Article

Proton radiography of a laser-driven implosion

DOI:Phys Rev Lett 97 4 045001 (2006)
Source: OAI

ABSTRACT Protons accelerated by a picosecond laser pulse have been used to radiograph a 500 mu m diameter capsule, imploded with 300 J of laser light in 6 symmetrically incident beams of wavelength 1.054 mu m and pulse length 1 ns. Point projection proton backlighting was used to characterize the density gradients at discrete times through the implosion. Asymmetries were diagnosed both during the early and stagnation stages of the implosion. Comparison with analytic scattering theory and simple Monte Carlo simulations were consistent with a 3 +/- 1 g/cm(3) core with diameter 85 +/- 10 mu m. Scaling simulations show that protons > 50 MeV are required to diagnose asymmetry in ignition scale conditions.

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Keywords

6 symmetrically incident beams
 
analytic scattering theory
 
density gradients
 
diagnose asymmetry
 
diameter 85 +/- 10 mu m. Scaling simulations
 
discrete times
 
ignition scale conditions
 
Point projection proton backlighting
 
Protons
 
pulse length 1 ns
 
stagnation stages