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| ==== Report for week of 9/17 ==== * Monday 9/17 was holiday. * We optimized the trim mass on the SF to get more balance torque with less total mass. We now have a reserve of 480 g for the yaw pico. * We set the SF damper gap to 6 mm. * We set the SR2 pitch with the optic lever, aligned the IRM, and set all the OSEMs to have good clearance and midrange output. * We locked the SR2 suspension, craned it into the tank and hooked the LBB damper rings (but not the LBB yet). * With help from Ohishi-san, we removed the First Contact from SR2. * Mark did an audit of all the electronics boxes and updated the item list and S-number file cards on JGWDoc. * Mark added some thin arc weights to the inventory and finalized the number of various types to order (8*38 mm + 9*10 mm). * Panwei copied control filters over from the SR3. ==== Plan for week of 9/24 ==== * Monday 9/24 is holiday (Autumn Equinox). * Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri. ===== SR2 ===== * Move SR2 in-air cables. * Unlock and realign suspension. ===== SRM ===== * Set pitch of SRM and RM, tighten clamps, remove winch system. * Weigh IM/... section. * Build up SS to BF level. * Add BF. * Suspend IM and tweak height/balance. |
==== Report for the week 5/20 ==== * Lucia helped Terrence to set * Last week Akutsu-san suggested to improve the air shield around the oplevs. * 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]]. * We helped with the corresponding measurement of one of PR2 LVDT drivers. See klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8952|8952]]. |
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| ==== Plan for week of 10/1 ==== * Mark, Hirata-san, Fabian, Panwei at Kamioka Mon-Fri. ===== SRM ===== * Cable/test BF. * Install IRM. * Install/cable/test IM OSEMs. |
==== Report for Golden Week ==== * Mark monitored vent and pumpdown, and worked on vistools.py. |
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| ==== Plan for week of 10/8 ==== * Monday 10/8 is Sports Day. * Enzo returns Tuesday 10/9. * Mark and Terrence (plus TBD) at Kamioka Mon-Fri. * Enzo, Hirata-san, Fabian and Panwei at Kamioka Tue-Fri. ===== SR2/SR3 ===== * Terrence to set up LEN half of SR3 OL and, time permitting, TILT and LEN for SR2. ===== SRM ===== * Continue installation. |
==== 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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| ==== 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)]] |
==== 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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| ==== Vacation/Visitor Info ==== * Enzo: 9/15 through 10/8 vacation in Chile. * Terrence: 10/8-12, 10/29-11/2 at Kamioka. |
==== 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 5/20
- Lucia helped Terrence to set
- Last week Akutsu-san suggested to improve the air shield around the oplevs.
- 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.
We helped with the corresponding measurement of one of PR2 LVDT drivers. See klog 8952.
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.