HugoP, JimW
 

The payload flag input was disabled on the following HEPI top-level models:

• h1hpiham4.mdl
• h1hpiham5.mdl
• h1hpiham6.mdl

This modification was performed to allow commissioning on those HEPIs. Changes will be reverted once suspensions are installed.

The $Id$ and $HeadURL$ tags were updated as well.

Models are recompiled, restarted, and commited under the SVN.

Work was performed under WP #4114, which is now closed.

Stefan recently had upgraded the PSL's frequency stabilization servo (FSS), and its interaction with the input mode cleaner (see LHO aLOG 7571). However, because new Guardian development only got the mode cleaner up and running the evening Jamie left (see LHO aLOG 7472), it's been in a sort of unused, half-baked, off, state sense then. Jamie's on site again, now so we'll continue debugging and getting the Guardian infrastructure up and running to production-level, leave-on-all-the-time state. Until then, while we want to use the mode cleaner for characterization studies, I've restored the full hierarchical lock using, "the shortest IMC autolocker," from (the admittedly unofficial and obscure location):
/opt/rtcds/userapps/release/ioo/h1/scripts/imc/sballmer/MClockwatch
originally cited in LHO aLOG 7475.

This script is now (stupidly) running on opsws3. If it dies for some reason, we'll restart on the guardian script machine like we've done with the various other version of the autolocker (see 7289). If the real guardian stands up (please), we'll drop this auto-locking method like it's hot. 

Following alogs https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7609 and https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7604, I have performed measurements to evaluate:
- The origin of the 6.18Hz noise
- The effect of the feedforward
- The transmissibility while driving HEPI (to be above the noise floor of the instruments when the ISI is controlled and excited by the ground motion)

Results from the past:
1- There was already a tiny feature (barely noticeable) around 6Hz when the isolation loops were closed for the first time on June 20th (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=6832). In the presented spectra, feed forward control was not engaged.
2- In https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=4874, feedforward stability analysis was performed on ETMY. It was shown that the risk of instability was limited when using the feedforward from stage 0 to stage 1.


New results:
I drove (white noise) simultaneously all HEPI actuators in Cartesian basis such that GS13s are above their noise floor when the ISI is controlled. Then, I measured transfer functions from the HEPI L4C to the GS13 in two configurations (with and without feedforward). Transfer functions are presented in attachment.
1- The coherence below 100mHz is low since the white noise was injected by the HEPI Feedforward path (parallel path to isolation path) and the HEPI is controlled in position at 100mHz
2- The 6.18Hz spike is not visible in Y, RZ and barely visible in Rz. It is more visible in the vertical degrees of freedom.
3- Feedforward is decently tuned to tackle the [2;15]Hz frequency band. The zero created by the feedforward is around 6.18Hz (Is it coincidence?).
4- There is no coherence at 6.18Hz from the input motion to the GS13. (spikes don’t seem to be created by the input motion)
5- Isolation at 1Hz is pretty good (80dB)
6 - Note a pretty high transmissibility on Y and Z around 30Hz created by the zero of HEPI.

Started DTT transfer functions to study vertical to longitudinal coupling on the BeamSplitter (~1hour)

I've completed the vacuum crate reboots as specified under WP4113.  h0vemx, h0vemy, h0veey, and h0veex have all been rebooted using the new VxWorks boot server, vxboot, with no apparent issues (at this time).  These are the last of the VME systems requiring reconfiguration, which means the old boot setup can now be retired.  At the same time I moved these systems over to the new network switches installed in the outbuildings, in preparation for the old switches being removed.

PRM lower masses transfer functions from July 15th have been exported and are plotted in the attached documents below

(1) H1 PRM M2-M2 (July 2013) TF in 3 DOF (L P Y) plotted against hsts model (in blue) L1 PRM (July 2013 in orange ) and H1 PR2 (July 2013 in pink)

(2) H1 PRM M3-M3 (July 2013) TF in 3 DOF (L P Y) plotted against hsts model (in blue) L1 PRM (July 2013 in orange) and H1 PR2  (July 2013 in pink)

Both set of measurements are showing good agreement with the model, llo prm and lho pr2

Data, scripts and pdf files have been commited to the svn as of this entry

Note :

Since PRM M2 triple acquisition driver chassis hasn't been modified yet, the calibration factor in "calib_hsts.m" (living in sus/trunk/HSTS/Common/MatlabTools/) has been set to 0.32 mA/V, as described in the hsts electronics drawing summary. Value will need to be changed to 3 mA/V accordingly with driver's modif.

on opsws8, at 04-Sep-2013 09:35:28 PDT. It's gunna take 5* hours. 

