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* Type B Past Week Summary * Mark and Fabian went to Kashiwa to clean up glue residue on the dummy BS and do a fit/function test of Tatsumi-san's modified tooling. * Most of the remaining glue came off with soaking in acetone, but there is still some in the machining grooves in the Al surface. Probably more work is required. * A set of cleanroom shoes borrowed from the ATC disintegrated when worn (the plastic had perished from age), which put small pieces of foam all over the floor in Hirose-san's cleanroom and required a lot of clean-up with a sticky roller! Cleanroom suits and shoes for use by Type B team at Mitaka/Kashiwa have been ordered, but will take another week to arrive. * The flag holding parts are now much easier to place and remove, much reducing the risk of breaking flags after gluing. * The sapphire and metal prisms from both the first BS gluing and the PR3 hanging test mirror were brought back to Mitaka for ultrasonic cleaning to remove glue, so they can be reused. * We arranged with Hirose-san to collect the dummy BS and mirror box next Thursday 8/4. (This is conditional on the new clean suits arriving.) Further work will be done at Mitaka. * Hirata-san arranged to borrow the NAOJ Hi-Ace van for the trip. * Hirata-san found the SR versions of the screws for immobilizing the IM and IRM. These fit much better than the BS ones (despite being the same design) and will be used for the BS. * Fabian updated the [[attachment:Geophone_Kamioka.png|geophone noise plot]] with a more accurate calibration and also plotted the [[attachment:Geophone_Kamioka_noise_ratio.png|S/N over readout noise]]. * Fabian identified 210 g of the 600 g deficiency in the IM mass as due to SS parts on the outside. However identifying the rest would require time-consuming disassembly of the IM, and it's not worth it because whatever the cause, the fix is to design and add more trim mass. * Hirata-san measured another filter, and worked on buying various small items. * Mark moved most of the contents of a bunch of older Dropbox and OneDrive shared folders into a new /Subsystems/VIS/TypeB folder on the KAGRA Dropbox. * Mark worked on a list of considerations for locating the BS rack, in preparation for discussions with Miyakawa-san et al. * Type B ongoing issues * OSEMs * Akutsu-san is working to get wide-mouth OSEMs ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1853|2 assembled]]; first 4 expected to be assembled and washed by 8/8) * Longer cables for BF->PI and SF->PI. * Connectors RECEIVED, cables being made. * SR machining test NEARLY DONE. The part looks good and will be used but the ones for SR3 and SRM will be made from scratch. * Lower breadboard stuff * Installation to be incorporated into the procedure document. Mark/Takahashi to discuss. * Breadboard springs - RECEIVED. * Documents * BS Assembly Procedure [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4235| E1504235]], [[https://onedrive.live.com/redir?resid=D5CCFA70A378E0D0!195&authkey=!AM_usynuo9QI57g&ithint=folder,webloc|E1504235 draft]] * To-do list during Mark's vacation * Weigh IM/RM/IRM (Fabian, Hirata) - DONE but anomalies found. * Pack/ship IM/RM/IRM to Kamioka (Hirata/Fabian) - from 8/1. * Analyze geophone data (Fabian/Shoda) - data taken by Shoda-san; Fabian to find calibration factors. * Remove glue from dummy BS face (Fabian) - MOSTLY DONE. * Reglue flags and prisms (Tatsumi, Fabian) - from Friday 8/5. * Clean wire for BS and RM (Hirata) - DONE * Get new winch parts for new wire diameters - design received from Ikenoue-san * Do fit/function test of winches (Fabian/Hirata) * Ship winches to Kamioka (Hirata/Fabian) * Work on BS simulation (Fabian) * Do Inventor assembly for SR2 in chamber and on assembly frame (Hirata) - ONGOING. * Write more of payload assembly procedure (Fabian) * Write more of main assembly procedure (Mark) * Longer term to-do list * Do BS Simulink model (Mark, Kokeyama) * Do 2D drawings of SR2 parts (Hirata) * Redesign SRx IM wire clamps for larger prisms, remachined RMs. * Order SRM/PRM parts (Hirata/Shoda) * Order SRx fasteners (Hirata) |
