I noticed from the ODC summary that the ISS was running out of range again. I changed the set point (ISS_REFSIGNAL) from -1.93 to -1.88. I also verified that this was not due to a noise eater oscillation (ODC didn't indicate it as such, and toggling it didn't change it.)
Foton files were cleaned up for every SEI platform (ISI + HEPI). Details about the cleanup process can be found in SEI aLog #370
Every SEI platform was turned off, had its filter coefficient reloaded, and turned back on exepted ETMX ISI and HEPI, which ISC commissioners needed. ETMX's platforms will get their filters reloaded at the next window of opportunity.
Work started at 4:50PM and just finished. It was performed under WP #4435 which is now closed.
SEI crew (Jim, Hugh, Hugo) left its platforms in the following state:
Hugh and I mostly finished cabling ETMY ISI today, but were held up by an issue with the CPS's and some broken test feed thru components. After we powered up the CPS's, we were systematically disconnecting sensors to verify routing and we noticed that the corners 2 and 3 were acting weird. After rounds of calling Richard, plugging and unplugging various cables, we figured out that the ribbon cable that carries the sync signal from the satellite rack chassis to it's power/distribution board was plugged in backwards. The other racks have keyed cables to prevent this, but this rack had an unkeyed cable. After fixing this we found that we also have a dead sensor, further debugging has that narrowed down to a broken probe. We don't have time today to finish balancing, so we'll continue on Tuesday.
Late entry, DAQ restart performed at 15:59PST.
Restarted the DAQ for three reasons:
The frame broadcaster had the following channels added
8:50 PSL Check ok. NOTE: ISS Diffracted Power is low (1.4%) and unstable with peaks over 20%. It should be 5-15%) 9:00-12:00 Going to End X to do cabling – Luis/Filiberto 10:00-12:00 Baffle work (disassembling contaminated scrapple baffle, searching for parts for arm cavity installation, and general cleanup) in LVEA West bay – Mitchell 11:01-11:03 DAQ restart – Dave 11:10-11:45 heading into the LVEA to get parts – Gerardo 12:12-12:15 Change h1iopsusey model to remove the DC OSEM component from the software watchdog – Dave 14:15-15:51 PCAL assembly on H2 PSL – Joe 14:22- Taking some parts to End Y – Corey 15:02-15:50 Back into the LVEA West bay (Searching and organizing Baffle parts – Mitchell 15:59 DAQ restart - Dave NOTE: I noticed that the ISS Diffracted Power has been unstable today. It was about 1.4% in the morning with high peaks over 20% during the day (is this normal?). Based on one of the PSL trainings it should be 5-15%. I have added some pics from today and one from the last 5 days.
We could not close the ISO loops on HAM4-ISI yesterday, even thought those are Level 1 generic loops. We ran transfer functions overnight, which allowed me to tweak the symmetrization filters. I also corrected a few minor typos in the unit-specific scripts.
ISO Lv1 loops are now stable with any of the 4x blend filters installed:
I duplicated ISO Lv1 into the filter modules reserved to Lv2 and Lv3. Those use more that one filter bank. I filled the extra filter banks with gains of one. Same goes for the Boost filters. Those only use 1x filter module though.
Here is what is loaded in the ISO filter banks:
I tried turning on different combination of ISO and DAMP with the control scripts. They all worked. HAM4-ISI good to go as far as starting Guardian testing goes! 
Will resume on Tuesday
The SR2 Scrapper Baffle (D1200922) was found to have been contaminated sometime during storage. This was discovered while staging for install on HAM 4. The baffle has been dis-assembled and taken to clean and bake to be re-classed.
WP#4447 Created new h1iopsusey model to remove the DC components of the ETMY software watchdog. At the same time I did the same for TMSY though this is not used in the WD trigger circuit. Related changes to the safe.snap and the MEDM screen were made. at 12:17 local time the h1susey models were stopped to install the new IOP model. I tested the WD using the PANIC button on the SUS DACKILL. I then restarted the h1susetmy and h1sustmsy models, burt restoring to 11am today. A DAQ restart is needed for the IOP model, can wait till later.
ETMX hepi tripped, there was activity in the end station electronics rack when the trip happened.
The scripts for plotting the trip, the command scripts for HEPI and the ISI and the buttons to switch the blend filters don't work on the Imac's at the end station. Alexa is working on bringing ETMX back up from the control room.
Jim and I emulated the Sensors and they look correct so we are go for complete sensor plug in. We are still rigging up the CPS and some of the coil driver feedthrus need replacing. It might be optimistic that we'll run transfer functions tonight but maybe. We should be floated and balanced for sure though by the end of the day.
