Theoretical Interpretation of Alfv en Cascades in Tokamaks with Non-monotonic q-pro les

نویسندگان

  • H. L. Berk
  • D. N. Borba
  • B. N. Breizman
  • S. D. Pinches
چکیده

Alfv en spectra in a reversed-shear tokamak plasma with a population of energetic ions exhibit a quasiperiodic pattern of primarily upward frequency sweeping (Alfv en Cascade). Presented here is an explanation for such asymmetric sweeping behavior which involves nding a new energetic particle mode localized around the point of zero magnetic shear.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Analysis of the nonlinear behavior of shear-Alfv! en modes in tokamaks based on Hamiltonian mapping techniques

en modes in tokamaks based on Hamiltonian mapping techniques S. Briguglio, X. Wang, F. Zonca, G. Vlad, G. Fogaccia, C. Di Troia, and V. Fusco ENEA C. R. Frascati, Via E. Fermi 45, C.P. 65-00044 Frascati, Rome, Italy Max-Planck-Institut f€ ur Plasmaphysik, Boltzmannstraße 2, D-85748 Garching, Germany Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangz...

متن کامل

Preprint: Alfv¶en Wave Instability of Current Sheets in Force-Free Collisionless Plasmas

If the current sheet between adjacent twisted magnetic °ux tubes is suf̄ciently thin, the electron °ow velocity becomes comparable to the Alfv¶en velocity and can destabilize collisionless Alfv¶en waves. The threshold for instability in force-free plasmas is calculated for both inertial and kinetic Alfv¶en wave regimes. When there is strong magnetic shear, unstable kinetic Alfv¶en waves can reso...

متن کامل

Temporal Evolution of Drift Alfv en Waves in an Inhomogeneous Plasma with Homogeneous Shear Flow

The temporal evolution of drift-Alfv en waves in a plasma ow with homogeneous shear is studied as an initial value problem without the use of spectral expansion in time. It is shown that the conventional modal structure of the drift-Alfv en instability (as well as drift and Alfv en waves) pertains only in the initial stage of its evolution. For larger times, non-modal e ects due to the velocity...

متن کامل

Linear theory and measurements of electron oscillations in an inertial Alfv en wave

The physics of the aurora is one of the foremost unsolved problems of space physics. The mechanisms responsible for accelerating electrons that precipitate onto the ionosphere are not fully understood. For more than three decades, particle interactions with inertial Alfv en waves have been proposed as a possible means for accelerating electrons and generating auroras. Inertial Alfv en waves hav...

متن کامل

Non-linear Alfv en wave interaction leading to resonant excitation of an acoustic mode in the laboratory

The nonlinear three-wave interaction process at the heart of the parametric decay process is studied by launching counter-propagating Alfv en waves from antennas placed at either end of the Large Plasma Device [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)]. A resonance in the beat wave response produced by the two launched Alfv en waves is observed and is identified as a damped ion ac...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2001