Tearing and MHD Instability During Gun Injection into a Spheromak

Fowler, T K

Lawrence Livermore National Laboratory

关键词: 70 Plasma Physics And Fusion Technology;    Instability;    Helicity;    Electron Guns;    Spheromak Devices;   

DOI  :  10.2172/15013537
RP-ID  :  UCRL-ID-139019
RP-ID  :  W-7405-ENG-48
RP-ID  :  15013537

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来源: UNT Digital Library

【 摘 要 】

Linear stability analysis of a two-cylinder approximation to gun injection--one cylinder to represent the confined spheromak and another to represent the gun--is shown to yield equilibria in which tearing modes exist simultaneously at the magnetic axis and at the geometric (gun) axis, as might be required to sustain helicity injection. These equilibria are MHD stable at the two axes but may have localized MHD instability at an interior minimum in the q profile. The theory predicts two tearing thresholds with successively deeper q minima as the gun current is increased at constant bias flux.