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| ==== Report for week of 10/29 ==== * SRM * Enzo repaired some broken cables and made some long cables from shorter ones. We ultrasonically cleaned them at Toyama U, with help from Yamamoto-san. Enzo then reinforced the joins with EP30 (two cables) or heat shrink. * Hirata-san finished tuning the PI. It is now complete except for some PEEK cable clamp pieces which are expected next Monday. * Hirata-san wiped writing marks off the F0 and SF yoke magnets, and off the PI. * Hirata-san found we were running out of magnets and ordered more - we have almost enough (short by one) for the SF damper, but will need more for the LBB damper. * Fabian cabled and tested the BF cap picos. * Fabian routed all the cables up to the underside of the SF. He cabled and tested the SF LVDT and stepper. * We added the SF cap and weighed the SF/... section. We appear to have a good amount of load capacity margin. * SR2 * We opened the SR2 tank, borrowed a geophone for Fujii-kun's geophone test, and left the IP locked. * We gathered parts for the SR2 OL. We believe we have all the pieces we need except for an LED (the one originally allocated to SR2 is currently being used for pitch setting on SRM and we may need to steal it back). Akutsu-san wants to supervise us setting up the LED and receiver supports, so that will happen next week. * SR3 * Terrence visited for another week and made more measurements on the OL. A report is forthcoming. * BS * We searched for the dog clamps that we had borrowed from AOS to serve as ballast for the BS LBB and returned them to the AOS pallet. * Electronics * Enzo analyzed the LPCD and worked out the resistors we need to get the drive current recommended for the IM-V OSEMs by Shoda-san. ==== To-Do Lists, Schedule ==== * [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoSR]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]] |
==== Report for the week of 2/25 ==== |
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| ==== Plan for week of 11/4 ==== * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri. ===== SRM ===== * Main sequence * Add magnets to SF damper. * Install #353 poles * Move NB-03 jacks down. * Crane PI into AF. * Install F0-SF rod (#331) and flying saucer. * Route SF/... cables up to underside of F0. * Do vertical height budget. * Adjust SF trim mass for balance and keystone height. * Cable/test IP LVDTs. * Cable/test IP FRs. * LBB * Move KOACH filters * Put LBB damper rings in tank. * Set tank jacks to nominal height. |
* Fabian monitored suspensions during the vent. * Terrence and Mark made lots of changes to the Guardians and RTMs: * Added UI to take snapshots with ALIGNED/MISALIGNED channels (for late use by Guardian). * Changed "IM1" and "IM2" in channel names to "IMV" and "IMH"; also "DIO" and "BO" -> "BIO". * Created library blocks for BIO and made all the Type B models use them. * Tweaked the control topology to be more LIGO-style: the error signal for DC control is sensor-setpoint (not setpoint-sensor as in many controls textbooks); the input to the damping block is the uninverted sensor signal(s); there is a hard-wired -1 after the damping block representing default negative gain. * Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.) * Terrence traced the geophone issue to a group of dead channels (#20-23) on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the TILT OL path (#24-27) that we had planned to debug next. * We retested the BIO for stepper remote enable system and this time it was working (probably due to the refactoring of the BIO stuff in the model and/or all the restarts). * We rebuilt all the IOP models after removing an unneeded ADC1 block (corresponding to hardware that Yoshizawa-san had removed). * Enzo and Terrence wrote Python scripts to automate the process of adapting the control filters to the new topology (where the DAMP and DCCTRL functions are in parallel instead of series). ==== Plan for week of 3/4 ==== * Enzo at Mitaka. * Mark, Fabian Mon-Wed (Thu is farewell party). * Final tweaks of SRM? * Monitor (re-)pumpdown. * Tests of new Guardian. * Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off). * Continue monitoring SRM yaw drift. * Setup SRM and SR3 LEN OLs. * Work on Type B paper. |
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| ==== Plan for week of 11/11 ==== * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri. ===== SRM ===== * Unlock IP and center roughly. * Calibrate IP LVDTs. * Check/adjust alignment of SS. * Add arc weights and geophones (or extra mass equivalent to geophones). * Cable/test geophones. * Improve centering/tuning of IP and SS alignment. ==== Plan for week of 11/18 ==== * Friday 11/23 is Labor Thanksgiving Day. * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Thu. ===== SRM ===== * Unlock IP and center roughly. * Calibrate IP LVDTs. * Check/adjust alignment of SS. * Add arc weights and geophones (or extra mass equivalent to geophones). * Cable/test geophones. * Improve centering/tuning of IP and SS alignment. * Crane into tank. |
==== Plan for week of 3/11 ===== * Mark at Kamioka full week? * Enzo at Kamioka Mon, Tue, then JPS. * ==== Vacation/Travel Info ==== * Enzo vacation, 3/5 and 3/6. * Enzo et al. Farewell Party, 3/7. * Enzo at JPS then final vacation, 3/13-29 * Terrence's last day, 3/29. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for the week of 2/25
- Fabian monitored suspensions during the vent.
- Terrence and Mark made lots of changes to the Guardians and RTMs:
- Added UI to take snapshots with ALIGNED/MISALIGNED channels (for late use by Guardian).
Changed "IM1" and "IM2" in channel names to "IMV" and "IMH"; also "DIO" and "BO" -> "BIO".
- Created library blocks for BIO and made all the Type B models use them.
- Tweaked the control topology to be more LIGO-style: the error signal for DC control is sensor-setpoint (not setpoint-sensor as in many controls textbooks); the input to the damping block is the uninverted sensor signal(s); there is a hard-wired -1 after the damping block representing default negative gain.
- Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.)
- Terrence traced the geophone issue to a group of dead channels (#20-23) on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the TILT OL path (#24-27) that we had planned to debug next.
- We retested the BIO for stepper remote enable system and this time it was working (probably due to the refactoring of the BIO stuff in the model and/or all the restarts).
- We rebuilt all the IOP models after removing an unneeded ADC1 block (corresponding to hardware that Yoshizawa-san had removed).
- Enzo and Terrence wrote Python scripts to automate the process of adapting the control filters to the new topology (where the DAMP and DCCTRL functions are in parallel instead of series).
Plan for week of 3/4
- Enzo at Mitaka.
- Mark, Fabian Mon-Wed (Thu is farewell party).
- Final tweaks of SRM?
- Monitor (re-)pumpdown.
- Tests of new Guardian.
- Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off).
- Continue monitoring SRM yaw drift.
- Setup SRM and SR3 LEN OLs.
- Work on Type B paper.
==== Plan for week of 3/11 =====
- Mark at Kamioka full week?
- Enzo at Kamioka Mon, Tue, then JPS.
Vacation/Travel Info
- Enzo vacation, 3/5 and 3/6.
- Enzo et al. Farewell Party, 3/7.
- Enzo at JPS then final vacation, 3/13-29
- Terrence's last day, 3/29.