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Revision 331 as of 2018-10-05 18:27:58
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Revision 368 as of 2019-01-18 13:23:52
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Deletions are marked like this. Additions are marked like this.
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==== Report for week of 10/1 ====
===== SR2 =====
 * We solved a mystery with the height of the BF keystone: it turns out that running the table KOACH filters in the tank warms it up (by about 1.5°C) and causes significant sag (700 µm). D'oh!
 * We ran power to the pico drivers.
 * We got the lower section of the SR2 fairly well aligned with just a bit of adjustment with the IM pitch and roll picos.
 * We helped Lucia double-check the geometry of the IP - the current matrix calculation assumes the FRs and the LVDT sensors and actuators are colocated, which is much closer to true than for the BS, but not quite right.
 * We gave up on doing anything more with SR2 for now because we're waiting on extra extension cables for the PI and Fujii-kun will want to borrow one of the geophones next week for a huddle test with new geophones.
===== SRM =====
 * We set the pitch of the SRM and RM, tightened the clamps and removed the winch system.
 * We installed the BF crossbars of the assembly frame and the BF ring section of the security structure.
 * We lifted the IM/... section on the load gauge to find its weight.
 * We craned in the BF and removed the cap.
 * We installed the BF-IRM rods and the IRM top plate.
 * We installed the BF-IM maraging rod and flying saucer cable clamps.
 * We suspended the IM/... section and adjusted the trim masses for balance and total mass. It took quite a lot of adjustment in each of pitch, roll and vertical. The vertical was due to the fact that the weight of the IM/... section is very close to that of SR2/SR3 but the SRM BF is about 0.5 kg weaker. The roll was due to the fact that the default configuration of trim mass had no correction for the horizontal wedge on the optic. However the pitch is a bit of a mystery - nearly all of the removed mass had to come off the AR side. Fortunately we were able to correct for it entirely with masses we had in hand.
 * We routed the TM OSEM cables via the flying saucer up to the underside of the BF.
 * We got 2 power supplies from Shimode-san so we can fire up the SRM rack next week. He will also supply suitable cables to connect the power supplies to the DC power strip in the rack.
 * We received the replated yoke for the SRM top filter.
==== Report for week of 1/14 ====
 * Etc
  * Hirata-san ordered three 41 mm spanners for adjusting the jacks under the top of the tanks.
  * Mirapro installed bellows on the -Y side of BS and the +Y side of SR2.
  * Simon got us an LED, a 2D QPD stage and a second 300x400 mm breadboard, which should be enough to do the SRM TILT OL. He's working on a few more items needed for the LEN OL.
  * Terada-san and Uchiyama-san placed height markers on the SR tank frames showing the BS height and the desired SR heights allowing for 1/300 gradient: SR2 BS+17 mm, SR3 BS+56 mm, and SRM BS+70 mm.
  * Terrence and Mark reworked the Type B Guardian code to simplify future maintenance, so that the scripts `VIS_BS.py` etc are now tiny stub files which call common code in `TYPEB.py`.
  * Mark, Terrence and Enzo updated all the Type B models and MEDM screens to add support for binary output to the stepper driver enable inputs, and Enzo ran cables from the front ends to the BIO adapters, and thence to the drivers. We tested the SRM setup but it doesn't yet work.
 * BS
  * We installed the three new geophones originally prepared for SRM and then realized we'd made a serious mistake: the old wiring used adapters at both ends of the cable to compensate for the flipped preamps in the original geophones, and we forgot to take out the ones at the rack end. So two of the new ones appear to have been damaged and will have to be repaired. VIS has enough preamps to fix all the broken Type B geophones, but Type A will also need some more soon and there aren't enough in total, so we will have to repair them.
  * Hirata-san tried various things including turning the F0 FR carriage upside down to try to fix the jamming problem but it didn't seem to help. After advice from Takahashi-san and further debugging we discovered that we had a half-dead channel on the BS_GAS stepper driver, so we switched to a working channel, and that fixed things.
  * We recalibrated the F0 LVDT, this time measuring the height from the top down as we had been doing for the SRs. We also measured the range of the F0 FR in steps and millimeters and its effect on the keystone.
  * We tuned the IP for frequency and centered it in L, T and Y.
 * SRM
  * Hirata-san checked the F0 yaw stepper and it worked.
  * (CHECK!!) Hirata-san checked the channels on the SRM stepper drivers and found they all worked. However the F0 FR still didn't move, so he tried turning the carriage upside down, and that fixed it. So between the BS and SRM there were two independent causes of the same problem.
  * Fabian surveyed the height of the SRM relative to Terada-san's reference with the GAS filters at nominal height and found it was 3.5 mm low. This is well within the range of the jacks, so we will raise the entire suspension to fix it.
  * Fabian inspected the optic. It seems OK for dust, but there is still some residue left from removing the FC. We may try some more dabbing with acetone.
 * SR2
  * Terrence and Enzo tested the third and last type of collimator (3500 mm) in the OL, but it had much too small a spot and dynamic range. We will standardize on 1.1 mm collimators for all OLs.
  * Fabian inspected the optic and found patterns that may be FC residue on both sides.
 * SR3
  * Fabian and Ohishi-san tried using the Top Gun to remove dust found earlier by Hirose-san. The AR side came clean but the HR did not improve. Fabian wiped the security structure and LBB with Vectra10 wipes and ethanol.
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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 =====
 * Cable/test BF.
 * Install IRM.
 * Install/cable/test IM OSEMs.
 * Suspend/weigh/balance the BF/... section.
==== Plan for week of 1/21 ====
 * Mark in Australia.
 *
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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.
==== Vacation/Etc Info ====
 * Hirata-san at Mitaka Thu 1/31, Fri 2/1.
 * Enzo at Mitaka Fri 2/8.
 * Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.
 * Terrence at Kamioka till 3/29.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 1/14