=== Type B (Mark) === ==== Report for week of 1/14 ==== * Etc * Hirata-san ordered three 41 mm spanners for adjusting the jacks under the top of the tanks. * Mirapro installed bellows on the -Y side of BS and the +Y side of SR2. * Simon got us an LED, a 2D QPD stage and a second 300x400 mm breadboard, which should be enough to do the SRM TILT OL. He's working on a few more items needed for the LEN OL. * Terada-san and Uchiyama-san placed height markers on the SR tank frames showing the BS height and the desired SR heights allowing for 1/300 gradient: SR2 BS+17 mm, SR3 BS+56 mm, and SRM BS+70 mm. * Terrence and Mark reworked the Type B Guardian code to simplify future maintenance, so that the scripts `VIS_BS.py` etc are now tiny stub files which call common code in `TYPEB.py`. * Mark, Terrence and Enzo updated all the Type B models and MEDM screens to add support for binary output to the stepper driver enable inputs, and Enzo ran cables from the front ends to the BIO adapters, and thence to the drivers. We tested the SRM setup but it doesn't yet work. * BS * We installed the three new geophones originally prepared for SRM and then realized we'd made a serious mistake: the old wiring used adapters at both ends of the cable to compensate for the flipped preamps in the original geophones, and we forgot to take out the ones at the rack end. So two of the new ones appear to have been damaged and will have to be repaired. VIS has enough preamps to fix all the broken Type B geophones, but Type A will also need some more soon and there aren't enough in total, so we will have to repair them. * Hirata-san tried various things including turning the F0 FR carriage upside down to try to fix the jamming problem but it didn't seem to help. After advice from Takahashi-san and further debugging we discovered that we had a half-dead channel on the BS_GAS stepper driver, so we switched to a working channel, and that fixed things. * We recalibrated the F0 LVDT, this time measuring the height from the top down as we had been doing for the SRs. We also measured the range of the F0 FR in steps and millimeters and its effect on the keystone. * We tuned the IP for frequency and centered it in L, T and Y. We got 78 mHz. * SRM * Hirata-san checked the F0 yaw stepper and it worked. * (CHECK!!) Hirata-san checked the channels on the SRM stepper drivers and found they all worked. However the F0 FR still didn't move, so he tried turning the carriage upside down, and that fixed it. So between the BS and SRM there were two independent causes of the same problem. * Fabian surveyed the height of the SRM relative to Terada-san's reference with the GAS filters at nominal height and found it was 3.5 mm low. This is well within the range of the jacks, so we will raise the entire suspension to fix it. * Fabian inspected the optic. It seems OK for dust, but there is still some residue left from removing the FC. We may try some more dabbing with acetone. * SR2 * Terrence and Enzo tested the third and last type of collimator (3500 mm) in the OL, but it had much too small a spot and dynamic range. We will standardize on 1.1 mm collimators for all OLs. * Fabian inspected the optic and found patterns that may be FC residue on both sides. * SR3 * Fabian and Ohishi-san tried using the Top Gun to remove dust found earlier by Hirose-san. The AR side came clean but the HR did not improve. Fabian wiped the security structure and LBB with Vectra10 wipes and ethanol. ==== Report for week of 1/21 ==== ==== BS (top priority) ==== * Last Friday: We tuned the IP to have a lower frequency. At the begginig we measured 78mHz. * Last Friday: With Lucia, we centered the IP and diagonalized the IP. After this process we measured a resonant frequency of 40mHz. We closed the position control loop for the IP. * We checked during the weekend and the suspension was not in a healthy state. We checked the IM horizontal OSEM coil driver, and there were some cables in the wrong connectors. (Test in instead of ...) * The adapter for the cable of the F0 fishing rod was not healtly. We fixed it but it might be good to replace it. * The commissioning team steered the BS IM to reach the Y-end and then Terrence centered the oplev with this orientation (more than once). * Fujii-san and Enzo fixed