UKAEA Papers

"Off-axis fishbone-like instability and excitation of resistive wall modes in JT-60U and DIII-D"

• M. Okabayashi
• G. Matsunaga
• J.S. Degrassie
• W.W. Heidbrink
• Y. In
• Y.Q. Liu
• H. Reimerdes
• W.M. Solomon
• E.J. Strait
• M. Takechi
• N. Asakura
• R.V. Budny
• G.L. Jackson
• J.M. Hanson
• R. J. La Haye
• M.J. Lanctot
• J. Manickam
• K. Shinohara
• Y.B. Zhu

An energetic-particle (EP)-driven “off-axis-fishbone-like mode (OFM)” often triggers a resistive wall mode (RWM) in JT-60U and DIII-D devices, preventing long-duration high-b N discharges. In these experiments, the EPs are energetic ions (70–85 keV) injected by neutral beams to produce high-pressure plasmas. EP-driven bursting events reduce t…