40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 145 of 341  Not logged in ELOG logo
ID Date Author Type Categoryup Subject
  15174   Wed Jan 29 12:29:33 2020 shrutiUpdateGeneraldelay line frequency discriminator for PM

 Today I began working on a TF measurement based on the delay line frequency discriminator setup in elog 4254 using a single mixer (without the 'I' and 'Q' readout).

For this, I re-organised the setup for the PLL measurement of the transfer function (elog 15148), increasing the HEPA for the initial changes while the PSL door was open, and then reverting it back to ~30%:

  • I removed the 20dB coupler and connected the splitter directly after the amplifer to split the beat note signal into two coaxial cables one of which was ~1.5m longer than the other
  • The recombined signals were combined in a mixer outside the PSL enclosure. I also replaced the 1.9 MHz LPF with a 5 MHz LPF.
  • I used an SR 560 to amplify the signal after the LPF.

With the above setup the power that was seen at each channel of the delay line was <1dBm, which is not ideal for the any of the available mixers.

After the group meeting, I changed the amplifer to ZHL-3A (that is near the beat mouth) instead of a ZFL-500HLN because it had a higher gain (~28dB as opposed to ~19dB of the latter). The power seen at each of the delay line channels is over 5.5 dBm. This is consistent with the estimation 0 dBm beat -> -20 dBm after 20dB coupler -> 8 dBm after amplifier -> 5 dBm after splitter with insertion loss of 3 dB.

Is this sufficient enough for the mixer to work? In Attachment 1: A shows the mixer output (point B in Attachment 2) when the IMC is locked, in B the IMC is unlocked at the middle of the spectrum, and each of the dips show the DC voltage being sent to the PSL temperature servo being decreased by 0.01 V.

Gautam pointed me to the location of a few other RF amplifiers (ZHL-32A+, ZHL-1A) which don't possess a higher gain but can be used without disrupting the ALS related work (I was told).

For shorter duration changes that I made later, I opened and closed the PSL enclosure doors without changing the HEPA.

Attachment 2 shows the current setup as is, but I might add a PSL servo tomorrow to stabilise its frequency corresponding to a null mixer output without driving anything else.

Attachment 1: 20200128.png
20200128.png
Attachment 2: IMG_BB01C068495A-1.jpeg
IMG_BB01C068495A-1.jpeg
  15177   Thu Jan 30 15:24:10 2020 ?UpdateGeneraldelay line frequency discriminator for PM

yes, its fine to use this with a level 3 or level 7 mixer; let's see some PM transfer functions !

Quote:

Is this sufficient enough for the mixer to work?

  15180   Thu Jan 30 22:02:42 2020 shrutiUpdateGeneraldelay line frequency discriminator for PM

I could not find any level 3 mixers, but by adjusting the beat frequency the power in each of the delay line channels rose to almost 6.5 dBm.

In short: Delay line seems to work

Things I did earlier today:

  1. Played with the slow servo on the FSS screen, but then reset the parameters to what was there before (Later found out that this was to lock the PSL freq to the IMC when the IMC power is significant.)
  2. Connected the AG 4395A to the X PZT
  3. Closed the PSL shutter

Transfer function measurement: (Refer Attachment 1)

Everything about the setup remained as I had left it earlier: described in elog 15174

except

  • SR560 gain set to 10, DC coupled
  • DC block at channel A of Agilent (The measurement was A/R)

I did not use a slow servo, but took individual sweeps adjusting the PSL temperature each time to bring the error voltage between +/-25 mV. The beat frequency was over 100 MHz.

For the plot posted in Attachment 1, the measurement paramters are the following. Will do further measurements/analysis tomorrow.

# AG4395A Measurement - Timestamp: Jan 30 2020 - 21:58:00
# Parameter File: TFAG4395Atemplate.yml
#---------- Measurement Parameters ------------
# Start Frequency (Hz): 50000.0, 50000.0
# Stop Frequency (Hz): 1000000.0, 1000000.0
# Frequency Points: 801, 801
# Measurement Format: LOGM, PHAS
# Measuremed Input: AR, AR
#---------- Analyzer Settings ----------
# Number of Averages: 1
# Auto Bandwidth: Off, Off
# IF Bandwidth: 1000.0, 1000.0
# Input Attenuators (R,A,B): 0dB 0dB 0dB 
# Excitation amplitude = -20.0dBm

Quote:

yes, its fine to use this with a level 3 or level 7 mixer; let's see some PM transfer functions !

