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Size: 2846
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| Deletions are marked like this. | Additions are marked like this. |
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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. ===== SR2 ===== * 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. |
==== Report for week of 10/22 ==== |
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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. * Hirata-san on vacation all week. * Fujii-kun to help part-time with crane work and/or the IP tuning. * Diagonalization of new OL. * TFs with new OL. * Test of SF damper ring. * 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. |
* We borrowed the TM HPCDs from SR2 and SR3 so that SRM had HPCDs for IM-H, IM-V and GAS. * Fabian adjusted the last two OSEMs (IM-H2 and H3). * We closed the BF and weighed the BF/... section. * Fabian and Hirata-san routed all the BF/... cables via the BF cap (except for the four TM OSEM cables, where we're still waiting for extensions). * We built up the assembly frame and security structure to the SF level and craned in the SF. * We installed the SF-BF rod and flying saucer. * Hirata-san collected a suitable CuBe spring and bracket parts from Type A. He ultrasonically cleaned the bracket and then installed the bracket and spring on the F0. * Enzo soldered some short and/or broken cables to make longer cables that we need urgently. He got in touch with Yamamoto-san to arrange bringing them to Toyama University and ultrasonically cleaning them. * We pulled out cables running to the OMMT area that were used for the old OSEM/geophone testing setup and started a new geophone testing setup in the SR3 area using the optical table from the SR2 assembly frame. * Hirose-san reported results from his astigmatism test on the second SRM small optic and metal mass. With the tight shims (1.0 mm thickness, as used for the installed SRM) there was substantial astigmatism, but with the next looser available size (1.5 mm), there was no astigmatism but the optic is held very poorly and rattles. Hirose-san is ordering some intermediate thicknesses and will make a recommendation. However he will almost certainly suggest that we change the shims on the hanging SRM, so we need to think about whether that is feasible. |
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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. |
* Akutsu-san collected the parts we will need for the SR2 OL so that Terrence can install it next week. * Hirata-san supervised the disassembly of the assembly frame. The pieces are now in the IMMT area, although we may need to move them again because they're a bit in the way. ==== Plan for week of 10/29 ==== * Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri. ===== SR2 ===== * Set up OL. * 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.) * Possibly add more arc weights, to get below 0.1 Hz. |
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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 10/22
SRM
- We borrowed the TM HPCDs from SR2 and SR3 so that SRM had HPCDs for IM-H, IM-V and GAS.
- Fabian adjusted the last two OSEMs (IM-H2 and H3).
- We closed the BF and weighed the BF/... section.
- Fabian and Hirata-san routed all the BF/... cables via the BF cap (except for the four TM OSEM cables, where we're still waiting for extensions).
- We built up the assembly frame and security structure to the SF level and craned in the SF.
- We installed the SF-BF rod and flying saucer.
Hirata-san collected a suitable CuBe spring and bracket parts from Type A. He ultrasonically cleaned the bracket and then installed the bracket and spring on the F0.
- Enzo soldered some short and/or broken cables to make longer cables that we need urgently. He got in touch with Yamamoto-san to arrange bringing them to Toyama University and ultrasonically cleaning them.
- We pulled out cables running to the OMMT area that were used for the old OSEM/geophone testing setup and started a new geophone testing setup in the SR3 area using the optical table from the SR2 assembly frame.
- Hirose-san reported results from his astigmatism test on the second SRM small optic and metal mass. With the tight shims (1.0 mm thickness, as used for the installed SRM) there was substantial astigmatism, but with the next looser available size (1.5 mm), there was no astigmatism but the optic is held very poorly and rattles. Hirose-san is ordering some intermediate thicknesses and will make a recommendation. However he will almost certainly suggest that we change the shims on the hanging SRM, so we need to think about whether that is feasible.
SR2
- Akutsu-san collected the parts we will need for the SR2 OL so that Terrence can install it next week.
- Hirata-san supervised the disassembly of the assembly frame. The pieces are now in the IMMT area, although we may need to move them again because they're a bit in the way.
Plan for week of 10/29
- Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri.
SR2
- Set up OL.
- 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.)
- Possibly add more arc weights, to get below 0.1 Hz.
SRM
- Continue assembly.
To-Do Lists, Schedule
Vacation/Visitor Info
- Terrence: 10/29-11/2 at Kamioka.