old BS geophones by replacing the Preamp. * We replaced the Geophones for the recently fixed ones. '''(This has not happened yet.)''' * Hirata-san and Fabian secured trim masses to the keystone. '''(This has not happened yet.)''' * We installed GAS Filters and IM control loops. ==== SR2 (priority 2) ==== * We measured the optic height. According to the measurement it was 0.1 mm off. However, the systematic error is likely larger (laser level, position of reference). Apparently, the RM has a small amount of roll but this should be investigated further. It might just be systemaric error of the measurement. The roll of IM was adjusted to a value close to zero before the measurement. * We calibrated the F0 fishing rod stepper motor. * We raised suspension using the jacks. We rotated the jacks by 180 degrees roughly.Compensation has to happen with F0, F1 and BF. * We removed tape, writing etc on PI and PI items. * We removed the trim mass. * Terrence restored the OPLEV to the original layout with an 1.1 m collimator and calibrated the tilt sensing QPD. Expect a pitch range of <MATH>$\pm$<\Math>223 <Math>$\mu rad$<\Math> and a yaw range of <Math>$\pm$<\Math>322 <Math>$\mu rad$<\Math>. * We centered the IP by using the Horizontal stepper motors. '''(This has not happened yet).''' * We diagonalized the IP actuation matrix. We closed the position control loop for the IP. '''(This has not happened yet).''' * We installed GAS Filters and IM control loops. '''(This has not happened yet).''' ==== SR3 (priority 2) ==== * The bouyancy correction was calculated. It's 1.3 mm. * The strategy is rasing the suspension by 1.3 mm and then moving the keystone by 1.3 mm with the fishing rod so the alignment team can work. * We measured the optic height using Terada-san's reference. The SR2 optic was at the correct height. * We raised suspension using the jacks by an amount calculated with the jack thread: M42 with 2 mm special thread. We rotated the jacks by approximately 180 degrees. * Terrence reinstalled OL LED, collimator (1.1 m) and relaigned the OL. Both QPDs were calibrated and expect a range of L: $\pm$332 $\mu m$, P: $\pm$217 $\mu rad$ and Y: $\pm$306 $\mu rad$. * OPLEV diagonalization hasn't been done but we expect minimal coupling due to the OPLEV. Strange couplings (due to the geometry of TM) are expected but no conclusive results yet. * We removed tape, writing etc on PI and PI items. * We calibrated the F0 FR against the readout of the F0 LVDT. We removed the trim masses (110 g). Then we moved the F0 keystone by 1.3 mm downwards. * We centered the IP by adjusting the height of the jacks by small amounts. Longitudinal and Transverse positions came good but there was a large yaw (-5 mrad) when the stepper motors were in mid-range. Currently the yaw is -1 mrad and the steppers are using 80% of their range already. * The F0 yaw stepper should, in principle, give plus minus 125 mrad range. We should check with a measurement how good this range is (e.g. cables being pulled, components touching, etc.) We can use the vertical laser level as an oplev or the main interferometer beam. * '''F1 fishing rod is not responsive. We have to check the cables.''' * We diagonalized the IP actuation matrix. We closed the position control loop for the IP. '''(This has not happened yet).''' * We installed GAS Filters and IM control loops. '''(This has not happened yet).''' '''Talk about problems turning on and off control systems (Terrence and Enzo)''' '''Give status of oplevs (Terrence and Enzo).''' ==== SRM (low priority) ==== * Hirose-san, Hirata-san and Fujji-san fixed the RM to the SS and removed the SRM for cleaning. ==== Postponed ==== * Raise suspension 3.5 mm on jacks. * Check/improve payload alignment and IM OSEMs. Recheck optic pitch with OL as needed.\ * Adjust F0 keystone trim to give desired height and secure weights in place. * Install geophones and arc weights. * Center and tune IP. * Hook LBB and add just enough ballast to have it bouncing. * Wipe inside tank with Vectra-Alpha wipes and IPA. * Set up TILT OL. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 1/14
- Etc
- Hirata-san ordered three 41 mm spanners for adjusting the jacks under the top of the tanks.
