= VIS Meeting on 2016/5/20 = 2016/5/20 13:30 - Room 210 Participants:Sato, Hirata, Ishizaki, Mark, Fabian, Takahashi, Ohishi, Aso, Shoda, Raffaele, Okutomi, Akutsu == Overall Schedule == * The current overall schedule [[https://www.dropbox.com/s/zbhhxlyd79sqe1w/VIS-2016-04-15.pdf?dl=0|chart]]. = iKAGRA related activities = == PR3 == * PR3 post-run work status (Shoda) * Planned works * 5/16: measurement of PR3 mirror position relative to the vacuum tank-> [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1768|done]] * 5/17: OpLev wind shield test?, Inner frame status check. -> [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1769|done]] * 5/18: Extended chief meeting * 5/19, 20: Evacuation -> going on. [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1775|klog1]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1776|klog2]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1777|klog3]] == IP tests in Kamioka == * #Control test may be performed with the hanging test of BS * Ask Joris what is his intention and schedule (Raffaele) * Ask if we can perform the control test remotely (Aso) = bKAGRA preparation = == Important Issues == * Suspended bread board * #Many critical components will be installed on it (baffles, steering mirrors for the green injection etc) * We have to make sure that the bread board suspension is properly damped * Takahashi checked Sekiguchi thesis * Damping effect depends on the ratio of mass and resonant frequency. Estimated effect was 0.45 for the experiments. The number of magnets needed in the same condition is about half. * '''30 magnets necessary for the gap of 5mm -> need to update the calculation for the double pendulum case (Takahashi) ''' * Accelerometers for IP * Geophone is too noisy for innertial damping in Kamioka -> this argument presented in Sekiguchi PhD thesis * #TAMA SAS accelerometers for Type-A * NIKHEF accelerometers for BS * Joris seems to be interested in continue the test according to Raffaele. * Need to see if this accelerometer is good enough (seems to have some problems). * #Which accelerometers for SR ? * Buy from NIKHEF ? How much is the cost ? * Get the design from NIKHEF and produce them in Japan (ATC) ? * '''Conclusions of this week''': * We should first see the result of Fujii-kun's test. '''Aso will follow up on his experiment in the next week. ''' * For the question of how bad the geophone is, '''Shoda will check Sekiguchi thesis and report by email. ''' * Pre-isolator assembly and tests * Sato-san will come to Kamioka next week * What is the plan for SR Type-B * Takahashi and Mark will start the discussion on, where, who, when -> '''continue.''' * Bottom filter local sensor for Type-A * Tell SEO about the wider cross tube -> Wider tube is not possible * Fix EQ stop at the bottom ? -> This is possible * Takahashi had a discussion with Saito: modify the design of the bottom plate is easier. * #EQ stop design should take into account of the sensor/actuator mounts. * #Use the same sensor/actuator as Type-Bp ? * #Sato-san is responsible for this part. * Dummy payload design for Type-A * Okutomi-kun is assigned. * Okutomi will make schematic design. One of the engineers will make drawings. '''Report more detailed plan by the next week (Takahashi).''' == Common Issues == * Wide OSEM production (Akutsu) * For BS test hanging, we need the wider version by mid-to-late June. * Got cost estimates for the small parts. Will order for 20 OSEMs. * Length sensing OpLev * Discuss in Optics Meeting. * #In order to test this with the BS test haning, we want to have wide OSEMs as witness sensors on the mirror. * #Stab-flag and tipped flag are both in quotation. We will order both. The gluing jigs will be the same. * #Who will design and prepare the BS length sensing OpLev ? -> Ask Simon (Aso) -> in progress * #What shall we do with PR2 * PR2 chamber has only one viewport avaibale at 45deg. angle for OpLev * Original idea: Put a reflecting mirror on the bread board and monitor the rotation of the bread board with another OpLev. * No length sensing * Two OpLevs needed * Another idea: Introduce the light with a fiber into the vacuum chamber to form a one-way 45deg. OpLev for length sensing. * Length sensing possible * Affected by the vacuum