Differences between revisions 298 and 301 (spanning 3 versions)
Revision 298 as of 2018-06-22 13:35:18
Size: 3497
Editor: MarkBarton
Comment:
Revision 301 as of 2018-07-06 14:10:34
Size: 3541
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
Line 6: Line 6:
==== Report for week of 6/18 ====
 * Mark checked the health of the suspensions after an earthquake on Monday morning. The BS watchdog tripped and there was a few µrad change in the pointing, but otherwise it was fine. SR3 and SR2 were also fine.
 * Mark, Enzo and Terrence finalized the trim mass on the BF to set the SF keystone height and BF pitch/roll.
 * They weighed the SF/... section. With no internal trim mass in the SF but with the flying saucer and rod, but with 2 Promec masses for rough balance, it was 255.4 kg, so allowing 1 kg for cables and fine trim mass, we would like a PI load capacity of 256.4 kg.
 * Enzo and Terrence cabled and tested the SF fishing rod, and reversed the connections on the SF LVDT actuation to bring it to standard polarity.
 * Mark and Enzo made many improvements to the Type B MEDM screens.
 * Enzo and Mark measured the BF and SF bounce frequencies (with the other keystone locked).
 * Enzo replaced a HPCD that seemed to have failed during the bounce test (but had just had a watchdog trip), and then replaced the replacement, which really did fail. It turns out we need to avoid applying more than about 25000 counts of GAS actuation.
 * Enzo offloaded the BF LVDT actuator with the BF FR to remove the need for a 10000 ct offset.
 * Hirata-san and Kozu-kun struggled to tune the top filter for SR3 - see klogs 5310, 5324, 5337, xxxx. At first the results were somewhat unrepeatable, with high frequency and low load capacity. This was improved by using a torque wrench (set to 50 N.m) to tighten the blade base clamp screws, retightening the blade tip screws (which had worked loose) and tightening the collar on the end of the shaft of the magic wand. Eventually we decided on a compression of 30 mm, which should give a frequency of around 0.5 Hz if we remove one Cu damper segment from the SF. Hirata-san applied the 30 mm compression but we skipped another round of testing with the dummy load and will go straight to hanging the SF/... section on the assembly frame.
 * We wrapped PI #1 (for SR2) and craned it from behind SR3 to behind SRM. We can now wrap PI #3 (for SR3) and crane it straight to the assembly frame.
 
==== Plan for week of 6/25 ====
 * Mark, Enzo, Hirata-san, Terrence at Kamioka Mon-Fri.
 * Kozu-kun at Kamioka except Thu.
==== Report for week of 7/2 ====
 * We double-checked the bounce frequency and it was indeed around 0.5 Hz with the CuBe auxiliary spring installed.
 * We prepared (but did not yet install) 6 arc weights for tuning the IP.
 * We unlocked the security structure from the assembly frame, and raised the whole system on the top jacks. We then unlocked the IP and adjusted the leveling so the IP was centered. We then had to loosen two of the poles at the top level of the security structure to make it vertical again, because it turns out that the jack receptacles (which also serve as the IP leg bases) are welded at very uneven depths in the bottom surface of the PI, so the IP and the bottom surface can't be level at once.
 * We debugged an issue with the height of the payload. It turns out that due to a buildup of errors (especially an extra 3 mm between the SF and BF), the payload is some 5-6 mm low with the F0 keystone at CAD height. Since the frequency is roughly independent of height around 0.5 Hz, we decided to go with a higher F0 keystone.
 * Enzo and Eleonora routed all the SF/... cables up to the PI.
 * We found we needed 4.7 kg of extra mass to get the desired keystone height, so we decided to put the third Cu segment (3.3 kg) back on, purely as ballast.
 * We put some extra small masses on the SF cap to level it. The suspension is now fully ballasted and trimmed except for 1 Promec mass (455 g) standing in for the new PI yaw stepper motor assembly (estimated 330 g) which is yet to arrive.
 * We took all the SR sat amps back to Mozumi to get new capacitors installed, and grabbed three spares for use while that is being done.
 * We investigated and documented Tanaka-san's watchdog for the BS, to see if the BIO Converter chassis that it uses could also drive reset lines for stepper motor driver boxes.
 * Hirata-san and Terrence characterized the last 4 F0 blades.
 * Hirata-san and Terrence installed blades in the top filter for SR2 and tuned it to 0.5 Hz (with the CuBe auxiliary spring) over three rounds of compression.


