Corner station FMCS chiller yard supply water temperature elevated, cell phone alarms bypassed

Bubba, Niko, Dave:

Starting around 8am PDT we received chiller cell phone alarms. Attached 24-hour trend shows the corner station supply water temperature was elevated. Bubba is investigating, in the mean time I have bypassed the cell phone alarms for this channel

Bypass will expire:

Sun Oct 13 08:23:38 PDT 2019

For channel(s):

    H0:VAC-LX_Y0_PT110_MOD1_PRESS_TORR

    H0:FMC-CS_CY_H2O_SUP_DEGF

Note that since a bypass is already in effect for PT110, I cannot issue a separate 6-hour bypass for the CS-CY-CHILLER. Therefore I will ensure that the FMCS channel is taken out of the bypass list when the issue has been resolved.

Ops Day Shift Transition

Ops Shift Transition: 10/03/2019, Day Shift 15:00 – 23:00 (08:00-16:00) - UTC (PT)

State of H1: Planned Engineering

Intent Bit: Commissioning

Weather: 0-5 mph wind

Primary 0.03 – 0.1Hz: 0.01 um/s

Secondary 0.1 – 0.3Hz: 0.1 um/s

Outgoing Operator: None

Quick Summary: Vacuum work underway, no other work started yet

NCAL Update -- Assembly of the NCAL mount

[Rick Savage, Jeff Kissel, Timesh Mistry]

Parts from RDL

Today (02 October 2019) we received the NCAL mount parts from RDL. Most of the parts have arrived thus we proceeded to assemble the mount in preparation for the remaining parts.
We are still missing part number D1900245.

Assembly of the NCAL Frame

I assembled the NCAL frame in the optics lab in preparation for a fitment and clearance check at the X end station. The full process/assembly instructions will be detailed in another document however I will summarise the process I underwent to assemble the mount. The parts referenced can be found from the NCAL document tree or using the parts names quoted below (or in the figure 1). All parts are hand tightened but not torqued to specifications at this point and all the fasteners used are given in the full assembly CAD drawing D1900145. The final assembly (without the NCAL) looks is given in figure 2.

1. Bolted D1900243-01 to D1900242 using 6x 1/4"-20 x 1" bolts and lock washers. Bolts are loose to allow for adjustment later.
2. Bolted  D1900243-02 to D1900242 using 6x 1/4"-20 x 1" bolts and lock washers. Bolts are loose to allow for adjustment later.
3. Adjusted the assembly thus far, using a straight edge and spirit level to ensure correct alignment. Tightened bolts in a star pattern using 7/16 spanner.
4. Bolted D1900247 onto D1900243-02 using 4x 1/4"-20 x 1" bolts and lock washer. Tightened bolts in a star pattern using 7/16 spanner.
5. Bolted D1900246 to D1900247 using 4x 1/4"-20 x 3/4" bolts and lock washers. Tightened bolts using 7/16 spanner.
6. Bolted D1900244 onto D1900247 using 3x 3/8"-16 x 1" bolts and lock washers. Tightened bolts using 9/16 spanner.
7. Bolted D1900241 onto D1900247 4x 1/4"-20 x 1" bolts and lock washers. Tightened bolts using 7/16 spanner.
8. Removed the NCAL base plate from the old mount and installed onto D1900244 using 3x 3/8"-16 x 1" bolts and lock washers. Tightened bolts using 9/16 spanner.
9. Since the NCAL is currently fully disassembled, I bolted the bottom frame + side frame onto the top of the NCAL mount structure to give an impression of the final height.
10. I attempted to install the Gibson Beam Clamps however, I found I had to use 1" bolts in Detail A of D1900145 since the 3/4" bolts are not long enough to securely hold the clamp.
11. I removed the beam clamps and rested the NCAL mount horizontally.

Pressing Dowel Pins

From LHO alog 52258, we had a few proposals to address the dowel pins on the top and bottom NCAL frames. We decided to partially press the dowel pins out (see figure 3). We used a press to push the dowel pins out and used washers to set the height of the dowel pins (see figure 4).The process in which we achieved this was:

1. Placed the NCAL frame in the press, with the pins facing up, ensuring that there is sufficient clearance on the reverse side for the dowel pin.
2. Placed the washers such that press will stop when it reaches the height of the two washers.
3. Used the lever to apply force on the dowel pin and continue to press until the washers stops were reached.
4. Released pressure on the pins and moved the unit to the next pin.
5. Repeated steps 1-4 for the remaining pins.

