ITMY R0 RT OSEM short - attempted fix at feedthru

After Kyle and Gerardo slow vented the corner, Gerardo and I pulled the 4.5" feed-thru for ITMY CABLE #7 and #8.  We then pulled both in-vacuum cables off the feed-thru in order to swap in a fresh copper gasket.  I re-tightened the back-shell screws and inspected cable #8 and then reseated it - it felt better going in that it came out so we had hope.  Running th spectra showed no improvement however.  We then tried to inspect the ~1ft of cable we were able to pull out through the feed-thru hole and wiggle things before reattaching it to the chamber.  Still no change in spectrum.  Boo.

We'll embark on pulling the door tomorrow.

(Sad face.)

Vented Vertex volume

Kyle, Gerardo 

Vent/Purge-air dew point measured -33C at start of vent.  It is expected to be a short duration vent 1 or 2 days with, at most, one BSC door removed.  

No ALS retro-reflaction from EY yet

Green beam was injected into TMSY and into EY, green centering on TMS QPD is working but no retro reflection from EY. I scanned TMSY PIT and YAW and observed green beam in ISCTEY but it would be much easier to just look at the beam in chamber. Will continue tomorrow.

EY was put back into laser safe.

CDS maintenance summary

PSL OPC update for 70W amp install:

Peter, Dave:

The OPC Beckhoff controls system in the diode room had a software update as part of the 70W amp install. This resulted in 25 additional channels. I re-generated H1EDCU_PSLOPC0.ini. I still need to regenerate the SDF monitor.req and restart/reconfigure the SDF.

h1iscey accidentally glitched:

CER activity glitched all models on h1iscey at 15:01 PST. I restarted these models at 15:23 after said activities completed.

Latest Slow Controls Code, Corner Station PCL3 and PLC4:

Daniel, Dave:

I installed Daniel's latest changes to h1ecatc1plc[3,4]. I used my new spiffy update_beckhoff_daq_target_sdf_configuration.py script to automate creating the INI, autoBurt.req and SDF monitor.req files. I restarted the associated SDF targets (h1sysecatc1plc[3,4]sdf), and accepted and monitored all the new channels.

Slow Controls EY PLC2 ring buffer error:

While verifying the h1ecatc1plc[3,4] changes, I found a channel access error to h1ecaty1plc2. Daniel found that this system failed Friday 16th Feb with a "cbHigh ring buffer full" error. No new channel access connections were being honored. Daniel restarted this IOC.

Cell phone alarms system reconfigured.

WP7208. Chandra, Dave:

I returned the alarm level of PT124B_TORR from 7.0e-09 to the nominal value of 5.0e-09 and closed this work permit.

DAQ FW0 E18 firmware upgrade

Greg, Dan, Dave:

Dan upgraded the firmware on the E18 raid array associated with h1fw0. This was a staggered update/reboot of the two controller cards. We tested that this could be done hot, with the frame writer still writing to this file system. This was a partial success, h1fw0 was indeed able to write frames over the upgrade, but LDAS had read errors. We will test this more next Tuesday when fw1's E18 is upgraded.

DMT test machine patched/updated

Greg patched h1dmt3, see his alog for details.

DAQ Restart

The DAQ was restarted to read the new H1EDCU_ECATC1PLC[3,4].ini and H1EDCU_PSLOPC0.ini files. The EDCU is now GREEN.

More files not executable in new 1.8 userapps

Ed found a few more files which did not have the executable bit set in the userapps repository (sys/h1/scripts/hepi-trends.py and psl/common/scripts/PSLweekly.py). I fixed the executable bit, but we are getting "leapsecond data expired errors" on hepi-trends.py, investigating this.

SHG refl/trans power

For a direct comparison to Maggie's alog37867 I attached a 2-day plot of SHG transmitted and reflected power (+ all other relevant channels) stopping right before a temporary TEC cable was removed:

CH1 = SHG crystal temperature, kept at 35.9 deg C where the green conversion was optimized.