chamber tilt (if we mount the fiber collimator to the inner frame, the tilt will be less). * Need to find a place to mount the fiber collimator inside the vacuum chamber * '''See if we can find any mounting point on the inner frame (Akutsu) by the next next VIS meeting.''' === Electronics === * What are necessary in the next few weeks ? * We need to count the number of necessary circuits for Type-A and Type-Bp, so that we can tell AEL the total number necessary for VIS. * '''Make a list by the end of May (Shoda, Takahashi) -> [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5193|List]] ''' * Presented the list to AEL. Miyakawa-san agreed. * Need to update the list to include IMMT * Discuss how many spares to make at the next AEL meeting * Watch dog system (Tanaka) * Wants to do tests with the existing PR3 sometime in fall ? Need coordination. * photo-MOS relay switch resistance fluctuation * '''Noise requirement for the resistance fluctuation is necessary (Aso) ''' * Tanaka measured the photo-MOS relay resistance fluctuation-> 37mOhm RMS upper limit * Will make spectrum of the resistance fluctuation. * '''DC-DC convertor noise check: quiter than a battery ? ''' * '''#The next step: Make a prototype with slow shutdown mechanism''' == Type-B == * [[KAGRA/Subgroups/VIS/TypeB]] * [[https://onedrive.live.com/redir?resid=D5CCFA70A378E0D0!185&authkey=!AGcFDradxzrNJ00&ithint=folder,txt|Task list/schedule]] * Past Week Summary * Fabian did inventory of parts/fasteners for dummy BS, RM, IM and IRM - almost all at Mitaka. A handful (picos, pico drivers) will be brought back from Kamioka. * Fabian continued work on Mathematica and Matlab models of the BS and control system. He now gets much better agreement after correcting discrepancies between the parameter sets. * Hirata-san worked on: * Checking Mirapro assembly frame drawings * Ordering missing screws and small items (screws for dummy mass, fine pitch M8 for RM) * Work platforms and clean booth second floor arrangement. * [[attachment:BS assembling hanging frame 吊り枠_ver2.pdf|Load gauge adapter]] and associated parts * Possible fall-back plans for the rods connecting the security structure to the PI. * Design for additional IM trim masses (existing design had one mass per corner and no provision for adding/removing). * Mark worked more on [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4235|E1504235 BS Assembly Procedure]] ([[https://onedrive.live.com/redir?resid=D5CCFA70A378E0D0!195&authkey=!AM_usynuo9QI57g&ithint=folder,webloc|Draft on OneDrive]]) * Mark designed a [[attachment:PI Guide.png|guide part]] to help place the PI accurately onto the security structure. * '''Discussions ''' * Some holes are missing on the bottom of the BF: 4 holes instead of 6 -> less number of the cable cramps * Put multiple cables in one cable cramp. * Check the SF too. * IM assembly * Planning to do it in ATC. Use the clean room used for the SF assembly. * Fabian made an inventory. Most parts are ready. * Wires * Fabian continued analysis of RM wire thickness versus mode frequency: [[https://onedrive.live.com/redir?resid=1447B05D5B571A84!442&authkey=!AKrjBW2W8vMKyAY&ithint=file,pdf|link]], [[https://onedrive.live.com/redir?resid=1447B05D5B571A84!421&authkey=!ALZY-tFtMCYI9Pw&ithint=file,pdf|another link]],[[https://pfalig.bn1301.livefilestore.com/y3mT7oHnuBfD9_7Ata6H90opTVY5IIIm78MQ8Rl-lChfSUtGhGiEP-mlB1rQuzliimi-pmL1JfYTKCUY_Tgan0Bfa2jq5EeSXWiCracw_5ulsm2iuf6RHJcz0ot34DaeWqdUjFnU6fILnyau69WFkBmUcTwfGYBNwSrs27eyK-jc90/RM_wire.pdf?psid=1|yet another link]] (From last week: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5106|T1605106]] /[[https://onedrive.live.com/view.aspx?resid=1447B05D5B571A84!354&ithint=file,docx&app=Word&authkey=!AO5CHNP3xlO5RjY|draft]]) * Can we make SR wire breakers bigger? * Fukushima-san preparing test: 3/4/2016 + "1 month" = ≈4/1/2016, not ready as of 4/8.