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| ==== Report for week of 7/30 ==== ===== SR3 ===== * We undid the accidental misalignment of the SR3. We also switched off the BF GAS offset we had been using, let the IM rise until near zero on the BF LVDT, and adjusted the IM vertical OSEMs back to mid-range. * We closed control loops for the SR3 GAS filters. * Terrence set up the LED and TILT QPD for the final OL, and did a new calibration. |
==== 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. |
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| * We installed the SR2 SF damper magnet ring but found that the magnet pattern didn't match the Cu segments due to a different in the caps between SR3 and SR2. We raised the ring but left it suspended, clamped the template to the underside and rearranged the magnets. * We did a vertical height budget of the SR2. It turns out to have a very similar issue to the SR3: the chain is about 5 mm longer than the CAD, with about 3 mm of that between the SF and BF. We decided to do the same fix and operate with the F0 keystone 5 mm higher. We chose an total amount of ballast to give that keystone height and secured most of it to the SF, keeping a reserve for cables and the yaw stepper. * We routed most (all?) of the SF/... cabling up to the PI. |
* 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). |
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| * We moved the SRM assembly frame into its final position, reset it to the initial configuration, double-checked the heights of the crossbars, and lowered the optical table by 3 mm (to give margin for the optic to rise during hanging, which we had kept forgetting to do). We cleaned it up with the airgun and wet-wipes. We installed the IM ring and IM. * We assembled the SRM metal mass. Hirata-san made a jig from a plate with 4 screws which could safely hold the delicate front Sol-Black-coated ring upside down while the rest of the components were mounted on it. * We moved the metal mass to the mirror box and added the prisms and magnet standoffs. We applied the EP30 on Friday morning, but probably won't be able to check the result until after Obon. ==== Plan for week of 8/13 ==== * KAGRA closed Mon, Tue. * Mark on vacation Mon-Thu, then Mitaka on Friday. * Enzo, Fabian, Terrence, Panwei, Rikako at Kamioka Wed-Fri. Probably no tunnel work. * Hirata-san on vacation all week. * TFs with new OL. * Controls work. * Tune SR3 IP? ==== Plan for week of 8/20 ==== * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri. * Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Thu, then f2f. * Kozu-kun works at Mozumi Mon. ===== SR3 ===== * Hook LBB, add ballast mass. * Tune IP. |
* 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. |
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| * Adjust ballast/trim mass, with reserve for yaw stepper. * Cable/test PI items (LVDTs, steppers, geophones). * Set damper height. * Add arc weights, adjust IP. * Stage LBB damper rings in tank. |
* Set up OL. |
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| * Check gluing result - redo if necessary. * Assemble RM. * Add IM ballast masses (we forgot this before). * Get parts from AOL and set up new pitch-setting OL. * Hang metal mass. * Hang RM. |
* Continue assembly. |
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| ==== Vacation Info ==== * Mark: 8/13-16. * Hirata-san: 8/13-17 * Terrence: 8/24-26 f2f, then returns to Hong Kong. * Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile. |
==== Vacation/Visitor Info ==== * Terrence: 10/29-11/2 at Kamioka. |
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.