes WP 8188 and FRS 12753.

Images attached to this comment

LHO General

Link

thomas.shaffer@LIGO.ORG - posted 11:50, Tuesday 30 April 2019 (48872)

Tuesday Maintenance Update

Maintenance activities are done for the day, and we are beginning to lock.

LVEA, EYVEA have been swept

H1 SUS

Link

rahul.kumar@LIGO.ORG - posted 10:40, Tuesday 30 April 2019 (48869)

OPLEV charge measurements on ETMX and ETMY

The results for this weeks charge measurements are attached below. For the ETMX, the effective bias voltage is spread (quadrant wise) between 0-25V. The long term trends looks to be stable and has not changed past several weeks. For the ETMY, the effective bias values are very close to zero, not much accumulations which is once again consistent with long term results.

I have restored all the values after the measurements were done, and have also checked for any SDF difference (bias offset was once again OFF for ETMX- which I turned it ON).

Images attached to this report

H1 CDS

Link

david.barker@LIGO.ORG - posted 10:10, Tuesday 30 April 2019 (48868)

bypass of end station chiller alarms while maintenance is ongoing

Bubba, Dave:

While Bubba is doing chiller maintenance this morning I've bypassed the supply H20 temp alarms:

Bypass will expire:
Tue Apr 30 12:06:22 PDT 2019
For channel(s):
H0:FMC-EX_CY_H2O_SUP_DEGF
H0:FMC-EY_CY_H2O_SUP_DEGF

LHO General

Link

ryan.blair@LIGO.ORG - posted 09:52, Tuesday 30 April 2019 - last comment - 11:20, Tuesday 30 April 2019(48866)

WP#8185 maintenance being performed (external network connection reconfiguration)

Maintenance for WP#8185 is beginning shortly (at 10:00 AM Pacific / 17:00 UTC). There may be a brief loss of external network connectivity while this work is being performed.

Comments related to this report

ryan.blair@LIGO.ORG - 11:20, Tuesday 30 April 2019 (48870)

Link

Work has been completed.

H1 TCS

Link

thomas.shaffer@LIGO.ORG - posted 09:13, Tuesday 30 April 2019 (48862)

Tested out TCS CO2 common guardian code

WP8189

LLO graciously made the TCS CO2 guardian code common again after it had diverted some years ago. I tested it out today and it all seemed to work well.

I had to remove some tabs and made some indents consistent to 4 spaces, but that was the only update I made.

H1 ISC (SYS)

Link

jenne.driggers@LIGO.ORG - posted 08:39, Tuesday 30 April 2019 (48861)

Quick SDF survey in DOWN, just after NLN lockloss

We just broke lock for maintenance, and TJ caught the guardian to hold it in READY just after it had completed DOWN and PREP_FOR_LOCKING. Before anything else changed, I did a quick survey of all the SUS and ISC SDFs and accepted all of the diffs that seemed appropriate. Since some seismic state things had been changed with the seismic guardian, I did not accept any diffs for SEI. But, other than SEI everything is pretty well reconciled. I hope that this will help in case we get some kind of power outage or accidental computer reboots, or in a case like this weekend where we got stuck due to some subtle filter switches that were off.

LHO General

Link

thomas.shaffer@LIGO.ORG - posted 08:11, Tuesday 30 April 2019 (48860)

Ops Day Shift Transition

TITLE: 04/30 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
OUTGOING OPERATOR: Travis
CURRENT ENVIRONMENT:
    Wind: 13mph Gusts, 11mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY: Still locked but maintenance has started

H1 General

Link

travis.sadecki@LIGO.ORG - posted 08:00, Tuesday 30 April 2019 (48859)

Ops Owl Shift Summary

TITLE: 04/30 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Calibration
INCOMING OPERATOR: TJ
SHIFT SUMMARY: Lock is 35 hours old.
LOG:

14:45 Out of Observing to run PEM injection script.