Quote:

Is this sufficient enough for the mixer to work?

Attachment 1: Figure_2.png
Figure_2.png
  15182   Fri Jan 31 16:57:09 2020 gautamUpdateGeneralMetal PMC parts

Jon brought over a box of parts for constructing the metal PMCs. I have stored it along the Y-arm, on top of the green optics cabinet.

I didn't do an exhaustive inventory check, but the following are the rough contents of the box:

  • 41 deg AoI flat mirrors, R=99% @ 1064nm --- 11 pcs
  • 6.8 deg AoI curved mirrors --- 5 pcs
  • PZTs --- 3pcs
  • Metal PMC body --- 2 pcs
  • "Baked PZT endcaps" --- 3 pcs
  • Ball bearings, clamps, misc hardware

I didn't inspect the optics but since we have so many, I am hoping we can find 3 good quality ones for one cavity at least. We should check that the geometry is suitable for our RF sideband frequencies.  

  15193   Thu Feb 6 16:14:44 2020 ranaUpdateGeneraloffice area temperature

I changed the office area thermostate near Steve's desk from 68F to 73F today. Please do not change it.

If anyone from facilities comes to adjust something, please put the details in the elog on the same day so that we can know to undo that change rather than chase down other drifts in the system.

  15196   Fri Feb 7 02:41:28 2020 KojiUpdateGeneraloffice area temperature

Not sure what's wrong, but the workstation desk is freezing cold again and the room temp is 18degC (64degF).

  15197   Fri Feb 7 09:45:03 2020 shrutiUpdateGeneralAM at X end

I took a few AM TF measurements at the X end for which I:

  • Misaligned the ITMX (then re-aligned it)
  • Opened the X green shutter during the measurements and closed it at the end
  • Moved the Agilent from the PSL area to the X end, the delay line and mixer still remains near the PSL area (will move it soon)
  • Took a bunch of TFs

I will post the data soon.

  15198   Fri Feb 7 12:58:25 2020 YehonathanUpdateGeneralMetal PMC parts

I took the metal PMC box and examined its content and find the following items:

Name Quantity Picture (Attachment #)
Metal PMC body (PMC1) 1 1-3
Metal PMC body with two mounted 41 deg mirrors (PMC2) 1 4-6
"Baked PZT Caps" 3 7
PZT Caps 2 8
Flat mirror mounts 2 9
Bar clamps 4 10
Clamp studs 8 10
PZTs 4 11
ORings INF 12
Ball bearings INF 13
6.8 deg AoI curved mirrors (r=-1000mm) 6 14
41 deg AoI flat mirrors, R=99% @ 1064nm (1 Damaged) 11 15

There seem to be enough parts to build 2 PMCs + spares.

I find several problems in the metal PMCs:

PMC1 has a broken screw in one of its flat mirror mounts (Attachment 16). We need to get it out in the machine shop.

PMC2 one of the flat mirrors has a scratch on the AR coating and its ORing is failing (Attachment 17). Mirror and ORing need to be replaced.

I measure the physical dimensions of the PMC with the help of https://dcc.ligo.org/LIGO-E1400332. The roundtrip is found to be 24cm which gives an FSR of 1.25GHz.

I use Evan Hall's Python script for calculating the mode spectrum as a function of the cavity length of the metal PMC and overlay the RF sidebands (Green dashed lines) on it (Attachment 18) to check for any HOM coincidence. The width of the lines is the mode splitting due to the cavity astigmatism.

It seems like the only issue might come from a 10th order modes (green ribbon) which are hopefully small enough in reality.

