advanced virgo 帰朝報告granite.phys.s.u-tokyo.ac.jp/knagano/presentation/...figure 11.1: the...
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AdvancedVirgo帰朝報告(ReportonAdvancedVirgostay)
宇宙線研究所 重力波観測研施設東京大学 大学院理学系研究科 物理学専攻
KAGRAObservatory,ICRR,theUniversityofTokyo長野 晃士(NAGANOKoji)
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 1
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 2
• FromJun.8thtoJul.1st,Enomoto-kunandIstayedinPisa,ItalytojoincommissioningworkofAdvancedVirgo.
• Inthistalk,Iwillreportourstay.• Atfirst,outlineofAdvancedVirgowillbeintroduced.
• Then,Iwilltalkaboutwhatwedidinourstay.• Finally,IwillshowtherecentprogressofAdvancedVirgoaWerweleW.
Abstract
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 3
1. WhatisAdvancedVirgo?2. WhatwedidinAdvancedVirgo3. RecentprogressofAdvancedVirgo
Outline
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 4
• AdvancedVirgo(NOTVIRGO)isaninterferometernamelikeKAGRA(LCGT?)andisabbreviatedasAdV(NOTaVirgo).– VirgoisnotVIRGOsinceitisnotacronymunlikeLIGO.
• AdVishostedbyItalyandFranceandlocatedinPisa,Italy.
• HostinsHtuteisEuropeanGravitaHonalObservatory(EGO).
• AdVisa2GGWdetectorwhichhas3-kmarms.
WhatisAdvancedVirgo?
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 5
WhereisAdvancedVirgo?
Pisacity
Nearestairport
AdvancedVirgo
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 6
WhereisAdvancedVirgo?
Pisacity
Nearestairport
OuraccommodaHon
AdvancedVirgo
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 9
AdvancedVirgofeatures
Notusedfornow(butinstalledforbeamreducing)
PhotodiodenameforGWsignal
AdVfeatures・PRCandSRCarenotfolded.=NoPR2(3)norSR2(3).・TandemOMCs.・OMCsarefixedonsuspendedbench(SDB1)withOMMTs,OFI,andsoon.・RFCisaWerIMC.
RFC
Westa
rm(3
km)
Northarm(3km)
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 10
• HowtolockAdV(PRFPMIwithDCreadout)?1. LockIMCandRFC.(IniHally,PRMismisaligned.)2. LockbotharmsusingthetransmiaedlightwithPDH
method.(AdVdoesnothavegreenlocksystem.)3. LockMICHatmidfringewithDCsignal.4. AlignPRMandlockPRCwithlowfinessesinceMICHhas
just50%reflecHvity(midfringe).5. ReduceMICHoffsetandlockMICHatdarkfringeusing
PDHmethod.6. SwitchonthefrequencystabilizaHonsystemwithCARM.
ThissystemiscalledasSSFS(SecondStageFrequencyStabilizaHon).
7. LockOMCs.8. LightreachesB1PDanditoutputsdifferenHalmode
signal.FinallythesignalisfedbacktoDARMandIFOreachedlownoisemode.
LockacquisiHonofAdV
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 11
OpHcallayout
8
Interferometer Layout: Beams and Benches
Advanced Virgo TDR VIR–0128A–12
SWEB
EWEB1
B8
West End BenchB6PR, B6pPR, B9PR, B9pPR
WEB Tele
EWEB2B4
PO TelescopeescopeB4
B6
B6pIMC
p
B6
EIB
LB
RFC
SIB1
BS
B4
SIB2EIB2
B2B5
RFC
PR BS
SDB2
SDB1
ctionBe
nche
sInjection Benches
EDBDetec
hes
Beams & optical benchesfor Advanced Virgo
Under vacuum benches
External benchesWE
North End Benches
WI
CP
SNEBENEB2
ENEB1
B7
B9
B9p
NI NECP
NEB Telescope
SDB1SR
OMC Mode Matching Telescope
OMCs
ZOOM
B1tB1s2
B1 B1s1
B1pB6DB, B6pDB, B9DB, B9pDB, B5
Figure 7.1: Functional scheme of the ITF beams and the optical benches foreseen for Advanced Virgo.
