Terry Kammash - NASA's Institute for Advanced Concepts

More documents

Recommendations

Info

Target Surface GeometryUse a material which will “trap” the laser light, toenhance the generation of hot electrons.Electron Microscopyof LaserBlackMurnane et al. APL 62 (1993) used gratings and clusters,Kulcsar et al. PRL 84 (2000) used metallic “velvet”.Both showed enhanced X-ray yield from enhance electronheating from efficient coupling.100 µm2 µmLaser Spot Size ~ 6 micronsLaserBlack ® is > 96% absorptive at 1 mm.Results:•30 mm Laserblack target ~8.2 MeV•Enhancement in the numberof maximum energy protons•Beam profile does not suffer,regardless of which surfacehas been coated, i.e. noimprinting even from rear-side>1.3MeV31º div.
Proton RadiographyThin Film TargetT-cube LaserProton BeamMeshRadiochromic FilmApproximate RegionSampled by Beam1 mmArea of Image at RightThe possibility exists to use thelaser produced proton beam <strong>for</strong>very small scale imaging or evenlithography.The image on the left is a 5xmagnified proton radiographcaptured on RCF of a mesh with10 micron wires and 30 microngrid spacing.1 mm51.8 lines high
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: Target GeometryWire orientation:~10
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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?