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| ==== Report for week of 1/14 ==== * Etc * BS * 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. However 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. * 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. 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. * SRM * 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. * Fabian calibrated the F0 FR. |
==== 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 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 * I wrote lots of comments in Sekiguchi-kun's Matlab scripts. * Fabian submitted and abstract for the Autumn JPS meeting on September. |
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| ==== Report for week of 1/21 ==== ==== BS (top priority) ==== * Last Friday: We tuned the IP to have a lower frequency. At the begginig we measured 78mHz. * Last Friday: With Lucia, we centered the IP and diagonalized the IP. After this process we measured a resonant frequency of 40mHz. We closed the position control loop for the IP. * We checked during the weekend and the suspension was not in a healthy state. We checked the IM horizontal OSEM coil driver, and there were some cables in the wrong connectors. (Test in instead of ...) * The adapter for the cable of the F0 fishing rod was not healtly. We fixed it but it might be good to replace it. * The commissioning team steered the BS IM to reach the Y-end and then Terrence centered the oplev with this orientation (more than once). * Fujii-san and Enzo fixed old BS geophones by replacing the Preamp. * We replaced the Geophones for the recently fixed ones. * Hirata-san and Fabian secured trim masses to the keystone. * We installed GAS Filters and IM control loops * Currently Terrence and Enzo are centering the IP using the horizontal fishing rods. |
==== 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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| ==== SR2 (priority 2) ==== * We measured the optic height. According to the measurement it was 0.1 mm off. However, the systematic error is likely larger (laser level, position of reference). Apparently, the RM has a small amount of roll but this should be investigated further. It might just be systemaric error of the measurement. The roll of IM was adjusted to a value close to zero before the measurement. * We calibrated the F0 fishing rod stepper motor. * We raised suspension using the jacks. We rotated the jacks by 180 degrees roughly.Compensation has to happen with F0, F1 and BF. * We removed tape, writing etc on PI and PI items. * We removed the trim mass. * Terrence restored the OPLEV to the original layout with an 1.1 m collimator and calibrated the tilt sensing QPD. Expect a pitch range of +/-223 urad and a yaw range of +\-322 urad. * We centered the IP by using the jacks. L and T came good but there is a large yaw ~ 5 mrad. * We diagonalized the IP actuation matrix. We closed the position control loop for the IP. '''(This has not happened yet).''' * We installed GAS Filters and IM control loops. '''(This has not happened yet).''' |
==== Report for Golden Week ==== * Mark monitored vent and pumpdown, and worked on vistools.py. |
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| ==== SR3 (priority 2) ==== * The bouyancy correction was calculated. It's 1.3 mm. * The strategy is rasing the suspension by 1.3 mm and then moving the keystone by 1.3 mm with the fishing rod so the alignment team can work. * We measured the optic height using Terada-san's reference. The SR2 optic was at the correct height. * We raised suspension using the jacks by an amount calculated with the jack thread: M42 with 2 mm special thread. We rotated the jacks by approximately 180 degrees. * Terrence reinstalled OL LED, collimator (1.1 m) and relaigned the OL. Both QPDs were calibrated and expect a range of L: $\pm$332 $\mu m$, P: $\pm$217 $\mu rad$ and Y: $\pm$306 $\mu rad$. * OPLEV diagonalization hasn't been done but we expect minimal coupling due to the OPLEV. Strange couplings (due to the geometry of TM) are expected but no conclusive results yet. * We removed tape, writing etc on PI and PI items. * We calibrated the F0 FR against the readout of the F0 LVDT. We removed the trim masses (110 g). Then we moved the F0 keystone by 1.3 mm downwards. * We centered the IP by adjusting the height of the jacks by small amounts. Longitudinal and Transverse positions came good but there was a large yaw (-5 mrad) when the stepper motors were in mid-range. Currently the yaw is -1 mrad and the steppers are using 80% of their range already. * The F0 yaw stepper should, in principle, give plus minus 125 mrad range. We should check with a measurement how good this range is (e.g. cables being pulled, components touching, etc.) We can use the vertical laser level as an oplev or the main interferometer beam * The front of the optic was cleaned by Hirose-san with Hirata-san's help. Hirata-san and Fujii-kun released the optic. '''The IP is still locked.''' * '''F1 fishing rod is not responsive. We have to check the cables.''' * We diagonalized the IP actuation matrix. We closed the position control loop for the IP. '''(This has not happened yet).''' * We installed GAS Filters and IM control loops. '''(This has not happened yet).''' |
==== 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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| '''Talk about problems turning on and off control systems (Terrence and Enzo)''' From Terrence: Since the PI controller was implemented, the controller keeps accumulator displacements error and converts this error to the output. One problem arose from the mismatch of the control system and the actual hardware. Because the controller output could have a much larger value than the number of counts that can be input to the coil actuators (e.g. the controller says we should input 60000 counts to the actuators but the hardware limits the number of counts), the controller will not function as designed. As a result, the PI would shift to one side (due to insufficient driving force) while the voices coils became saturated at maximum output. Additionally, because the controller is still functioning, the integrator keeps accumulating error and hence the output of the controller keeps increasing but the object is actually stuck. This makes the IP very very unstable when the actuators are saturated. | ==== 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. |
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| '''Give status of oplevs (Terrence and Enzo).''' | ==== 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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| ==== SRM (low priority) ==== * Hirose-san, Hirata-san and Fujji-san fixed the RM to the SS and removed the SRM for cleaning. * Terrence installed the optical breadboards on the shelfs for the OPLEV; and, assembled the beamsplitter assembly, lens assembly and the folding mirror assembly. The LED box, collimator and the fibre connected were placed on the lower breadboard and the others are placed on the upper one. Still missing steering mirror to complete a tilt setup and a lens for the length OPLEV. ==== Postponed ==== * Raise suspension 3.5 mm on jacks. * Check/improve payload alignment and IM OSEMs. Recheck optic pitch with OL as needed.\ * Adjust F0 keystone trim to give desired height and secure weights in place. * Install geophones and arc weights. * Center and tune IP. * Hook LBB and add just enough ballast to have it bouncing. * Wipe inside tank with Vectra-Alpha wipes and IPA. * Set up TILT OL. |
==== 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 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 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
- I wrote lots of comments in Sekiguchi-kun's Matlab scripts.
- 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.