TITLE: 10/26 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: Slow recovery from a big maintenance day. There were ISS struggles in the beginning, then ALS was pointed to nowhere, followed by many hours trying to figure out why the IMC was not locking. While Sheila and I had seemed to have tried everything, the MC just suddenly locked by itself. The FSS PZT Mon may have been oscillating for a while which could have caused much of the issue, but we are not 100% sure that this was the only problem for that time. Initial alignment also had PRM and SRM waaaaaay off, which meant adjusting other optics after adjusting those as well. Just finished an initial alignment and starting up the chain before I hand it off to Jeff.
LOG:

• 23:18 - Robert to LVEA for setup
• 00:21 - Rick and company back from EY
• 01:33 - Jason and Peter out of PSL

DarkhanT, Yuki Inoue (KAGRA), RickS (SudarshanK assisting with image analysis over the phone - until the phone died).

Today, we went to Yend to investigate the apparent clipping that EvanG had discovered (see entry 30827).

We found that both beams were off centered on the aperture of the Rx module integrating sphere, with the Outer (lower) beam clipping on the aperture (see attached image).  Blocking one beam and then the other revealed that the increased noise in the Rx power sensor spectrum was all due to the clipping of the Outer beam.

Camera images revealed that the beams had moved on the ETM as well (exonerating movement of the ETM as the cause of the movement on the Rx side).

Analyzing Pcal camera images we found the beam position offsets from the optimal locations were (x, y): Upper (-1.5, 1.8); Lower (-6.9, -2.5) (millimeters) Usual x,y convention: positive x, right; positive y, up.

Not knowing what had moved, we used the output steering mirrors in the Tx module to center the beams on the Rx intetrating sphere aperture (see attached photo).

After moving the beams, analysis of camera images (see attached)  gave the following beam locations (x, y): Upper (-1.4, -0.9); Lower (-1.3, -1.4) (millimeters). 

These are within our 2 mm tolerance.

We installed apertures at the output of the Tx module and at the input (just upstream of the steering mirrors) in the Rx module.

We will repeat the Yend calibration using the Working Standard as soon as possible.

Keith found the source of our full disk. When md5 checksums where added to the frame directory the NDS server began logging error messages for each non .gwf file that was found.  This ended up contributing to huge log files +90GB.

We have updated the nds process to quiet these messages as this is no longer an error condition.

See work permit 6280 and bug 1054.

Cyropump #4 was generating alarms today, both before and after Dewar fill. After trending signals, it appears the LLCV and exhaust noise has been growing over time. Pump fill level and LLCV setting stabilized after I opened the bypass exhaust valve. Wondering if the check valve is faulty. Will test tomorrow. I have removed and reinstalled it a couple times in the last month with TC testing.

Kyle, Chandra

We ran all QDP80 roughing pumps on site today for maintenance and for refresher (WP 6269); checked for gross leaks in foreline/turbo volumes. Found one at MX.

EY
as found pressure
foreline = 14 Torr
turbo = 0.58 Torr
after rough pump down and following valve isolation
foreline = 0.040 Torr
turbo = 0.036 Torr

MY
as found pressure
foreline = 2.3 Torr
turbo = 0.60 Torr
after rough pump down and following valve isolation
foreline = 0.013 Torr
turbo = 0.022 Torr

LVEA - vertex
as found pressure
foreline = 2.2 Torr
turbo = 0.67 Torr
after rough pump down and following valve isolation
foreline = 0.017 Torr
turbo = 0.022 Torr

LVEA - Xbeam manifold
as found pressure
foreline = 12 Torr
turbo = 0.63 Torr
after rough pump down and following valve isolation
foreline = 0.021 Torr
turbo = 0.039 Torr

LVEA - diagonal
as found pressure
foreline = 5.4 Torr
turbo = 0.54 Torr
after rough pump down and following valve isolation
foreline = 0.026 Torr
turbo = 0.039 Torr

LVEA - Ybeam manifold
as found pressure
foreline = 5.4 Torr
turbo = 0.48 Torr
after rough pump down and following valve isolation
foreline = 0.025 Torr
turbo = 0.034 Torr

MX
as found pressure
foreline = 780 Torr
turbo = 1.0 Torr
after rough pump down and following valve isolation
foreline = leaking
turbo = 0.084 Torr

EX
as found pressure
foreline = 6.6 Torr
turbo = 0.43 Torr
after rough pump down and following valve isolation
foreline = 0.017 Torr
turbo = 0.026 Torr


The leak in the X-mid fore line is between the Turbo Header isolation 
valve and the Turbo fore line Safety Valve. Removed and examined the 
NW seals but nothing obvious.