Attachment 1: PMC1Side.jpg
PMC1Side.jpg
Attachment 2: PMC1Front.jpg
PMC1Front.jpg
Attachment 3: PMC1Back.jpg
PMC1Back.jpg
Attachment 4: PMC2Side.jpg
PMC2Side.jpg
Attachment 5: PMC2Back.jpg
PMC2Back.jpg
Attachment 6: PMC2Front.jpg
PMC2Front.jpg
Attachment 7: 20200207_123118.jpg
20200207_123118.jpg
Attachment 8: 20200207_123055.jpg
20200207_123055.jpg
Attachment 9: 20200207_122448.jpg
20200207_122448.jpg
Attachment 10: 20200207_122400.jpg
20200207_122400.jpg
Attachment 11: 20200207_122040.jpg
20200207_122040.jpg
Attachment 12: 20200207_122227.jpg
20200207_122227.jpg
Attachment 13: 20200207_122149.jpg
20200207_122149.jpg
Attachment 14: 20200207_123328.jpg
20200207_123328.jpg
Attachment 15: 20200207_123405_HDR.jpg
20200207_123405_HDR.jpg
Attachment 16: PMC1Screw.jpg
PMC1Screw.jpg
Attachment 17: PMC2BadMirror.jpg
PMC2BadMirror.jpg
Attachment 18: homVersusLength.pdf
homVersusLength.pdf
  15201   Mon Feb 10 09:40:54 2020 Larry WallaceSummaryGeneralSolidWorks Computer Upgrade and Printer repair

On February 5, 2020, the Dell engineering workstation located in the 40M lab, was replaced with a newer Engineering workstation, per a request from Koji . The new workstation should perform a good deal better over the older unit. It has more cores, more memory and a better video card. Since this unit is being used by the 40M group, the Comsol s/w pkg. was also installed on the unit.

During the computer swap, Koji had a problem with a print job and it was discovered the bottom tray of the HP5550 printer was broken. The broken tray was replaced from another unit that was being disposed of.

  15203   Mon Feb 10 15:04:42 2020 JordanUpdateGeneralHDMI Routing for new tv

Ran HDMI to the new tv mounted on the north wall of control room.

  15222   Mon Feb 24 08:36:32 2020 ChubUpdateGeneralHVAC repair

The HVAC people replaced a valve and repaired the pneumatic plumbing on the roof air handler.  Temperature has been stable during the day since Thursday.  If anyone is in the control room during the evening, please make a note of the temperature.

Chub

  15270   Thu Mar 12 11:10:49 2020 YehonathanUpdateGeneralPMC got unlcoked

Came this morning to find the PMC was unlocked since 6AM. Laser is still on, but PMC REFL PD DC shows dead white constant 0V on PMC screen. All the controls on the PMC screen show constant 0V actually except for the PMC_ERR_OUTPUT which is a fast channel.

 

Is PSL Acromag already failing?

 

I restarted the IOC but it didn't help.

I am now rebooting c1psl... That seemed to help. PMC screen seem to be working again. I am able to lock the PMC now.

IMC was locking easily once some switches on the MC servo screen were put to normal states.

TTs were grossly misaligned. Onces they where aligned, arm cavities were locking easily. Dither align for the X arm is very slow though...

  15271   Thu Mar 12 12:44:34 2020 gautamUpdateGeneralPMC got unlcoked

Of course the reboot wiped any logs we could have used for clues as to what happened. Next time it'll be good to preserve this info. I suspect the local subnet went down.

P.S. for some reason the system logs are priveleged now - I ran sudo sysctl kernel.dmesg_restrict=0 on c1psl to make it readable by any user. This change won't persist on reboot.

Quote:

I restarted the IOC but it didn't help.

I am now rebooting c1psl... That seemed to help. PMC screen seem to be working again. I am able to lock the PMC now.

  15286   Mon Mar 30 19:02:49 2020 ranaUpdateGeneraldonated cleanroom supplies to Hospitals

Yesterday evening I took nearly all of the masks, gloves, gowns, alcohol wipes, hats, and shoe covers. These were the ones in the cleanroom cabinets at the east end of the Y-arm, as well as the many boxes under the yarm near those cabinets.

This photo album shows the stuff, plus some other random photos I took around the same time (6-7 PM) of the state of parts of the lab.

