Terry Kammash - NASA's Institute for Advanced Concepts

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Ion VelocitiesMaxium Ion Velocities:Isothermal v max =2C S ln(d/h)Adiabatic v max =2√2C S ln(d/h)Note in both instances:Ion Acceleration is more efficientwhen(d/h)>>1i.e. <strong>for</strong> larger focal spots
Relationship Between Ion Energy,Laser and Target ParametersConsider power balance between laser andejected electrons:[n b (γ b -1)m o c 2 ]c=ηIWhereη=Efficiency of energy transferRewrites asε e =ηI/n b cAlso electron must exceed Coulomb Energy topenetrate the target i.e.n b = ε e /(πe 2 hR)
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 and 8: (a) 4 µm, (b) 12.5 µm, (c) 25 µm
Page 9 and 10: Magnetic Field from Simulation vs.P
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: Two Asymptotic Regimes forIon Accel
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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