We verified each QDP80 shuts down with the absence of N2 purge seal gas supply except the Y-end QDP80 which did not shut down.

Y-mid pump turned off due to overheating because cooling water was not valved in initially. It leaked a small puddle of coolant and ran OK upon cooling.

We pumped down the purge air line in LVEA unintentionally.

FRS 4559
WP 6247

EX:

1. Placed HWS camera on seperate power supply. The power supply is underneath the ISCTEX table.
2. Finished cabling for RGA at EX.

LVEA:

1. Placed HWS cameras (X & Y) on seperate power supplies.
2. Terminated network cable for RGA in LVEA. Network cable is pulled to SUS-R3. Connection to switch needs to be made in CER.
2. Placed power distribution boxes (24V regulated down to 12V)  for the ITM spool cameras, for both X and Y arms.
2. Placed junction box and landed power cables on top of H1:SUS-R5. This is part of the ongoing work for the 24V digital power distribution.
3. Started work on junction box on top of H1:SUS-R6.

The software for the HWS cameras needs to be restarted.

F. Clara, E. Merilh

WP 6276

[Changed the power level on PDA]

I went into the PSL today and changed the ND filter that was screwed on the PDA photodetector module (30415) in order to change the power level of the photo diode. Before the change the PDA DC singal read a relatively small value of 2.2 V. After the change, the DC signal became 3.8 V which is close to what PDB says 3.9 V. Indeed, the voltage readouts for the two diodes shown in the medm became close to each other (~ 4.5V). The new ND filter is actually a stuck of 0.2 and 0.5 abrorptice ND filters. It was an ND1 before.

[New setting for ISS inner loop]

The gain slider now should be 18 dB (which used to be 30 dB, 30415). This gain gives us a UGF of 54 kHz. This means that the open loop transfer function is almost identical to the one with PDB used as the in-loop sensor (29942) as expected. In fact, we can now switch the sensor between PDA and PDB without changing the reference offset or gain while keeping the loop closed. Though this typically changes the diffraction power by a few %. The new gain is now accepted in SDF.

The attached is a plot of the measured open loop transfer function with PDA. Also the raw data is attached. Also, I attach a noise spectrum seen at one of the analog output for measuring the transfer function.

M. Pirello, A. Ramiez,  E Castrellon

Work Permit 6271

Per ECR E1600292 we applied the VCO capacitor mod to all 5 VCO's in the corner station and one at each end station.  This process includes replacing the 10nF capacitors on C79 and C80 with 2uF capacitors, and checking the voltage rails to verify elimination of the 420kHz oscillations.

Corner Station Units:

S1200563, S1200559, S1200560, S1200564, S1200558

End X:

S1200561

End Y:

S1200566

Notes:

End X, there was a very inconvient clean room pole directly in the path of extraction for the VCO from the rack.  We had to relocate 2 chassis to angle the VCO enough for removal.  All chassis were put back in their original positions before leaving.

End Y, this VCO required more capacitance to remove all of the 420kHz noise on the -24V Rail, with the addition of a 2nd 2uF capacitor, the noise was eliminated.

We checked the cleanliness of the double paned port between the PSL and HAM1. The photo shows a smudge on the outside surface that extends into the center of the port. We think that a cleaning would help. There is dust on the inner pane, but I think the smudge on the outside is the most dangerous.