CH2 = Red transmitted power through the SHG (16Hz channel)

CH3 = Mephisto laser power (locked to PSL for the most part)

CH4 = Temporary temperature channel (sensor installed after Feb 8th 00:00:00 UTC). A resistor was taped on to the table right next to the SHG housing (Calibration: 1638.4 counts per Celsius).

CH5 = Green reflected power (16Hz channel)

CH6 = TTFSS locking status.

So far we don't see the fluctuation that LLO is seeing. It's not the most stable looking power trend because we couldn't live without opening and disturbing the table for long (+ PSL was not in its best behavior that week). Once the SHG is locked and undisturbed for long enough time we can start characterizing it more seriously.

Flippers & fiber switch

The TwinCAT code and corresponding medm sreens have been completed for the motorized flippers and the remote fiber switch. There is now a flipper overview screen available. Final testing is needed for the fiber switch when it arrives.

The Electric Field Inside BSC10 (ETMY's) Chamber

S. Dwyer, J. Kissel, B. Weaver, R. Weiss

Sheila, Betsy, Rai, and myself measured the electric field inside BSC10 (ETMY's) chamber yesterday using an electric field meter developed by Rai (see T1700569). The experimental setup is show in the collection of pictures attached below.

We had three goals with the measurement:
(1) Characterize the broadband field.
(2) Confirm that the BSC-ISI's capacitive position sensors (CPS) don't create an excessive field inside the chamber (as was the case at MIT)
(3) Use the data to decide whether we need to vibrationally isolate the future in-chamber field sensor (see D1700365).

I attach several sets of plots comparing different measurement scenarios:
- In the lab, on the EE bench, immediately after calibration
- In chamber, with the sensor sensitive to the longitudinal direction (i.e. +/- Y global), exposed to the entire chamber that is sealed with a foil door.
- In chamber, in the longitudinal direction, shielded with a crude foil Faraday cage about 4 inches larger than the sensor in all directions.
- In chamber, in the transverse direction (i.e. +/- X global), exposed to the full chamber, sealed with foil
- In chamber, in the transverse direction, shielded with a foil smaller faraday cage, but the data is junk because I forget to reset the input range of the SR785.
The above data sets are shown in the set of plots at various levels of zoom in frequency. I also attach the raw ASCII data for your perusal if need be.

EDIT: The previous posting of this aLOG made all statements about and plots of electric field strength in V_{rms}.Hz^{-1/2}, but that was merely taking the raw voltage output of the SR785. The SI units for electric field strength is Volts.meter^{-1}. As Rai comments in LHO aLOG 40597, the calibration of this voltage into field strength is Volts / (Volt/m) = 2.1e-2. I've now calibrated the data both in the posted plots and text files and corrected all statements. Apologies for the confusion.

The data is collected from 1 Hz to 50 kHz, which completes goal (1). However, is not as satisfying as one could hope -- namely the crude shielding did not cleanly isolate / identify which spectral features were of the chamber or that of the sensor. But we think it's enough to accomplish goals (2) and (3).

Yet -- We can confirm that the BSC-ISI's CPS clock frequency at 24.82 kHz has an amplitude of only (at worst) 6e-5 (V.m^{-1})_{rms}.Hz^{-1/2} [with an 8 Hz bin width], which is not the dominant field strength inside the chamber.

At low frequency, given that we see many broad features (e.g. at ~25, ~55, ~80, ~130, ~191 Hz) that they change with location (lab vs. chamber) and direction (longitudinal vs transverse) we assume are acoustic. Rai suggests this is enough evidence to convince him that the future field meter needs to be vibrationally isolated, i.e. mounted onto Stage 2 of the BSC-ISI.

As Rai also suggests in LHO aLOG 40597, we should continue exploring the chamber with a few extra scenarios, namely attempting to turn off successive electronics, and/or try to mount the sensor on some sort of small isolation table.

