Observations of fast protons above 1 MeV produced in direct-drive laser-fusion experiments

Journal Article · Thu Feb 01 00:00:00 EST 2001 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1335831· OSTI ID:40205984

Hicks, D G; Li, C K; Seguin, F H; Schnittman, J D; Ram, A K; Frenje, J A; Petrasso, R D; Soures, J M; Meyerhofer, D D; Roberts, S ^[1]

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1. and others

Fast protons {approx}>1 MeV have been observed on the 60-beam, 30 kJ OMEGA laser [T. R. Boehly , Opt. Commun. 133, 495 (1997)] at an intensity I{approx_equal}10{sup 15} W/cm{sup 2} and a wavelength {lambda}=0.35 {mu}m. These energies are more than 5 times greater than those observed on previous, single-beam experiments at the same I{lambda}{sup 2}. The total energy in the proton spectrum above 0.2 MeV is {approx}0.1% of the laser energy. Some of the proton spectra display intense, regular lines which may be related to ion acoustic perturbations in the expanding plasma.

• Sponsoring Organization: (US)
• OSTI ID: 40205984
• Journal Information: Physics of Plasmas, Vol. 8, Issue 2; Other Information: DOI: 10.1063/1.1335831; Othernumber: PHPAEN000008000002000606000001; 014102PHP; PBD: Feb 2001; ISSN 1070-664X
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACOUSTICS
LASERS
PHYSICS
PLASMA
PROTON SPECTRA
PROTONS
WAVELENGTHS