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==== Report for week of 1/14 ==== * Etc * Hirata-san ordered three 41 mm spanners for adjusting the jacks under the top of the tanks. * Mirapro installed bellows on the -Y side of BS and the +Y side of SR2. * Simon got us an LED, a 2D QPD stage and a second 300x400 mm breadboard, which should be enough to do the SRM TILT OL. He's working on a few more items needed for the LEN OL. * Terada-san and Uchiyama-san placed height markers on the SR tank frames showing the BS height and the desired SR heights allowing for 1/300 gradient: SR2 BS+17 mm, SR3 BS+56 mm, and SRM BS+70 mm. * Terrence and Mark reworked the Type B Guardian code to simplify future maintenance, so that the scripts `VIS_BS.py` etc are now tiny stub files which call common code in `TYPEB.py`. * Mark, Terrence and Enzo updated all the Type B models and MEDM screens to add support for binary output to the stepper driver enable inputs, and Enzo ran cables from the front ends to the BIO adapters, and thence to the drivers. We tested the SRM setup but it doesn't yet work. * BS * We installed the three new geophones originally prepared for SRM and then realized we'd made a serious mistake: the old wiring used adapters at both ends of the cable to compensate for the flipped preamps in the original geophones, and we forgot to take out the ones at the rack end. So two of the new ones appear to have been damaged and will have to be repaired. VIS has enough preamps to fix all the broken Type B geophones, but Type A will also need some more soon and there aren't enough in total, so we will have to repair them. * Hirata-san tried various things including turning the F0 FR carriage upside down to try to fix the jamming problem but it didn't seem to help. After advice from Takahashi-san and further debugging we discovered that we had a half-dead channel on the BS_GAS stepper driver, so we switched to a working channel, and that fixed things. * We recalibrated the F0 LVDT, this time measuring the height from the top down as we had been doing for the SRs. We also measured the range of the F0 FR in steps and millimeters and its effect on the keystone. * We tuned the IP for frequency and centered it in L, T and Y. * SRM * Hirata-san checked the F0 yaw stepper and it worked. * (CHECK!!) Hirata-san checked the channels on the SRM stepper drivers and found they all worked. However the F0 FR still didn't move, so he tried turning the carriage upside down, and that fixed it. So between the BS and SRM there were two independent causes of the same problem. * Fabian surveyed the height of the SRM relative to Terada-san's reference with the GAS filters at nominal height and found it was 3.5 mm low. This is well within the range of the jacks, so we will raise the entire suspension to fix it. * Fabian inspected the optic. It seems OK for dust, but there is still some residue left from removing the FC. We may try some more dabbing with acetone. * SR2 * Terrence and Enzo tested the third and last type of collimator (3500 mm) in the OL, but it had much too small a spot and dynamic range. We will standardize on 1.1 mm collimators for all OLs. * Fabian inspected the optic and found patterns that may be FC residue on both sides. * SR3 * Fabian and Ohishi-san tried using the Top Gun to remove dust found earlier by Hirose-san. The AR side came clean but the HR did not improve. Fabian wiped the security structure and LBB with Vectra10 wipes and ethanol. |
==== Report for the week 6/3 ==== ===== Inertial Damping and Residual Motion Stuff ===== * See Klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9064|9064]] * SRM IP L and T is blended at ~110 mHz while IP Y is blended at 260 mHz (Lucia's old filter). The stability test was carried over the past weekend with inertial damping and all other stages on. The system seems stable. * To study to performance of the inertial damping, I improvised an OL windshield for SRM. * Another round of diagonalization was carried just because we have better sensitivity. * With IP LVDT damping and other controls on, the residual motion is as follows: |
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==== Plan for week of 1/21 ==== * Mark in Australia. * ==== To-Do Lists, Schedule ==== * [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoSR]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]] |
RMS Displacement: || || Requirement || Result || || L || 0.4 µm || 0.1076 µm || || P || 1 µrad || 0.0569 µrad || || Y || 1 µrad || 0.0598 µrad || |
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==== Vacation/Etc Info ==== * Hirata-san at Mitaka Thu 1/31, Fri 2/1. * Enzo at Mitaka Fri 2/8. * Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16. * Terrence at Kamioka till 3/29. |