*This is ridiculous!  I can get this done in DTT in an hour. I'm gunna dive into the what-has-become 16 nested layers functions and find out why it's taking so darn long. Sheesh!

After "resting" one of the three cooling units in the MSR, here is the subsequent temperature increase (two day minute trend plot). The Temp probe is located on top of the racks at the mid point.

Attached are plots of dust counts requested from 4 PM September 2 to 4 PM September 3.

Transfer functions are running overnight on both HEPI-HAM2 and HEPI-HAM3.

In the attached spectra (stage 2 Z motion), the isolation is really good except at 6.18Hz. It seems that some electronic noise is reinjected in the system. Some noise hunt is ongoing.

- Fire Department briefly on site

- Water refill

- Mats changed

- Concrete pouring for outreach

- TMS at EX work ongoing

- HAM ISI&HEPI testing

- Initial alignment at test stand working on ITMX

- HAM 2&3 commissioning measurements

- Recovery from FW0 failure

Top mass was freed. 

The cable buncle from the top mass to the ISI table was slightly bent and pulled so that it wouldn't lean on the edge of the top mass.

The top mass and the tele/table were both rebalanced.

BOSEMs were centered.

Temporary alignment stabilization toolings (D1100613)  were installed and adjusted such that the ISC table barely sit on top of the set screws. We weren't able to find the new ones, and we weren't sure if new ones were made at all, so we used the old ones from H2 EY installation.Without these, mounting the alignment target by IAS will tip the TMS balance by a huge amount.

Now TMS is ready for IAS work, but unfortunately the large alignment target of IAS didn't fit the TMS tele, four screw holes should be made larger.

Dan repaired the SATABO/QFS disk system h1fw0/h1nds0 use. I restarted the framewriter at 12:27 today, prior to that fw0 would only run for about 10 minutes at a time so the frame file inventory is very disjointed.

Unit 1 in the MSR has been turned OFF. Units 2 and 3 are ON with setpoints 70F. Prior to this all three units have been running for several months since the repair of Unit 2.

Last Friday, I created a set of complementary filters with a 40mHz blend frequency. I computed newblend filters and installed them on stage 1. After turning on the isolation loops (level 3) and lowering the blend frequency at 40mHz on stage 1 and 100mHz on stage 2, I left the BSC-ISI (ITMY) isolated for the week-end. Note that the HEPI was controlled in position (100mHz) and the sensor correction was not engaged.

This configuration passed the 3-day week-end. I have attached a nice spectra of the stage 2 motion in the Y direction (seen by the GS13s).

GS-13 pod number 68 arrived with damaged flexures from shipping some time ago. After replacing the broken flexures, re-sealing the pod and filling it with Neon, I leak checked it in the modified VBO A.

Initially I had some issues with an errant signal of Neon, but this was because I had forgotten to lower the ionizing voltage. Argon from a small air leak was doubly ionizing and appearing as Neon in the RGA. After lowering the voltage to 50v everything cleaned up nicely.

The GS-13 tested good, coming out under the 3e-10 torr L/s leak rate requirement set by the VRB.

- Corey, Andres, Hugh, Keita, Cheryl

TMSX telescope moved by Genie from the TMS lab to the VEA.  The telescope suspension wires were attached, and the telescope is now suspended.  The upper mass is still locked by EQ stops.  The vertical safety wire is installed, and the swing stop assembly is positioned under TMSX.  A rod on the swing stop assembly goes through two eye bolts on TMSX, preventing it from swinging into the QUAD.

Gymnastics of turning the telescope 180 degrees was documented more thoroughly in pictures today.

The telescope safety support beams were installed Wednesday (my idea), which mean the Genie would not fit under the upper structure, so we rotated the front beam out of the way after removing 3 of 4 bolts.

I returned to EX after lunch and attached the 4 cables to the ISC table.  Cables come from the clamp in the center of the upper mass, attach to raised wire clamps, and connect to the cable brackets on the ISC table.  They will need further tweaking after the upper mass is freed, to make sure they are not touching.

Pictures added later.