= ISC Meeting on 2016/9/20 14:00 - 15:00 = Participants: Michimura, Aso, Enomoto, Akutsu, Haino === Next meeting === 2016/10/17 14:00 - 15:00 [[LCGT/subgroup/ifo/ISC/Meetings|back to Meetings page]] == Minutes == * bKAGRA Phase 1 commissioning [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5595|JGW-T1605595]] * UPDATE: no PR-related adjustments before Michelson operation * Arai and Aso agreed * MIF recommend not to install Pcal at Phase 1 considering tight schedule * '''check if transmitted beam can go through when ETM is not installed [Michimura -> Saito, Uchiyama, Kimura]''' * check if EXC-EXT (EYC-EYT) ducts are installed considering ETM wedge * wide/narrow angle baffles for Phase 1? * install if schedule permits; check with Uchiyama [Akutsu] * INTERFACE: Pcal and narrow angle baffles * how to see the HR surface of ETM? [Akutsu, Inoue] * we need to see ETM HR surface for the beam alignment and Pcal spot position monitor * we have viewports to see HR surface at 45 deg; but wide angle baffle can be an obstacle * holes for wide angle baffles? * camera with telescope from EXA/EYA? * since angle is too narrow, scattering maybe too low, and cannot see from cameras? -> '''calculation [Akutsu]''' * bKAGRA Phase 1 electronics * electronics for IMC WFS are most urgent (we need them by the end of Oct 2016) * RF amps for Distribution Amplifier not yet arrived * need to check RF QPDs [Niigata U?] * IR LED is at Kamioka, no network analyzer at Kamioka (one at Toyama U and the other at Kashiwa) * still, we can tune the resonance with IR LED or test inputs * Aperture of sapphire test mass * recoil mass aperture is OK for diffraction loss and scattering noise * what is the baffle aperture? * see Fig 2 of [[https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-6-5-1613&id=339003|Optical Materials Express 6, 1613 (2016)]] * #1 arm-duct baffles 720 mm dia. * #2 cryo-duct shields 270 mm dia. * #3 narrow angle baffles 254 mm dia. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4223|JGW-D1504223]] * #4 wide angle baffles '''not decided''' * if smaller than 169 mm, loss will be larger than 10 ppm, and should be considered * if larger than 191 mm (larger than recoil mass aperture), no problem at all * MIR update [Hirose via Email] * test plate of IMMT1 was characterized; modifying RoC a little for IMMT1&2 based on the information * coated optics will be characterized once they finish coating == Agenda == * bKAGRA Phase 1 optical configuration study [Michimura] * summary: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5595|JGW-T1605595]] * UPDATE: no PR-related adjustments before Michelson operation * ASC [Enomoto] * noise study by Noise``Budget [Enomoto] * Enomoto volunteered to do ASC Noise``Budget; meeting on Sept 27 * effect on WFS from RF HOMs [who?] * check if reference spheres for PR mirrors are available at Caltech [Hirose] * 9.0m (CC), 11.5m (CC), 6.5m (CC), 5.0m (CC), 34m (CX), 36m (CX) were available * PR2/SR2 is -3.0764m/-2.9872m and PR3/SR3 is 24.9165m. Maybe 5.0m TS can be used for PR2/SR2. * what about PR3/SR3, PRM/SRM? * check if IMC length stability and others are compatible with 3-km PRMI [Michimura] * bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5595|JGW-T1605595]] * beam profiling plan should be compatible with vacuum plan; MIF will lead the planning * not only PR2-PR3 but also IMMT1-IMMT2 * how to extract AS beam should be fixed by MIF * according to CRYp current schedule; * Oct 31, 2017: ETMY CRYp installation done * Dec 8, 2017: ETMY cool down starts * Feb 13, 2018: ETMX CRYp installation done * Mar 2, 2018: ETMY cool down starts * --(we need more time for PR-ETMY cavity)-- * no more PR-ETMY cavity before Michelson operation * do we have enough time for TMS measurement and PR2-PR3 adjustment? * initial alignment plan including green is taken cared by MIF [confirmed with Kawamura, Moriwaki on Aug 30] * bKAGRA Phase 1 analog electronics ([[KAGRA/Subgroups/MIF/AEL|Analog Electronics for ISC]]) [Michimura] * Quad IQ Demodulator heat-up issue * 1st stage amp is heating up * '''we have to decide if we need 1st stage amp or not''' * remake of Quad IQ Demodulator LSC to ASC [Michimura->Niigata students?; by 2016.10] * MIF will take care instead of AEL * mass production will be taken care by AEL * 4-way splitter (Mini-Circuits ZFSC-4-1-S+) arrived at Kamioka -> Mozumi office loft * RF Distribution Amplifier [Michimura->Niigata students?; by 2016.10] * we will omit RF monitor for now, and add them later * Nakano found front/rear panels -> Mozumi office loft * ordered