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Revision 354 as of 2018-12-14 13:45:52
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Revision 402 as of 2019-03-14 19:08:46
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==== Report for week of 11/14 ====
 * SRM
  * We locked the suspension and craned it into the tank. This is the last Type B tank installation!
  * While inspecting the O-ring between the service ring and the lower section of the tank, Hirata-san found a small nick, so he replaced it. (This will hopefully be the last time that flange is closed, so it needs to be left ready for Mirapro to tighten.)
  * Hirata-san and Fabian removed the First Contact, but found that a tiny piece was left behind. With advice from Hirose-san, they managed to remove it via several rounds of dabbing with an acetone-soaked lens tissue.
  * They removed the IM-RM safety bar, unlocked the lower half of the suspension, and got it reasonably well aligned by eye.
  * They moved the vacuum feedthroughs and in-air cabling over, and reconnected nearly all the electronics. (The in-air cabling will need some tidying later, but
 * SR2
  * Enzo worked on diagonalizing the IP and modeling of the whole suspension. He created Foton filters representing the response of the system in slots FM6-8 of the various filter banks.
  * Enzo and Mark set up the the SR2 OL. We may need to steal the LED back temporarily to do pitch setting on SRM, but we can take some interesting TFs on SR2 over the weekend.
 * SR3
  * Enzo configured a new stepper driver for SR3_IP and returned the one that had been borrowed from SRM. (The original SR3_IP had been used to replace a water-damaged unit on the BS.)
 * Etc
  * Mark got three more MPCDs (M = "medium" or "modified") from AEL and moved coil drivers around until all Type B suspensions had a driver in every position, with MPCDs for IM-H and HPCDs everywhere else. He returned the unused LPCDs.
  * Mark did an inventory of all the Type B electronics and got the various JGW Doc electronic items lists up to date - see [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7276|E1707276]]. This included opening all the LVDT drivers to check that they had the original cards - BS, SR3 and SRM did, but SR2 had both input cards new. We let AEL know.
  * Hirata-san helped Furuta-san with floor repair.
  * Fabian changed the PR3 thermometer battery.
  * Mirapro installed a bellows on the -Y side of SR3.
==== 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 the week of 3/11 ====
 * Fabian mostly helped Fujii-kun with the PRM.
 * Fabian monitored the SRM yaw drift. It gradually reversed but so far remained small.
 * Mark and Hirata-san debugged the BS:
  * We inspected the payload section and quickly found the problem: two RM EQ stops were touching, on the +L (-X,+Y) side at the top. This was probably because the stops had been adjusted with the IP unlocked and sitting a few mm to -L, whereas now we have the DCCTRL running and have been locking the IP at the LVDT zero. We drove the IP to L=+1.5 mm as a near-worst case, and backed off all the stops to give several mm of margin. Then we zeroed the IP pitch, roll and yaw with the picos.
  * We also opened the top of the BS and confirmed that the mechanical zero defined by the locking mechanism agreed with the LVDT zero. It was very close in L and T, but -728 µrad in Y, driven mostly by a -805 µm offset in H3. That much is probably not a dumb error but just a difference in technique among the three people using calipers to take data for the calibration.
  * We then prepared the BS for close-up:
   * We wiped and inspected the O-ring for the lid and replaced the lid.
   * We wiped all accessible surfaces in the lower half of the tank, rescued some dropped items (some PEEK tube and a small nut) and un-immobilized the LBB.
  * After all the above, the OL was a bit off-center but still on the QPD, and Nagano-san fairly quickly recovered the original alignment.
 * Terrence rebuilt the BS OL according to a new layout suggested by Simon, which avoids scrambling the pitch/yaw at the first steering mirror and greatly reduces the amount of diagonalization required.
 * Terrence noticed some anomalous cross coupling on the SR2 (but not the SR3) and we investigated.
  * We suspected it might be an odd position of the beam spot on the optic, so we took pictures through the camera and LED viewports of SR3, and opened the SR2 tank and used a white target, but the beam spots were in very similar positions - close to central vertically and about 3 cm to the left of center horizontally.
  * We suspected it might be something touching at the IRM (because the IM OSEM TFs were fine), so we checked using a stick mirror with the IP centered, but all EQ stops were well backed off.
  * We suspected it might be a ghost beam from the LEN/TILT beamsplitter (and one was clearly visible on the SR2 TILT QPD) so Terrence set up a beam block, which improved things slightly but not completely.
  * Finally Terrence discovered that the problem was mainly uneven sensitivities of the QPD quadrants, and devised a new calibration and diagonalization procedure which allowed for it.
 * Enzo and Terrence did a health check of the SRM and it was fine except for some apparent electrical noise around 240 Hz. They put in a notch filter to get rid of it for now.
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==== Plan for week of 12/17 ====
 * Final alignment of SRM payload, plus BF and SF GAS.
 * (Time permitting) unlocking/centering/tuning of IP.
 * Installation of Enomoto-kun's beam target on SRM (if available).
 * Installation/testing of F0 steppers on SR2, SR3, SRM, and (hopefully) final vertical height adjustment.
 * Installation of viewports on SRM.
==== Plan for week of 3/18 ====
 * Mark, Fabian, Terrence at Kamioka full week.
 * More OL stuff.
 * SRM controls and Guardian.
 * Reset SRM yaw and continue monitoring yaw drift.
 * Assist with pump down.
 * Work on Type B paper.
 * Tidy up.
  * Throw out foil and other garbage.
  * Gather and clean tools.
  * Gather and organize unused parts and fasteners.
  * Pull out unused cables in cable tray near SR3.
  * Return all unused cables to tent.
  * Tidy up cables in rear of SR2 rack.
  *
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==== Plan for week of 12/24 ====
 * Most of team on holidays - no Kamioka work.
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==== Vacation/Etc Info ====
 * Mark: 12/24 - 1/4.
 * Hirata-san: 12/24 - 1/4.
 * Fabian: TBD but similar.
 * Enzo: TBD but similar.
 * Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.