11:01PST restarted DAQ to support Hugo's change of the h1isiham4 model.
h1isiham4.mdl was updated to receive SUS WD signals from h1sussr2.
HAM4-ISI's model was recomiled and restarted successfully (See attached Log.txt). The new version of h1isiham4.mdl was commited to the SVN:
/opt/rtcds/userapps/release/isi/h1/models/h1isiham4.mdl -r7133
The DAQ had was restarted at 11:01AM.
The Safe.snap of HAM4-ISI was updated with the latest matrices and filers to be engaged and commited to the SVN:
/opt/rtcds/userapps/release/isi/h1/burtfiles/h1isiham4_safe.snap -r7132
h1sussr2.mdl still needs to be updated, as it current sends out a constant (coding SUS untripped) to the ISI model. See attached screenshot.
Work was performed under WP #4445 which is now closed.
[Jamie, Lisa, Daniel, Evan]
Two WFS are added to the ALS end models, "A" and "B".
A "standard" ASC servo is added that takes the WFS I phase outputs and EPICS inputs intended to come from camera centroid finding, and puts them through an input matrix/servo filters/output matrix combo. The outputs of the output matrices are sent to a separate servo path with the QPD outputs for ALS PZT input pointing. The outputs of two of the WFS DOFs are intended for feedback to the arm SUS controllers, and are therefore send to the vertex global ASC model for sending to the ITMs and ETMs.
We have committed this to the SVN as revision 7127.
(Accidentally posted this as kiwamu, sorry.)
Additionally, RFM IPC outputs for WFS DOFs have been added.
We have added outputs for the four ALS-X WFS degrees of freedom, which have been newly added to the ALS_END model (see revision 7127). These are intended to be used to feed back onto the X test masses.
We have also added a trigger input to monitor green transmission, but it is currently disabled.
This is SVN revision 7128.
Yuta, Evan, Kiwamu
We steered the picomotors on TMSX again tonight to center the red transmitted light on the QPDs. After a couple of hours of struggling, we managed to bring both of them within their linear range. This is good enough for now as this should be able to monitor some alignment-related signals. The numbers below are the current picomotor settings:
M4 X = -12813, Y = 38475
M14 X = -12810, Y = -75268
Because of this alignment work, we lost the red trans signal and red trans camera view again. We don't have energy to realign them on ISCTEX table at the moment and therefore are leaving it as it is.
This morning we found the beam was clipped coming out of the viewport onto the ISC table, so we moved M4 to get it back. The current position is X:9267 Y: 1665
Also, the IR camera was moved so that the beam was directly incident on it. This doesn't work, you can't se the difference between the different modes. I put it back the way I had it set up originally, with the beam incident on the baffle and the camera focused on the baffle. This was kind of a pain to redo, Alexa and I replaced the dichroic with a green optic to find the image of the green beam, re set up the camera, then replaced the optic.
We see now flashed of up to 60000 counts on the TR X PD.
I am sorry. That's me who changed the camera setup (alog 10086).
For future reference: the CCD was OK without the TV lens last night as the camera automatically adjusts the gain. The higher spatial mode was distigushiable from the 00 mode. Also, the alignment could be done by the infrared when it is on a resonance either by ALS or infrared locking.
J. Kissel Given that this morning's ETM motion provided for difficult arm cavity locking and CARM hand-offing again, I've continued to pursue the long-term stability of the X ARM ISI Performance, by studying the ISI performance at 3 different times. Here's what we learned (or re-learned) from the study today: (1) Today (2014-02-13 17:00 UTC) was a really high-wind day. Yesterday (2013-02-13 04:39 UTC) was a medium-wind day. Two days ago (2014-02-12 01:00 UTC) was a low-wind day. The green team really liked two days ago, they were marginally happy with yesterday, and could not get anything done today. (2) From Robert: "At the X-end, wind, which comes primarily from the Northwest and West and beats against the side of the building, tilting the building, slab, and ground. This motion is seen as increased signal in ground seismometers between 0.02 and 0.1 [Hz]. The corner station, being a shorter, squat building is much less sensitive to wind." (3) In the current configuration, with Level 3 controllers and TCrappy blends, The longitudinal motion of the ETM suspension point is dominated by RY motion between 0.2 and 2 [Hz]. (4) The Level 3 controllers and TCrappy blends attempt to get awesome performance between 0.2 and 2 [Hz], because -- during low-wind days -- the QUAD pitch motion at the test mass between 0.3 and 0.7 [Hz] dominates to cavity motion. When larger than ~80-100 [nrad/rtHz] @ ~0.5 [Hz], the 