Magnetic field measurements in laser-produced plasmas via proton deflectometry

Large magnetic fields generated during laser-matter interaction at irradiances of ∼ 5 × 10 14   W   cm − 2 have been measured using a deflectometry technique employing MeV laser-accelerated protons. Azimuthal magnetic fields were identified unambiguously via a characteristic proton deflection patter...

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Bibliographic Details
Published in:Physics of plasmas 2009-04, Vol.16 (4)
Main Authors: Cecchetti, C. A., Borghesi, M., Fuchs, J., Schurtz, G., Kar, S., Macchi, A., Romagnani, L., Wilson, P. A., Antici, P., Jung, R., Osterholtz, J., Pipahl, C. A., Willi, O., Schiavi, A., Notley, M., Neely, D.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LASER-PRODUCED PLASMA
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
PLASMA DIAGNOSTICS
PLASMA SIMULATION
PROTONS
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Summary:Large magnetic fields generated during laser-matter interaction at irradiances of ∼ 5 × 10 14   W   cm − 2 have been measured using a deflectometry technique employing MeV laser-accelerated protons. Azimuthal magnetic fields were identified unambiguously via a characteristic proton deflection pattern and found to have an amplitude of ∼ 45   T in the outer coronal region. Comparison with magnetohydrodynamic simulations confirms that in this regime the ∇ ⃗ T e × ∇ ⃗ n e source is the main field generation mechanism, while additional terms are negligible.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.3097899