14:56 PEM injections done, put into Preventative Maintenance

H1 General

Link

travis.sadecki@LIGO.ORG - posted 00:04, Tuesday 30 April 2019 (48858)

Ops Owl Shift Transition

TITLE: 04/30 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 106Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 17mph Gusts, 11mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY: Lock is 27 hours old.

H1 General

Link

jim.warner@LIGO.ORG - posted 23:57, Monday 29 April 2019 (48855)

Shift Summary

TITLE: 04/30 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Travis
SHIFT SUMMARY:
LOG:
1:00 Georgia does some phasing measurement, commissioning for ~45mins

H1 ISC (ISC)

Link

georgia.mansell@LIGO.ORG - posted 19:02, Monday 29 April 2019 - last comment - 14:42, Tuesday 30 April 2019(48857)

ASC-AS_A_RF36 re-phased, ASC oscillation gone

All day today the 2-minute-period oscillation in the yaw ASC loops persisted. We tried turning off the ADS loops, this had no effect. We tried lowering the gain of the SRC1 loop, this did nothing.

We decided to re-phase sensor for the beamsplitter ASC (AS_A_RF36_Q), since:

it was clearly affected by the SR3 heater change (looking at the I-phase during the heating)
Keita looked at the spectrum of the I and Q, pit and yaw outputs at frequencies where the beamsplitter had real motion (known by looking at the oplev) and saw the the phasing wasn't good.

I added ~25 degrees to each quadrant, (now all around 225 degrees). This stopped our ASC oscillation, and increased our 9MHz build up (POPAIR_B_RF18) freom ~42 to ~45. There might be more improvements to be had by turning up the phase further, I just stopped here since the rest of the ASC was taking a while to catch up.

Comments related to this report

jenne.driggers@LIGO.ORG - 14:42, Tuesday 30 April 2019 (48878)

Link

We're struggling to lock, and seeing some ASC oscillations, so I've reverted this change for now.

H1 SEI

Link

jim.warner@LIGO.ORG - posted 16:13, Monday 29 April 2019 (48854)

Weekly ISI CPS Spectra

ITMX has one St2 sensor that is getting pretty noisy, has been elevated for a while. We should address this soon.

Images attached to this report

H1 General

Link

yannick.lecoeuche@LIGO.ORG - posted 16:01, Monday 29 April 2019 (48853)

Shift Summary - Day

TITLE: 04/29 Day Shift 15:00 – 23:00 (08:00 -16:00), all times posted in UTC

STATE of H1: Observing

INCOMING OPERATOR: Jim

SHIFT SUMMARY: Stayed locked at ~110 Mpc for the entirety of the shift. Commissioners have been working on the ~2-minute oscillations in the ASC signals.

LOG:

15:00 (08:00) Start of shift

15:18 (08:18) Jeff to garb room -- put up signs

15:26 (08:26) Jeff back from garb room

15:47 (08:47) Corey to Mechanical Building -- check TCS chillers, HEPI levels

15:58 (08:58) Corey back from Mechanical Building

17:00 (10:00) Kyle to MX

17:09 (10:09) Christina, Vanessa to MX, MY

18:12 (11:12) Vanessa to MX

18:21 (11:21) Kyle back from MX, going to MY

19:09 (12:09) Kyle back from MY

19:30 (12:30) Christina back from MX

19:35 (12:35) Received notice of Hanford emergency system test

20:58 (13:58) Intention bit went to commissioning after SQZ lost lock, regained in less than a minute

20:59 (13:59) Back to Observing

22:24 (15:24) Kyle going to MX to MY

22:44 (15:44) Briefly out of Observing to make a SRC yaw change

22:44 (15:44) Back to Observing

23:00 (16:00) End of shift

H1 AOS (DetChar, PSL)

Link

pep.covas@LIGO.ORG - posted 13:07, Monday 29 April 2019 - last comment - 09:28, Thursday 02 May 2019(48850)

Bump in DARM at 540 Hz

I've been looking at the bump around 540 Hz which can be seen with long integrations (1800 s), see first attachment.

