Ion absorption effects in high-harmonic fast wave ray tracing theory

1999 ◽  
Author(s):  
J. E. Menard ◽  
C. K. Phillips ◽  
T. K. Mau
Keyword(s):  
Ray Tracing ◽  
High Harmonic ◽  
Fast Wave ◽  
Ion Absorption ◽  
Wave Ray

Fast ion absorption of the high harmonic fast wave in the National Spherical Torus Experiment

2004 ◽  
Vol 11 (5) ◽  
pp. 2441-2452 ◽  
Author(s):  
A. L. Rosenberg ◽  
J. E. Menard ◽  
J. R. Wilson ◽  
S. S. Medley ◽  
R. Andre ◽  
...  
Keyword(s):  
High Harmonic ◽  
Fast Wave ◽  
Spherical Torus ◽  
Ion Absorption ◽  
Fast Ion

scholarly journals Characterization of Fast Ion Absorption of the High Harmonic Fast Wave in the National Spherical Torus Experiment

2003 ◽  
Author(s):  
A.L. Rosenberg ◽  
J.E. Menard ◽  
J.R. Wilson ◽  
S. Medle ◽  
C.K. Phillips ◽  
...  
Keyword(s):  
High Harmonic ◽  
Fast Wave ◽  
Spherical Torus ◽  
Ion Absorption ◽  
Fast Ion

scholarly journals Investigation of Ion Absorption of the High Harmonic Fast Wave in NSTX using HPRT

2001 ◽  
Author(s):  
A. Rosenberg ◽  
J.E. Menard ◽  
B.P. and LeBlanc
Keyword(s):  
High Harmonic ◽  
Fast Wave ◽  
Ion Absorption

A full wave theory of high-harmonic fast wave absorption in high-beta plasmas

1998 ◽  
Vol 5 (6) ◽  
pp. 2284-2290 ◽  
Author(s):  
C. N. Lashmore-Davies ◽  
V. Fuchs ◽  
R. A. Cairns
Keyword(s):  
High Harmonic ◽  
Wave Theory ◽  
Fast Wave ◽  
Wave Absorption ◽  
Full Wave ◽  
High Beta

Resonant wave-filament interactions as a loss mechanism for HHFW heating and current drive

2021 ◽  
Author(s):  
Wouter Tierens ◽  
James R Myra ◽  
Roberto Bilato ◽  
Laurent Colas
Keyword(s):  
Surface Wave ◽  
Surface Waves ◽  
High Harmonic ◽  
Current Drive ◽  
Fast Wave ◽  
Power Losses ◽  
Loss Mechanism ◽  
Resonant Wave ◽  
Plasma Filaments ◽  
Analytic Expression

Abstract Perkins et al. PRL 2012 [1] reported unexpected power losses during High Harmonic Fast Wave (HHFW) heating and current drive in NSTX. Recently, Tierens et al [2] proposed that these losses may be attributable to surface waves on field-aligned plasma filaments, which carry power along the filaments, to be lost at the endpoints where the filaments intersect the limiters. In this work, we show that there is indeed a resonant loss mechanism associated with the excitation of these surface waves, and derive an analytic expression for the power lost to surface wave modes at each filament.

scholarly journals Rossby Wave Ray Tracing in a Barotropic Divergent Atmosphere

2008 ◽  
Vol 65 (5) ◽  
pp. 1679-1691 ◽  
Author(s):  
Chungu Lu ◽  
John P. Boyd
Keyword(s):  
Wave Propagation ◽  
Ray Tracing ◽  
Rossby Wave ◽  
Level Structure ◽  
Low Frequency ◽  
Present Theory ◽  
Wave Ray ◽  
Divergent Wind ◽  
Rossby Wave Propagation ◽  
Upper Level

Abstract The effects of divergence on low-frequency Rossby wave propagation are examined by using the two-dimensional Wentzel–Kramers–Brillouin (WKB) method and ray tracing in the framework of a linear barotropic dynamic system. The WKB analysis shows that the divergent wind decreases Rossby wave frequency (for wave propagation northward in the Northern Hemisphere). Ray tracing shows that the divergent wind increases the zonal group velocity and thus accelerates the zonal propagation of Rossby waves. It also appears that divergence tends to feed energy into relatively high wavenumber waves, so that these waves can propagate farther downstream. The present theory also provides an estimate of a phase angle between the vorticity and divergence centers. In a fully developed Rossby wave, vorticity and divergence display a π/2 phase difference, which is consistent with the observed upper-level structure of a mature extratropical cyclone. It is shown that these theoretical results compare well with observations.

Sign in / Sign up

Export Citation Format

Share Document