  15301   Mon Apr 13 15:28:07 2020 KojiUpdateGeneralPower Event and recovery

[Larry (on site), Koji & Gautam (remote)]

Network recovery (Larry/KA)

  • Asked Larry to get into the lab. 

  • 14:30 Larry went to the lab office area. He restarted (power cycled) the edge-switch (on the rack next to the printer). This recovered the ssh-access to nodus. 

  • Also Larry turned on the CAD WS. Koji confirmed the remote access to the CAD WS.

Nodus recovery (KA)

  • Apr 12, 22:43 nodus was restarted.

  • Apache (dokuwiki, svn, etc) recovered along with the systemctl command on wiki

  • ELOG recovered by running the script

Control Machines / RT FE / Acromag server Status

  • Judging by uptime, basically only the machines that are on UPS (all control room workstations + chiara) survived the power outage. All RT FEs are down. Apart from c1susaux, the acromag servers are back up (but the modbus processes have NOT been restarted yet). Vacuum machine is not visible on the network (could just be a networking issue and the local subnet to valves/pumps is connected, but no way to tell remotely).

  • KA imagines that FB took some finite time to come up. However, the RT machines required FB to download the OS. That made the RTs down. If so, what we need is to power cycle them.

  • Acromag: unknown state

The power was lost at Apr 12 22:39:42, according to the vacuum pressure log. The power loss was for a few min.

  15303   Tue Apr 14 23:50:06 2020 KojiUpdateGeneral40m power glitch recovery

[Koji / Gautam (Remote)]

Lab status

  • Gray Panel: The lab AC was off. Turned on all three (N/S, CTRL RM, E/W)
  • The control room AC was running.

Work stations

  • Control Room: All the control machines were running. We knew that nodus/chiara/fb were running
  • 1X6/7:
    • JETSTOR was making beeping sound. “Power #1 failed””power #2 failed”
    • Optimus & megatron were off -> turned on -> up and running now
  • 1X1/2:
    • Power cycled the netgear at the top of the IOO rack (maybe not necessary)
    • Turned on c1ioo -> up and running now
  • 1X4/5: Rebooted c1sus / c1lsc -> up and running now
  • 1X9: Rebooted c1iscex -> up and running now
  • 1Y4: Rebooted c1iscex -> up and running now

Vacuum status

  • Looked like everything was running as if it did not see the power glitch
  • TP1 normal: Set speed 33.6k rpm / Actual speed 33.6k rpm 
  • TP2 normal: 66k rpm / PTP2 16.0 mtorr
  • TP3 normal: 31k rpm / PTP3 45.4mtorr
  • P1 LOW / P2 1.7mtorr / CC2 1.1e-6 / P3 7.6e-2 / P4 LO
  • Annuli: 2.7~3torr
  • CC1 9.6e-6 / SUPER BEE 0.9mtorr

C1VAC recovery

  • c1vac was alive, but was isolated from the martian network
  • Checked the network I/F status with /sbin/ifconfig -a
    • eth0 had no IP
    • eth1 had the vac subnet IP (192.168.114.9)
  • Ran sudo /sbin/ifdown eth0 then  sudo /sbin/ifup eth0
  • The I/F eth0 started running and c1vac became visible from martian
  • Later checked the vacuum screen: The pressure values and valve statuses looked normal.
    The interlock state was “running”. The system state was “unrecognized”.

End RTS recovery 

  • The end slow machines (auxex and auxey) were already running
  • Restarting end RT models:
    • c1iscey -> rtcds start --all
    • c1iscex -> rtcds start --all
  • Confirmed that the models can dump the SUSs