I ran a BruCo job to try to find coherences (results here https://ldas-jobs.ligo-wa.caltech.edu/~pep.covas/bruco/bruco_1240272018/), and some channels related to PSL (ISS), HPI and ISI showed high values. These are the top 20 channels found by BruCo and their coherence:

540.12

HPI-HAM1_TT
_L4C_Z_DQ
(0.79)

ISI-HAM6_GS13INF
_H1_IN1
_DQ
(0.78)

HPI-HAM1_TT
_L4C_RX_DQ
(0.78)

ISI-HAM6_BLND
_GS13RZ
_IN1_DQ
(0.77)

PEM-CS_ADC
_5_18_2K_OUT
_DQ
(0.77)

PSL-ISS_PDB
_REL_OUT_DQ
(0.77)

PSL-ISS_SECONDLOOP
_RIN
_CTRL_OUT
_DQ
(0.77)

PSL-ISS_SECONDLOOP
_OUTPUT
_DQ
(0.77)

HPI-HAM1_TT
_L4CINF_V2
_IN1_DQ
(0.77)

PSL-ISS_SECONDLOOP
_RIN
_ERR1_OUT
_DQ
(0.77)

HPI-HAM1_TT
_L4CINF_V3
_IN1_DQ
(0.77)

PSL-ISS_SECONDLOOP
_ERR1
_DQ
(0.77)

ISI-ETMX_ST1
_L4CINF_V3
_IN1_DQ
(0.76)

ISI-ETMX_ST1
_MASTER_H1
_DRIVE_DQ
(0.76)

ISI-ETMX_ST1
_L4CINF_H3
_IN1_DQ
(0.76)

The second attachment shows a DTT plot showing some power spectrums and some coherence traces. A region of high coherence between approximately 539.7 and 540.3 Hz can be seen, and also a bump at these channels at the same frequencies as in DARM. It shows both curves from 27 March and 27 April (refs), which show very similar features. This bump seems to be a stable feature in DARM

Images attached to this report

Comments related to this report

pep.covas@LIGO.ORG - 14:35, Monday 29 April 2019 (48852)

Link

A similar but much wider bump between 465 and 485 Hz (first attachment) also has coherence with some other channels, for example:

476.62

IMC-WFS_B_Q
_PIT_OUT_DQ
(0.70)

IMC-WFS_B_Q3
_ERR_DQ
(0.70)

IMC-DOF_4_P
_IN1_DQ
(0.68)

IMC-WFS_B_DC
_PIT_OUT
_DQ
(0.68)

IMC-WFS_B_Q4
_ERR_DQ
(0.68)

IMC-WFS_A_DC
_PIT_OUT
_DQ
(0.68)

IMC-WFS_A_DC
_YAW_OUT
_DQ
(0.67)

PEM-CS_ACC
_PSL_PERISCOPE
_X_DQ
(0.67)

IMC-WFS_B_Q
_YAW_OUT_DQ
(0.66)

IMC-WFS_B_Q1
_ERR_DQ
(0.65)

PEM-CS_ACC
_PSL_PERISCOPE
_Y_DQ
(0.65)

IMC-WFS_B_Q2
_ERR_DQ
(0.64)

IMC-WFS_B_I4
_ERR_DQ
(0.63)

PEM-CS_ACC
_PSL_TABLE1
_Z_DQ
(0.62)

IMC-F_OUT_DQ
(0.61)

476.75

IMC-WFS_B_Q
_PIT_OUT_DQ
(0.78)

PEM-CS_ACC
_PSL_TABLE1
_Z_DQ
(0.76)

IMC-WFS_B_Q3
_ERR_DQ
(0.76)

IMC-WFS_A_DC
_PIT_OUT
_DQ
(0.75)

IMC-DOF_2_P
_IN1_DQ
(0.75)

PEM-CS_ACC
_PSL_PERISCOPE
_Y_DQ
(0.75)

IMC-DOF_4_P
_IN1_DQ
(0.74)