Robert, Cheryl, Gerardo

TITLE: 10/25 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  Entire shift was dedicated to maintenance activities.
LOG:

15:17 Kissel taking SUSes down for model work

15:25 Joe D to mids and ends for first aid kit maintenance

15:26 Fil, Ed to EX HWS camera work

15:30 Marc, Richard to LVEA

15:33 Cristina and Karen to ends

15:40 Gerardo to EY

15:52 Fan lubing complete

15:54 Kyle to EX

15:55 Cintas on site

15:56 Chandra to LVEA

15:59 Marc and Alfredo VCO work

16:04 Hugh to LVEA

16:07 Gerardo to EX

16:08 Pcal team to EY

16:13 Bubba and Richard to LVEA

16:20 Keita, Evan to EX then EY for timing measurements

16:26 Richard out

16:30 Betsy to LVEA

16:32 Robert to LVEA

16:42 Jason resetting Purple People Noise Eater

16:45 Joe D done

17:00 Cristina back, going to LVEA

17:01 Ed, Fil to back, going to LVEA

17:05 Hugh done

17:12 Corey to LVEA 3IFO inventory

17:17 Karen to LVEA

17:20 DAQ restart

17:46 Corey out

17:49 Betsy out

17:58 Chandra working on vacuum roughing pumps

18:11 Norco on site

18:17 Robert to EY

18:30 Kiwamu to PSL

18:41 Richard to EY for RGA work

18:46 Evan G and Keita to EX, Marc done

18:56 Hugh done

19:06 Jason and Peter to PSL picomotor work

19:26 Evan G and Keita done

19:36 Fil to beer garden for RGA work

19:57 Marc, Liz to EX, then EY VCO work

20:18 Peter, Jason out

20:28 Dave to both ends

20:49 Kyle to EX

20:51 Corey to both mids

20:54 Hugh to LVEA

21:02 Chandra to MY

21:04 Dave out, Kiwamu out, Hugh out

21:17 KIwamu to LVEA OLTF of ISS

21:25 Jason, Peter to PSL, Sheila to PSL racks

22:07 Kiwamu, Kyle done

22:29 Fil, Ed done

22:40 Sheila, Ed to look at TCSX laser

22:48 Marc, Liz done

I added 500ml of water to TCSY chiller.

[Stuart A, Jeff K]

While debugging and commissioning the LLO ITM LV ESD monitoring I noticed that there is an ADC channel discrepancy in the h1susauxb123 model (see below, just ITMX shown). It is noted that there is an unorthodox convention for the order of the LV ESD monitor channels (as given in D1500464), which is already taken account of in the library LVESD_STAGE_MONITOR_MASTER part (see below). 

However, in h1susauxb123, the ordering for the ESD quadrants assigned to ADC_7 mistakenly switch the order n.b. this occurs for both ITMX and ITMY LV ESD monitoring.

Therefore, I've made the correction to the l1susauxb123 model (see below, just ITMX shown), and LLO shall rebuild, reinstall and restart the model at the next opportunity.

The power supplies for the h1isce[x,y] timing slave cards were inadvertently glitched this morning during maintence when diagnostics equipement was being plugged in. We have labeled these power outlets to prevent future occurance. Models were restarted with no problems.

as part of the cleanup following the filling of /opt/rtcds on Sunday, this afternoon at 12:50 PDT I started a 'zpool scrub rtopt' file system cleanup on h1fs0. At the time of this alog the system is predicting the will complete in 8 hours (11pm PDT).

If anyone notices any slow down of EPICS data from front ends, please contact me.

Pumps will continue to run at X-end RGA for a few more days. 

Closed cal-gas isolation valves.  Manually reducing variac's by ~10% every 2 hrs. today.

Bake Summary: 
Approximately 90% of surface area soaked between 180C < temperature < 210C for 96 hrs..  Additional 72 hrs. manual incremental ramp up.  ~10% surface area tapered down to ~90C at turbo inlet line-of-site during soak period.  

. 

We recorded AI output of PCAL injection as well as PCAL_DAC_FILT thing together with witness GPS 1pps using Tektronics MSO4043 (1 sec with 1Msample per channel, and 2 sec with 1Msample per channel).

We also recorded the digital output of the PCAL injection as well as digital input of the PCAL_DAC_FILT thing.

Evan will look at the timing comparator data.

These will be analyzed in the near future for further timing sanity check.

TITLE: 10/25 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Aquisition
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: Locking DRMI/PRMI was not easy, it required large adjustments and waiting a good amount of time. useism is also getting pretty high so I tried the WINDY_USEISM state, brought it back to WINDY because I couldnt tell which was better. Aside form that the commissioners are working.