Added a ZFL-500HLN amplifier to the ALS DIFF RF path.

We are investigating the Z to RZ couplings that are currently limiting our ability to improve the Yaw isolation.

A measurement was performed on ITMY yesterdaty night. The unit was controlled with level 3 controlers and  high blend (T750mHz) in all 12 degrees of freedoms.

It has been driven at the Exc point of the Stage 1 Z isolation filter, therefore the drive was in [nm].  A white noise drive was used (filtered to put power on the low frequencies)

The plot attached shows the reponse of the inertial sensor. The top plot (Stage 1 T240s) are in [nm/s], [nrad/s] per unit of drive [nm]. The bottom plot (Stage 2 GS13s) are in [nm/s^3], [nrad/s^3] per unit of drive [nm].

The Z, RX, and RY response are as expected: slope goes as f, large main coupling,  cross coupling at sub-percent level...

X, and Y couplings are in high in the T240s, but suprinsingly the coherence is not very good.

As for RZ, which is the main focus of this measurement:

- the T240s show a 1/f slop that we assume is  due to magnetic couplings

- the GS13s shows the f^3 slope as expected, confirming the signal on the T240 is likely not real motion.

We have set up a measurement in the staging building to measure the direct coupling from one actuator to the T240s.

Earthquake tripped ISIs last night, looks like it's the one off the coast of Oregon 5.1 @ 10km.

Install Activities:

- TCS Team is going to work on HWS table until 2 PM and then go to laser hazard and align the CO2Y table, CO2X's overnight run looks like its working well.

- HAM5 SR3 alignment is ongoing with Jason and Jeff. After they're done with the alignment, fine adjustments and transfer functions will begin.

- Margot and Travis are working on ACB assembly, Mitch gave a hand yesterday but he might be working with SEI today

- Staging building work is ongoing with SEI team with help from Scotty from Apollo.  Fabrice wants to take magnetic coupling measurements.

- ESD work is ongoing, both end stations have their various problems.  The problem could be in-vacuum and might need the June vent to fix although the problem has not been precisely determined yet.

- Integration is ongoing, some progess last night but a few problems.

- During June-July vent, it's probable that we'll be implementing wire-hung baffles on BS and an ISS on HAM2

Maintinence:

- LN2 @ EX

- Jeff Kissel is going to implement new SUS code

- Christina and Terry are going to take stuff off-site

Find attached the watchdogs trips summary of last week/beginning of this week.

Nothing unusual to report, except one specific trip on ISI-ETMY, where we can see some "glitchiness" in the drive. I've noticed the same behavior on this unit two weeks ago. We're still investigating.

I've added 10.22.0.0/20 to the ufw rules on vxboot to allow ssh.

I've rebooted cdsfs0 to perform the work specified in WP4620.  To wit, available OS patches were applied and the NFS options for rpc.mountd were changed to allow the proper operation of group permissions on /ligo (specifically, --manage-gids was removed from RPCMOUNDOPTS in /etc/defaults/nfs-kernel-server).

NOTE: This means that group permissions should now operate correctly on /ligo should you wish to use them to share files.

Here is the list of commissioning task for the next 7-14 days:

Green team (XY-arm):

• ALS DIFF locking.
• Hand-off ALS signals to interferometer signals.
• Noise hunting.

Blue team (X/Y-arm):

• Revisit the WFS with the now improved beam quality.

Red team:

• Center the red QPDs in EX/EY.
• Trans path in Y-arm.

SEI/SUS team:

• Try to fix EY ESD drive.
• Commission high bandwidth length drive to SUS/ESD.

Arnaud, Alexa, Sheila, Kiwamu,

Tonight we tried closing the ALS diff loop, but it did not go well. We observed a high peak at 1 Hz, which we don't understand and seems to prevent us from going back to the high UGF configuration that we achieved in the last week. Since we ran out our energy at this moment, we will have a close look tomorrow. This may be a gain peaking , a bad cross over or some stupid reason.

We tried increasing the servo gain to the nominal value (which should give a UGF of 4 Hz), but today we were not able to reach that point due to the instability at 1 Hz. So we mostly worked with a lower UGF by a factor of 3 or 4 at which the loop was relatively stable. Changing the TST gain did not seem to help. The attaches s the in-loop error signal (show in red) and free-running noise (in black). When we closed the loop, a oscillation happened at 1 Hz. Hmmmm.....

A good new is that Sheila succeeded in deploying a guardian for the ALS diff control. So it now allows us to keep track of good settings.

After Sheila saw some excess angular motion caused by the length drive, I tried improving the decoupling of EX and EY UIM.

• We took a swept sine measurement of Length to Pitch as well as Length to Yaw on friday night, driving through L1_LOCK_L_EXC, monitoring the oplevs, without any decoupling filters engaged. The measurements are saved as 2014-05-05_H1SUSETMX_L1L2PY_SweptSine.xml under SusSVN/sus/trunk/QUAD/H1/{ETMX/ETMY}/SAGL1/Data
• Those measurements were used to make a new fit, with a better resolution of Qs and phase than previous filters. See both pdfs for the fits of L2P w new measurement, P2P w old measurement and the ratio L2P/P2P
• The old filters were moved in FM6 for ETMX and FM6/FM7 for ETMY. They are called L2Plegacy
• A measurement was taken to test the L2P decoupling on EX, cf attached screenshot EX_UIM_decoupling. Even though the fit is pretty good, we only see 10dB attenuation in the .5Hz region (green w decoupling filters vs red without). Keita advised to tweak the overall gain.
• By doing quick tests its unclear if L2Y is providing anything good. I left the drivealign UIM input switches off for now. Will do more investigation tomorrow.

