By Thomas Sokollik
ISBN-10: 364215039X
ISBN-13: 9783642150395
Laser-driven proton beams are nonetheless of their infancy yet have already got a few striking attributes in comparison to these produced in traditional accelerators. One such characteristic is the more often than not low beam emittance. this permits very good solution in imaging functions like proton radiography. This thesis describes a unique imaging strategy - the proton streak digital camera - that the writer constructed and primary used to degree either the spatial and temporal evolution of ultra-strong electric fields in laser-driven plasmas. Such investigations are of paramount value for the knowledge of laser-plasma interactions and, hence, for optimization of laser-driven particle acceleration. specifically, the current paintings investigated micrometer-sized round pursuits after laser irradiation. The constrained geometry of plasmas and fields used to be stumbled on to persuade the kinetic power and spatial distribution of sped up ions. this might be proven either in experimental radiography photos and and in numerical simulations, one in every of which used to be chosen for the canopy web page of actual evaluate Letters.
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Investigations of Field Dynamics in Laser Plasmas with Proton Imaging
Laser-driven proton beams are nonetheless of their infancy yet have already got a few amazing attributes in comparison to these produced in traditional accelerators. One such characteristic is the ordinarily low beam emittance. this permits very good answer in imaging purposes like proton radiography. This thesis describes a unique imaging strategy - the proton streak digital camera - that the writer constructed and primary used to degree either the spatial and temporal evolution of ultra-strong electric fields in laser-driven plasmas.
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Audebert, R. Marjoribanks, P. Martin, Plasma mirrors for ultrahigh-intensity optics. Nat. Phys. 3(6), 424–429 (2007) 5. P. Antici, J. Fuchs, E. d’Humieres, E. Lefebvre, M. Borghesi, E. A. Cecchetti, S. Gaillard, L. Romagnani, Y. Sentoku, T. Toncian, O. Willi, P. Audebert, H. Pepin, Energetic protons generated by ultrahigh contrast laser pulses interacting with ultrathin targets. Phys. Plasmas 14(3), 030701 (2007) 6. A. Levy, T. Ceccotti, P. D’Oliveira, F. Reau, M. Perdrix, F. Qurere, P. Monot, M.
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P. Mora, Thin-foil expansion into a vacuum. Phys. Rev. E 72(5), 056401 (2005) 19. P. Mora, Plasma expansion into a vacuum. Phys. Rev. Lett. 90(18), 185002 (2003) Chapter 4 Ion Acceleration Due to their high mass, ions cannot be accelerated directly by the field of currently achievable laser pulses. Substituting the electron mass by the 1,836 times higher proton mass (mp) in the vector potential a0, the averaged kinetic energy which can be gained is defined by the ponderomotive potential Upond;prot as follows [1, 2]: 0sffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 1 2 a0 Upond;prot ¼ mp c2 ðc À 1Þ ¼ mp c2 @ 1 þ À 1A: ð4:1Þ 1; 8362 For a0 = 3 (I % 1:5 Â 1019 W/cm2 ) the ponderomotive potential becomes Upond;prot % 1:3 keV which can be neglected within the scope of ion acceleration.