Advanced Virgo 帰朝報告granite.phys.s.u-tokyo.ac.jp/knagano/presentation/...Figure 11.1: The Virgo superattenuator: the mechanical ﬁlter chain adoptedtoattenuateseismic vibration

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


•  FromJun.8thtoJul.1st,Enomoto-kunandIstayedinPisa,ItalytojoincommissioningworkofAdvancedVirgo.

•  Inthistalk,Iwillreportourstay.•  Atfirst,outlineofAdvancedVirgowillbeintroduced.

•  Then,Iwilltalkaboutwhatwedidinourstay.•  Finally,IwillshowtherecentprogressofAdvancedVirgoaWerweleW.

Abstract


1.  WhatisAdvancedVirgo?2.  WhatwedidinAdvancedVirgo3.  RecentprogressofAdvancedVirgo

Outline


•  AdvancedVirgo(NOTVIRGO)isaninterferometernamelikeKAGRA(LCGT?)andisabbreviatedasAdV(NOTaVirgo).– VirgoisnotVIRGOsinceitisnotacronymunlikeLIGO.

•  AdVishostedbyItalyandFranceandlocatedinPisa,Italy.

•  HostinsHtuteisEuropeanGravitaHonalObservatory(EGO).

•  AdVisa2GGWdetectorwhichhas3-kmarms.

WhatisAdvancedVirgo?


WhereisAdvancedVirgo?

Pisacity

Nearestairport

AdvancedVirgo


WhereisAdvancedVirgo?

Pisacity

Nearestairport

OuraccommodaHon

AdvancedVirgo


OuraccommodaHon


OuraccommodaHon


AdvancedVirgofeatures

Notusedfornow(butinstalledforbeamreducing)

PhotodiodenameforGWsignal

AdVfeatures・PRCandSRCarenotfolded.=NoPR2(3)norSR2(3).・TandemOMCs.・OMCsarefixedonsuspendedbench(SDB1)withOMMTs,OFI,andsoon.・RFCisaWerIMC.

RFC

Westa

rm(3

km)

Northarm(3km)


•  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


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


OpHcallayout

24

Optical Bench Example: SDB2

FROM BEAMSPLITTER

B1 DC

D.Hoak,VIR-0442A-17SDB1

OMCs

OFI

OMMT1

OMMT2

OMML


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.


Superaaenuators


•  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


Suddenstorm


•  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


•  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



•  Firststablelockwith“full”interferometer,i.e.withoutSR,hadbeenachievedinMar.2017.Inotherwords,installaHonandintegraHonphasehasbeenfinished.

•  Thus,theystartedcommissioningtoimprovetheinterferometerstabilityandsensiHvity.– BothofthemareimportantforGWnetwork.

•  Manyworkscanbeperformedfromacontrolroom.

Whatweredidbeforeoutstay?


Controlroom


•  Theirmid-termgoalwas20MpcinBNSinspiralrangetojoinO2.

•  Toachievethisgoal,manyworksweredoneaWerthefirstlock.

•  Then…




A.Rocchi,VIR-0418A-17


•  SensiHvityofAdVonJun.17th.


Large50Hz“line”noise

ManylinesinGWband Excessagainstshotnoise

FromVIMpage



Outline


•  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


Pingpong


Outlineofourstay

ER11a

ER11bER11a

ER11b

Arrival

Departure

StudyaboutAdVandhowtouseitstools.

InvesHgaHonofSDB1scaaering

InvesHgaHonofshot-noise-likenoisebetween1kand3kHzband

InvesHgaHonofthecorrelaHonbetweenSSFSandDARM.



•  Asyoucansee,thereweremanylinesandstructuresinDARMbetween100and1kHz.

•  ThesenoisewereconsideredtocomefromSDB1(orSDB2,wherePDsareplaced).

•  ThiswasbecauseSDB1wasverycrowdedandwecouldseemanybrightspotswithIRcamera.