IMC-WFS_B_DC
_PIT_OUT
_DQ
(0.74)

IMC-WFS_B_Q1
_ERR_DQ
(0.74)

IMC-F_OUT_DQ
(0.74)

IMC-F_IN1_DQ
(0.74)

SQZ-OPO_FREQ
_OUT_DQ
(0.74)

SQZ-PSL_FF
_OUT_DQ
(0.74)

PEM-CS_ACC
_PSL_PERISCOPE
_X_DQ
(0.74)

IMC-L_IN1_DQ
(0.74)

The second attachment again shows the power spectrum and coherence with some channels. You can see an increase in coherence around this same frequency range, with all channels compared showing similar behaviour.

This being a 20 Hz wide feature, it would be interesting to try to do more studies in order to get rid of this, if possible.

Images attached to this comment

jenne.driggers@LIGO.ORG - 09:22, Tuesday 30 April 2019 (48865)

Link

Particularly since the ISS channels are coherent with the ISI, Pep and I talked about this being potentially beam motion that is then coupling in to the ISS second loop, which is then putting it onto the 1st loop. The attached figure shows that while we're in lock, the second loop QPD is near one of the edges in pitch. Note however that when we have just the IMC and not the full IFO that the QPD doesn't look centered. So, I want to move the spot during an IMC-only time the amount that I think it needs for full lock - I don't want to actually center the beam while we have IMC only.

jenne.driggers@LIGO.ORG - 11:55, Tuesday 30 April 2019 (48874)

Link

[Pep, Jenne]

We move the picomotors in front of the ISS second loop array by +0.8 in pitch and +0.47 in yaw, such that the beam should be centered when we're in full IFO 35W lock. On the HAM2+oplev picomotor controller, we mostly used the picomotor channel 8 (PSL ISS QPD/PD (PM5)) to do the centering, and then checked with channel 1 (PSL ISS QPD/PD (PM1)) that there was no change in the SUM if we moved a few fractions of a beam diameter. This check helped us feel more confident that the beam is not clipping. Pep will check if there is an improvement in this coupling, once we're relocked.

Images attached to this comment

pep.covas@LIGO.ORG - 09:28, Thursday 02 May 2019 (48928)

Link

After the changes made this Tuesday, the noise floor has improved (see here https://ldas-jobs.ligo-wa.caltech.edu/~pep.covas/O3/AfterPSLPicomotor/Comparison.png), but it could be better. We have used again the picomotors (mostly in YAW) while at 35 W to try to make a better improvement.

H1 DetChar (DetChar, ISC, SQZ)

Link

andrew.lundgren@LIGO.ORG - posted 08:02, Friday 26 April 2019 - last comment - 18:15, Monday 29 April 2019(48772)

Slowly wandering line from squeezer

A slowly wandering line in h(t) on April 21 between 60 and 120 Hz appears to come from the squeezer.

The line was noticed in Edgard Bonilla's DQ shift (wiki link). It appears on at least two other days. It's subtle and hard to notice, but a spectrogram of the bucket captures it (first attachment). Zooming in on an hour, we can match h(t) up with some of the squeezer channels. The second attachment is an hour of h(t). The third is a squeezer channel where this line, and others, are very bright. The highest of the lines also just barely appears in h(t).

I don't think this is pickup from DARM because the lines are much more prominent in the squeezer. We haven't yet tried to track where in the squeezer these might originate; I wanted to just quickly document that this is happening.

Images attached to this report

Comments related to this report

robert.schofield@LIGO.ORG - 08:20, Friday 26 April 2019 (48781)

Link

Did you get a chance to check the accelerometers on the tables (ISCT6 and SQZT6 - sensor maps at PEM.LIGO.ORG)?

beverly.berger@LIGO.ORG - 09:23, Friday 26 April 2019 (48784)

Link

The wandering squeezer line seems stronger today (26 April) (see Fig. 1). The next two images are the same as Andy's above but for today. Note how strong the lines are in the SQZ channel. The final two figures are the accelerometers suggested by Robert.