236
Several beams are extracted from the detector to measure the position and orientation of the mirrors, the lengths and alignments of the optical cavities, etc.
The photodiodes that measure the laser power in these beams are kept on various in-vacuum optical benches.
B1: from the antisymmetric port of the detector, measured on Suspended Detection Bench 2 (SDB2). This is where the GW signal is measured.
B2: from the symmetric port of the detector (also called the reflected port), the beam reflected by the PR. from Suspended Injection Bench 2 (SIB2).
B4: a small pickoff (180ppm) of the light circulating inside the Power Recycling cavity (PRC). From SPRB.
B7, B8: light transmitted by the north & west arms, on SNEB/SWEB.
D.Hoak,VIR-0442A-17
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 12
OpHcallayout
24
Optical Bench Example: SDB2
FROM BEAMSPLITTER
B1 DC
D.Hoak,VIR-0442A-17SDB1
OMCs
OFI
OMMT1
OMMT2
OMML
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 13
SuspensionsystemsinAdV
15
The Virgo SuspensionsAdvanced Virgo TDR VIR–0128A–12
Figure 11.1: The Virgo superattenuator: the mechanical filter chain adopted to attenuate seismicvibration in the detection band, the three-leg inverted pendulum preisolator, the top filter of the chain (F0)and the payload are well visible. The inertial damping acts on the top stage to compensate tidal motionand any slow drift motion so that to reduce the mirror swinging within the detection bandwidth (above 10Hz).
418
Superattenuators are used to suppress ground motion and control the position for the large optics: PR, BS, WI, NI, WE, and NE, plus the MC end mirror.
The PR suspension also includes the pick-off plate (POP), attached to the “filter 7” (F7) module. The NI and WI suspensions support compensation plates (CP), also attached to F7.
The position of the upper stages is measured using LVDTs.
The two lowest stages of the suspension are the marionette (MAR) and the mirror (MIR).
The position and orientation of these stages is measured using optical levers.
D.Hoak,VIR-0442A-17
MCe,SDB1,andSIB1aresuspendedwithshortSAs.
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 15
• AdVdigitalsystemisdifferentfromLIGOone,whichKAGRAimport.
• Tools– DataDisplay:monitordata(fastandslow,realHmeandpast)inseveralstyles,suchasHmeseries,FFT,coherence,spectrogram,andsoon.
– VIM(VirgoInterferometerMonitor):WebbasedtoolsummarizingtheIFOperformanceandenvironmentalmonitordatadaybyday.(Seetheactualpage.)
– BruCo:showthetop20channelswhichhavecoherencewithDARM(oranychannelyouchoose)automaHcallyforeveryfrequencyband.
– (DBofknownlines:listedtheknownline,e.g.calib.line.ThismightbeveryusefulbutwasunderpreparaHonyet.)
– Andmanyothers;DataQualitySegmentDatabase(DQSEGDB),NoEMi,BRMSMon,Omicron,andsoon.
Digitalsystemandtools
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 17
• Manyenvironmentalmonitorshadbeeninstalled.
Environmentalmonitors
Buildingsmonitoring(CEB,NEB,WEB,MCB)• 13D-Seismometer(Guralp)upto100Hz
• 3Magnetometers(W,N,Ver$cal)
• 1infrasoundMicrophone
• 1RFantennareceiver(demod.atVirgoRFfrequencies)
• MainsVoltagemonitors(IPSandUPS)
• MainsCurrentmonitor(IPSandUPS)
V1:ENV*fast(1kHz÷20kHz)channels
15
In-airBenchesmonitoring(EIB,LB,2TCS,EDB,EMCB,nextSQZ)• Accelerometer(kHzrange)
• 3D-seismometer(upto100Hz)
• Microphone(standard)
Vacuumtanksmonitoring(eachTower(10),eachCryogenicTrap(6),someintra-towerslinks)
• Accelerometer(kHzrange)• 1Dseismometer(<100Hzrange)
17/06/21 I.Fiori-DetCharTraining-SpectralNoise
I.Fiori,VIR-0471A-17
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 18
• Manyenvironmentalmonitorshadbeeninstalled.
