starting-up awake run 2 - indico · 2020. 5. 4. · giovanni zevi della porta, cern starting-up...

Starting-upAWAKERun2GiovanniZeviDellaPorta(CERN)

ABPGroupInformationMeeting-23April2020https://indico.cern.ch/event/910513/

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GiovanniZeviDellaPorta,CERN Starting-upAWAKERun2-ABPGroupInformationMeeting

Introduction

• AWAKEteamjoinedBE-ABP-LATinJanuary2020• DetailedintroductionsatLATSectionmeetingonFebruary12• https://indico.cern.ch/event/887365/(12talks!)

• TodayIwillsummarize:• experimentalsetupandRun1results• maingoals/design/timelineofAWAKERun2• focusonruncoordinationanddataacquisitionplansforthemedium-term(2020/2021)

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https://indico.cern.ch/event/887365/


Veryquickreminder:whatisAWAKE?

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Run1achievements,Run2goals

• RUN1:2016-2018:Proof-of-ConceptExperiment.Successfulelectronaccelerationinwakefielddrivenbyaself-modulatedprotonbeam.

• RUN2:2021-…:Accelerateelectronstohighenergies(~10GeV)whilepreservingthebeamqualityanddemonstratethescalabilityinordertohavefirsthighenergyphysicsapplicationsafterRun2.

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ElectronsacceleraYon:19MeVto2GeVProtonbeamself-modulaYon:micro-bunching@plasmafrequency

[plasmadensity]

[e- ene

rgy]

AWAKE

AWAKECollaboration,Nature561,363(2018)


Run1achievements,Run2goals

• RUN1:2016-2018:Proof-of-ConceptExperiment.Successfulelectronaccelerationinwakefielddrivenbyaself-modulatedprotonbeam.

• RUN2:2021-…:Accelerateelectronstohighenergies(~10GeV)whilepreservingthebeamqualityanddemonstratethescalabilityinordertohavefirsthighenergyphysicsapplicationsafterRun2.

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ElectronsacceleraYon:19MeVto2GeVProtonbeamself-modulaYon:micro-bunching@plasmafrequency

[plasmadensity]

[e- ene

rgy]

AWAKE

AWAKECollaboration,Nature561,363(2018)


Electron bunch

Ionising laser pulse

Long proton bunch

Captured electrons

Proton microbunches

Accelerated electrons on the scintillator screen

Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun

Electron source system

20 MeVRF structure

Quadrupoles

Dipole

Dipole

Dipole

Imaging station 1

Imagingstation 2

OTR, CTR screens

Scintillatorscreen

Electronspectrometer

Proton beam

Electron beam

Run1experimentalsetup

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Howdoesitwork?1)LaserionizesRbvapor,formingaplasma2)Rbplasmacreatesmicro-bunchesintheprotonbeam3)Micro-bunchedprotonbeamexcitesplasmawakefields4)Wakefieldsaccelerateandfocuselectrons


Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun


20 MeVRF structure

Quadrupoles

Dipole

Imaging station 1

Imagingstation 2

OTR, CTR screens

Scintillatorscreen

Electronspectrometer

Proton beam

Electron beam

Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun


20 MeVRF structure

Dipole

Dipole

Imaging station 1

OTR, CTR screensProton beam

Electron beam

Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun


20 MeVRF structure

Dipole

Dipole

Proton beam

Electron beam

Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun


20 MeVRF structure

Proton beam

Electron beam

Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun


20 MeVRF structure

Proton beam

Electron beam

Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beam

Laserdump

RF gun


20 MeVRF structure

Proton beam

Electron beam

NEW:higherenergy

NEW

NEW:back-propagating

NEW:densitystep~150MeV

Run2design(*)(**)

(*)simplified(**)workinprogress(needsstudies,simulations…)�7


Motivatingthedesignchanges

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Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beamRF gun


20 MeVRF structure

Imaging station 1Proton beam

Electron beam

Rb flask

10 m Rb Plasma

RF gun


20 MeVRF structure

Electron beam

NEW:higherenergy

NEW



Electron bunch


Long proton bunch

Captured electrons

Proton microbunches


Rb flask

10 m Rb Plasma

Laser beamRF gun


20 MeVRF structure

Dipole

Proton beam

Electron beam

NEW:higherenergy

NEW



• Newelectronbeam:~150MeV,~2mmmradε,~5μmσxy,~60μmσz• 1:Blowoutregime(e-density>>Rbdensity):linearfocusing,εpreservation• 2:Matche-beamtransversepropertiestotheplasma:preserveemittance• 3:Beamloading:tunethecharge/positionofe-beamtoreachsmallδE/E