Images attached to this comment

andrew.lundgren@LIGO.ORG - 09:30, Friday 26 April 2019 (48785)DetChar

Link

I don't see anything in the squeezer or ISCT6 accelerometer over the time in these plots.

sharan.banagiri@LIGO.ORG - 18:15, Monday 29 April 2019 (48856)

Link

Strong wandering lines seen today (29th April) too. They stay in DARM for intervals of ~30 - 60 min. I see the same trends as described before - the wandering line appears in H1:SQZ-OMC_TRANS_RF3_Q_NORM, but not in any of the accelerometer channels. I attach a pdf with some spectrograms.

Non-image files attached to this comment

Wandreing_SQZ_Line.pdf

H1 ISC (ISC)

Link

marc.pirello@LIGO.ORG - posted 14:15, Tuesday 02 April 2019 - last comment - 13:49, Tuesday 02 July 2019(48165)

Installed new v3 Baluns in CER

M. Pirello, D. Gustafson

We installed new v3 Baluns on the following signals in the CER:

ISC-C3(37-1) 40Mhz TCS AOM Return exchanged v1-117 with v3-S002

ISC-C3(33-4) 158.8Mhz Fiber Beat Note Return exchanged v1-193 with v3-S003

ISC-C3(33-5) 79.4Mhz SQZ VCO Return exchanged v1-151 with v3-S004

ISC-C3(33-6) 203.125MHz SQZ VCXO Return exchanged v1-052 with v3-S005

ISC-C4(39-3) 79.4MHz PSL VCO Return exchanged v1-093 with v3-S010

These are all return signals, the impact should be minimal. Work was completed per WP8150

Balun status can be seen here E1900100.

Comments related to this report

marc.pirello@LIGO.ORG - 11:55, Tuesday 30 April 2019 (48873)

Link

Continuing the Balun exchange program:

We installed new v3 Baluns on the following signals in the CER:

ISC-C4(39-1) 79.4MHz "ALS DIFF VCO Return" exchanged v1-102 with v3-S006

ISC-C4(39-2) 79.4MHz "ALS COMM VCO Return" exchanged v1-094 with v3-S068

ISC-C4(26-2) 45.5MHz "PEM Readback for Antenna Demod" exchanged v1-055 with v3-S009

ISC-C4(19-8) 9.1MHz "PEM Readback for Antenna Demod" exchanged v1-147 with v3-S116

Work was completed per WP8190. WP was modified to reduce impact to the IFO during this weeks maintenance, we did not touch squeezer.

Balun status can be seen here E1900100 .

marc.pirello@LIGO.ORG - 15:26, Tuesday 07 May 2019 (49074)

Link

Continuing the Balun exchange Program:

We installed new V3 baluns on the following 45MHz signals in the LVEA:

ISC-R1 (41-6) 45MHz Auxiliary Modulation (EOM Driver) exchanged v2-DG146 with v3-S152

ISC-R2 (41-2) 45MHz Distribution exchanged v2-DG083 with v3-S094

ISC-R3 (41-3) 45MHz Distribution exchanged v1-145 with v3-S117

Work was completed per WP8200, balun status can be seen here E1900100.

I have attached Insertion Loss and Leakage scans from the old baluns as well as the new ones.

Images attached to this comment

marc.pirello@LIGO.ORG - 12:10, Tuesday 21 May 2019 (49379)ISC

Link

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the PSL racks and at HAM6:

PSL-R2 (18-2) ISS AOM 80MHz exchanged DG-104 with v3-S069

ISC-R3 (41-2) Distribution 4th Harmonic exchanged v1-053 with v3-S160

ISC-R3 (41-4) Distribution 8th Harmonic exchanged v1-091 with v3-S040

ISC-R3 (39-4) Distribution 42.2MHz exchanged v1-125 with v3-S060

Work was completed per WP8215, balun status is in the same place it was last week, E1900100.