0.3-0.7 [Hz] angular fluctuations make holding the optical gain constant difficult, and due to the poor quality of the coatings in green the cavity is more likely to fall out of lock. (5) The wind / slab tilt does not obviously increase the ground seismometer signal between 0.3-0.7[Hz] band. (6) During high-wind days, 0.02-0.1 [Hz] pitch motion of the ETM supersedes the 0.3-0.7 [Hz] motion, increasing the RMS motion so much so that the green VCO regularly saturates, kicking the cavity out of lock, again above ~100 [nrad] RMS. (7) The TCrappy displacement sensor blend filter has a broad, factor-of-three-ish gain-peaking amplification hump between 0.01-0.07[Hz]. The filters were pretty good copies of L1's blend filters, where wind and 0.02-0.1 [Hz] motion is regularly pretty darn small. It's merely unfortunate that our ground motion is so volatile and different at these frequencies that we won't be able to use the exact same blend filters between the two IFOs. (8) In order to reduce the cavity motion below the saturation limit of the VCO, one could try to just offload the bulk of the control authority to HEPI along the IPC tidal path up to, say a little past the microseism (but before the QUAD suspension resonances to keep the loop design simple). BUT the ISI's TCrappy filters blend at ~0.06 [Hz], with a *ton* of loop gain from the Level 3 isolation controllers, so any motion injected into HEPI will get ignored / suppressed by the ISI's inertial sensors above the blend frequency. (9) The TCrappy blend filters we used in the design of the Level 3 controllers, and those particular blend filters are only "psuedo" complementary. Though this hasn't been thoroughly tested or confirmed, the belief that this means that TCrappy blends can *only* be used with the Level 3 controllers, and vice versa. The ISI had tripped one or two times while switching from this blend configuration to another, but there's not yet direct evidence that this marginal in-complementarity was cause. (10) The ITM is consistently performing better than the ETM, as measured by the optical lever -- but remember, it's unclear whether we can trust the short-armed ETM lever to be measuring pure pitch below ~0.5 [Hz]. (11) The ITM optical lever's signal consistently has some high-frequency fuzz on it, above 0.5 [Hz] that's clearly visible in the SUM. Stefan suggests we should investigate / replace the laser head to make sure this isn't mode hopping of an old dying diode. (12) One can monitor the blend filter status by watching the H1:ISI-ETMX_ST*_BLND_*_*_CUR_SWSTAT channels. At least in this case where we are using all TCrappy filters in FM5 of the filter banks, with the input, output, offset, and decimation buttons on, the bit-word is 7184. In conclusion, - We need to pay attention to tilt, not just the translational direction of the ISI. - Our performance is volatile, depending on the weather, so need to consider having windy-day vs. calm-day blend filters that we regularly are able to switch between without trouble. - We still have work to do on the ISIs. Sensor correction, which has not been commissioned on either X ARM platforms can perhaps help, but maybe not if we are blending so low. We should most certainly investigate a set of blends with less gain peak in the wind band.
A few things:
Wensday we couldn't get anything done either, in large part because of being tripped much of the day, and yesterday was actually better than Wednesday.
As far as complementarity of the filters, I know that I have been able to bring the ETM to level 3 on stage 1 with 250 blends, but that 750 blends tripped. Also, stage 2 has been at level 2 with 250 blends.
Also, Stefan and I looked at a strip tool yesterday of the control signal to the VCO, and ITM and ETM ST1+ST2 ISO_X output. One of The ETM was clearly moving in phase with the VCO control, and causing saturations.
J. Kissel, S. Dwyer, For reference, the green VCO range is df = 2 MHz (cf. LowNoiseVCO Wikipage). The equivalent length change is dL = 14 um. Calculation details dL / L = df_g / f_g dL / L = df_g / (c / lambda_g) dL = L * lambda_g * df_g / c dL = (4e3 [m]) * (532e-9 [m]) * (2e6 [Hz]) / (3e8 [m/s]) dL = 1.4187e-5 [m]
The data from this entry can be found in the Seismic Repository, under
${SeiSVN}/seismic/Common/Misc/2014-02-13_XARM_PerformanceASDs.xml
[Stefan, Lisa, Kiwamu, Yuta, Evan]
We are trying to center the transmitted X-arm IR on the transmon QPDs, so that we can have an IR alignment reference. The expected power on each QPD is determined as follows:
These numbers give an expected power of 3.7 µW on each QPD.
What we measured was about 600 cts for the sum output on each QPD. We can back out the power on the QPDs as follows:
This gives a power of 4.6 µW on each QPD.
[Keita, Yuta, Evan]
Some corrections:
So the expected and measured numbers are actually much closer.