Added APPSROOT environment variable to the default user environment with a value of either /ligo/apps/linux-x86_64 or /ligo/apps/darwin-x86_64 as appropriate. Also fixed MANPATH environment variable value so it also points to system man pages.
Here is the list of commissioning task for the next 7-14 days:
Green team:
Red team:
Blue team (ALS WFS):
Blue team (ISCTEY, delayed):
TMS:
SEI/SUS team:
This morning, with a little help from Hugh, I finished preparing the ISI for chamberside check out. I replaced the bad St1H3 cps, fixed some cable routing issues, then floated and balanced the stages. All went relatively painless, aside from the chaotic, cramped quarters in the end station (cables EVERYWHERE!). Now, all the sensors seem functional and I've started running some basic tests. Should be starting on tf's soon.
Working on unlocking SR2 suspension.
The default nds server is now h1nds1 for new applications that use it. It had been moved to h1nds0 temporarily to allow maintenance on h1fw1.
Jim and Dave
Jim removed the unneeded second 16bit DAC card from the h1lsc0 IO Chassis this morning, starting at 10:21. I made the appropriate model change to h1ioplsc0.mdl (userapps SVN r7165).
This closes WP4446
I swtiched the stage one blends on ETMX back to Tcrappy, Attached is a screen shot of the opLevs, in units of urad, the green references are from before (stage 1 level 3, 250mHz blends, stage 2 level2 Tcrappy). The red is now, with Tcrappy on both stages.
With the 250s, the Pitch rms is 0.7urad with the 250s, with tcrappy it is 0.5urad rms. (At the same times, the ITM rms is ust under 0.3 urad)
This is saved as sheila.dwyer/ALS/HIFOX/ISIs/TcrappyFeb18.xml
Filiburto replaced the DC power supply in h1susauxh56's IO Chassis. We restarted the front end and all looks good with this system.
11:02 and 11:06 DAQ restarts due to following changes
The second restart was due to duplicate channels in the DMT broadcast. The number of channels this system handles went from 271 to 854.
EDCU is PURPLE due to Guardian changes, Jamie will produce a new H1EDCU_GRD.ini file when his changes are complete.
h1ecatc1 seemed to be running, but nothing was getting to epics. When I tried to login to PLC2 the PLC control crashed. I restarted the machine, and reran the install scripts, but the PLC control keeps crashing.
We also got the message callBackRequest: cbLow ring buffer fulll
Daniel fixed the problem by reseting each PLC, deleting the target directories, and re running the install scripts. When he did that, the PLC Control were still crashing, at which point he used the restart button in the lower right hand corner to restart the system.
Now things seem to be back.
I burted all three PLCs to 11:00on feb 14th (Friday)
Power down H1LSC to fulfill Work Permit #4446 (remove a DAC card from IO Chassis) and also restart ISC EX model
Working on SR3
Looking at the ELIGO TCS viewport
Passing on a note sent to LHO Operators with regards to the FOMs. If you have suggestions/desires for what we want/removed on these FOMs please let Dave B. or myself know.
Note on FOMs for Operators:
The Wall TV Screens (aka FOMs) have been approaching a state where what we want on them is becoming useful and consistent. As part of a shift task, let's make sure these Screens look good. Once we have a Checksheet, we'll be sure to add checking the FOMs on it.
At 8:30 AM PT, it's been noticed that the PSL ref cav is attempting to lock but keeps dropping out. Sheila D. has been informed.
[Yuta, Rana, Evan]
When Stefan left Friday evening, PRMI wouldn't lock. We poked around at MEDM screens for a while before deciding that a more systematic diagnosis was in order. We decided to attack just the Michelson first.
We parked PRM and misaligned ETMX. We then adjusted the LSC MICH filter bank to duplicate was was done for Kiwamu's and Yuta's previous Michelson lock characterization (elog 9698, 31 Jan 2014). Even with a 1:0 integrator engaged, we found that the Michelson would not lock for more than 30 s, and the error signal drifted by about a third of its peak-to-peak.
We were able to measure the OLTF, and found that it had a UGF of 3 Hz with no phase margin. Rana suggested we notch out the bounce mode of the BS suspension with filters from LLO. We got the filter, adjusted the frequency to the LHO BS (17.8 Hz, as measured from the REFLAIR_A_RF45_Q_ERR spectrum), and then added it to FM6 on LSC_MICH. After doing this, we found that the Michelson lock is much more stable --- it appears to lock indefinitely.
In order to calibrate REFLAIR_A_RF45_Q_ERR in terms of mirror motion, we let the Michelson swing freely and recorded the fringing. We know that the fringing amplitude (in counts) as a function of asymmetry l is A sin(4 pi l / lambda), so the linear portion has a slope of A * 4 pi / lambda, in counts per m. I took the swinging data, trended the minimum, median, and maximum, and then took the median of the trended minimum and maximum values. A histogram of these values is attached. From this I find A = 643 counts; this gives the conversion factor as 7.6 counts per nanometer.