==== Vacation/Travel Info ====
 * Enzo at JPS then final vacation, 3/13-29
 * Terrence's last day, 3/29.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for the week of 3/11

  • Fabian mostly helped Fujii-kun with the PRM.
  • Fabian monitored the SRM yaw drift. It gradually reversed but so far remained small.
  • Mark and Hirata-san debugged the BS:
    • We inspected the payload section and quickly found the problem: two RM EQ stops were touching, on the +L (-X,+Y) side at the top. This was probably because the stops had been adjusted with the IP unlocked and sitting a few mm to -L, whereas now we have the DCCTRL running and have been locking the IP at the LVDT zero. We drove the IP to L=+1.5 mm as a near-worst case, and backed off all the stops to give several mm of margin. Then we zeroed the IP pitch, roll and yaw with the picos.
    • We also opened the top of the BS and confirmed that the mechanical zero defined by the locking mechanism agreed with the LVDT zero. It was very close in L and T, but -728 µrad in Y, driven mostly by a -805 µm offset in H3. That much is probably not a dumb error but just a difference in technique among the three people using calipers to take data for the calibration.
    • We then prepared the BS for close-up:
      • We wiped and inspected the O-ring for the lid and replaced the lid.
      • We wiped all accessible surfaces in the lower half of the tank, rescued some dropped items (some PEEK tube and a small nut) and un-immobilized the LBB.
    • After all the above, the OL was a bit off-center but still on the QPD, and Nagano-san fairly quickly recovered the original alignment.
  • Terrence rebuilt the BS OL according to a new layout suggested by Simon, which avoids scrambling the pitch/yaw at the first steering mirror and greatly reduces the amount of diagonalization required.
  • Terrence noticed some anomalous cross coupling on the SR2 (but not the SR3) and we investigated.
    • We suspected it might be an odd position of the beam spot on the optic, so we took pictures through the camera and LED viewports of SR3, and opened the SR2 tank and used a white target, but the beam spots were in very similar positions - close to central vertically and about 3 cm to the left of center horizontally.
    • We suspected it might be something touching at the IRM (because the IM OSEM TFs were fine), so we checked using a stick mirror with the IP centered, but all EQ stops were well backed off.
    • We suspected it might be a ghost beam from the LEN/TILT beamsplitter (and one was clearly visible on the SR2 TILT QPD) so Terrence set up a beam block, which improved things slightly but not completely.
    • Finally Terrence discovered that the problem was mainly uneven sensitivities of the QPD quadrants, and devised a new calibration and diagonalization procedure which allowed for it.
  • Enzo and Terrence did a health check of the SRM and it was fine except for some apparent electrical noise around 240 Hz. They put in a notch filter to get rid of it for now.

Plan for week of 3/18

  • Mark, Fabian, Terrence at Kamioka full week.
  • More OL stuff.
  • SRM controls and Guardian.
  • Reset SRM yaw and continue monitoring yaw drift.
  • Assist with pump down.
  • Work on Type B paper.
  • Tidy up.
    • Throw out foil and other garbage.
    • Gather and clean tools.
    • Gather and organize unused parts and fasteners.
    • Pull out unused cables in cable tray near SR3.
    • Return all unused cables to tent.
    • Tidy up cables in rear of SR2 rack.

Vacation/Travel Info

  • Enzo at JPS then final vacation, 3/13-29
  • Terrence's last day, 3/29.

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