Refine your search:     
Report No.

Observation of energetic particle driven axisymmetric mode in the JT-60U tokamak

Matsunaga, Go; Kamiya, Kensaku; Shinohara, Koji; Miyato, Naoaki; Kojima, Atsushi; Bierwage, A.; JT-60 Team

In the JT-60U experimental operations with high normalized beta $$beta_mathrm{N}$$ or high bootstrap fraction $$f_mathrm{BS}$$, magnetic fluctuations with multiple peaks in the geodesic acoustic mode (GAM) frequency range are observed. These peaks appear just after tangential NB injection with 90 keV beam energy in L-mode phase to form weak/strong reversed magnetic shear plasmas. Observed magnetic fluctuations have $$n$$ = 0 axisymmetric toroidal mode structures and $$m$$ = 2 poloidal ones, where $$n$$ and $$m$$ are the toroidal and poloidal mode number, respectively. Interestingly, the poloidal mode structure sometimes behaves like standing wave. Usually, the standing wave nodes are located around the inboard and outboard midplanes, and the top and bottom of plasmas. Namely, these modes have $$m$$ = 2 components in both ion and electron diamagnetic directions. We will report the detail of the observed $$n$$ = 0 axisymmetric modes in the JT-60U tokamak.



- Accesses





[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.