RF amp (Wenzel LNBA-11-23-CK-100-15) -> not yet arrived (by the end of Sept?) * 8-way splitter (Mini-Circuits ZCSC-8-1+), coupler (Mini-Circuits ZX30-20-4) arrived at Kamioka -> Mozumi office loft * cables and connectors to assemble one chassis by hand arrived at Kamioka -> Kokeyama's desk * basically copy of [[https://dcc.ligo.org/LIGO-D1000124/public|LIGO-D1000124]], but we will omit [[https://dcc.ligo.org/LIGO-D1000064/public|Interface]] for the first stage * asked AEL to make RF amplifier interface board (which is also used for Frequency Doubler) [Michimura] * RF Patch Panel modification [Michimura->Niigata students?] * one by one by hand is tough; outsource? * Electronics request meeting with Miyakawa/Kamiizumi on Aug 24 * photos of the assembled chassis are helpful for AEL * does anyone have a photo of Frequeny Doubler? [[https://dcc.ligo.org/LIGO-D1002178/public|LIGO-D1002178]] * asked Izumi and Kokeyama * RF PDs and RF QPDs * RF PD / RF QPD noise and transimpedance characterization [who?] * RF PD modification [who?] * fix DC path * solve single supply issue (RF PDs easily break when accidentally supplied with single) * fix plugs so that Dsub 9pin cable fixes better * Output optical tables [Michimura] ([[KAGRA/Subgroups/IOO/OutputTables|OutputTables wiki]]) * '''Kawamura suggested to move this task from IOO to MIF''' * vacuum optics to extract beams for each port (except for REFL and AS DC) and related beam shutters will also be MIF task * MIF and IOO agreed, SEO agreed, next step is budget migration * RF generation scheme [Michimura] * f1 = 3/8*f2, f3 = 10/8*f2 * we need 2*f1, 2*f2, f3-f1, f3-f2 as well * use harmonics generator (x2, x3, x6, x8, x10, x16 for f2/8 = 5.62698725 MHz (FSR for IMC)) * seeking for vendors * MIF and IOO agreed to use 13.78 MHz　(~= f2/8*2.45) for IMC sideband ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5493|JGW-T1605493]]) * MIF agreed to use 32 MHz and 33 MHz for ALS sidebands [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5626|JGW-T1605626]] * may be IMC sideband (and ALS sidebands) should also needs to be phase locked with f1/f2/f3 to avoid "whistling noise" * Arm Length Stabilization plan ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5353|JGW-T1605353]]) * Noise``Budget [Kambara] * results agreed with Tatsumi Simulink model * include fiber noise (fiber setup is different from Tatsumi model) * fiber length? how to do the wiring? * include phase noise from mirror vibration for IR beat setup (it is one of the limiting noise source for aLIGO) * schedule and plan for the procurement of circuits should be fixed soon * keep in touch with AEL group ----- * bKAGRA optical layout around PRC * POY clipping issue will be solved by modifying PR3 optical bench suspension [Shoda] * we need layout CAD for POY pickoff mirror, POP pickoff mirror to design baffles * budget for baffles around POY and POP were shifted to next FY [SEO] * iKAGRA post-run calibration mystery [Aso] * mysterious LPF was from saturation ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1958|elog #1958]]) * Requirement for the noise of watchdogs for coil drivers [Aso] * recent result show dR < 1e-7 Ohm/rtHz, so it may meet the requirement * slow (~20 min) drift at dR ~ 5e-4 Ohm -> this should be negligible * Viewport quality for GV between SRM and OMMT [Akutsu] * aLIGO case: SRM-OFI-viewport, KAGRA case: SRM-viewport-OMMT-OFI * aLIGO viewport is always closed * '''if we need super quality viewport, we have to decide soon''' * BS baffle could make contract defect? ([[https://dcc.ligo.org/LIGO-T1000090|LIGO-T1000090]]) * ask Akutsu and Hiro * BS has 370 mm dia and beam at BS is 2*36 mm dia. So, it should be in principle OK. But recoil mass aperture should be considered. * bKAGRA ISC cabling [Michimura/Doi] * announced to IOO mailing list * need to update the cabling diagram * Mirror absorption measurement status [Hirose] * Output optics status [Somiya] * suspensions for OMMT1/2 is same as IMMT1/2 (driver list for now: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5334|JGW-L1605334]]) * we have to make vacuum compatible PD/QPD for OMC by 2018.3 * beam shutter: prototype done, AR coating and driver circuit design not yet * '''OMC suspension requirement cross check [Somiya]''' * OFI, OMMT, OMC meeting on 2016.9.14 * design suspended table similar to TMS? * Magnetic noise, actuator noise calculation for cryogenic payload [Michimura] * '''Ask Tomaru about the parameters and actuator design, range''' * Task list update ([[KAGRA/Subgroups/MIF/TaskList|TaskList]]) [Michimura]