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• VISMinutes20190517

Agenda/Minutes of the VIS Meeting on 2019/5/17

2019/5/17 13:30 - 14:30

Zoom Meeting

Participants:Mark, Takahashi, Terrence, Ishizaki, Fujii, Tanaka, Hirata, Fabian, Shoda, Okutomi, Lucia, Akutsu

Progress report

Schedule Chart

Site work schedule: [[|XLSX]]

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-C: (XLSX)

Type-A (Takahashi)

Past week report

• To match the relative height of ITMX and ITMY, adjusted positions of F2/F3/BF keystone using the FRs. Corrected position was -2.1mm for ITMX and +5.9mm for ITMY respectively.
• The F3 stepping motor in IXV can't work by the rack mount driver.
• The drift of GAS filters due to pump down or cool down was not so large (less than 1mm in total). The effects due to temperature change are still under investigation.

Plan for coming weeks

Type B (Mark)

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 improved the SR2 OL diagonalization and wrote a report JGW-T1910189.

• 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.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

Hardware work for PR2 and PRM.

OMMT & OSTM (Takahashi)

Past week report

• The foot print (200mm) of TAMA-MC suspension is different from one (250mm) of present OSTM suspensiotn.
• The ghost beam shield attached to the suspension frame is required. The ray trace around OSTM is necessary.

Plan for coming weeks

• Ask Sato-san to check the 3D model including the OMC chamber.

VIS electronics (Tanaka)

Past week report

Plan for coming weeks

Other site works

Safety

• Incidents:
• Foreseen risks
  • Type-A:
  • Type-B:

Discussion

• Watchdog

  • Improved Digital Watchdog (Shoda) test.pngconfig.png

    • Almost the same function as the previous WD, but the WD flag is gradually increased so that the outputs would are gradually decreased to zero. However, I found that this system does not have any meaning if DACKILL system works in the current way...
  • Modified hardware WDS for coil open operation (Tanaka)

Travel Plans

• Travel (Week of 5/20):
  • Takahashi:
  • Sato:
  • Mark:
  • Hirata:
  • Shoda:
  • Fujii: 20-24
  • Tanioka:
  • Tanaka:
  • Terrence: 20-24
• Travel (Week of 5/27):
  • Takahashi:
  • Sato:
  • Mark:
  • Hirata:
  • Shoda:
  • Fujii: 28-31
  • Tanioka:
  • Tanaka:

  • Terrence:27-31

• Lucia will be away until July 3rd

Next meeting

On 2019/5/24(Fri)