Differences between revisions 334 and 336 (spanning 2 versions)
Revision 334 as of 2018-10-12 13:28:07
Size: 2761
Editor: MarkBarton
Comment:
Revision 336 as of 2018-10-19 13:23:15
Size: 3428
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
Line 6: Line 6:
==== Report for week of 10/8 ====
 * This was Panwei's last week (for now at least) - thanks for all the help!
 * Thanks also to Terrence for visiting again for the week.
===== SR3 =====
 * Terrence and Mark finished setting up the LEN half of the OL (Simon had roughly placed the components). They ran a new cable for LEN in the cable tray and relaid the cable for TILT to get it off the floor.
 * Terrence worked on diagonalizing the LEN OL. A report is forthcoming.
==== Report for week of 10/15 ====
Line 13: Line 8:
 * Mark installed a pair of power supplies in the SRM and copied settings across to the SRM real-time model.
 * Fabian did lots of rack cabling, including installing and connecting BIO cards.
 * Mark and Hirata-san checked and adjusted the pitch of the BF (with a bubble level) and the IM/... section (with the OL).
 * Mark and Panwei installed the sides of the IRM and the IM OSEMs.
 * Hirata-san hung the dummy load from the F0 and started compressing the blade. There was a significant lateral offset (≈2-3 mm towards the blade at 5:30) at first but Takahashi-san advised that it would probably improve with compression, and it did.
 * Mark and Hirata-san cleared off most of two optical tables and a set of shelves in the OMMT area that Type B had been using but were now required by Somiya-san and Ohishi-san. We still need to remove the geophone and OSEM testing setups.
 * 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.
Line 21: Line 19:
 * Mark, Enzo and Hirata-san all inspected the lower section of the SR2 to see if there were any interference points that might explain some unexpected peaks in the TFs (especially the RM pitch made appearing in longitudinal) that weren't present before installation. There were no stops touching, but some TM OSEM cables were rubbing against each other, which we fixed. The problem turned out to be swapped cables in the coil actuation.
 * We removed the tank lid, and Enzo and Panwei inspected the cabling that had been done during Enzo's vacation and installed some new cables that had arrived. They also unlocked the IP.

==== Plan for week of 10/15 ====
 * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri.
 * 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, Hirata-san and Fabian at Kamioka Mon-Thu.
 * Enzo at Kamioka Tue-Thu.
Line 27: Line 27:
 * Continue shakedown of PI section.  * 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).
Line 29: Line 31:
 * Align IRM with IM.  * Scavenge HPCDs from SR2 and SR3 (currently we only have one for SRM) and organize to get LPCDs modified.
Line 33: Line 35:
==== Plan for week of 10/29 ====
 * Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri.
===== SR2 =====
 * Set up OL.
===== SRM =====
 * Continue assembly.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

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, Hirata-san and Fabian at Kamioka Mon-Thu.
  • Enzo 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.

To-Do Lists, Schedule

Vacation/Visitor Info

  • Terrence: 10/29-11/2 at Kamioka.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-04-22 13:34:51 by fabian.arellano)