Red Team

If we believe the recent calibration of the POPAIR_B_RF18 (see alog 10442), the current recycling gain is roughly 6 with the ITMY ring heater at 7 W.

The attached is a trend of the POPAIR_B_RF18 from this morning. It occasionally became a good alignment which gave us about 60 uW. This is greater by a factor of 3.6 than the one  when the ring heater was off (see alog 10448) -- remember that we used to have something like 16.5 uW at this diode.

[Jeff Arnaud]

ITMY top mass pitch actuation to test mass pitch response measured by the optical lever was taken on friday afternoon using a "colored" white noise excitation. This method works fine for measuring main couplings (P2P for eg), but hasn't been tested for the cross couplings (L2P). The reason the white noise is filtered through a low pass is because, when increasing the overall amplitude of the signal, it would saturate the DAC at higher frequencies (because of the antiAcqFilter in the coilout filter bank which has a zero at 1Hz and a pole at 30Hz).
The measurement was fairly quick (less than one hour) and gives good coherence until 3Hz. I attached a comparison of the measurement against the "wirerehang" model.

Note that the model and the measurement are very well matching until 2 Hz, but slightly differs (~2%) for the 3rd and 4th pitch mode (2.5 and 2.8Hz). From 3Hz, the signal is two noisy to make any comparison. I added (from Jeff's advise) the top to top pitch TF (2nd attachement), to see how the pitch3 and pitch4 differs at the top level.

Note also that the sign of the oplev phase signal had to be flipped to match the model, so Pitch oplev sign convention differs than SUS.

The next step is to do the same comparison for L2P, then fit the measured (or modeled?) TFs in order to create the L2P decoupling filter.

8:57 --> PSL Check List (OK)
9:30-11:15 Heading to MidY- Jodi
9:40-10:16 Searching for parts at MidY/EndX – Alexa/Jax
9:45-12:25 HAM4 HEPI attachment work – Huge/Mitchell
10:33-12:00 Going into LVEA West Bay area – Travis
10:45-10:56 Heading into LVEA to test a dust monitor – Richard
11:21-12:00 Going into LEVA – Thomas Vo
13:00-15:12 Heading to EndX/EndY (cleaning) - Cris
12:20-14:24 Back to MidY – Jodi
13:08-      Working on EndY ISC – Filiberto/Aaron
13:18-15:16 Work on ITM Y TCS (ring heater) – Thomas/Greg 
13:30-      Heading to End Y to unlock the quad – Travis
13:31-14:20 Going to End Y to install dust monitor #2 – Jeff B.
13:37-15:34 Working on End Y (fiber attachment) – Cyrus
14:05 ---> LVEA transitioned to Laser Hazard

First screenshot: Even though the left MEDM screen makes it look like STAGE1 whitener/awhitener pair is all green though the awhitener is off and mismatched with whitener. Also, "L1 ASC" label is hard coded.Silly.

Second screenshot: After a fix. MEDM is displaying the whitener and awhitener separately. "Off" and "On" buttons (which worked) still work on both at the same time. Also it says H1 when it's H1. Not silly.

Red team,

We wanted to calibrate the POPAIR_B demodulated signals into something meaningful. We calibrated them into uW in the digital system using the measured calibration factors (see alog 9845). See the attached for how they now look. Also, we accordinly corrected the LSC trigger thresholds in the guardian which depend on the POPAIR_B_ calibration. We confirmed that the guardian works fine with this new calibration.

Mitchell & I got the Horizontal L4Cs leveled this morning on WHAM4.  One Dial Indicator tree had been completely dislodged from the system.  Please try to avoid these and certainly let us know when you possibly disturb them, thanks.  No issues to report in the L4C leveling.

Next, Actuator attachment (2 days) then the doors.  Vertical L4Cs can go on after the doors.

Since an SR560 can only take 1 V dc input, and can only output 10 Vpp, you can use this box to extend the input and output ranges of an SR560 by a factor of two.

This morning I went to the EY and floated the ISI. Fairly straight forward, with no difficulties to report. I also adjusted lockers, fixed some cabling issues and re-gapped the CPS's. I then went into the chamber below (mostly to retrieve some hardware I dropped (sorry Betsy)) and plugged in a cable for Richard.  I left the ISI locked, in case any other teams need to go in and work. As far as SEI is concerned, we are ready for TF's.

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10331

To recap, OLs, bias sliders and BOSEMs were calibrated using baffle PDs (baffle PD placement is here: https://alog.ligo-wa.caltech.edu/aLOG/uploads/9087_20131224160343_alog.jpg).

OL for ITM has a factor of 2 error somewhere, and the sign convention for OL PIT is inconsistent with SUS convention.

OL for ETM doesn't have a factor of 2, the sign convention for OL PIT is good but YAW is not.