Environmentalmonitors
• EachBuilding
– Temperature(probesat2,4,8,10mheight)– Pressure– Humidity
• IJNandDETlabs– Temperature
• EachTowerandMinitower
– Temperatureprobes,in-vac,ateachSAfilter
• ExternalBenches– TemperatureandHumidity
• WeatherSta]on(onControlBuilding)• Lightningdetector(s$llmissing)planjoining
www.blitzortung.org
V1:ENV*slow(1Hz)channels
17/06/21 16I.Fiori-DetCharTraining-SpectralNoise
I.Fiori,VIR-0471A-17
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 19
• Firststablelockwith“full”interferometer,i.e.withoutSR,hadbeenachievedinMar.2017.Inotherwords,installaHonandintegraHonphasehasbeenfinished.
• Thus,theystartedcommissioningtoimprovetheinterferometerstabilityandsensiHvity.– BothofthemareimportantforGWnetwork.
• Manyworkscanbeperformedfromacontrolroom.
Whatweredidbeforeoutstay?
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 21
• Theirmid-termgoalwas20MpcinBNSinspiralrangetojoinO2.
• Toachievethisgoal,manyworksweredoneaWerthefirstlock.
• Then…
Whatweredidbeforeoutstay?
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 22
Whatweredidbeforeoutstay?
A.Rocchi,VIR-0418A-17
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 23
• SensiHvityofAdVonJun.17th.
Whatweredidbeforeoutstay?
Large50Hz“line”noise
ManylinesinGWband Excessagainstshotnoise
FromVIMpage
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 24
1. WhatisAdvancedVirgo?2. WhatwedidinAdvancedVirgo3. RecentprogressofAdvancedVirgo
Outline
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 25
• 期間:6月8日から7月1日• 財源:(旅費)拠点形成、(レンタカー代)EGO• 目的:AdvancedVirgoのコミッショニング作業
に参加・貢献して名前を売ること。そして、KAGRAの今後のコミッショニングに活かせるような技術を習得すること。
• その他:昼食は、毎日サイト内の食堂で食べる。(我々の場合は)昼食代はEGOが出してくれた。すごく美味しいかった。あとは、昼休みには卓球をしていた。
出張の概要
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 27
Outlineofourstay
ER11a
ER11bER11a
ER11b
Arrival
Departure
StudyaboutAdVandhowtouseitstools.
InvesHgaHonofSDB1scaaering
InvesHgaHonofshot-noise-likenoisebetween1kand3kHzband
InvesHgaHonofthecorrelaHonbetweenSSFSandDARM.
InvesHgaHonofSDB1scaaering
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 28
• Asyoucansee,thereweremanylinesandstructuresinDARMbetween100and1kHz.
• ThesenoisewereconsideredtocomefromSDB1(orSDB2,wherePDsareplaced).
• ThiswasbecauseSDB1wasverycrowdedandwecouldseemanybrightspotswithIRcamera.
Scaaeringlightproblem
ここに感度曲線
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 29
Scaaeringlightproblem
log#32001
• PicturesofSDB1
log#38039
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 30
• Beforewearrived,injecHontestintoSDB2wasdone.SothenextstepwasSDB1invesHgaHon.
• Whatweredone:– ShakeSDBxwithwhitesignalorslowcertainfrequencysignaltoseeifanyexcessnoiseappearinDARM.
– Monitorthebrightspotsduringshaking.– Andmanyothers
Scaaeringlightproblem
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 31
Scaaeringlightproblem
• SlowinjecHonresult • BroadbandinjecHonresult
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 32
Scaaeringlightproblem
• SlowinjecHonresult • BroadbandinjecHonresult
MagnitudeindicatesthereflecHvityofthescaaerer
Cut-offfrequencyindicatestheamplitudeofmoHon
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 33
• ThisinjecHontestimpliedthatthenoisecouplingwithsomeresonanceonSDB1mightbeproblemwhilethenoisecouplingwiththeslowmoHonoftheSDB1wassmallerthanthecurrentsensiHvitybyafactorof10.