  • Etc
    • Hirata-san ordered three 41 mm spanners for adjusting the jacks under the top of the tanks.
    • Mirapro installed bellows on the -Y side of BS and the +Y side of SR2.
    • Simon got us an LED, a 2D QPD stage and a second 300x400 mm breadboard, which should be enough to do the SRM TILT OL. He's working on a few more items needed for the LEN OL.
    • Terada-san and Uchiyama-san placed height markers on the SR tank frames showing the BS height and the desired SR heights allowing for 1/300 gradient: SR2 BS+17 mm, SR3 BS+56 mm, and SRM BS+70 mm.
    • Terrence and Mark reworked the Type B Guardian code to simplify future maintenance, so that the scripts VIS_BS.py etc are now tiny stub files which call common code in TYPEB.py.

    • Mark, Terrence and Enzo updated all the Type B models and MEDM screens to add support for binary output to the stepper driver enable inputs, and Enzo ran cables from the front ends to the BIO adapters, and thence to the drivers. We tested the SRM setup but it doesn't yet work.
  • BS
    • We installed the three new geophones originally prepared for SRM and then realized we'd made a serious mistake: the old wiring used adapters at both ends of the cable to compensate for the flipped preamps in the original geophones, and we forgot to take out the ones at the rack end. So two of the new ones appear to have been damaged and will have to be repaired. VIS has enough preamps to fix all the broken Type B geophones, but Type A will also need some more soon and there aren't enough in total, so we will have to repair them.
    • Hirata-san tried various things including turning the F0 FR carriage upside down to try to fix the jamming problem but it didn't seem to help. After advice from Takahashi-san and further debugging we discovered that we had a half-dead channel on the BS_GAS stepper driver, so we switched to a working channel, and that fixed things.
    • We recalibrated the F0 LVDT, this time measuring the height from the top down as we had been doing for the SRs. We also measured the range of the F0 FR in steps and millimeters and its effect on the keystone.
    • We tuned the IP for frequency and centered it in L, T and Y.
  • SRM
    • Hirata-san checked the F0 yaw stepper and it worked.
    • (CHECK!!) Hirata-san checked the channels on the SRM stepper drivers and found they all worked. However the F0 FR still didn't move, so he tried turning the carriage upside down, and that fixed it. So between the BS and SRM there were two independent causes of the same problem.
    • Fabian surveyed the height of the SRM relative to Terada-san's reference with the GAS filters at nominal height and found it was 3.5 mm low. This is well within the range of the jacks, so we will raise the entire suspension to fix it.
    • Fabian inspected the optic. It seems OK for dust, but there is still some residue left from removing the FC. We may try some more dabbing with acetone.
  • SR2
    • Terrence and Enzo tested the third and last type of collimator (3500 mm) in the OL, but it had much too small a spot and dynamic range. We will standardize on 1.1 mm collimators for all OLs.
    • Fabian inspected the optic and found patterns that may be FC residue on both sides.
  • SR3
    • Fabian and Ohishi-san tried using the Top Gun to remove dust found earlier by Hirose-san. The AR side came clean but the HR did not improve. Fabian wiped the security structure and LBB with Vectra10 wipes and ethanol.

Plan for week of 1/21

  • Mark in Australia.

To-Do Lists, Schedule

Vacation/Etc Info

  • Hirata-san at Mitaka Thu 1/31, Fri 2/1.
  • Enzo at Mitaka Fri 2/8.
  • Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.
  • Terrence at Kamioka till 3/29.

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