We used this value to get a calibrated spectrum of the dark noise of REFLAIR_A_RF45_Q_ERR, which we measured with the modecleaner unlocked. A trended 10-minute time series is attached; we see that the drift is on the order of a few nanometers over this time period. Also attached is a spectrum of the dark noise, along with Yuta's estimate of the control signal (LSC_MICH_OUT) the Michelson, given in terms of length. The estimated length noise was 1.1 um RMS.
An OLTF of the improved Michelson loop is attached. The UGF is now 7.5 Hz, with a phase margin of 20 degrees. Also attached is Yuta's model of the expected OLTF; the agreeement is excellent around the UGF, except for the flat gain. This model uses already existing an already of the triple suspension of the BS (/ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/TripleModel_Production).
We assumed that the suspension model gives BS actuation efficiency from H1:SUS-BS_M2_LOCK_L_OUTPUT to the actual M3 motion in m/counts. However, there is a missing factor of 1.7e-3 in this actuation efficiency to fit to the measured OLTF.
Written by Yuta
I found that I forgot to put 0.05 in my OLTF model (I forgot that the output matrix H1:LSC-OUTPUT_MTRX for MICH to BS was set to 0.05). I also forgot to put sqrt(2) to convert BS motion to MICH length change. I updated the OLTF figure, and now, the missing factor is 0.024.
Written by Yuta
The missing factor 0.024 was from the conversion factor in uN/counts.
I assumed that the suspension model I use gives me the transfer function in m/counts, but it was actually in m/uN.
The conversion factor can be calculated using the parameters in G1100968 (for BS specific, see T1100479);
0.963 N/A * 0.32 mA/V * 20.0/2**18 V/counts = 2.35e-8 N/counts = 0.024 uN/counts
The OLTF now agrees well with the expected. Thanks to Jeff K. and Arnaud!
(But still, there is a missing factor in the PD signal chain. The measured value 7.6 counts/nm is used in this expected curve. See alog #9630 and #9857)
Note that this factor(uN/counts) is also missing in the current noise budget model which lives in /ligo/svncommon/NbSVN/aligonoisebudget/trunk/PRMI.
The ALS-X BBPD appears to have gone dark around 2:30 PST on Friday. The EX laser IR PD and fiber monitor PDs appear to have been disturbed around the same time, but they have recovered.
Possibly this is related to Friday's work on installing WFS on the ISCTEX table, or the related editing of the X-end simulink models.
The +-18V PD power supply cable for the table was unplugged at the power strip on the field rack. All DC diodes connected to the DC diode interface were down.
Should work now.
Don't know why it was unplugged, it's hard to accidentally plug it off.
I temporarily installed a modal damping filter on the longitudinal degree of freedom of ETMX. The filter has 32 poles, so it is split between two modules, 'md_part1' and 'md_part2'. I plan to measure ringdown times of the test mass tomorrow using the green cavity signal. This is part of an effort to see what are the fastest possible ringdown times of the test mass with top mass damping. After the test I will remove the filters. Normally a modal damping filter wouldn't need this many poles, but I decided to include the pitch dynamics in the estimator to get a more faithful reproduction of the 1st longitudinal mode frequency for this test.
Measured results taken last wednesday. See the attachment. The damping on each mode was set so that each would ring down to 1/e in about 9 seconds. The first page shows the measured and modeled closed loop top mass to top mass transfer function with the longitudinal DOF damped modally. The next 3 pages shows the measured and modeled impulse responses of the UIM, PUM, and testmass respectively. The impulse is injected into the top mass with the test excitations, the measurement is taken with the OSEMs at the UIM and PUM and the green cavity at the test mass. The impulse was set so that it was faster the the highest frequency longitudinal mode. The measurements and model agree quite well. In the ringdowns there is a noticeable phase shift by the end of the 20 seconds because the model has not been fit to the ETMX yet. The cavity measurement also has some extra error becuase the cavity had large drifts and it was difficult to get enough signal without unlocking the cavity.
Same plots but against the new fit of the ETMY model (and this is actually on ETMX). Also included are the number of seconds it takes to get to 1/e of the maximum. I also tweaked the modeled pitch damping filter to make the first pitch mode have similar damping to the measurement. I didn't write down what the actual pitch damping filter is, so this is just a guess. This helps the cavity ringdown match the measurement more precisely. The pitch damping has a non-negligble influence on the cavity ringdown, since the first pitch mode is so close to the first longitudinal mode.
Andres and I are done. We unlocked the suspension, which seems to be free when looking at the L to L TF.