A final note on the instrument -- it is sensitive to time-dependent magnetic fields (also present in the chamber) as well as static electric fields. Further the instrument and the cable readout are sensitive to acoustic vibration. During the measurement, all persons were quiet and still, but the end station itself is LOUD due to purge air and clean rooms. Further potential exploratory measurements besides turning things off would be to intentionally drive either a magnetic field or acoustic excitation near the instrument to further shake down the noise budget of the attached spectra. All exercises will be balanced against person power, time, and priority in conversation with all involved.

For now, we've left the sensor in BSC10 with it sealed with the foil door. We (Sheila, Betsy, and I) hope to get back to it on Wed/Thu/Fri.

PSL Weekly Report

Laser Status:
SysStat is good
Front End Power is -0.002755W (should be around 30 W)
HPO Output Power is -0.04998W
Front End Watch is RED
HPO Watch is RED

PMC:
It has been locked 0 days, 0 hr 0 minutes (should be days/weeks)
Reflected power = -0.0162Watts
Transmitted power = -0.02476Watts
PowerSum = -0.04096Watts.

FSS:
It has been locked for 0 days 0 hr and 0 min (should be days/weeks)
TPD[V] = 0.06647V (min 0.9V)

ISS:
The diffracted power is around 2.6% (should be 3-5%)
Last saturation event was 3 days 22 hours and 17 minutes ago (should be days/weeks)

Possible Issues:
Front End Power is Low
FSS TPD is low
Frontend flow warning, see SYSSTAT.adl
Epics alarm, see SYSSTAT.adl
Power meter flow error, see SYSSTAT.adl
LRA out of range, see SYSSTAT.adl
Check diode chiller
Check Xtal chiller

 

WHAM6 OPO/SQZ cables on C1 Adapter complete

Under WP 7348, last week, Corey and Nico help connect these cables to the C1 (top of chamber) conflat feedthrus.  The cables are now available for routing onto the table to the OPO & SQZ.  They are hanging on the SW side of the ISI.  They are labeled with ClassB metal tags and these should be removed after connecting.  They are labeled just as the In-Air side of the Feedthru is labeled, see attached photo and can be determined from D1300122 Sheet 8.  For example, C1-2C1 is the ZM1 Tip/Tilt BOSEMs.

The feedthru has been clamped metal to metal on the air side.  It has not been vacuum tested.  WP 7348 is closed.  WP 7341 (Septum Cover Install) remains open.

PSL Weekly Report - 10 Day Trends FAMIS #6188

PSL tripped over the weekend. Maik and Matt here to do 70W work. Trends look messy due to trips and chiller work. Too much to narrate. See you on the other side.

Shift Summary - Day

14:45 Chris to end stations for engine hoist moves

15:31Mark to EX to move engine hoist

16:00 Kyle at MY

16:30 Betsy into LVEA (biergarten) to have a look

16:31 Kyle back; Chris back and into LVEA

16:42 Cintas on site

16:42 Kyle to EY to recover moisture meter(s)

16:59 Sheila going into the optics lab

17:00 Chandra at EY with MCE

17:03 Chris and Mark to MY

17:07 Betsy out

17:08 Jeff B into cleaning area and possibly into LVEA

17:16 Kyle and Gerardo out to LVEA to begin CS venting process (WP 7538)

17:52 Norco on site with LN2 delivery to MY dewer

17:55 Hugh out to HAM6‌ for cleanup and looking for Viton

17:59 2nd Norco delivery on site heading to the other MY dewer

18:03 Fil heading into LVEA for cabling

Kyle and Gerardo out

18:09 Portable toilet service on site

18:10 Jenne, Tvo ad Evan to LVEA - taking posed photos

18:11 Jeff B out

18:11 Multiple WD tripped: BS, ITMX, ITMY(St1&2 all), HAMs 2,3,4,5

18:20 Corey out to Optics lab and then out to LVEA (ISCT1)

18:21 Jenne, Tvo and Evan back

18:55 reset all aforementioned WD trips

19:01 Jeff B to out-buildings to check dust monitors

19:05 all aforementioned WDs . re-tripped. (probably due to work being done with electronics)Jim reported that damping loops are still on.