Vertex RTS recovery

  • We wanted to use the reboot script. (/opt/rtcds/caltech/c1/scripts/cds/rebootC1LSC.sh)
  • c1susaux​​
    • To be safe, we wanted to bring c1susaux first.
    • c1susaux does not make the network I/Fs up automatically upon reboot.
      -> Connect an LCD display / keyboard / mouse to c1susaux
      -> Ran sudo /sbin/ifup eth0 and sudo /sbin/ifup eth1
    • Now c1susaux is visible from martian.
    • Login c1susaux and ran:  
      sudo systemctl start modbusIOC.service 
      -> c1susaux epics is up and running now
    • ...Meanwhile c1susaux lost its eth1 somehow. This made the slow values of 8 vertex sus all zero
      -> Ran sudo /sbin/ifdown eth1 and sudo /sbin/ifup eth1 again on c1susaux ->  this resolved the issue
  • c1psl
    • Login c1psl and ran:  
      sudo systemctl start modbusIOC.service 
      -> c1psl epics is up and running now
  • Prepared for the rebooting script
    • Ran /opt/rtcds/caltech/c1/scripts/cds/rebootC1LSC.sh
    • Rebooting was done successfully. All the suspensions looked free and healthy.
    • Burtrestored c1susaux (used Apr 12 21:19 snapshot)

Hardware

  • PSL laser / Xend AUX laser / Yend AUX laser were off -> turned on
  • The PMC was immediately automatically locked.
  • The main marconi was off -> forgot to turn on
  • The end temp controllers for the SHG crystals were on but not enabled -> now enabled

RTS recovery ~ part 2

  • FB: FB status of all the RTS models were still red
  • Timing: c1x01/2/3/5 were 1 sec behind of FB and c1x04 was 2 sec behind
  • -> Remedy:  https://nodus.ligo.caltech.edu:8081/40m/14349
    • Software rebooting of FB
    • Manually start the open-mx and mx services using
    • sudo systemctl start open-mx.service 
    • sudo systemctl start mx.service
    • Check that the system time returned by gpstime matches the gpstime reported by internet sources. e.g. http://leapsecond.com/java/gpsclock.htm
    • Manually start the daqd processes using
      sudo systemctl start daqd_*
  • This made all the FB(FE) indicators green!
  • Ran the reboot script again -> All green!

IMC recovery

  • The IMC status was checked
  • No autolocker, but it could be manually locked. i.e. MC1/2/3 were not so much misalignment
  • Autolocker/Slow FSS recovery along with https://nodus.ligo.caltech.edu:8081/40m/15121
    • sudo systemctl start MCautolocker.service
    • sudo systemctl start FSSSlow.service
  • Both of them failed to run
  • Note by Gautam: The problem with the systemctl commands failing was that the NFS mount points weren’t mounted. Which in turn was because of the familiar /etc/resolv.conf problem. I added chiara to the namespace in this file, and then manually mounted the NFS mount points. This fixed the problem.
    Now the IMC is locked and the autolocker is left running.

Burt restore

  • Used Apr 12 21:19 snapshot
  • c1psl
  • c1alsepics/c1assepics/c1asxepics/c1asyepics
  • c1aux/c1auxex/c1auxey/
  • c1iscaux/c1susaux
  • This made REFL and AS beams back to the CCDs. As has small fringes.
  • Y arm has small IR flashes as well as green flashes.

JETSTOR recovery

  • JETSTOR was beeping. 
  • Shutdown megatron
  • Followed the instruction https://nodus.ligo.caltech.edu:8081/40m/13107
  • This stopped beeping. Waiting for JETSTOR to come up -> In a minute, JETSTOR display became normal and all disks showed green.
  • Bring megatron back up again

N2 bottle

  • The left N2 bottle was empty. The right one had 1500PSI.
  • Replaced the left bottle with the spare one in the room.
  • Now the left one 2680PSI and the right one 1400PSI.

Closing

  • Closed PSL/AUX laser shutters
  • Turned off the lights in the lab, CTRL room, and the office.

