Agenda/Minutes of the VIS Meeting on 2019/2/15

2019/2/15 13:30 -

Zoom Meeting

Participants:

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

[Y-end]

• Checked the height of filters by the release sensor. The filters were not touching the sensors.
• The F3 keystone was touching the stopper. Adjusted the weight on the BF.
• The motion of BF keystone was very damped. Adjusted the position of secondary coil.
• Adjusted the gain for F0 LVDT in the driver. Calibrated the F0 LVDT.
• Adjusted the phase/gain for IP LVDT in the driver. Calibrated the IP LVDTs.
• Set the height of F0 keystone to -9mm so that the height of BF can be at the nominal posision.
• Released the IP. Each (H1, H2, H3) transfer function and spectrum looked natural.
• Diagonalized transfer functions and spectra showed that the mode L and T are not degenerated (0.07Hz and 0.13Hz).
• Checked inside of the corrugate tube by the long fiber scope. Any problems were not found.

Plan for coming weeks

• Adjustment of the TF, the BF damper, and the IP in X-end (Feb 26-28).

Type B (Mark)

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 started the previously prepared new model tower models for SRM and BS with the new ALIGN filters which is a copy of the TEST filter. The WD threshold for LVDTs and geophones are now separated.
• Terrence worked on splitting the real-time models for the SR2 and SR3. The models worked with the new features now, with DAQ reset in some cases and with help of Miyakawa-san for configuring some DGS related documents (rtcsystab, master, safe.snap, etc).
• Before starting the new models for SR2, Terrence completely shut off SR2 and swapped the power spool with the power strip that was previously prepared.
• Terrence edited the DGS OVERALL screen to show the new SR2 and SR3 models. The TYPE B OVERALL MEDM screen was also modified so taking separate snapshots for the ALIGN and OPTIC ALIGN blocks is available. The corresponding burt request files were also created.
• The corresponding Marco files were also updated to account for the model split and the new DCUIDs. Some mistakes in the Marco files were fixed.
• The Guardian systems for all TYPE B suspensions were all shut off and the suspensions were put in the safe mode manually.
• All Type B Guardian modules are pointing to the generic type B Guardian model (TYPEB.py). It was partially modified for the commissioning next week and Terrence will keep working on it in the afternoon.
• Today the pumping down of the central area will begin around noon. We will monitor the four inverted pendulums

Plan for coming weeks

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

VIS electronics (Tanaka)

Past week report

Plan for coming weeks

Other site works

• Crane inspection: Feb 22nd 11:30 - 12:30

Safety

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

Discussion

Travel Plans

• Travel (Week of 2/18):
  • Takahashi:
  • Okutomi: 18-22
  • Sato:
  • Lucia:
  • Fabian:
  • Mark: 19-22
  • Hirata:
  • Enzo: 19-22
  • Shoda:
  • Ohishi:
  • Fujii: 19-22
  • Tanioka:
  • Tanaka:

  • Terrence:18-22

• Travel (Week of 2/25):
  • Takahashi: 26-28
  • Okutomi:
  • Sato:
  • Lucia:
  • Fabian:
  • Mark: 25-1
  • Hirata:
  • Enzo: 25-1
  • Shoda:
  • Ohishi:
  • Fujii: 25-1
  • Tanioka:
  • Terrence: 25-1

Next meeting

On 2019/2/22(Fri)