Collisionless absorption in sharp-edged plasmas
The absorption of subpicosecond, obliquely incident laser light is studied using a 11/2D
particle-in-cell code. Density scale lengths from L/λ= 0.01 to 2 and laser irradiances between
I λ 2= 10 14 and 10 18 W cm− 2 μ m 2 are considered.''Vacuum heating''[F. Brunel, Phys.
Rev. Lett. 59, 52 (1987)] dominates over resonance absorption for scale lengths L/λ< 0.1,
and is most efficient when v osc/c≃ 3.1 (L/λ) 2. Absorbed energy is carried mainly by a
''superhot''electron population with U hot∼(I λ 2) 1/3–1/2.
particle-in-cell code. Density scale lengths from L/λ= 0.01 to 2 and laser irradiances between
I λ 2= 10 14 and 10 18 W cm− 2 μ m 2 are considered.''Vacuum heating''[F. Brunel, Phys.
Rev. Lett. 59, 52 (1987)] dominates over resonance absorption for scale lengths L/λ< 0.1,
and is most efficient when v osc/c≃ 3.1 (L/λ) 2. Absorbed energy is carried mainly by a
''superhot''electron population with U hot∼(I λ 2) 1/3–1/2.
Abstract
The absorption of subpicosecond, obliquely incident laser light is studied using a 11/2D particle-in-cell code. Density scale lengths from L/λ= 0.01 to 2 and laser irradiances between I λ 2= 10 14 and 10 18 W cm− 2 μ m 2 are considered.‘‘Vacuum heating’’[F. Brunel, Phys. Rev. Lett. 59, 52 (1987)] dominates over resonance absorption for scale lengths L/λ< 0.1, and is most efficient when v osc/c≃ 3.1 (L/λ) 2. Absorbed energy is carried mainly by a ‘‘superhot’’electron population with U hot∼(I λ 2) 1/3–1/2.
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