Scaaeringlightproblem

ここに感度曲線



log#32001

•  PicturesofSDB1

log#38039


•  Beforewearrived,injecHontestintoSDB2wasdone.SothenextstepwasSDB1invesHgaHon.

•  Whatweredone:– ShakeSDBxwithwhitesignalorslowcertainfrequencysignaltoseeifanyexcessnoiseappearinDARM.

– Monitorthebrightspotsduringshaking.– Andmanyothers




•  SlowinjecHonresult •  BroadbandinjecHonresult



•  SlowinjecHonresult •  BroadbandinjecHonresult

MagnitudeindicatesthereflecHvityofthescaaerer

Cut-offfrequencyindicatestheamplitudeofmoHon


•  ThisinjecHontestimpliedthatthenoisecouplingwithsomeresonanceonSDB1mightbeproblemwhilethenoisecouplingwiththeslowmoHonoftheSDB1wassmallerthanthecurrentsensiHvitybyafactorof10.

•  NextquesHonis,wheredoesthelightwhichmakethenoisecouplingwithSDB1moHoncomefrom?

•  ToidenHfytheoriginofthelight,sensiHviHeswithfullIFOandwithsimpleMichelsonwerecompared.(Thisstudywasdonebeforeourarrival.)




102 10310−9

10−8

10−7

10−6

10−5

Frequency, Hz

RIN

, 1/H

z1/2

Full LockSimple MIDark noiseShot noise


•  Asaresult,weconcludedthatthescaaeredlightcamefromsomewhereinPRCandmadethemanylinesandstructuresinDARM.

•  Fromthisstudy,weleanedthatdealingwithsca3eringisveryveryimportantfortheinterferometersensi9vity.

•  Bytheway,moreinvesHgaHonsaWerweleWrevealedthatourconclusionwasnotperfect.

•  Thisstorywillbetoldlater.



•  Asaresult,weconcludedthatthescaaeredlightcamefromsomewhereinPRCandmadethemanylinesandstructuresinDARM.

•  Fromthisstudy,weleanedthatdealingwithsca3eringisveryveryimportantfortheinterferometersensi9vity.

•  Bytheway,moreinvesHgaHonsaWerweleWrevealedthatourconclusionwasnotperfect.

•  Thisstorywillbetoldlater.



Outlineofourstay

ER11a

ER11bER11a

ER11b

Arrival

Departure







•  AWerER11a,IfoundthatsomestructuresinDARMandMICHduringER11aappearedanddisappearedsimultaneouslylockbylock.

CorrelaHonbetweenMICHandDARM

ここにスペクトログラムとFFT




•  TheirshapeintheFFTseemedtobesimilartothatofSSFS.

•  Enomoto-kunfoundthattheseshapewasalsosimilartothesuspendedinjecHonbench1(SIB1)localcontrolsignal.Also,Ifoundthatitisalsosimilartosomemagnetometersignals.

•  ThisindicatedthattheSIB1moHonisexcitedbymagneHcfieldthroughelectro-magneHcactuatoronSIB1.





•  AbovethingssuggestedthatthestructuresweregeneratedbyfrequencynoiserelatedwithSSFSloopand/orbeamjiaernoise.

•  ThesenoisearerelatedwithMICHasymmetrywhichcanberelatedwithalignmentperformance.– WetriedtoidenHfyspecificIFOparameterrelatedwiththisnoise.However,wecouldnot.

•  Thustheappearing/disappearingbehaviorcanmakesense.

•  Fromthisstudy,weleanedthatenvironmentalmonitorswereveryhelpfultoiden9fythenoisesources.



Outlineofourstay

ER11a

ER11bER11a

ER11b

Arrival

Departure







•  Atfirstglance,thesensiHvityseemedtobelimitedbyshotnoisebetween1kand3kHz.

•  However,thenoiseexceededshotnoiselevelesHmatedwithlaserpowerbyafactorof1.4.