D. Hosken, G. Grabeel, T. Vo

Today we wanted get the CO2X laser table in a position to run the closed system overnight.  We've taken some extensive precautions using redundant beam dumps along the laser path to make sure that we don't have stray beams and that the main laser beam does not get into the vacuum system via the periscope.

Beam dump locations:
- After the output beamsplitter
- Secondary beam dump after the final steering mirror
- A shield between the second iris and the first periscope mirror

The rotation stage was power-cycled to see if we could reproduce the errors that M. Heintze saw last week but we couldn't get the same behavior.  I also forced the Motor Warning label to be "FALSE".  We've left the rotation stage close to minimum power with about 2.2 Watts going through after the polarizers so we can monitor the beam power down stream with an on-table power meter that should be reading ~.199 Volts (working but not yet calibrated).  We expect it to go up and down a bit because of the temperature fluctuations and we left PZT/Chiller loop open.  The jumper for the interlock for the rotation stage is removed so that no one in the control room can rotate the HWP via EPICS.


We've left the HEPA and the lights off at 6:00 PM PT,  The table is locked and we've tagged out the keys and left them in the control room box with our phone numbers attached.

ISS PD adjustments:
We removed the covers and beam dump to let light onto the ISS PDs.  We also translated the PDs back ~2-3 mm back and fine-tuned the alignment onto the center of the PDS.

Temperature Sensors: 
The temperature sensors were not working very well at first.  There were only 2/6 working which turned into 1/6 as we were trying to troubleshoot.  Turns out that the problem was due to a loose connection at the feedthrough, once we tightened the connector screws, everything worked pretty well.  We'll be monitoring these temperatures quite closely during the overnight observation because it'll give us a first-look indication if anything is wrong.

H1-TCS-C_CO2_X_TEMPERATURESENSOR1 = AOM
H1-TCS-C_CO2_X_TEMPERATURESENSOR2 = PLUMBING MANIFOLD
H1-TCS-C_CO2_X_TEMPERATURESENSOR3 = AOM DRIVER
H1-TCS-C_CO2_X_TEMPERATURESENSOR4 = WATERCOOLED BEAM DUMP
H1-TCS-C_CO2_X_TEMPERATURESENSOR5 = RF DRIVER

This morning the end Y laser was off and had no power, Richard looked around and noticed that there was an extension chord which had come loose.  He changed the way that this is plugged in so this should not happen again.

Alexa and I placed the GigE camera on ISCT1 for the X arm.  

I also went out to End Y a few times to work on the IR path there.  The LSC PD is now aligned for the IR trans, the gain setting is 60dB.  The power cable is flaky for the analog camera.  Aaron and Fil helped get the signal to the control room. Although the spot is faint you can see it in the upper right hand corner of channel A on the lower monitor. 

8:54 am, Jeff and Andres to the CS VEA, work around HAM4/5 area.
9:05 am, Jason to the CS VEA, East bay area for alignment work. <-- Done by 12:33 pm.
9:20 am, Jeff requested aide from Apollo, work on and around HAM6, 30 min. curtain work while using a small scissors lift.
9:20 am, Travis to the CS VEA, West bay area for ACB assembly work.
9:30 am, Betsy  to the CS VEA, East bay area work.
9:42 am, Richard to End Y VEA, ESD work.
10:18 am, David H. to CS VEA, near HAM4, Hartmann sensor table work.
11:00 am, Restarted video4, loaded camera views only, no striptool, elimination process for "freezing" issue.
12:00 pm, ACB crew out of CS VEA.
12:45 pm, Cris to X-End station VEA, cleaning.
12:45 pm, Karen to Y-End station VEA, cleaning.
1:11 pm, Travis to CS VEA, West bay area for ACB work.
1:13 pm, Mitchell to CS VEA, West bay area for ACB work. <-- Done 2:20 pm.
1:16 pm, Betsy to CS VEA, West bay area for ACB work.
1:45 pm, Justin transitioned the LVEA to laser hazard.
2:30 pm, Thomas and David to CS VEA, East bay area for TCS work, powering laser inside table.
2:45 pm, Mark L. to CS VEA, TCS install work.
3:45 pm, Jeff and Andres to CS VEA cleaning area. <-- done 4:05 pm

 

I noticed that the PD offset nulling script for PRMI did not run for some reason. I looked into the script and found that this was due to too-many PD channels requested to tdsavg at once. So I modified the script so that it divides the PDs into a number of group. This seems running OK at a expense of the processing time. The modified script is named as lsc/h1/scripts/pdOffsetNull_ver2.py. I also checked this script into the svn.

• X axis (lateral): +0.03 mm (north)
  • Tolerance: ±3.0 mm
• Y axis (longitudinal): +0.3 mm (west)
  • Tolerance: ±3.0 mm
• Z axis (vertical): +0.9 mm (high)
  • Tolerance: ±3.0 mm

I have begun setup for the pitch/yaw alignment; will finish fine set tomorrow morning and we will commence with SR3 pitch/yaw alignment.

BS ISI tripped at 12:25pm. Certainly due to a second earthquake (5.8 southern east pacific rise)