Transparency of Magnetized Plasma at Cyclotron Frequency

Shvets, G. ; Wurtele, J.S.

Princeton University. Plasma Physics Laboratory.

关键词: Electromagnetic Pulses;    70 Plasma Physics And Fusion Technology;    43 Particle Accelerators;    Lagrangian Function;    Cyclotron Frequency;   

DOI  :  10.2172/796221
RP-ID  :  PPPL-3680.pdf
RP-ID  :  AC02-76CH03073
RP-ID  :  796221

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来源: UNT Digital Library

【 摘 要 】

Electromagnetic radiation is strongly absorbed by a magnetized plasma if the radiation frequency equals the cyclotron frequency of plasma electrons. It is demonstrated that absorption can be completely canceled in the presence of a magnetostatic field of an undulator or a second radiation beam, resulting in plasma transparency at the cyclotron frequency. This effect is reminiscent of the electromagnetically induced transparency (EIT) of the three-level atomic systems, except that it occurs in a completely classical plasma. Unlike the atomic systems, where all the excited levels required for EIT exist in each atom, this classical EIT requires the excitation of the nonlocal plasma oscillation. The complexity of the plasma system results in an index of refraction at the cyclotron frequency that differs from unity. Lagrangian description was used to elucidate the physics and enable numerical simulation of the plasma transparency and control of group and phase velocity. This control naturally leads to applications for electromagnetic pulse compression in the plasma and electron/ion acceleration.