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==== Report for week of 10/15 ====
===== SRM =====
 * We received the fourth feedthrough we had been waiting for and installed it on the AF.
 * Fabian added the cables between the FE computer and the ADC/DAC boxes, and we checked that we were getting IO in the real-time model.
 * Fabian and Enzo connected up the Sat Amps.
 * Fabian double-checked the optic pitch, got the IRM nicely aligned to the IM, cabled IM OSEMs V1, V2, V3 and H1, and adjusted those OSEMs in/out to midrange.
 * Hirata-san set the compression on the F0 to 30 mm and measured the height and frequency as a function of load. He then fixed a loose screw on one of the blade tips and repeated the measurement. The frequency was fairly constant at around 0.5, which will do. He did a mass budget and chose a F1 CuBe spring. We may do a tiny bit more compression if the frequency degrades, and/or choose an even stronger spring if the load capacity is not enough.
 * Hirata-san took apart and reassembled one of the LBB blade units, which had a badly seated blade.
 * Hirata-san put cable clamps on the SF and on the PI. We are very short on the PEEK clamp pieces, so he scavenged some from SR2.
 * We added a new LAN hub for SRM, and configured two stepper drivers as SRM_IP and SRM_GAS.
 * Late in the week we received extra Type 3-4 cables (thanks to Sato-san for expediting) and were able to cable IM OSEMs H2 and H3, and the BF LVDT.
 * Enzo made a new batch of feedthrough adapters.
===== SR2 =====
 * We finalized the geophone cabling and reinstalled the geophones.
 * We received the new arc weights, and used some of them to install a basic allotment of 6 38-mm weights on SR3 per the CAD. We then added two extra 19-mm arc weights for tuning and got a good IP frequency of 0.133 Hz.
 * Apart from the F0 yaw stepper issue and the OL, the SR2 is now more-or-less complete and adjusted mechanically, and just needs software work (control loops etc). We will however have to borrow one of the geophones at some point to do a huddle test with the final batch of new geophones (including those for SRM). Terrence can set up the OL in the week of 10/29.
==== Plan for week of 10/22 ====
 * Friday is NAOJ Open Day Prep - no Kamioka work.
 * Mark and Fabian at Kamioka Mon-Thu.
 * Enzo and Hirata-san at Kamioka Tue-Thu.
===== SR2 =====
 * Do a measurement of how much torque is required on the F0 keystone to move the system in yaw. (This will help Sato-san choose a suitable stepper driver for the new design.)
 * Continue shakedown.
 * Gather parts for the OL (with help from Simon).
===== SRM =====
 * Scavenge HPCDs from SR2 and SR3 (currently we only have one for SRM) and organize to get LPCDs modified.
 * Suspend/weigh/balance the BF/... section.
 * Build up the AF and SS to the SF level.
 * Install the SF.
==== Plan for week of 10/29 ====
 * Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri.
===== SR2 =====
 * Set up OL.
===== SRM =====
 * Continue assembly.
==== 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.
 *
Line 46: Line 38:
==== Vacation/Visitor Info ====
 * Terrence: 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)