Abstract
Parametric dependencies of the linear stability of toroidal Alfvén eigenmode (TAE) in the presence of neutral beam injection (NBI) are investigated to understand the beam drive and damping effect of TAEs in JET and KSTAR. It is found that the results depend on the drift orbit width of the beam-ions normalized to the characteristic mode widths. In addition, an analytic expression of the linear growth rate of TAE driven by ion cyclotron resonance heating (ICRH) fast ions is derived. The developed model is applied to the linear stability analysis of a time-varying JET discharge where both the beam damping and the drive are observed with NBI and ICRH. It can successfully reproduce the experimental observations in spite of simple approximations such as the slowing-down distribution for beam-ions and bi-Maxwellian for ICRH fast ions. We note that strong interaction of TAE with beam occurs in plasmas with rather high density with favorable for the resonance condition, . The developed model can allow fast estimation of the linear stability of TAEs, so it should be useful for optimizing the scenarios and feedback control.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