We found that it required more force than expected to press the pins out. Upon closer inspection of the outer surface of the pins, it is clear to see that is had seized into the NCAL frame. We suspect that the tolerances, for the holes that the pins are housed in, are too tight.

 

 

BSC8 PT-180 Gauge Upgrade

(Jeff J, Gerardo M)

Removed and replaced gauge for BCS8 PT-180, removed gauge BPG402-SE SN120.  Replace it with BCG450-SE SN216.  The old copper gasket was stuck for a bit, so I had to use the big tool to remove it.

The gauge is in fault mode right now so the readback is not valid, the new and the old gauge are very different, so a software update is needed in the Beckhoff world, to be done tomorrow morning.

 

HAM6 Vent work: SQZ fiber swapped

Nutsinee Fabrice Sheila Gerardo Daniel

After the vent, the fiber transmission recovered,  back up to 6 mW (from about 3mW before the vent). The unit was de-installed and will be shipped back to MIT for diagnostic. The new unit (SN6) was installed.

Power measurements with old fiber after the vent:

• Green launch: 18.5mW (power meter) (and 23.6mW on the green launch PD Epics readout, to be re-calibrated) 
• ISCT6 feedtrhough out: 13.2mW (power meter)
• Fiber in-vac output: 5.6mW (power meter)
• In-vac reflected cavity after dichroic: 5.3mW (power meter)
• SQTZ6 periscope downwards between mirrors: 5.3mW (power meter)

Power measurement with new fiber:

• Green launch: 19.5 mW (power meter) to cpl isct6 , (24.5mW green launch PD)
• ISCT6 feedthrough out: 14 mW (power meter) out of ISCT6 into in-air fiber
• Fiber in-air output: 13.3mW (power meter, into HAM6 feedthrough)
• Fiber in-vac output: 5.9 mW (power meter)

-- Fabrice not happy. 5m fiber swapped for a new one. --

Power measurement with new in-air fiber:

• New Fiber in-air output: 14.1mW (power meter, into HAM6 feedthrough)
• Fiber in-vac output: 9.1mW (power meter)

-- Fabrice is less diapointed (transmission was better on the test bench) --

We left the laser on for the night, at lower power (~12mW input)  to monitor the health of the power transmission.

HAM6 Report, Door Removal

(Kyle R, Tyler G, Rahul K, Chris S, Gerardo M)

Removed doors for HAM6, north door first, we had a small glitch with o-ring sticking in two places, with handy tool we were able to take care of those issues.

East door no issues to report.

Chamber left with purge air going.

XBM pumping down and YBM vented

{Bubba, Chris, Tyler, Chub, Jordan, Chandra}

Another good day of H2 decoupling work. We removed the expansion spool from BSC7 and installed the new door with no issues. Annulus pumped down quickly indicating no inner and outer o-ring leaks. We then blew down XBM volume (-37degC dew point) and proceeded to rough out volume. PT170 is currently reading 5 Torr. We will valve the QDP80 out for the night and resume pumping tomorrow morning.

Had time to vent YBM and remove expansion spool on BSC8. BSC8 flange is currently covered with C3 soft cover with a healthy purge air flow. The spool is connected to west crane and will be transferred to LVEA high bay area tomorrow morning when we're in full laser safe mode.

I moved the annulus pumping system from BSC7 to BSC8 in preparation for door installation tomorrow morning.

Verified PRG calculation

I verified the PRG calculation at LHO, motivated by Aidan's PRG comparison between LHO and LLO.
It's correct.  I've updated the medm screen to reflect what I found in the h1lsc and h1ascimc simulink models.  

I couldn't find in the alog where the PRG calculations were, so I'm reproducing them here.

PRG = Power in PRC/Input Power incident on back of PRM.

The input power on the back of PRM is calibrated into watts using IM4 Trans NSUM, fixed in alog 46590.  
If we trust this calibration, then Power on back of PRM/Requested Input Power = 88%

Power in PRC is calculated from POP A LF IN1.
POP A LF OUT is calibrated into microwatts via a "to_uW" filter module with gain = 4.015.  
POP A gets its power from transmission through PR2 and a 90:10 beamspliter (DCC D1000313).
PR2 has transmission of 228 ppm.

Power in PRC [W] = POP A LF IN1 [cts] * 4.015 [uW/cts] * 1e-6 [W/uW] / (T_PR2 * T_BS)
Power in PRC [W] = POP A LF IN1 [cts] * 0.175 [PRC W/cts]


The "calib" filter in the PR_GAIN filter module has gain 0.1745.  Assuming the calibrations of the PDs are correct, the PRG calculation is correct.

