Differences between revisions 410 and 418 (spanning 8 versions)
⇤ ← Revision 410 as of 2019-04-12 13:06:09 →
Size: 2314
Editor: MarkBarton
Comment:
← Revision 418 as of 2019-05-23 11:03:52 → ⇥
Size: 4396
Editor: fabian.arellano
Comment:
Deletions are marked like this. Additions are marked like this.
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==== Report for the week of 4/8 ====
 * Support of Type Bp
  * Mark made lots of Guardian improvements:
   * Used Guardian's timer functionality to drastically reduce the number of notifications during ramping.
   * Added new requestable states DCCTRL_ONLY and NEUTRAL (and associated transitional states) to facilitate testing.
   * Tidied up the code to use tabs consistently throughout for indentation.
   * Disabled the test for the IM-H coil driver WD (to work around the fact that only the relay in the chassis has been disabled, not the WD signals going to the BIO).
 * We opened the BS tank lid and offloaded a large IM-Y offset to F0-Y with manual adjustment of the broken yaw mechanism).
 * We opened the SR2 side doors and adjusted the V1 OSEM to mid-range.
 * Mark offloaded a large SR2 IM-Y offset to F0-Y.
 * Mark did health checks for BS, SR2 and SR3.
 * Fabian offloaded yaw from SRM and did the SRM health check.
 * Fabian updated the Python code for the stepper driver MEDM screen to reflect that two stepper drivers have different mappings to work around dead channels.
 * Fabian monitored pumpdown on Friday afternoon and will continue on Saturday.		 ==== 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 4/15 ====
 * Mark, Hirata-san at Kamioka Tue-Thu.
 * Fabian at Kamioka Mon-Wed.
 * All at f2f Meeting 4/19-21.
 * Post-pumpdown health checks.
 * Teach Hirata-san about the computer systems and control theory.
 * Work with Lucia to do blending of the IP LVDTs and geophones.
 * More Guardian improvements.
  * Update vistools.py (formerly LIGO sustools.py) for Type B and KAGRA, and have the TYPEB.py Guardian use it where appropriate.
  * Modify RT models and/or Guardian to revert to the SAFE state under control in all but the most extreme emergency situations (rather than suddenly shutting off all output).
 * Work on Type B paper.
 * Tidy up.
  * Gather and clean tools.
  * Gather and organize unused parts and fasteners.		 ==== 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.
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 * Mark at Mitaka 4/15.
 * f2f 4/19 (Friday), 4/20, 4/21.
 * Terrence's next visit from 4/18.
 * Fabian's vacation 4/26 to 5/10.		  * Terrence's next visit from 4/18 to 7/27.
Line 41: Line 44:
 * Fabian at conference in Brazil from 5/31 to 6/17.

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.

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