Remaining Issues

  • [done] MCAutoLocker / FSSSlow scripts are not running
  • The PRM alignment slider has no effect (although the PRM is aligned…) -> SLOW DAQ frozen???
  • JETSTOR is not mounted on megatron [gautam mounted Jetstor on megatron on 4/18 at 2pm]
  15308   Mon Apr 20 17:49:58 2020 gautamUpdateGeneralSome housekeeping
  • Empty N2 replaced. 
  • Logged back into zita and started the StripTool traces (even though we keep the TV off nowadays).
  • c1susaux acro-crate power cycled to re-enable PRM suspension control (all other vertex optics also now respond to slow bias voltage sliders being moved).
  • c1iscaux needed a hard reboot as it wasn’t seen on martian. I power cycled the crate for good measure.
  • Marconi turned back on with correct frequency/amplitude.
  • c0rga is now seen again on martian network. I re-enabled the RGA scanning so that it takes a scan every morning at 4am. 
  • The forepumps for TP2/TP3 are noisier than I remember. The former has ~10,000 hrs on the clock. How often does the tip seal replacement need to happen?
  • HV supplies for ASX/ASY PZTs re-energized.
  • IFO re-aligned for locking.
  • c1oaf and c1daf models restarted. c1oaf required the usual start/stop/start sequence to make the DAQ errors go away, and luckily the FE didn’t crash when the model was unloaded.
  • POX/POY/PRMI 1f carrier/green locking all was smooth.
  • For some reason, the PRC angular FF filters i trained no longer do anything good (but MCL is still good). collected 20mins of PRMI 1f locked data for investigations.
Update 21 Apr 2020 1200: Looking at Attachments #1 and #2, the spectra for motion sensed by the POP QPD does indeed look very different on Apr 6 vs Apr 20. Could be some interference from Oplev loop or maybe some EPICS values didn't get reset correctly, needs more investigation. It doesn't seem reasonable to me that the plant changes by so much (spectra were taken at similar times of the day, ~5pm).
Update 22 Apr 2020 1500: As suspected, the PRM oplev was disabled for whatever reason. Re-enabling it, I recovered the good performance from two weeks ago. ✅ 
Attachment 1: fDomainWF_Apr06.pdf
fDomainWF_Apr06.pdf
Attachment 2: fDomainWF_Apr20.pdf
fDomainWF_Apr20.pdf
  15340   Wed May 20 19:34:58 2020 KojiUpdateGeneralITM spares and New PR3 mirrors transported to Downs for phasemap measurement

Two ITM spares (ITMU01/ITMU02) and five new PR3 mirrors (E1800089 Rev 7-1~Rev7-5) were transported to Downs for phasemap measurement

Attachment 1: container.jpg
container.jpg
  15344   Fri May 22 10:14:47 2020 JordanUpdateGeneralNitrogen Replacement

I was in the lab for Clean and Bake activities and I replaced an empty N2 tank. Left tank is at 2600 psi right tank at ~1300 psi.

  15354   Tue May 26 10:04:54 2020 JordanUpdateGeneralN2 Replacement

Replaced empty N2 tank, left tank at ~2000 psi, right tank ~2600 psi.

  15375   Thu Jun 4 08:45:41 2020 JordanUpdateGeneralPresence at 40m

I will be at the 40m, in the Clean and bake lab today from ~9am to ~3pm.

  15378   Fri Jun 5 08:44:50 2020 JordanUpdateGeneralPresence at 40m

I will be at the 40m, in the Clean and bake lab today from ~9am to ~3pm.

  15385   Tue Jun 9 09:35:02 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 9:30am to 4pm.

  15388   Wed Jun 10 14:00:33 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab from 10am to 4pm today. I will also replace an empty N2 cylinder.

  15390   Thu Jun 11 11:14:12 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 11am to 4pm.

  15395   Fri Jun 12 11:40:14 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 12pm to 4pm.

  15400   Tue Jun 16 08:58:11 2020 JordanUpdateGeneralPresence at 40m

I will be at the 40m today at 10am to deliver optics to Downs and to replace the TP2 controller.

  15403   Tue Jun 16 16:05:26 2020 JordanUpdateGeneralN2 Replacement

I replaced an empty N2 cylinder, there are now two empty tanks in the outside rack.

  15405   Thu Jun 18 09:46:03 2020 JordanUpdateGeneralPresence at 40m

I will be at the 40m today from 9:30am to 4pm.

  15414   Fri Jun 19 08:47:10 2020 JordanUpdateGeneralPresence at 40m

I will be at the 40m today from 9am to 3pm.

  15416   Fri Jun 19 11:02:10 2020 ChubUpdateGeneralcustom feedthrough flanges are here!

The four 4x25DSUB and single 8x25DSUB feedthrough flanges have arrived and will be picked up from the dock and brought to the 40M lab.