RMS Velocity: || || Requirement || Result || || L || 0.5 µm || 0.1014 µm/s || || P || / || 0.2165 µrad/s || || Y || / || 0.1776 µrad/s || * I measured the residual motion with inertial damping, inertial damping without LVDT DC, normal damping without LVDT DC. Results are pretty similar. === Type B (Mark) === ==== Report for the week 5/27 (written by Fabian) ==== * Shoda-san implemented the moderate watchdog: when tripping the amount of actuation will ramp down to zero smoothly. Klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9009|9009]]. * Terrence updated the BS guardian. * Terrence designed a VIS status monitor. The font might be too small for some people. * Terrence worked on SRM inertial damping. * There is coherence between the geophones and LVDTs at 0.1 Hz. * He designed a filter with a blending frequency of 0.110 Hz. * The system seems stable. * For SR2 Fabian calculated the sensor noise fed back into the system by the control loop: entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8979|8979]]. * The GAS filters' contrbution is too high. * I asked Enzo and he didn't rolled off the filters at higher frequecies. * Filter modification was assigned to Fabian. * Fabian and Yokozawa-san measured the settings of the SR3 LVDT driver. Klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9025|9025]]. * In the weekly comissioning meeting Fabian made the commitment of writing a list of the measurements we want to do with the DRMI for Type B characterization.I will write it by next week and send it around for comnents. === Type B (Mark) === ==== Report for the week 5/20 (written by Fabian) ==== * Terrence implemented a filter for the inertial damping. See entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8905|8905]]. * The highlight of the week is Terrence's measurement of the residual motion of the SR2 optic: as measured by the oplev, it does fulfill the RMS displacement and velocity requirements for lock acquisition and, partially, for the observation mode also. See the report at klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8949|8949]]. * The integrated RMS was calculated from 5 Hz to DC because there are some peaks between 8 Hz and 10 Hz and whose origin still has to be clarified. See the report at entries [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8918|8918]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8933|8933]]. * After Akutsu-san's suggestion Terrence improved the air shield in two rounds, including a cylindrical cover around the viewport. This reduced the noise by about a factor of 10. * He realized setting up the shield may have slightly changed something in the oplev and carried out another round of diagonalization. * He realized the H3 coil was not working. We fixed it.A cable was disconnected. * The optic residual motion in L showed a large peaks close to 0.2 Hz, which is where the micro-seismic may become apparent. The peak was not seen in P or Y. The inertial damping system is likely not working in a suitable way. The blending frequency is 0.190 Hz which may not be low enough. * At the end measurement of the residual motion reported was carried out with inertial damping only in yaw. * Fabian, Terrence and Fujii-kun measured the settings of the SR2, BS LVDT drivers and one of SR2's. See klogs [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8941|8941]] , [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8951|8951]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8952|8952]]. * Fabian worked more on the calculation of the amount of sensor noise injected: * I imported Panwei's OSEM noise measurements and calculated the virtual sensor noise. * I imported Fujii-kun's measuement of the geophone noise and calculated the virtual sensor noise. * I imported the blending filter * I wrote lots of comments in Sekiguchi-kun's Matlab scripts. * I will write a klog soon with preliminar results. * Fabian submitted and abstract for the Autumn JPS meeting on September. ==== Plan for the week 5/25 ==== * Terrence will work in the optimization of the inertial damping. * Fabian will continue with the calculation and prepare a presentation for the conference in Brazil. ==== Report for Golden Week ==== * Mark monitored vent and pumpdown, and worked on vistools.py. ==== Report for the week of 5/6 ==== * Lucia and Terrence got the blending working for the IP LVDTs and geophones. * Terrence and Mark modified the models and MEDM screens to add a new IP block, IDAMP, for damping using the blended signal with inertial information, and a new DAMPMODE block for ramping smoothly between IDAMP and the old DAMP. * Mark worked on vistools.py, improving the support for cdsMuxMatrix blocks (e.g., OSEM2EUL) and adding support for cdsRampMuxMatrix blocks (e.g., the newly introduced DAMPMODE). He also created two sets of unit tests, unittest.py and unittest.sh, for the two modes of use (as a Python module in other Python programs, and as a command-line utility in bash). ==== Report for week of 5/13 ==== * Terrence measured Q's for nearly all modes on SR2 from TFs and then did some ring-down tests to get a better estimate of some high-Q modes. * Terrence and Mark looked at the velocity and angular velocity noise of the SR2 as reported by the LEN and TILT OLs. * The Y signal was fairly clean and the Y RMS angular velocity requirement was met. However the L signal was quite noisy, and was also contaminating the P signal due to the large cross terms in the diagonalization matrix. The