PRG = POP A LF IN1 [cts] * 0.175 [PRC W/cts] / IM4 TRANS NSUM [Input W]

Shift Summary - Day

TITLE: 10/02 Day Shift 15:00 – 23:00 (08:00-16:00), all times posted in UTC

STATE of H1: Planned Engineering

INCOMING OPERATOR: None

SHIFT SUMMARY: Finished BSC7 work, vented YBT manifold, PSL work ongoing, SQZ work ongoing.

LOG:

15:07 (08:07) Christina to LVEA

15:19 (08:19) Gerardo to LVEA -- assist door crew

15:39 (08:39) Jeff to LVEA -- check spool removal/HAM6 cleaning progress

16:15 (09:15) Betsy to LVEA -- check work progress

16:17 (09:17) Chris out of LVEA

16:22 (09:22) BSC7 door on, turbo pump warming up for BSC8 vent

16:58 (09:58) Travis to LVEA -- help with HAM6 work

17:09 (10:09) Sheila, Nutsinee to SQZT6 -- prep for laser hazard work

17:13 (10:13) TJ, Hugh to LVEA -- wait for door to come off, lock ISI

17:30 (10:30) TJ out of LVEA -- unable to lock HAM6 ISI

17:30 (10:30) Chris, Tyler, Gerardo out of LVEA -- HAM6 doors off, soft covers on

17:34 (10:34) TJ, Hugh to LVEA -- locking HAM6 ISI

17:53 (10:53) Chris to LVEA -- move spool to high bay

17:56 (10:56) Vanessa to EX

18:05 (11:05) Jason, Ed to LVEA -- check status of HAM5/6 laser enclosure

18:14 (11:14) TJ, Hugh out of LVEA -- HAM6 ISI locked

18:18 (11:18) Travis, Tyler, Chris out of LVEA

18:21 (11:21) Jenne, Brittany, Gavin, Dripta, Vlad to LVEA -- walkthrough

18:47 (11:47) SQZ laser being turned on (no elevated work)

18:52 (11:52) Jason to Optics Lab

19:00 (12:00) Jason out of LVEA

19:13 (12:13) Jenne, Brittany, Gavin, Dripta, Vlad out of LVEA

19:20 (12:20) Jeff to LVEA -- inform SQZ team of OPO SUS trip

VOPO locked (cause of trip)

19:48 (12:48) Karen to EY

19:49 (12:49) Sno-Valley here for chiller work

19:55 (12:55) Daniel, Nutsinee, Sheila, Fabrice, Dripta out of LVEA -- HAM5/6 area back to laser safe

20:40 (13:40) Chandra, Gerardo to LVEA -- break BSC8 bolts

20:47 (13:47) Karen leaving EY

20:54 (13:54) Jason, Georgia to PSL enclosure -- ALS bypass pick-off work

21:15 (14:15) Jamie, guests to LVEA

21:18 (14:18) Jeff to LVEA -- check on work progress

21:19 (14:19) Gerardo to LVEA -- replace PT-180 pressure gauge

21:40 (14:40) Betsy to LVEA -- help Gerardo

22:25 (15:25) Tyler out of LVEA

22:25 (15:25) SQZ crew taking HAM5/6 area to laser safe

22:34 (15:34) Jeff out of LVEA

22:35 (15:35) Timesh to Optics Lab

22:41 (15:41) Chandra, Jordan, Chub, Bubba out of LVEA for the day

22:47 (15:47) Rahul, Brittany, Chiara, Ethan to LVEA -- walkthrough

NCAL Update -- Inspection of Cleaned Parts and Parts Status

[Rick Savage, Jeff Kissel, Timesh Mistry]

This post is a delayed post from yesterday.

Inspection of Cleaned Parts

Since 10 Aug 2019, the Newtonian Calibrator (NCAL) had been fully disassembled and cleaned. The condition to which the parts were required to be cleaned to was not more than a Class B specification i.e. remove surface grime, particulates and residue. This has been completed by Chris Soike (many thanks) and the parts now moved into the optics lab for NCAL re-assembly.