  15420   Fri Jun 19 19:21:25 2020 gautamUpdateGeneralPSL shutter re-opened

The PSL shutter was closed from the vacuum interlock trip. Today, I did the following:

  • Re-aligned input beam to PMC to recover high transmission / low reflection.
  • Re-set the LSC offsets.
  • ETMX watchdog was tripped. Reset it.
  • Opened the PSL shutter, IMC autolocker was able to lock the cavity almost immediately.
  • Tested POX/POY locking, ran the ASS to maximize single arm transmission.

All looks good for now. I will probably get back to PRFPMI locking Monday.

  15422   Mon Jun 22 13:16:38 2020 JordanUpdateGeneralPresence at 40m

I will be at the 40m today from 11am to 4pm.

  15426   Wed Jun 24 10:14:56 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 10am to 4pm.

  15430   Thu Jun 25 11:09:01 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab from 11pm to 4pm

  15432   Fri Jun 26 11:00:52 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 11am to 4pm.

  15437   Mon Jun 29 11:41:04 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 11:30am to 4pm

  15441   Tue Jun 30 08:50:12 2020 JordanUpdateGeneralPresence at 40m

I will be in the clean and bake lab today from 9am to 4pm.

  15444   Wed Jul 1 08:51:52 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab from 9am to 4pm today.

  15448   Thu Jul 2 16:51:23 2020 JordanUpdateGeneralBathroom Science

As part of an ongoing effort to improve airflow in workspaces/bathrooms on campus, I have installed an air scrubber unit in each of the bathrooms at the 40m lab.

Attachment 1: AirScrubber40m.jpg
AirScrubber40m.jpg
  15453   Mon Jul 6 08:48:15 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 8:30am to 4pm

  15459   Wed Jul 8 08:51:35 2020 JordanUpdateGeneralPresence at 40m

I will be in the clean and bake lab today from 9am to 3pm.

  15461   Thu Jul 9 09:22:44 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 9am to 3pm

  15467   Fri Jul 10 10:37:30 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake lab today from 9am to 4pm

  15478   Tue Jul 14 09:04:53 2020 JordanUpdateGeneralPresence at 40m

I will be in the Clean and Bake Lab today from 9am to 4pm.

  15485   Wed Jul 15 19:23:44 2020 gautamUpdateGeneralEmergency light on in control room

The emergency lamps above the exit sign on the NW entrance to the control room are on. I tried opening and closing the door, but it remains on. Probably nothing to worry about, but noting here anyway.

  15486   Wed Jul 15 19:51:51 2020 KojiUpdateGeneralEmergency light on in control room

It happened before too. Doesn't it say it has occasional self-testing or something?

  15487   Wed Jul 15 20:58:40 2020 gautamUpdateGeneralEmergency light on in control room

True - it is now not on anymore.

Quote:

It happened before too. Doesn't it say it has occasional self-testing or something?

  15490   Thu Jul 16 14:41:22 2020 gautamUpdateGeneralFire extinguisher inspection

The (masked) tech accessed all areas in the lab (office area, control room, VEA) between ~230pm-3pm. The laser safety goggles he used have been kept aside for appropriate sanitaiton.

  15491   Fri Jul 17 00:18:13 2020 gautamUpdateGeneralLocking updat
  1. I found that an EPICS channel wasn't reset to the correct value by burtrestore after the FE bootfest yesterday.
    • This cost me the whole of last night, found it finally tonight. 
    • I'll try and modify the locking scripts to better capture such errors, but ideally, we should just use Guardian or something since it's made for this purpose already.
    • Anyways, tonight I was able to re-acquire the PRFPMI lock in a completely scripted way.
  2. Locking CARM on POX remains out of reach.
    • I think this has to do with the fact that the zero-crossing of the CARM and REFL error signals are dependent on the 3f PRCL/MICH error point offsets.
    • So even if the DC gain is right, the fact that we use POX for the digital AO path and REFL for the analog AO path is leading to some conflict I think.
    • Ran out of energy tonight, I'll try again tomorrow.

The DQ channels of the ETM coils were active tonight, so I'll make the coil driver actuation budget over the next couple of days.

ELOG V3.1.3-