RMS L from 5 Hz down with damping on was around 10 µm/s, which is 10 times the requirement. However little of this was due to pendulum resonances - most of the noise was featureless and broadband. In displacement units the noise was flat up to about 1 Hz and then smoothly rolled off to f^-2. The noise in the raw P and Y signals (not yet divided by the sum) was about 10 times the noise in the SUM. * We tried improving the noise with different whitening settings. Increasing the overall gain, increasing it at the QPD but reducing it at the whitening filter, and switching off the 1-10Hz boost whitening filter (and compensating software filter) had no effect. Blocking the beam reduced the noise by about 2 orders and brought the raw P and Y in line with the SUM, suggesting that the problem was before the QPD. Akutsu-san says the noise spectrum looks like it may be limited by air currents, and we probably need better wind shielding. * Mark swapped in an improved version of `vistools.py`, debugged a few small issues, and simplified the `TYPEB.py` Guardian. * Fabian embarked on a project to calculate the residual motion within KAGRA's observation band (beginning at 10 Hz) to make sure The Type B suspension fulfills the requirement, and calculate the speed of the optic to make sure we can acquire the lock. * He modified Takanori's Simulink/Matlab simulation in order to include the length sensing oplev and its control feedback path. * He imported Enzo's IM/GAS/IP-LVDT filters into the simulation. * He imported into the simulation the measured LVDT floor noise (sensitivities). * He calculated the IP-L, IP-T and IP-Y sensitivities. ==== Plan for week of 5/20 ==== * Mark at Mitaka Mon, Tue; US from Wed till 6/11. * Fabian * Import Panwei's OSEM sensitivity measurements and calculate the sensitivity of the virtual IM sensors. * Import geophones sensitivities and calculate the sensitivity of the corresponding virtual sensors. * Import Licia's and Terrence's inertial sensing filters. * Terrence * Try to reduce the OL noise and get better estimates of the RMS velocity with damping on. ==== Vacation/Travel Info ==== * Terrence's next visit from 4/18 to 7/27. * Mark's US vacation from 5/22 to 6/11. * Fabian at conference in Brazil from 5/31 to 6/17. * Mark's final day 6/28. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for the week 6/3
Inertial Damping and Residual Motion Stuff
See Klog 9064
- SRM IP L and T is blended at ~110 mHz while IP Y is blended at 260 mHz (Lucia's old filter). The stability test was carried over the past weekend with inertial damping and all other stages on. The system seems stable.
- To study to performance of the inertial damping, I improvised an OL windshield for SRM.
- Another round of diagonalization was carried just because we have better sensitivity.
- With IP LVDT damping and other controls on, the residual motion is as follows:
RMS Displacement:
|
Requirement |
Result |
L |
0.4 µm |
0.1076 µm |
P |
1 µrad |
0.0569 µrad |
Y |
1 µrad |
0.0598 µrad |
RMS Velocity:
|
Requirement |
Result |
L |
0.5 µm |
0.1014 µm/s |
P |
/ |
0.2165 µrad/s |
Y |
/ |
0.1776 µrad/s |
* I measured the residual motion with inertial damping, inertial damping without LVDT DC, normal damping without LVDT DC. Results are pretty similar.
Type B (Mark)
Report for the week 5/27 (written by Fabian)
Shoda-san implemented the moderate watchdog: when tripping the amount of actuation will ramp down to zero smoothly. Klog entry 9009.
- Terrence updated the BS guardian.
- Terrence designed a VIS status monitor. The font might be too small for some people.
- Terrence worked on SRM inertial damping.
- There is coherence between the geophones and LVDTs at 0.1 Hz.
- He designed a filter with a blending frequency of 0.110 Hz.
- The system seems stable.
For SR2 Fabian calculated the sensor noise fed back into the system by the control loop: entry 8979.
- The GAS filters' contrbution is too high.
- I asked Enzo and he didn't rolled off the filters at higher frequecies.
- Filter modification was assigned to Fabian.
Fabian and Yokozawa-san measured the settings of the SR3 LVDT driver. Klog entry 9025.
- In the weekly comissioning meeting Fabian made the commitment of writing a list of the measurements we want to do with the DRMI for Type B characterization.I will write it by next week and send it around for comnents.
Type B (Mark)
Report for the week 5/20 (written by Fabian)
Terrence implemented a filter for the inertial damping. See entry 8905.
The highlight of the week is Terrence's measurement of the residual motion of the SR2 optic: as measured by the oplev, it does fulfill the RMS displacement and velocity requirements for lock acquisition and, partially, for the observation mode also. See the report at klog entry 8949.
The integrated RMS was calculated from 5 Hz to DC because there are some peaks between 8 Hz and 10 Hz and whose origin still has to be clarified. See the report at entries 8918 and 8933.
- After Akutsu-san's suggestion Terrence improved the air shield in two rounds, including a cylindrical cover around the viewport. This reduced the noise by about a factor of 10.
