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Report for the week of 2/18 (February 18th) ==== Report for the week 5/20 (written by Fabian) ====
 * Lucia helped Terrence in starting the diagonalization of the SR2 geophones and provided belding filters that Terrence will optimize. (The blending frequency is 0.190 Hz for L,T and 0.260 Hz for Y). 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: it does fulfill the rms displacement and velocity requirements for lock acquisition measured by the oplev. 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.
  * By exciting the pringle mode he balanced the optic coils, measured TFs and tuned the damping filters.
  * The optic residual motion in L, P and Y showed a large peaks close to 0.2 Hz, which is where the micro-seismic may become apparent. This suggested the inertial damping system is not working in a suitable way. As a temporary measure he modified the filters and reduced the gain.
  * At the end measurement of the residual motion reported was carried out with inertial damping only in yaw.
 * Terrence reported an unresponsive SR2 optic coil. We chekced and found the H3 coil cable disconnected.
 * Fabian measured the settings of the SR2 and BS LVDT drivers. See klogs [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8941|8941]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8951|8951]].
 * Fabian helped with the corresponding measurement of one of PR2 LVDT drivers. See klog [[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.
 * Fabian submitted and abstract for the Autumn JPS meeting on September.
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 * On Friday and Saturday last week the pump down of the central area took place. We monitored the drift in the four Type B IPs.
 * During the week we recovered the four suspensions successfully: we recovered the alignment of IMs, GAS filters, IPs, oplevs and measured TFs.
 * Terrence, Enzo and Mark installed the length sensing components in SR2 oplev. It's working now and we should use it now to measure the optic's corresponding TF.
 * The SRM IM is still drifting but the speed is decreasing. Yesterday Thursday the speed was '''-81 nrad/min'''. With the aim of predicting when the drift may stop Terrece removed offsets from the time series segments and spliced them in order. The work is still on progress.
 * Terrence did more work in changing the real-time models.		 ==== 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.
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==== Report for week of 2/12 (February 12th) ====
 * On Saturday we moved the vertical IM OSEMs in order to compensate for a large pitch in the IM introduced when the IR laser as aligned.
  * I took transfer functions over the weekend and the system looks healthy.
  * Although moving the OSEMs was done successfully, I accidentally pulled the cables and moved the flying saucer cable clamp set. I rotated it back judging the position by visual inspection, but an IM yaw drift appeared since then. It's moving with a speed of 0.2 urad/min.
  * On Tuesday we moved the Im back to zero but the drift continued. At the time of writing these lines it is at -833 urad, with H2 and H3 at 93 um and 47 um and still drifting.
 * On Saturday we connected the SRM geophones in-air cables and confirmed we had a signal.
  * However, on Wednesday morning the geophones are not giving any signal. We cheked the master model channel and realized the problem was not the slave model. We suspect a hardware fault.
  * I checked the in-air cables were connected.
 * We released the SRM optical bench and wiped the places where sticky tape was used to fix support blocks.
 * We wiped the SR2 optical bench and security structure. SR3 and SRM had been wiped by Hirose-san, Hirata-san and Fujii-kun.
 * Terrence worked on splitting the real-time models for all the SR suspensions.
 * Today the pumping down of the central area will begin around noon. We will monitor the four inverted pendulums
 * We got rid of the cable reel used in the SR2 rack.		 ==== Report for Golden Week ====
 * Mark monitored vent and pumpdown, and worked on vistools.py.
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==== Report for week of 1/28 ====
 * Etc
  * Mark inventoried lots of items and updated the [[KAGRA/Subgroups/VIS/TypeB/Status|Status]] page.
 * SR2