•  ToidenHfythesourceoftheexcessnoise,wemeasuredcrossspectraofthetwoB1PDs.–  Bytheway,oneofthemdidnotworkwhenwearrivedsinceithadbeenburnedbytoomuchpower.

–  ThePDwasreplacedbeforeER11bbynewone.–  Thisstorytellsusthatbeamshu3ersandsparesofPD(andanyotherinstruments)areimportant.

–  Infact,thenewPDwasburnedagainbecauseofthewrongbeamshuaerserng.

Shot-noise-likenoiseabove1kHz


•  WhathappeninthecrossspectraoftheoutputPDs?–  IfthesensiHvityislimitedbythenoisefrombrightport(e.g.frequencynoise)andshotnoise,thenoiseswillbereduced.

– Asaresult,thespectrarevealthelevelofthehiddenclassicalnoisesinthegravitaHonalwavechannel.

–  Fordetail,pleaseseeD.V.Martynovet.al.,“QuantumcorrelaHonmeasurementsininterferometricgravitaHonalwavedetectors”,PRL?(2017).



•  SpectraldensityofDARM(withoutcalibraHon)


OriginalsensiHvity

Noisereduced“sensiHvity”


•  ThisfigureindicatesthatthesensiHvityislimitedbynoisefromBP,maybelaserfrequencynoise,andcanbeimprovedwhenthealignmentisimproved.

•  However,evenifthealignmentwouldbeperfect,thesensiHvitycouldnotreachshotnoiselevelandbelimitedbysomeclassicalnoise.–  ThespecificnoisessourcewasnotidenHfied.

•  Fromthisstudy,weleanedthattwoPDsa@erOMCmustexistfornoisestudy,redundancy,andconfirmingifthePDsworkswell.(WeneedTWOPDsaWerOMC!!)



•  OtherinteresHngthingsduringourstaywerelistedbelow:– 50Hzlineincreaseanddecrease– MovinglineinvesHgaHon– Engineeringrun11– …

OtherinteresHngthings


•  WhencablingaroundBSwasmodified,50Hznoisegotworsebyafactorof40.

•  Thisnoisewasreducedwhenthecablewasjustunpluggedandplugged.

50Hznoiseincreased

log#38010


•  Whensomedevicewasturnedoff,50Hznoisewasreduced.

Switchofftest

log#38261


MovinglineinvesHgaHon




Outline


•  WhenweleWAdV,BNRofAdVwasabout10Mpc.

•  AWerweleW,manyworksweredone.

•  Asaresult,BNRofAdVreached20Mpc,whichwasamid-termgoaltojoinO2,wasachieved.

•  Therefore,AdVjoinedO2from1stAug..

•  Inthenextafewslides,someworksaWerourstaywillshown.

RecentprogressofAdV

Ourstay


•  AsIsaid,scaaeringinPRCmightbeproblem.•  Thus,someinvesHgaHonsweredoneanditwasfoundthatB4ghostlightmightbeaproblem.– B4isaPDinPRCobservingMICHandCARMsignal.

B4ghostlightscaaering


B4ghostlightscaaeringI.Fiori,VIR-0540A-17


•  ThescaaeringlightaffectedthesensiHvitytosomeextent.

•  However,whatimprovedthesensiHvityto20Mpcwasnotrelatedwiththescaaering.

•  TheimprovementisduetotheupgradeoftheDAQboxesandADCsfirmware,allowingforrunningat1MHzandimprovingtheanH-aliasingfilters(logbook#38596).

DAQboxesandADCsupdate


DAQboxesandADCsupdatelog#38596


SensiHvityreaching28Mpc!


•  CommissioningwasveryinteresHng!

Conclusions


OMAKE








Advanced Virgo 帰朝報告granite.phys.s.u-tokyo.ac.jp/knagano/presentation/...Figure 11.1: The Virgo superattenuator: the mechanical ﬁlter chain adoptedtoattenuateseismic vibration

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