Measurement of the Internal Magnetic Field of Plasmas using an Alpha Particle Source

Zweben, S.J. ; Darrow, D.S. ; Ross, P.W. ; Lowrance, J.L. ; Renda, G.

Princeton University. Plasma Physics Laboratory.

关键词: Alpha Particles;    Magnetic Fields;    70 Plasma Physics And Fusion Technology;    Diagnostics;    Alpha Sources;   

DOI  :  10.2172/827999
RP-ID  :  PPPL-3958
RP-ID  :  AC02-76CH03073
RP-ID  :  827999

美国|英语

来源: UNT Digital Library

【 摘 要 】

The internal magnetic fields of plasmas can be measured under certain conditions from the integrated v x B deflection of MeV alpha particles emitted by a small radioactive source. This alpha source and large-area alpha particle detector would be located inside the vacuum vessel but outside the plasma. Alphas with a typical energy of 5.5 MeV (241Am) can reach the center of almost all laboratory plasmas and magnetic fusion devices, so this method can potentially determine the q(r) profile of tokamaks or STs. Orbit calculations, background evaluations, and conceptual designs for such a vxB (or ''AVB'') detector are described.