Quantitative analysis of proton imaging measurements of laser-induced plasmas |
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Authors: | T Repsilber M Borghesi J-C Gauthier K Löwenbrück A Mackinnon V Malka P Patel G Pretzler L Romagnani T Toncian O Willi |
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Institution: | 1. Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universit?t Düsseldorf, Germany 2. Queens University Belfast, UK 3. LULI, Ecole Polytechnique Palaiseau, France 4. Lawrence Livermore National Laboratory, CA, USA 5. LOA, ENSTA, CNRS, Ecole Polytechnique, Universite d’Orsay, France
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Abstract: | A method for obtaining quantitative information about electric field and charge distributions from proton imaging measurements
of laser-induced plasmas is presented. A parameterised charge distribution is used as target plasma. The deflection of a proton
beam by the electric field of such a plasma is simulated numerically as well as the resulting proton density, which will be
obtained on a screen behind the plasma according to the proton imaging technique. The parameters of the specific charge distributions
are delivered by a combination of linear regression and nonlinear fitting of the calculated proton density distribution to
the measured optical density of a radiochromic film screen changed by proton exposure. It is shown that superpositions of
spherical Gaussian charge distributions as target plasma are sufficient to simulate various structures in proton imaging measurements,
which makes this method very flexible. |
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Keywords: | 52 70 Ds 52 40 Mj 52 40 Nk 41 75 Ak 42 65 -k |
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