We have not re-assembled the NCAL because we believe there to be some re-work of some of the parts as well as replacing some parts with more suitable components. Therefore, a summary of the todays' efforts are as follows:

• The bearing that had been removed from the NCAL shaft with a bearing puller, and as a result, from its housing, has been re-pressed back into its' housing. Before doing so, the inner surface of the housing that interfaces with the bearing has been cleaned using alcohol soaked wipes. In the process of cleaning the inner surface of the bearing housing, it was observed that there was a significant amount of dirt, potentially dried grease and glue, that coated the surface. Most of the surface contaminants could be wiped away with the alcohol wipes however, a screwdriver was employed for particularly stubborn dried on contaminants.
• The bearings themselves are not sealed bearings. There is a concern that over time, grease will leak out the and the bearing(s) could seize. The bearings installed do not appear to be the same ones called out in T1900357-v4 (current version at the time of this alog). We have ordered the parts as specified in the NCal Final Design Review and will replace the current bearing with the new parts.
• The metal dowel pins, that locate the top and bottom frame panels via intermediate side panels, protrude from the panels by 0.6". This make assebly and dis-assebmly very difficult since the toloerances are very small. This is considered rather excessive and the proposed idea is to either:
  • press them out and replace them with shorted dowel pins.
  • partially press them out. This could make dis-assembly more difficult in the future.
  • leave them as they are.
• The NCAL shaft has some remaining residue from the bearings, possibly baked on grease from heat cycles from the NCAL tungsten mass install and removal processes. This was removed by polishing the affected areas using a scotchbrite pad and alcohol wipes.
• The NCAL main rotor has a confirmed uniform thickness by using a 2" micrometer.
• The NCAL back plate may require a rework/design modification with the changes allowing easier access to install/remove the NCAL masses as well as perform any maintenance to the bored holes in the NCAL rotor. The suggested changes will be prepared in a separate document.

Parts from RDL

The NCAL mount was expected Oct 1 and has not arrived yet.
The NCAL drill fixture (jib) has already been tested [LHO alog 51605].

HAM6 ISI Locked on 3 of 4 Lockers

Hugh and I locked the B, C, and D lockers on the HAM6 ISI this morning. The A locker was inaccessible with only the North and East doors off. The attached screenshot shows the CPS residuals in nm and nrads.

CDS Overview MEDM, added new h1nds3 to DAQ block

I restarted the control room FOM to display the new CDS overview.

Weekly PSL Chiller Reservoir Top-Off

Added 100 mL to the crystal chiller. Filters look okay.

Ops Day Shift Transition

Ops Shift Transition: 10/02/2019, Day Shift 15:00 – 23:00 (08:00-16:00) - UTC (PT)

State of H1: Planned Engineering

Intent Bit: Commissioning

Weather: 0-5 mph wind

Primary 0.03 – 0.1Hz: 0.01 um/s

Secondary 0.1 – 0.3Hz: 0.1 um/s

Outgoing Operator: None

Quick Summary: Quiet morning, no early engineering work started yet as far as I know (maybe door crew in the LVEA).

All Personnel Out of VEAs for the Day; SQZ Laser is OFF

J. Kissel

I've confirmed that all activity has ceased in the LVEA (End-VEA activity was done early this afternoon), with all work planned completed for the day. 
[Last person out was Gerardo, whom got a jump start on replacing the PT-110 Vacuum Gauge on top of HAM6; aLOG pending.]

The SQZ laser has been keyed OFF by the 532 nm Fiber Measurement Team. High voltage for components in and around HAM6 remain ON.

HAM6 PT-110 Gauge Replaced

Took advantage of the quiet time at the end of the day to change the gauge at top of HAM6.  No problems to report during the installation of the new gauge.

Issue report per FRS ticket 10750, gauge still needs further testing to close such ticket.

Serial number of gauge removed 168.

Serial number of new gauge installed 217.

Logged into h0vaclx and set the units and trip points through the CoE parameters.

OPO scan

While trying to scan the higher order modes in the OPO the green trans camera wouldn't show any beam. The camera turned out to be misaigned. This was fixed with a short incursion into SQZT6.

The plot below shows a typical scan. The next 3 snapshots show a TEM00, TEM01 and donut mode resonances, respectively.

The donut mode always seems to have an amplitude around 12-14% of the carrier, whereas the TEM01 mode seems to be larger at lower PZT values. The highest I observed was 25% (near 0V at the PZT) and the lowest around 10% (near 100V PZT offset). In the center of the range the TEM01 seems to be around 15%-20%.

I tried to verify this by locking at different carrier PZT offsets. With 23.3mW at the fiber launch point, when locked at -7V offset the transmitted power was at 89%, When locked at 49V or 92V, the transmitted power was both at 96%. So, at the very low end we seem to loose about 7% in the build-up power. Even so the trend is the same as with the scan results, it doesn't agree very well numerically.

Lookig at the trends in the last plot, we can see that the launch power as well as the OPO reflected green power has started to increase around mid August, while the transmitted power was kept constant. The reflected power has increased by about 50%, whereas the launch power increased by about 25%. This looks like the fiber has started to degrade again.