- He realized setting up the shield may have slightly changed something in the oplev and carried out another round of diagonalization.
- He realized the H3 coil was not working. We fixed it.A cable was disconnected.
- The optic residual motion in L showed a large peaks close to 0.2 Hz, which is where the micro-seismic may become apparent. The peak was not seen in P or Y. The inertial damping system is likely not working in a suitable way. The blending frequency is 0.190 Hz which may not be low enough.
- At the end measurement of the residual motion reported was carried out with inertial damping only in yaw.
Fabian, Terrence and Fujii-kun measured the settings of the SR2, BS LVDT drivers and one of SR2's. See klogs 8941 , 8951 and 8952.
- Fabian worked more on the calculation of the amount of sensor noise injected:
- I imported Panwei's OSEM noise measurements and calculated the virtual sensor noise.
- I imported Fujii-kun's measuement of the geophone noise and calculated the virtual sensor noise.
- I imported the blending filter
- I wrote lots of comments in Sekiguchi-kun's Matlab scripts.
- I will write a klog soon with preliminar results.
- Fabian submitted and abstract for the Autumn JPS meeting on September.
Plan for the week 5/25
- Terrence will work in the optimization of the inertial damping.
- Fabian will continue with the calculation and prepare a presentation for the conference in Brazil.
Report for Golden Week
- Mark monitored vent and pumpdown, and worked on vistools.py.
Report for the week of 5/6
- Lucia and Terrence got the blending working for the IP LVDTs and geophones.
- Terrence and Mark modified the models and MEDM screens to add a new IP block, IDAMP, for damping using the blended signal with inertial information, and a new DAMPMODE block for ramping smoothly between IDAMP and the old DAMP.
- Mark worked on vistools.py, improving the support for cdsMuxMatrix blocks (e.g., OSEM2EUL) and adding support for cdsRampMuxMatrix blocks (e.g., the newly introduced DAMPMODE). He also created two sets of unit tests, unittest.py and unittest.sh, for the two modes of use (as a Python module in other Python programs, and as a command-line utility in bash).
Report for week of 5/13
- Terrence measured Q's for nearly all modes on SR2 from TFs and then did some ring-down tests to get a better estimate of some high-Q modes.
- Terrence and Mark looked at the velocity and angular velocity noise of the SR2 as reported by the LEN and TILT OLs.
- The Y signal was fairly clean and the Y RMS angular velocity requirement was met. However the L signal was quite noisy, and was also contaminating the P signal due to the large cross terms in the diagonalization matrix. The RMS L from 5 Hz down with damping on was around 10 µm/s, which is 10 times the requirement. However little of this was due to pendulum resonances - most of the noise was featureless and broadband. In displacement units the noise was flat up to about 1 Hz and then smoothly rolled off to f^-2. The noise in the raw P and Y signals (not yet divided by the sum) was about 10 times the noise in the SUM.
- We tried improving the noise with different whitening settings. Increasing the overall gain, increasing it at the QPD but reducing it at the whitening filter, and switching off the 1-10Hz boost whitening filter (and compensating software filter) had no effect. Blocking the beam reduced the noise by about 2 orders and brought the raw P and Y in line with the SUM, suggesting that the problem was before the QPD. Akutsu-san says the noise spectrum looks like it may be limited by air currents, and we probably need better wind shielding.
Mark swapped in an improved version of vistools.py, debugged a few small issues, and simplified the TYPEB.py Guardian.
- Fabian embarked on a project to calculate the residual motion within KAGRA's observation band (beginning at 10 Hz) to make sure The Type B suspension fulfills the requirement, and calculate the speed of the optic to make sure we can acquire the lock.
- He modified Takanori's Simulink/Matlab simulation in order to include the length sensing oplev and its control feedback path.
- He imported Enzo's IM/GAS/IP-LVDT filters into the simulation.
- He imported into the simulation the measured LVDT floor noise (sensitivities).
- He calculated the IP-L, IP-T and IP-Y sensitivities.
Plan for week of 5/20
- Mark at Mitaka Mon, Tue; US from Wed till 6/11.
- Fabian
- Import Panwei's OSEM sensitivity measurements and calculate the sensitivity of the virtual IM sensors.
- Import geophones sensitivities and calculate the sensitivity of the corresponding virtual sensors.
- Import Licia's and Terrence's inertial sensing filters.
- Terrence
- Try to reduce the OL noise and get better estimates of the RMS velocity with damping on.
Vacation/Travel Info
- Terrence's next visit from 4/18 to 7/27.
- Mark's US vacation from 5/22 to 6/11.
- Fabian at conference in Brazil from 5/31 to 6/17.
- Mark's final day 6/28.