Attached is a comparision between the balun modified by hand (DG-104), and the new v3 balun which replaced it.

Images attached to this comment

marc.pirello@LIGO.ORG - 16:31, Tuesday 14 May 2019 (49243)

Link

M. Pirello, P. King, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the PSL racks:

PSL-R2(17-1) FSS Modulation exchanged v1-043 with v3-S157

PSL-R2(17-2) FSS exchanged v1-014 with v3-S093

PSL-R2(17-4) PMC Modulation exchanged v1-021 with v3-S115

PSL-R2(17-5) PMC exchanged v1-050 with v3-S156

PSL-R2(17-6) Injection Locking exchanged v1-084 with v3-S095

ISC-R1(41-2) Distribution JAC Future exchanged v1-159 with v3-S092

** On the last one, the labels on the feed through may be more correct than the DCC. I followed the cable path to the ALS VCO for the PSL.

If it is the ALS VCO, Peter told me that it is possibly 80MHz and in this case the difference between V1 and V3 is about 0.75dB more power, and no measurable difference in phase. The PSL signals being under 45Mhz should be less than 1 degree difference in phase, and less than 0.25dB difference in power.

Work was completed per WP8208, balun status is in the same place it was last week, E1900100.

I have attached insertion loss and leakage scans of v1 vs v3 baluns.

Images attached to this comment

marc.pirello@LIGO.ORG - 13:54, Thursday 16 May 2019 (49283)

Link

We checked the ISC-R1 (41-2) Balun and determined this signal is the REFL_B demod, 9MHz. There should be very little phase & power difference between V1 and V3 baluns at this frequency.

marc.pirello@LIGO.ORG - 14:09, Tuesday 28 May 2019 (49507)

Link

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the end stations.

EX-ISC-C1 (41-5) Return PLL Beat Note 39.5MHz exchanged v1-176 with v3-S050

EX-ISC-C1 (41-6) Return ALS Laser VCO 79.4Mhz exchanged v1-049 with v3-S042

EX-ISC-R1 (41-1) ALS Laser VCO 71MHz exchanged v1-189 with v3-S114

EX-ISC-C1 (41-5) Return PLL Beat Note 39.5MHz exchanged v1-137 with v3-S041

EX-ISC-C1 (41-6) Return ALS Laser VCO 79.4Mhz exchanged v1-199 with v3-S155

EX-ISC-R1 (41-1) ALS Laser VCO 71MHz exchanged v1-039 with v3-S059

Work was completed per WP8222, balun status is in the same place it was last week, E1900100.

marc.pirello@LIGO.ORG - 11:14, Tuesday 04 June 2019 (49644)

Link

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the Squeezer

ISC-R3 (39-1) 80MHz SQZ EOM (OPO) exchanged v1-178 with v3-S082

ISC-R3 (39-2) 35.5MHz SQZ EOM (SHG) exchanged v1-060 with v3-S089

ISC-R3 (39-3) 200MHz SQZ EOM (CLF) exchanged v1-166 with v3-S031

SQZ-R1 (41-1) 80MHz OPO Demodulation exchanged v-122 with v3-S084

SQZ-R1 (41-2) 35.5MHz SHG Demodulation exchanged v1-020 with v3-S033

SQZ-R1 (39-3) 71MHz SQZ VCO Laser Locking exchanged v1-190 with v3-S083

Work was completed per WP 8230, balun status is in the same place it was last week, E1900100.