• NextquesHonis,wheredoesthelightwhichmakethenoisecouplingwithSDB1moHoncomefrom?
• ToidenHfytheoriginofthelight,sensiHviHeswithfullIFOandwithsimpleMichelsonwerecompared.(Thisstudywasdonebeforeourarrival.)
Scaaeringlightproblem
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 34
Scaaeringlightproblem
102 10310−9
10−8
10−7
10−6
10−5
Frequency, Hz
RIN
, 1/H
z1/2
Full LockSimple MIDark noiseShot noise
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 35
• Asaresult,weconcludedthatthescaaeredlightcamefromsomewhereinPRCandmadethemanylinesandstructuresinDARM.
• Fromthisstudy,weleanedthatdealingwithsca3eringisveryveryimportantfortheinterferometersensi9vity.
• Bytheway,moreinvesHgaHonsaWerweleWrevealedthatourconclusionwasnotperfect.
• Thisstorywillbetoldlater.
Scaaeringlightproblem
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 36
• Asaresult,weconcludedthatthescaaeredlightcamefromsomewhereinPRCandmadethemanylinesandstructuresinDARM.
• Fromthisstudy,weleanedthatdealingwithsca3eringisveryveryimportantfortheinterferometersensi9vity.
• Bytheway,moreinvesHgaHonsaWerweleWrevealedthatourconclusionwasnotperfect.
• Thisstorywillbetoldlater.
Scaaeringlightproblem
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 37
Outlineofourstay
ER11a
ER11bER11a
ER11b
Arrival
Departure
StudyaboutAdVandhowtouseitstools.
InvesHgaHonofSDB1scaaering
InvesHgaHonofshot-noise-likenoisebetween1kand3kHzband
InvesHgaHonofthecorrelaHonbetweenSSFSandDARM.
InvesHgaHonofSDB1scaaering
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 38
• AWerER11a,IfoundthatsomestructuresinDARMandMICHduringER11aappearedanddisappearedsimultaneouslylockbylock.
CorrelaHonbetweenMICHandDARM
ここにスペクトログラムとFFT
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 40
• TheirshapeintheFFTseemedtobesimilartothatofSSFS.
• Enomoto-kunfoundthattheseshapewasalsosimilartothesuspendedinjecHonbench1(SIB1)localcontrolsignal.Also,Ifoundthatitisalsosimilartosomemagnetometersignals.
• ThisindicatedthattheSIB1moHonisexcitedbymagneHcfieldthroughelectro-magneHcactuatoronSIB1.
CorrelaHonbetweenMICHandDARM
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 42
• AbovethingssuggestedthatthestructuresweregeneratedbyfrequencynoiserelatedwithSSFSloopand/orbeamjiaernoise.
• ThesenoisearerelatedwithMICHasymmetrywhichcanberelatedwithalignmentperformance.– WetriedtoidenHfyspecificIFOparameterrelatedwiththisnoise.However,wecouldnot.
• Thustheappearing/disappearingbehaviorcanmakesense.
• Fromthisstudy,weleanedthatenvironmentalmonitorswereveryhelpfultoiden9fythenoisesources.
CorrelaHonbetweenMICHandDARM
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 43
Outlineofourstay
ER11a
ER11bER11a
ER11b
Arrival
Departure
StudyaboutAdVandhowtouseitstools.
InvesHgaHonofSDB1scaaering
InvesHgaHonofshot-noise-likenoisebetween1kand3kHzband
InvesHgaHonofthecorrelaHonbetweenSSFSandDARM.
InvesHgaHonofSDB1scaaering
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 44
• Atfirstglance,thesensiHvityseemedtobelimitedbyshotnoisebetween1kand3kHz.
• However,thenoiseexceededshotnoiselevelesHmatedwithlaserpowerbyafactorof1.4.
