Harmonic launching of ion Bernstein waves via mode transformation

Experimental observation of ion heating by mode- converted ion Bernstein waves in tokamak plasmas

We report the experimental observation of ion heating by the mode-converted ion Bernstein waves (MC IBWs) in tokamak plasmas. The MC IBW is created from the fast waves launched from the high-field-side antenna in the HT-7 tokamak in plasmas consisting of deuterium majority, hydrogen minority and 7Li ions. Experimental evidence and numerical simulation show that the interaction between the MC IB...

Controlled optimization of mode conversion from electron Bernstein waves to extraordinary mode in magnetized plasma.

In the CDX-U spherical torus, agreement between radiation temperature and Thomson scattering electron temperature profiles indicates approximately 100% conversion of thermally emitted electron Bernstein waves to the X mode. This has been achieved by controlling the electron density scale length (L(n)) in the conversion region with a local limiter outside the last closed flux surface, shortening...

Emission of Electron Bernstein Waves

Jacobi–bernstein Basis Transformation

Abstract — In this paper we derive the matrix of transformation of the Jacobi polynomial basis form into the Bernstein polynomial basis of the same degree n and vice versa. This enables us to combine the superior least-squares performance of the Jacobi polynomials with the geometrical insight of the Bernstein form. Application to the inversion of the Bézier curves is given. 2000 Mathematics Sub...

Psfc/ja-97-8 Mode Conversion to Ion-bernstein Waves of Fast Alfven Waves with Poloidal Wavenumbers in Sheared Magnetic Fields

Previous theoretical analysis [1] of mode conversion of fast Alfv6n waves (FAW) to ion-Bernstein waves (IBW) neglected poloidal variations of the fields and magnetic shear. Full-wave codes show incident FAW fields focused into multiple poloidal modes near the ion-ion hybrid resonance (IHR)[2]. A new mode conversion model has been constructed including poloidal wavenumbers and poloidal magnetic ...