- Mirapro installed bellows on the -Y side of BS and the +Y side of SR2.
- Simon got us an LED, a 2D QPD stage and a second 300x400 mm breadboard, which should be enough to do the SRM TILT OL. He's working on a few more items needed for the LEN OL.
- Terada-san and Uchiyama-san placed height markers on the SR tank frames showing the BS height and the desired SR heights allowing for 1/300 gradient: SR2 BS+17 mm, SR3 BS+56 mm, and SRM BS+70 mm.
Terrence and Mark reworked the Type B Guardian code to simplify future maintenance, so that the scripts VIS_BS.py etc are now tiny stub files which call common code in TYPEB.py.
- Mark, Terrence and Enzo updated all the Type B models and MEDM screens to add support for binary output to the stepper driver enable inputs, and Enzo ran cables from the front ends to the BIO adapters, and thence to the drivers. We tested the SRM setup but it doesn't yet work.
- BS
- We installed the three new geophones originally prepared for SRM and then realized we'd made a serious mistake: the old wiring used adapters at both ends of the cable to compensate for the flipped preamps in the original geophones, and we forgot to take out the ones at the rack end. So two of the new ones appear to have been damaged and will have to be repaired. VIS has enough preamps to fix all the broken Type B geophones, but Type A will also need some more soon and there aren't enough in total, so we will have to repair them.
- Hirata-san tried various things including turning the F0 FR carriage upside down to try to fix the jamming problem but it didn't seem to help. After advice from Takahashi-san and further debugging we discovered that we had a half-dead channel on the BS_GAS stepper driver, so we switched to a working channel, and that fixed things.
- We recalibrated the F0 LVDT, this time measuring the height from the top down as we had been doing for the SRs. We also measured the range of the F0 FR in steps and millimeters and its effect on the keystone.
- We tuned the IP for frequency and centered it in L, T and Y. We got 78 mHz.
- SRM
- Hirata-san checked the F0 yaw stepper and it worked.
- (CHECK!!) Hirata-san checked the channels on the SRM stepper drivers and found they all worked. However the F0 FR still didn't move, so he tried turning the carriage upside down, and that fixed it. So between the BS and SRM there were two independent causes of the same problem.
- Fabian surveyed the height of the SRM relative to Terada-san's reference with the GAS filters at nominal height and found it was 3.5 mm low. This is well within the range of the jacks, so we will raise the entire suspension to fix it.
- Fabian inspected the optic. It seems OK for dust, but there is still some residue left from removing the FC. We may try some more dabbing with acetone.
- SR2
- Terrence and Enzo tested the third and last type of collimator (3500 mm) in the OL, but it had much too small a spot and dynamic range. We will standardize on 1.1 mm collimators for all OLs.
- Fabian inspected the optic and found patterns that may be FC residue on both sides.
- SR3
- Fabian and Ohishi-san tried using the Top Gun to remove dust found earlier by Hirose-san. The AR side came clean but the HR did not improve. Fabian wiped the security structure and LBB with Vectra10 wipes and ethanol.
Report for week of 1/21
BS (top priority)
- Last Friday: We tuned the IP to have a lower frequency. At the begginig we measured 78mHz.
- Last Friday: With Lucia, we centered the IP and diagonalized the IP. After this process we measured a resonant frequency of 40mHz. We closed the position control loop for the IP.
- We checked during the weekend and the suspension was not in a healthy state. We checked the IM horizontal OSEM coil driver, and there were some cables in the wrong connectors. (Test in instead of ...)
- The adapter for the cable of the F0 fishing rod was not healtly. We fixed it but it might be good to replace it.
- The commissioning team steered the BS IM to reach the Y-end and then Terrence centered the oplev with this orientation (more than once).
