Terry Kammash - NASA's Institute for Advanced Concepts

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Comparison withSimulationImages:Contrast enhanced RCF images of proton beam profiles after a drift of 5 cm from targetexit from experiments with 13 microns of Mylar (a) top left, and 12.5 microns ofaluminum (b) bottom left. Compare an electron beam profile from a simulation (c) by L.Gremillet, et al. [Phys. Plasmas 9, 941(2002)], showing the transverse electron profilejb/enc at 20 microns inside a silica target <strong>for</strong> a propagating monoenergetic electron beamof energy 500 keV, after 405 fs of propagation, which is also the beam duration. Imagereproduced with permission.Observed profilesSilicae-beam simulation
Magnetic Field from Simulation vs.Proton Beam ProfileAnd as shown byM. Honda, J. Meyer-ter-Vehnand A. Pukov, PRL 85 2128(2000) the ions can follow theelectron filaments in as littleas 60 fs.E field configurationplot from the simulationat 405 fs. Notice thesimilarities in thesimulation slices toproton beam images inrow (I) of the previousslide.e-beam induced B fieldevolution is very similar tothat of the proton beamprofile seen from Mylarpreviously.
Page 1 and 2: Ultrafast Laser-DrivenPlasma for Sp
Page 3 and 4: Front Surface Deuteron Acceleration
Page 5 and 6: Material Effect on ProtonProduction
Page 7: (a) 4 µm, (b) 12.5 µm, (c) 25 µm
Page 11 and 12: Protons From Front Surface1614Maxim
Page 13 and 14: Deuteron AccelerationDeuteron coati
Page 15 and 16: Peak Proton Energyvs. Spot Size6000
Page 17 and 18: Spot Size Comparison120Total Intens
Page 19 and 20: Plume Evolution in 1 Torr H 2Ambien
Page 21 and 22: Target GeometryWire orientation:~10
Page 23 and 24: Proton RadiographyThin Film TargetT
Page 25 and 26: Proton Acceleration Summary• Simu
Page 27 and 28: Physics ContinuedEnergy conservatio
Page 29 and 30: ContinuedThe Ion EnergyE i =ZE b =Z
Page 31 and 32: Two Asymptotic Regimes forIon Accel
Page 33 and 34: Relationship Between Ion Energy,Las
Page 35 and 36: An ExampleI=10 21 W/cm 2η=0.10R=2.
Page 37 and 38: Plasma Expansion in VacuumIon accel
Page 39 and 40: Accomplishments Thus Far1. Generate
Page 41 and 42: Accomplishments Thus Far4. Experime

Terry Kammash - NASA's Institute for Advanced Concepts

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