• 2plasmacells:self-modulationandacceleration• Injecte-beamwhenprotonbeamisalreadyself-modulated(morestable)• Self-modulationcellequippedwithdensitystepstooptimizewakefieldgrowth

• Separatee-beaminthe1stcell• Electronseededself-modulation:seededmodulationisphase-stable,reproducible


Run2timeline

• Full“CostandSchedule”reviewbythebeginningof2021• Preparingforthisreviewisthefocusofmostofthegroup

• Scheduledrivenbyengineeringchallenge:clearingareafrompreviousexperiment(CNGS)• Cost/person-power:cannotstartrightawaytodismantletheRun1setupandbuildthenewone• Continueexperiments,whiledetailsoftheworkareprepared(RP,cost,schedule,feasibility)

• PartoftheprogramcanalreadystartwithamodifiedRun1setup:• Run1(b):2020:runAWAKEwithoutprotonbeam• Run2(a):2021-22-…:runwithprotonbeam,onlystopwhenCNGSclearingcanstart

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electron-seededself-modulation

density-stepplasmacell

newdiagnostics 150MeVe-source/line(prototypeonthesurface)

clearoutCNGSarea

e-acceleration

2ndplasmacell,2ndionisinglaser


Run1(b),2020:AWAKEwithoutprotonbeam

• Standaloneexperimentswithoutprotons• studylaser/plasmaande-/plasmainteractions

• ImproveexistingsetupbasedonexperiencefromRun1andnewideas• re-alignelectrongun,reducetiming-relatedRFjitter,improvespectrometerresolution,improvecontrolofe-beamtrajectory/focusing

• TestnewideasforRun2• axiconfocusingoflaser,machine-learningforbeamoptimization

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Run1(b),2020:runplan(pre-Covid19)

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Denseprogram,butalotofflexibilityinthe2ndpartoftheyearAWAKEis(hopefully)starting-upinnextweeks,sowemightstillpullitoff!


Run2(a),2021:runwithprotonbeam

• AsignificantpartoftheRun2programcanbeset-upandtestedalreadyin2021

• Electronseededself-modulationinthefirstplasmacell• Predictedbysimulation,butnotyetfullyexploredindata(onlyasmall2018sample)• Largephase-spaceexplorationisnecessarytofindbestparameters• Requested12weeksofSPSbeam-time:mostlydedicatedtothis

• Newdiagnostics:severalnewideaswillmakeRun2possible• e-BPMsbasedoncoherentCherenkovdiffractionradiation(possiblyalsobunchlength)

• ResearchandteststakingplaceatCLEAR• Newspectrometercamerasystem(digitalcameraarray)anddataacquisition(BE-BI)• 3Dimagingofmodulatedpbunchwithstreakcameras(x/z+y/z—>x/y/z)

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DataAcquisitionfor2020andbeyond

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• DAQmodelestablishedinAWAKERun1• Manydiagnostics:digitalcameras,BPMs,BTVs,spectrographs,laserenergy…• EventBuilderapplicationcollects/groupsthedatainto“events”and“runs”

• In2020,IwillworkonseveralDAQupgrades,neededfor2021• Digitalcamerasystemsynchronizationimprovements,andnewBE-BIdigitalcameraFESA• “Burstmode”:take10Hzdataforshortperiods• DataQuality:integratebasicDQintotheEventBuilder,toavoidtaking“baddata”


DataAcquisitionfor2020andbeyond

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• DAQmodelestablishedinAWAKERun1• Manydiagnostics:digitalcameras,BPMs,BTVs,spectrographs,laserenergy…• EventBuilderapplicationcollects/groupsthedatainto“events”and“runs”

• In2020,IwillworkonseveralDAQupgrades,neededfor2021• Digitalcamerasystemsynchronizationimprovements,andnewBE-BIdigitalcameraFESA• “Burstmode”:take10Hzdataforshortperiods• DataQuality:integratebasicDQintotheEventBuilder,toavoidtaking“baddata”


Conclusions

• BuildonthesuccessofRun1,withveryambitiousgoalsforRun2• increasee-acceleration,andfocusonbeamqualityandscalability

• Run2includessignificantupgrades(newe-source,newplasmacell,newdiagnostics)andanengineeringchallenge(clearingex-CNGSarea)

• Run2hasseveralphases:• electronseeding,densitystep,facilitymodifications,prototyping,installation,electronacceleration

• Use2020-21tofocusonthefirstphases,basedonamodifiedRun1setup• Atthesametime,workondesign/prototyping/scheduleofthenextphases

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starting-up awake run 2 - indico · 2020. 5. 4. · giovanni zevi della porta, cern starting-up...

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