Differences between revisions 282 and 296 (spanning 14 versions)
⇤ ← Revision 282 as of 2018-04-29 15:44:54 →
Size: 4129
Editor: MarkBarton
Comment:
← Revision 296 as of 2018-06-21 15:21:59 → ⇥
Size: 2970
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
Line 6: Line 6:
==== Report for week of 4/23 ====
 * We hung the optic and set its pitch. The winch system had a lot of slop in it but the technique of relaxing the wires by lifting the optic on the EQ stops was effective in getting consistent results.
 * We tightened the clamps using a torque wrench, using settings of 5 N.m for the primary clamps and 20 N.m for the secondary.
 * We hung the RM and set its pitch. The RM winches were a lot more consistent.
 * However when tightening the clamps, the wire on the +Y side broke at the bottom edge of primary clamp. The wire on the -Y held, so the RM dropped a few mm onto the trolley on the +Y side.
 * We raised the RM trolley to support the RM and left the optic hanging inside it overnight as a safety test.
 * We then reversed the usual installation procedure to remove the RM and get the mirror box around the optic. We used clamp pieces as spacers to bridge the gaps created by the fact that the optic had been raised 3 mm during hanging and could not safely be lowered. We then cut the wires, leaving the op
 * Shoda-san made SRM model (Dropbox/Largefiles/Subsystems/VIS/Design/SR/Model/SRM-MetalMass_180426)
 * Shoda-san made 2D drawings of LBB ballast masses
 * Hirata-san washed parts.
==== Control Issues ====
 * Resonant frequency table is ready for BS ([[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/TypeB/BSdetail|BS suspension details]])
 * We found the inconsistency between local damping measurement and interferometer measurement. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4811|klog4811]])
  The TF gains from IML to TML, and from TML to TML are different from the interferometer measurement.		 ==== 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.
 * 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 ...
 * 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.
 
==== Plan for week of 6/25 ====
 * Mark, Enzo, Hirata-san, Terrence at Kamioka Mon-Fri.
 * Kozu-kun at Kamioka except Thu.
 * --
 * Shutdown Type B controls (as far as possible) in preparation for risk of accidental power outage during electrical work on 6/26.
 * Add calculated ballast to SF.
 * Park F0 #1 (for SR2) in top of SR3 assembly frame.
 * Move F0 #3 behind SR3.
 * Move F0 #1 to "factory" area (in front of SRM) and start rebuild.
 * Install PI.
 * Suspend SF/... section.
 * Lots of cable routing.
Line 21: Line 30:
  * I checked the TML gain, which are calculated from TMP and TMY measurements, and found EUL2COIL matrix was different from what I supposed.
   --> Fixed it and updated the state space model. Might be OK now for TF from TML to TML. (Komori-kun will check it.)
  * I checked the calibration gain of OSEMs and found that the measured values are not used. But it makes only small difference.
  * Compare the TFs from BFGAS to BFGAS and BFGAS to IMV, and they are inconsistent for BS and PR2. (No data found for PR3)([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4807|klog4807]])
  * Comparing TFs from IMP to TMP and from IMY to TMY also helps to check the OSEM calibration by comparing OSEM signals and Oplev signals.
   Found the matrix to convert OSEM signals (um) to pitch (urad) is different from what I calculated. To be checked.
   The measurement will be done after phase-I.

 * Constructing the tool to implement the current filterbank information to state space model.

==== Plan for week of 4/30 ====
 * Shoda-san at Mitaka.
 * Mark, Enzo at Kamioka Mon-Wed or TBD.
 * Others having fun doing Golden Week stuff.
 * --
 * Observe KAGRA Phase 1 operations, assist if problems arise.
 * Do BF TFs.

==== Plan for week of 5/7 ====
 * Shoda-san at Mitaka.
 * Enzo at Kamioka from Tue.
 * Mark, Hirata-san at Kamioka full week.
 * Kozu-kun at Kamioka??
 * Tanioka-kun at Kamioka Mon, Tue.
 * --
 * Continue SR3 Hang
  * Inspect clamps and decide whether to reuse or swap in clamps from SRM IM.
  * Rehang optic.
  * Rehang RM.
  * Cable RM OSEMs.
 * Prepare for filter testing
  * Remove cracked blades from F0 #1 and #3.
  * Remove floor panel in SR3 area.
  * Set up filter building trolley with crossbars, jacks and F0 test masses.
 
 * Etc
  * Test prototype SR3 safety bar, and set up second safety bar.
  * Negotiate with Mirapro to get SRM mushroom installed, avoiding 5/15.
 ==== 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.
Line 62: Line 36:
 * [[KAGRA/Subgroups/VIS/TypeB/March2018]]
 * [[KAGRA/Subgroups/VIS/TypeB/April2018]]
Line 66: Line 38:
 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779-v1 Type B Schedule (SR)]]  * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]]
Line 69: Line 41:
 * Fabian vacation, 3/26-4/27 (then gone).  * Kozu-kun: 7/4 Tokyo.
 * Enzo: 7/5-6 NAOJ Party, Mitaka.
 * Terrence: 8/24-26 f2f, then returns to Hong Kong.
 * Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

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.
  • 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 ...
  • 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.

Plan for week of 6/25

  • Mark, Enzo, Hirata-san, Terrence at Kamioka Mon-Fri.
  • Kozu-kun at Kamioka except Thu.
  • --
  • Shutdown Type B controls (as far as possible) in preparation for risk of accidental power outage during electrical work on 6/26.
  • Add calculated ballast to SF.
  • Park F0 #1 (for SR2) in top of SR3 assembly frame.
  • Move F0 #3 behind SR3.
  • Move F0 #1 to "factory" area (in front of SRM) and start rebuild.
  • Install PI.
  • Suspend SF/... section.
  • Lots of cable routing.

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.

To-Do Lists, Schedule

Vacation Info

  • Kozu-kun: 7/4 Tokyo.
  • Enzo: 7/5-6 NAOJ Party, Mitaka.
  • Terrence: 8/24-26 f2f, then returns to Hong Kong.
  • Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.

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