19:48 Corey out

20:44 MCE out

21:01 Sheila and Terry out for lunch

13:23 Hugh out to HAM6 to torque bolts

21:29 Peter headed to the PSL enclosure to retrieve equipment

21:41 Gerardo to LVEA to retrieve humidty meters to bring to EX for tomorrow's vent

21:42 Betsy out to LVEAto start prep for the in-vac cable repair at BSC1

22:12 Hugh back from HAM6

22:13 Betsy back from BSC1

22:20 Jeff B

22:30 Hugh out to LVEA

22:42 Sheila back out to Optics lab

22:43 Betsy out to LVEA

22:45 Travis out to EY

22:48 TJ out of LVEA

22:54 Hugh out

23:04 TJ ad Alvaro out to optics lab

23:19 Gerardo back

23:21 Betsy and Gerardo out to LVEA/BSC1

Monthly Dust Monitor Vacuum Pump Checks (FAMIS #7522)

 Check all the dust monitor vacuum pumps. Adjust bypass, as necessary, for correct flow rate, All temps are within range. End-Y temp are a bit high due to the high room air temps from the main vacuum pumps.

DMT test box patched and rebooted

The h1dmt3 DMT box at LHO has been patched via yum update and rebooted. This is the DMT test box, and this update should have no impact on the control room.

EY is now LASER HAZARD

Rick, Travis

Some temporary Pcal work is happening. Transition back to SAFE when work is complete.

Shift Transition - Day

TITLE: 02/20 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 7mph Gusts, 5mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY:

ISI config is in Large EQ mode since Friday Feb 16th. I will leave it this way until Jim gets here. Work being done at both ends so BRS turned of seems like a good way to let it be fo now.

Actually the laser is off to facilitate work involving the 70W amplifier.

ISCT6 Detector calibration

Daniel, Sheila, Nutsinee

Nominal laser output power measured (with a PDA100A) as 18 mW through a 98% beam splitter (Rp 98%). Transimpedance=1500 Ohms, responsivity=.221A/W (variable gain setting on PDA100A set to 0dB).

Green output power measured (with a PDA100A) as 2 mW through 95% beam splitter (~100mW IR -> 40mW green). Transimpedance=1500 Ohms, responsivity=.313A/W (variable gain setting on PDA100A set to 0dB).

NewFocus 1611 detector to lock laser to PSL: Beat frequency signal measured with spectrum analyser ~ -14dBm at 155MHz as measured from the -1dB coupled output on the TTFSS pre-amp. Note there is a signal decrease by around 5dB with large (squeezing) laser frequency shifts (~500MHz or more) that seems to be due to beam pointing errors on the 1611 detector. However locking signal depends on phase and is largely insensitive to amplitude fluctuations so we should be ok. Responsivity=.75A/W, Transimpedance=-10k Ohm, gain setting 0, Voltage = -1.6V.

Power to 1611 detector: .30mW from PSL + .67mW from sqz laser -> .49mW on detector after 50/50 beam-splitter. MEDM screen reads .21mW ?? If the transimpedance is adjusted to -5k Ohm MEDM screen reads correct, but I suspect something is still odd about this. 

Fibre (PSL) power rejected = 1.3 uW measured with a PD1A detector (2 K impedance).

Fibre (PSL) power launched = 27 uW measured with a PD1A detector from a 10% beam splitter. Disabled gain selection setting (alog 40161) has been corrected. Note the beamsplitter was changed from 2% transmission in the original drawing (BS8) to 10% transmission.