-> Takahashi will ask the status. * Flags, Metal Prisms * IM and BS flags and metal prisms ordered; expected 5/31 * Sapphire Prisms - expected 6/5 * BS dummy optic RECEIVED * Mirror box (Tatsumi) * Tatsumi-san has ordered modifications to mirror box for final flags and prisms. * An extra structure attached to the EQ stop to prevent tipping over of the BS. * Will consider if we can make it to the test hanging. But not critical for the test hanging. * No action since last week. * Not enough crane height problem (Hirata, Saito) * No action since last week * EQ stop screws, extensions and lock nuts (in manufacture - promised for 4/22) * Ballast masses for payload * Initial batch received - need to design and order smaller ones to allow for adjustments * Lower breadboard stuff * Breadboard spring bases and associated cable clamps RECEIVED * Breadboard springs (in manufacture) * Damper ring mods RECEIVED * Nail-head parts: quote from Mirapro received, not urgent, will be combined with assembly frame order. * BS Assembly Frame Design (Mark, Hirata) * Hirata-san did new Inventor assembly with Mirapro's initial design plus various improvements including clean bag supports. * Clean bag * Ordered - expected 6/8. * 2D and 3D CAD * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5035|E1605035 VIS Document and Drawing Tree (BS)]] * BS 3D Assembly * Load frame adapter added * Electronics * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3600|JGW-D1503600 - BS Suspension Cabling]] * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5111|E1605111 BS Suspension Electronic Items List]] * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3901|D1503901 In-Vacuum Cable Detail]] * Item list and timetable was given to Miyakawa-san - some corrections received and added to schematic but not yet posted. * Status on AEL boxes OK according to Miyakawa-san. * Signal generator and cable to be used for BS test. May order NIKHEF cards later if concern about AC-driven units in racks. * Need to get new longer versions of some previously ordered BF-PI and SF-PI cables (Takahashi). * Need to check previously ordered TM-BF and IM-BF OSEM cables have been flipped (Takahashi). * Decided to hand-make cables for geophones because previously ordered cables have no conductor on pin 5. * Stepper drive box (requested by Sekiguchi-san [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3385|T1503385]]) is being designed, should be ready in time. * Procedure documents * Mark worked on BS Assembly Procedure [[https://onedrive.live.com/redir?resid=D5CCFA70A378E0D0!195&authkey=!AM_usynuo9QI57g&ithint=folder,webloc|E1504235 draft]] == Type A == * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4792|Task list]] (Takahashi) * Clean booth design for 2F https://www.dropbox.com/s/8bi9ij91radmpt5/IXYV160512.pdf?dl=0 * Ask Miyoki-san to add cable racks * Prototype test of the EQ stop * Will do the test in ATC * EQ stop and assembly frame prototype were shipped to Mitaka * Will start the preparation from the next * Sensors to monitor the release of the SFs from the EQ stop. * Now considering to use some touch sensors * Will test this sensor in the prototype test * #The test of prototype long maraging rod was finished * Will order them with maraging rods for the cryogenic payload early July. The lead time is 2 months. * Type-B Standard Filters preparation * 6th SF measurements were done ? * Shipped the SF for BS to Mitaka. * Ship the measured SFs to Kamioka at an apropriate time * Type-A SF preparation * Needs to cut more finshing rod blades -> ATC is working on it now. * The next Type-A meeting will be on 5/26. * Simultion (Okutomi) * #Local sensors for BF == Type-Bp modification == * Modification for bKAGRA * wiki * Discussing with Saito-san of ATC * Specified what can be modified * Asked to fix the EQ stop to the traverser * Asked Fujii-kun to work on the noise requirements for the BF sensor/actuator * Still waiting for the LVDT design from Virgo * Full CAD model of the original Type-Bp needs to be created == Site work plan for the next week == * Mon: IP * Tue: IP * Wed: IP * Thu: IP * Fri: IP == Travel Plans == * Travel (Week of 5/23) * Takahashi: * Shoda:Elba * Mark: * Fabian: * Okutomi:Elba * Fujii: 23-27 (Accelerometer, PR3) * Ishizaki: * Hirata: * Ohishi: * Sato: Wed-Fri (Acceleromter) * Travel (Week of 5/30): * Takahashi: * Shoda: * Mark: * Fabian: * Okutomi: * Fujii: * Ishizaki: * Hirata: * Ohishi: Mark is away: July 8-20 == Other == * Safety:no incident * #GAS blade inspection by Virgo (Takahashi) * Shipped the blades. Will get results in 1-2 months. == Next meeting == 2016/5/27(Fri) 13:30 -