  * Hirata-san helped with installing the obelisk on the LBB, and added counterweights to get the LBB level and at the right height for the first rough alignment. However the springs were still at or near the top stops, so he later pulled down the LBB with excess mass, locked the blades at the bottom of their range and reset the LBB rods and damping magnet ring, aiming off by 10 mm so that it would be correct when the LBB was allowed to rise to midrange on the blades. He left it pressed down for now so that Hirose-san could apply FC. Early next week he will release it and do the final ballasting.
  * Hirose-san applied and removed FC on both sides of the optic for cleanliness.
  * Mirapro hooked the LBB.
 * SR3
  * Enzo installed IM damping filters.
  * Mark installed a BIO Converter for the stepper remote enable (which will eventually also be used for the WD).
  * Fabian researched buoyancy compensation and pre-applied as much as possible to SR3. The total compensation needed is 0.19 mm for F0, 0.48 mm for SF and 0.46 mm for BF, total 1.23 mm. 1.0 mm had been applied with the jacks. The initial plan was to apply the calculated amounts at each level but then offset F0 1.0 mm lower to undo the jack adjustment. However SF was stuck approximately 1 mm lower than it needed to end up, so the buoyancy correction for it will have to be done at F0, and F0 will end up quite close to nominal.
 * Fabian also offloaded the IM pico yaw adjustment done by Enomoto-kun-tachi to the F0 yaw stepper. This left the OSEMs well-centered, so we will not need to adjust them and the LBB can be released.
 * SRM
  * Enzo fixed the broken triple in-air pico adapter cable and we plugged it back in.
  * Fabian calibrated the F0 FR.
  * Enzo and Terrence installed the arc weights and geophones, tuned and centered the IP, and centered and calibrated the FRs.
  * Mirapro helped us with the camera viewport issue by giving us a gasket of the same type but a different brand from their stock, which snapped easily into place. We then installed the viewport on the tank. Kokeyama-san will help us add the camera and camera LAN cable next week.
  * Simon gave us all the remaining items for the SRM OL except the 3D stage for the LEN QPD.		 ==== 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).
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==== Plan for week of 2/4 ====
 * Mark, Enzo, Fabian, Terrence at Kamioka Mon-Fri.
 * Hirata-san at Kamioka Mon+TBD.
 * Etc
  * Split SR2, SR3 and SRM RT models.
  * Get rid of the power reel behind SRM and plug stuff into the new power point instead.
 * BS
  * Run BNC cables for stepper remote enable, plug into BIO, debug.
 * SR2
  * Do buoyancy correction.
  * Install camera viewport.
  * Install camera.
  * Run BNC cables for stepper remote enable, plug into BIO, debug.
 * SR3
  * Release LBB.
  * Ballast LBB.
  * Install camera viewport.
  * Install camera.
  * Debug stepper remote enable.
 * SRM
  * Install camera.
  * Ballast LBB.
  * Do buoyancy correction.
  * Set up OL.
  * Debug stepper remote enable.		 ==== 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.
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 * Constitution Day, 2/11.
 * Mark and Enzo at KIW in Perugia, 2/12-18.
 * Enzo vacation, 3/5.
 * Enzo et al. Farewell Party, 3/7.
 * Enzo at JPS then final vacation, 3/13-29
 * Terrence's last day, 3/29.		  * 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 5/20 (written by Fabian)

  • Lucia helped Terrence in starting the diagonalization of the SR2 geophones and provided belding filters that Terrence will optimize. (The blending frequency is 0.190 Hz for L,T and 0.260 Hz for Y). See entry 8905.

  • The highlight of the week is Terrence's measurement of the residual motion of the SR2 optic: it does fulfill the rms displacement and velocity requirements for lock acquisition measured by the oplev. 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.
    • By exciting the pringle mode he balanced the optic coils, measured TFs and tuned the damping filters.
    • The optic residual motion in L, P and Y showed a large peaks close to 0.2 Hz, which is where the micro-seismic may become apparent. This suggested the inertial damping system is not working in a suitable way. As a temporary measure he modified the filters and reduced the gain.
    • At the end measurement of the residual motion reported was carried out with inertial damping only in yaw.
  • Terrence reported an unresponsive SR2 optic coil. We chekced and found the H3 coil cable disconnected.

  • Fabian measured the settings of the SR2 and BS LVDT drivers. See klogs 8941 and 8951.

  • Fabian helped with the corresponding measurement of one of PR2 LVDT drivers. See klog 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.
  • 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.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-10-28 10:02:46 by fabian.arellano)