Oswald WilliHeinrich-Heine Universitt, Dsseldorf GermanyEuroNNAC workshop4.Mai 2011Laser driven particle acceleration

Oswald Willi

OutlineArcturus Laser FacilityMotivation and objectivesApplicationsPossibilities for open access

Present Arcturus Laser SystemOscillator (Femto)Booster

(~104 gain)GratingStretcher (~ 600 ps)Regenerative AmplifierPower Amplifier 1Power Amplifier 2APower Amplifier 3A

(beam 1)2 JPower Amplifier 3B

(beam 2) Vac. Compr.200TWVac. Compr.100TW5 nJ25 mJ5mJ1 mJ20 mJ150 mJ350 mJ6 J120 mJ80 nm BandwidthPower Amplifier 2B16J1J500 mJ100 mJVac. Compr.3TW7 mJ15 mJ3.2 J8J

Present laser specificationsBeam 1 100 TW, 25 fs Plasma MirrorBeam 2 200 TW 30 fsBeam 3 3 TW 30 fsAll beams optical synchronized

Beam 1Beam 2 Beam 3Energybeforecompression3.2 J6 J100 mJpulse durationis variable >25 fs>30 fs>30 fsOptionsadaptive mirrorplasma mirror10Hzadaptive mirror

10Hz2w

10Hz

Arbeitsplan fr den Projektzeitraum Januar - Dezember 2009Dsseldorf Arcturus Laser Facility27 meters1 GeV e-

80 MeV p

Arbeitsplan fr den Projektzeitraum Januar - Dezember 2009Beamlines and target chambers

Laser specifications at the end of 2011Beam 1 100 TW, 25 fs Plasma MirrorBeam 2 200 TW 30 fsBeam 3 3 TW 30 fsAll beams optical synchronized

Beam 1Beam 2 Beam 3Energybeforecompression6 J6 J100 mJpulse durationis variable >25 fs>30 fs>30 fsOptionsadaptive mirrorplasma mirroradaptive mirror2wPower200 TW200 TW3 TWXPW systemfor contrastenhancement

Topics investigated using the Arcturus laser

HHG Behmke et. al., PRL (2011)Proton acceleration dependent on target size Toncian et al., PoP (2011)Spin polarisation of protons Bscher et al., SPIN Physics Symposium, (2010)Channel formation Willi et al. Plasma Phys. Control. Fusion (2009) Absorption measaurements on sturctured tsrgets Cerchez et al., to be publishedElectron acceleration

Topics investigated at national and international facilities

National collaborations (MBI group in Berlin)International collaborations (M. Borghesi (Belfast) and J. Fuchs (LULI)) Ion acceleration from microspheres: T. Sokollik et al., PRL (2009) -cover page of PRL Laser beam filamentation: G. Sarri et al., PRL (2011) Magnetized soliton remnants: L. Romagnani et al., PRL (2010) Proton production: S. Buffechoux et al., PRL (2010) Laser-driven ultrafast field propagation: K. Quinn et al., PRL (2009) Plasma jets: S. Kar et al., PRL (2008) Observation of collisionless shocks: L. Romagnani et al., PRL (2008) Laser driven micro-lens: T. Toncian et al., Science (2006)

Motivation and goals for electron accelerationIn progress Optimization of laser parameters for LWFA (small energy bandwidth, stability, divergence etc.) experimental validation of scaling lawsLonger term multi-beam applications: multi-stage acceleration (B. Hidding et al., PRL 104, (2010)) e- beams as seeder for classical accelerators beam driven wakefields with unique features due to short e-bunches Thomson scattering

The LaboratoryThe bubble regimePukhov, Meyer-ter-Vehn 2002Directly accessible for our parameters:Arcturus Well above bubble threshold!ifthenBubble scaling predictions: Gordienko/Pukhov, PoP 12 (2005)= 30 TW

Electron acceleration with Arcturus laser:1.9J, 40fsTheor. prediction using Pukhovs scaling law (Gordienko/Pukhov, PoP (2005)): 375MeV

Simultaneous SPIDER / electron measurements

Focus 300m in front of gas jet entranceFocus directly on gas jet entrance

Gas cell setup

Reproducibility studies using Arcturus 86 MeV

110 MeV

250 MeVSample shot collection on the gas cell (non consecutive, 50% of shots hit the aperture)5MeV

30MeV

70MeV110MeV

Pointing stability and beam divergence

Betatron radiation: Spectral characterisation

Betatron radiation: Source size

ApplicationsGeneration ultra-short X-ray sources: Thomson scattering Space radiation studies

Thomson scattering

Flying mirror on thin foil targets

Space radiation studiesTypical e- flux in the van-Allen beltEasily producible thermal spectrum from an LPA (simulation)B. Hidding, et al., Deutsche Patentanmeldung 10 2010010716.6 (2010)B. Hidding, et al. NIMPR 636, 31 (2011)ESA and university funding B. Hidding

Possibilities for open accessAs an university we can offer time at the facility at any timeExperiments should however be carried out on a collaborative basis

Funding and networks

Transregional Collaborative Research Centre SFB/TR18 (DFG)Graduate school GRK1203 (DFG)Graduate school HITEC (HG)(Dsseldorf, Jena, LMU, MPQ and MBI)(It is a 12 year programme which started in 2004 and is assessed after every 4 years)(Dsseldorf and Jlich)

(It is a 9 year programme with one assessment)

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