==== Plan for week of 7/9 ====
 * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
Line 22: Line 23:
 * Shutdown Type B controls (as far as possible) in preparation for risk of accidental power outage during electrical work on 6/26.
 * Prepare SF damper magnet ring and rods.
 * Install PI #3 in SR3 AF.
 * Suspend SF/... section.
 * Lots of cable routing and testing.
 * Move PI #1 (for SR2) over SRM tank to work area, install blades and tune.
===== Main Sequence =====
 * Check/restore alignment of payload, especially optic pitch.
 * Install and cable geophones.
 * Install arc weights.
 * Tune IP.
 * Install, cable PI yaw stepper.
 * Make three in-air stepper splitter cables for SR2, SR3 and SRM.
 * Calibrate PI LVDTs and FRs.
 * Cabling, testing, TFs.
Line 29: Line 33:
==== Plan for week of 7/2 ====
 * Mark, Hirata-san, Terrence at Kamioka Mon-Fri.
 * Enzo at Kamioka Mon-Wed.
 * Kozu-kun at Kamioka except Wed.
 * --
===== F0/LBB Stuff ====
 * Finalize PI #1 for SR2; crane into SR2 cleanbooth.
 * Remove SR3 tank lid, crane LBB rings to top of lower half of the tank, clamp in position.
 * Set tank jacks to nominal height.
 * Clear space for PI #2 (SRM) work.

=== Plan for week of 7/16 ===
===== Main Sequence =====
Line 35: Line 42:
 * Remove tank lid and raise LBB damper rings.
 * Crane suspension into tank.
 * Crane into tank.
 * Unlock suspension.
 * Rearrange cables.
 * Test.
===== F0/LBB Stuff =====
 * Install correct IP in PI #2.
 * Crane PI #2 to second floor.
 * Rebuild top filter of PI #2.
Line 44: Line 57:
 * Kozu-kun: 7/4 Tokyo.
 * Enzo: 7/5-6 NAOJ Party, Mitaka.
Line 47: Line 58:
 * Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.  * Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 7/2

  • We double-checked the bounce frequency and it was indeed around 0.5 Hz with the CuBe auxiliary spring installed.

  • We prepared (but did not yet install) 6 arc weights for tuning the IP.
  • We unlocked the security structure from the assembly frame, and raised the whole system on the top jacks. We then unlocked the IP and adjusted the leveling so the IP was centered. We then had to loosen two of the poles at the top level of the security structure to make it vertical again, because it turns out that the jack receptacles (which also serve as the IP leg bases) are welded at very uneven depths in the bottom surface of the PI, so the IP and the bottom surface can't be level at once.
  • We debugged an issue with the height of the payload. It turns out that due to a buildup of errors (especially an extra 3 mm between the SF and BF), the payload is some 5-6 mm low with the F0 keystone at CAD height. Since the frequency is roughly independent of height around 0.5 Hz, we decided to go with a higher F0 keystone.
  • Enzo and Eleonora routed all the SF/... cables up to the PI.
  • We found we needed 4.7 kg of extra mass to get the desired keystone height, so we decided to put the third Cu segment (3.3 kg) back on, purely as ballast.
  • We put some extra small masses on the SF cap to level it. The suspension is now fully ballasted and trimmed except for 1 Promec mass (455 g) standing in for the new PI yaw stepper motor assembly (estimated 330 g) which is yet to arrive.
  • We took all the SR sat amps back to Mozumi to get new capacitors installed, and grabbed three spares for use while that is being done.
  • We investigated and documented Tanaka-san's watchdog for the BS, to see if the BIO Converter chassis that it uses could also drive reset lines for stepper motor driver boxes.
  • Hirata-san and Terrence characterized the last 4 F0 blades.
  • Hirata-san and Terrence installed blades in the top filter for SR2 and tuned it to 0.5 Hz (with the CuBe auxiliary spring) over three rounds of compression.

Plan for week of 7/9

  • Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
  • --

Main Sequence
  • Check/restore alignment of payload, especially optic pitch.
  • Install and cable geophones.
  • Install arc weights.
  • Tune IP.
  • Install, cable PI yaw stepper.
  • Make three in-air stepper splitter cables for SR2, SR3 and SRM.
  • Calibrate PI LVDTs and FRs.
  • Cabling, testing, TFs.

===== F0/LBB Stuff ====

  • Finalize PI #1 for SR2; crane into SR2 cleanbooth.
  • Remove SR3 tank lid, crane LBB rings to top of lower half of the tank, clamp in position.
  • Set tank jacks to nominal height.
  • Clear space for PI #2 (SRM) work.

Plan for week of 7/16

Main Sequence
  • Lock suspension.
  • Crane into tank.
  • Unlock suspension.
  • Rearrange cables.
  • Test.

F0/LBB Stuff
  • Install correct IP in PI #2.
  • Crane PI #2 to second floor.
  • Rebuild top filter of PI #2.

To-Do Lists, Schedule

Vacation Info

  • Terrence: 8/24-26 f2f, then returns to Hong Kong.
  • Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-06-24 12:23:36 by fabian.arellano)