- Fujii-san and Enzo fixed old BS geophones by replacing the Preamp.
We replaced the Geophones for the recently fixed ones. (This has not happened yet.)
Hirata-san and Fabian secured trim masses to the keystone. (This has not happened yet.)
- We installed GAS Filters and IM control loops.
SR2 (priority 2)
- We measured the optic height. According to the measurement it was 0.1 mm off. However, the systematic error is likely larger (laser level, position of reference). Apparently, the RM has a small amount of roll but this should be investigated further. It might just be systemaric error of the measurement. The roll of IM was adjusted to a value close to zero before the measurement.
- We calibrated the F0 fishing rod stepper motor.
- We raised suspension using the jacks. We rotated the jacks by 180 degrees roughly.Compensation has to happen with F0, F1 and BF.
- We removed tape, writing etc on PI and PI items.
- We removed the trim mass.
Terrence restored the OPLEV to the original layout with an 1.1 m collimator and calibrated the tilt sensing QPD. Expect a pitch range of <MATH>$\pm$<\Math>223 <Math>$\mu rad$<\Math> and a yaw range of <Math>$\pm$<\Math>322 <Math>$\mu rad$<\Math>.
We centered the IP by using the Horizontal stepper motors. (This has not happened yet).
We diagonalized the IP actuation matrix. We closed the position control loop for the IP. (This has not happened yet).
We installed GAS Filters and IM control loops. (This has not happened yet).
SR3 (priority 2)
- The bouyancy correction was calculated. It's 1.3 mm.
- The strategy is rasing the suspension by 1.3 mm and then moving the keystone by 1.3 mm with the fishing rod so the alignment team can work.
- We measured the optic height using Terada-san's reference. The SR2 optic was at the correct height.
- We raised suspension using the jacks by an amount calculated with the jack thread: M42 with 2 mm special thread. We rotated the jacks by approximately 180 degrees.
- Terrence reinstalled OL LED, collimator (1.1 m) and relaigned the OL. Both QPDs were calibrated and expect a range of L: $\pm$332 $\mu m$, P: $\pm$217 $\mu rad$ and Y: $\pm$306 $\mu rad$.
- OPLEV diagonalization hasn't been done but we expect minimal coupling due to the OPLEV. Strange couplings (due to the geometry of TM) are expected but no conclusive results yet.
- We removed tape, writing etc on PI and PI items.
- We calibrated the F0 FR against the readout of the F0 LVDT. We removed the trim masses (110 g). Then we moved the F0 keystone by 1.3 mm downwards.
- We centered the IP by adjusting the height of the jacks by small amounts. Longitudinal and Transverse positions came good but there was a large yaw (-5 mrad) when the stepper motors were in mid-range. Currently the yaw is -1 mrad and the steppers are using 80% of their range already.
- The F0 yaw stepper should, in principle, give plus minus 125 mrad range. We should check with a measurement how good this range is (e.g. cables being pulled, components touching, etc.) We can use the vertical laser level as an oplev or the main interferometer beam.
F1 fishing rod is not responsive. We have to check the cables.
We diagonalized the IP actuation matrix. We closed the position control loop for the IP. (This has not happened yet).
We installed GAS Filters and IM control loops. (This has not happened yet).
Talk about problems turning on and off control systems (Terrence and Enzo)
Give status of oplevs (Terrence and Enzo).
SRM (low priority)
- Hirose-san, Hirata-san and Fujji-san fixed the RM to the SS and removed the SRM for cleaning.
Postponed
- Raise suspension 3.5 mm on jacks.
- Check/improve payload alignment and IM OSEMs. Recheck optic pitch with OL as needed.\
- Adjust F0 keystone trim to give desired height and secure weights in place.
- Install geophones and arc weights.
- Center and tune IP.
- Hook LBB and add just enough ballast to have it bouncing.
- Wipe inside tank with Vectra-Alpha wipes and IPA.
- Set up TILT OL.