• ToidenHfythesourceoftheexcessnoise,wemeasuredcrossspectraofthetwoB1PDs.– Bytheway,oneofthemdidnotworkwhenwearrivedsinceithadbeenburnedbytoomuchpower.
– ThePDwasreplacedbeforeER11bbynewone.– Thisstorytellsusthatbeamshu3ersandsparesofPD(andanyotherinstruments)areimportant.
– Infact,thenewPDwasburnedagainbecauseofthewrongbeamshuaerserng.
Shot-noise-likenoiseabove1kHz
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 45
• WhathappeninthecrossspectraoftheoutputPDs?– IfthesensiHvityislimitedbythenoisefrombrightport(e.g.frequencynoise)andshotnoise,thenoiseswillbereduced.
– Asaresult,thespectrarevealthelevelofthehiddenclassicalnoisesinthegravitaHonalwavechannel.
– Fordetail,pleaseseeD.V.Martynovet.al.,“QuantumcorrelaHonmeasurementsininterferometricgravitaHonalwavedetectors”,PRL?(2017).
Shot-noise-likenoiseabove1kHz
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 46
• SpectraldensityofDARM(withoutcalibraHon)
Shot-noise-likenoiseabove1kHz
OriginalsensiHvity
Noisereduced“sensiHvity”
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 47
• ThisfigureindicatesthatthesensiHvityislimitedbynoisefromBP,maybelaserfrequencynoise,andcanbeimprovedwhenthealignmentisimproved.
• However,evenifthealignmentwouldbeperfect,thesensiHvitycouldnotreachshotnoiselevelandbelimitedbysomeclassicalnoise.– ThespecificnoisessourcewasnotidenHfied.
• Fromthisstudy,weleanedthattwoPDsa@erOMCmustexistfornoisestudy,redundancy,andconfirmingifthePDsworkswell.(WeneedTWOPDsaWerOMC!!)
Shot-noise-likenoiseabove1kHz
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 48
• OtherinteresHngthingsduringourstaywerelistedbelow:– 50Hzlineincreaseanddecrease– MovinglineinvesHgaHon– Engineeringrun11– …
OtherinteresHngthings
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 49
• WhencablingaroundBSwasmodified,50Hznoisegotworsebyafactorof40.
• Thisnoisewasreducedwhenthecablewasjustunpluggedandplugged.
50Hznoiseincreased
log#38010
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 50
• Whensomedevicewasturnedoff,50Hznoisewasreduced.
Switchofftest
log#38261
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 51
MovinglineinvesHgaHon
I.Fiori,VIR-0540A-17
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 52
1. WhatisAdvancedVirgo?2. WhatwedidinAdvancedVirgo3. RecentprogressofAdvancedVirgo
Outline
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 53
• WhenweleWAdV,BNRofAdVwasabout10Mpc.
• AWerweleW,manyworksweredone.
• Asaresult,BNRofAdVreached20Mpc,whichwasamid-termgoaltojoinO2,wasachieved.
• Therefore,AdVjoinedO2from1stAug..
• Inthenextafewslides,someworksaWerourstaywillshown.
RecentprogressofAdV
Ourstay
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 54
• AsIsaid,scaaeringinPRCmightbeproblem.• Thus,someinvesHgaHonsweredoneanditwasfoundthatB4ghostlightmightbeaproblem.– B4isaPDinPRCobservingMICHandCARMsignal.
B4ghostlightscaaering
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 55
B4ghostlightscaaeringI.Fiori,VIR-0540A-17
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 56
• ThescaaeringlightaffectedthesensiHvitytosomeextent.
• However,whatimprovedthesensiHvityto20Mpcwasnotrelatedwiththescaaering.
• TheimprovementisduetotheupgradeoftheDAQboxesandADCsfirmware,allowingforrunningat1MHzandimprovingtheanH-aliasingfilters(logbook#38596).
DAQboxesandADCsupdate
ExtendedUchiyamaLab.meeHng(UniversityofToyama,4thAug.2017) 59
• CommissioningwasveryinteresHng!
Conclusions