** The 200MHz SQZ EOM CLF signal may require a slight phase change, about 8 degrees difference and 2dB more power with the V3.

marc.pirello@LIGO.ORG - 14:09, Tuesday 11 June 2019 (49820)

Link

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the Squeezer and the PSL racks:

SQZ-R1 (41-3) 3.125MHz SQZ Angle Demodulation exchanged v1-171 with v3-S108

SQZ-R1 (41-4) 3.125MHz SQZ Angle Demodulation exchanged v1-145 with v3-S109

SQZ-R1 (41-5) 6.25MHz CLF Demodulation exchanged v1-183 with v3-S085

ISC-R1 (41-1) 71MHz Distribution exchanged DG-02 with v3-S086

ISC-R1 (41-3) 15th Harmonic Modulation exchanged DG-01 with v3-S058

TCS-MEZ (41-1) TCS exchanged v1-153 with v3-S079

Work was completed per WP 8240, balun status is in the same place it was last week, E1900100.

marc.pirello@LIGO.ORG - 10:17, Tuesday 18 June 2019 (50025)

Link

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the field racks near the PSL:

ISC-R2 (41-1) 9MHz Distribution exchanged v1-047 with v3 S019

ISC-R2 (41-3) 2nd Harmnonic Distribution exchanged v1-098 with v3-S019

ISC-R2 (41-4) 3rd Harmonic Distribution exchanged v1-157 with v3-S015

ISC-R2 (41-5) 10th Harmonic Distribution exchanged v1-179 with v3-S016

ISC-R2 (41-6) 15th Harmonic Distribution exchanged v1-074 with v3-S132

ISC-R1 (41-4) 24MHz MC Distribution exchanged v1-040 with v3-S017

ISC-R1 (41-5) 9MHz Main Modulation exchanged v1-033 with v3-S018

Work was completed per WP 8244, balun status located at this link: E1900100. This concludes all "known" balun work at the corner station. We are sprinting to next week where we intend to replace the remaining twelve v1 baluns at the end stations.

marc.pirello@LIGO.ORG - 16:15, Tuesday 25 June 2019 (50184)

Link

M. Pirello, D. Gustafson

Continuing the Balun exchange Program, we installed new v3 baluns on the following signals at both end stations:

EX

ISC-R1 (41-2) 24.4MHz Modulation exchanged v1-022 with v3-S074

ISC-R1 (41-3) 24.4MHz Demodulation exchanged v1-184 with v3-S131

ISC-R1 (41-4) Not Connected exchanged v1-064 with v3-S078

ISC-R1 (39-1) 24.4 WFS A Demod exchanged v1-077 with v3-119

ISC-R1 (39-2) 24.4 WFS B Demode exchanged v1-026 with v3-S076

ISC-R1 (39-3) 71 CPS Timing Fanout exchanged v1-059 with v3-S020

EY

ISC-R1 (41-2) 24.4MHz Modulation exchanged v1-127 with v3-S073

ISC-R1 (41-3) 24.4MHz Demodulation exchanged v1-118 with v3-S011

ISC-R1 (41-4) Not Connected exchanged v1-013 with v3-S012

ISC-R1 (39-1) 24.4 WFS A Demod exchanged v1-126 with v3-S075

ISC-R1 (39-2) 24.4 WFS B Demod exchanged v1-161 with v3-S013

ISC-R1 (39-3) 71 CPS Timing Fanout exchanged v1-191 with v3-S135

Work was completed per WP 8255, balun status located at this link: E1900100.

** In the process of walking through the LVEA we found 4 more Baluns hidden among the TCS and SUS racks which need upgrading. We were able to upgarde one of these with this Tuesday, and will finish the remainder next maintenance day.

SUS-R3 (40-1) CPS HAM 71MHz exchanged v1-011 with v3-S113

This additional work was started per WP8261

marc.pirello@LIGO.ORG - 13:49, Tuesday 02 July 2019 (50349)

Link

M. Pirello, H. Radkins

The final three baluns were exchanged at the corner this morning for a total of 64 baluns replaced over 14 weeks.

TCS-R2 (41-1) 71Mhz CPS Timing exchanged v1-088 with v3-S144

TCS-R2 (41-2) N/A Empty signal with Balun exchanged v1-081 with v3-S001

TCS-R1 (41-6) TCS Signal from Mechanical Room exhcnaged v1-143 with v3-S045

All work finished per WP8261. This completes work done per FRS9794 and ECR-E1700404 at LHO.