I telneted into the procServ IOC for end Y and saw the following error messages:

epics> attempting to connect to host: 10.1.3.64 port: 8003
Error: tcp_connect: socket: Too many open files
CAS: Client accept error was "Too many open files"
attempting to connect to host: 10.1.3.64 port: 8003
Error: tcp_connect: socket: Too many open files
attempting to connect to host: 10.1.3.64 port: 8003
Error: tcp_connect: socket: Too many open files
attempting to connect to host: 10.1.3.64 port: 8003
Error: tcp_connect: socket: Too many open files
CAS: Client accept error was "Too many open files"

I restarted the IOC, and the errors did not reappear, but none of the expected state reporting messages were shown. I tried pinging the Comtrol at 10.1.3.64 and did not get a response.

Since the measurement is not done yet, I asked Jeff to give me the model of the TF from PUM to the test mass angle to angle.

Since I don't know enough about the model, I made the model generate the TF data, and used my wrapper for vectfit3 named happyVectfit to fit the model TF and invert it. This way when the real TF is measured I can use the same script without much modification.

You want to give happyVectfit a large order of fit, which initially produces many useless poles and zeros, but the script weeds out useless ones automatically, making things almost always hands-free. If you want you can give the script some criteria regarding what poles/zeros are useless.

~controls/keita.kawabe/fit/invertPUM2TSTmodel.m looks at the model, calls happyVectfit, inverts the fit, discards unstable poles and outputs plots (attached) as well as foton-compatible filter definitions.

In the attached plots, each DOF for each mass has two pages, the first one being the model TF and the fit, the second one being the filter generated and the residual that is just a pendular type TF. The difference between ITM and ETM is wire VS fiber.

According to Jeff the PIT resonance of the model is inconsistent with reality so we still need to wait for the real measurement.

Just to make sure, the newly generated filters are put in H1:SUS-ITMX_L2_DRIVEALIGN_P2P, Y2Y,  ETMX P2P and Y2Y as invP2P and invY2Y.

Kiwamu, Yuta, Stefan

Since all our OLG functions in PRMI never really made any sense, we locked PRY and carefully measured the actuation functions from BS to REFL_45_I and from PRM to REFL_45_I.

Plot 1 shows both BS and PRM transfer functions in ctsREFL45 / cts ISCinf drive (i.e. total actuation function). Both are closed loop corrected.
The BS makes sense: it is almost 1/f^2. I don't understand the PRM - need to sleep over it.

Plot 2 shows the OLG and the CLG.

Plot 3 is a snapshot of (almost) all relevant settings.

The data is in ~controls/sballmer/20140302:
BSdrive.xml
PRMdrive.xml
data/BS2REFL_mag_rad.txt
data/PRM2REFL_mag_rad.txt
data/plotIt.m

To do next: 
-Understand PRM: for one we should check that the acquire mode TF of PRM M3 is as expected.
-Fit inverse actuation filters that make PRM and BS match

Before starting measuring Pitch to Pitch on ITMY, I realized the oplev signal was oscillating at high frequencies. I took a spectra and compared with other oplevs, and the noise floor from 1000Hz is ~2 orders of magnitude higher compared to ITMX. Thomas pointed out that this oplev doesn't have an analog whitening filter yet, so we should double check when it will be installed.
dtt template was saved under SusSVN/sus/trunk/QUAD/H1/ITMY/SAGL2/Data/2014-02-28_Oplev_Spectra.xml

After much of the day was spent for recovery from maintenance, we wanted to make green WFS wider band, for which we need to redo penultimate mass to final mass pit to pit and yaw to yaw measurement, and since we're using OLs, and since OL whitening were bad but are now good, and since ISI is performing much better than the beginning of the HIFO_X,  we decided to calibrate OL using baffle PDs again. And since we might want to use TMS for alignment we also did the calibration measurement for TMS.

We only had time for TMS and ITMX for today.

TMS:

Used H1:AOS-ITMX_BAFFLEPD_1_POWER and 3_POWER (3 is actually connected to PD4). Also recorded H1:SUS-ETMX_M0_DAMP_P_IN1 and H1:SUS-ETMX_M0_DAMP_Y_IN1 and used tdsavg.

"delta claimed" is the TMS rotation measured as the difference of bias offsets between PD4 and PD1, "delta physical" is derived from baffle diode drawing and the arm length of 4000m (see the drawing in this alog: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=9087).

Positive PIT means the beam points down. Positive YAW means the beam rotates counter-clockwise viewed from the top.

ITMX:

Used H1:AOS-ETMX_BAFFLEPD_1_POWER and H1:AOS-ETMX_BAFFLEPD_4_POWER. Also recorded H1:SUS-ITMX_L3_OPLEV_PIT_OUT and H1:SUS-ITMX_L3_OPLEV_YAW_OUT.

"delta reality" is half the angle formed by PD4, ETM and PD1 as the beam rotates twice the angle of the ETM.

Positive PIT means that the optic points down. Positive YAW means the beam rotates counter-clockwise viewed from the top. OL has different sign convention from SUS for PIT here.

Didn't have time to do ETMX.