Full wave simulations of fast wave mode conversion and lower hybrid wave propagation in tokamaks

Wright, J. C.; Bonoli, P. T.; Brambilla, M.; Méo, F.; D’Azevedo, E.; Batchelor, D. B.; Jaeger, E. F.; Berry, L. A.; Phillips, C. K.; Pletzer, A.

doi:10.1063/1.1652731

Cited by 83 publications

(84 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We stress that modelling mode conversion to short wave modes in two dimensions is a very challenging problem, the adequate treatment of which has recently started by appealing to massively parallel computers [37]. The CYRANO results presented here are accordingly preliminary for the MC regime, because our present computer capability only allows a partial numerical resolution of the short mode converted waves in the poloidal direction for a large tokamak such as JET.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Hydrogen plasmas with ICRF inverted minority and mode conversion heating regimes in the JET tokamak

Mayoral

Lamalle²,

Eester³

et al. 2006

Nucl. Fusion

131

View full text Add to dashboard Cite

Abstract:During the initial operation of the International Thermonuclear Experimental Reactor (ITER), it is envisaged that activation will be minimised by using hydrogen (H) plasmas where the reference ion cyclotron resonance frequency (ICRF) heating scenarios rely on minority species such as helium ( 3 He) or deuterium (D). This paper firstly describes experiments dedicated to the study of 3 He heating in H plasmas with a sequence of discharges in which 5 MW of ICRF power was reliably coupled and the 3 He concentration, controlled in real-time, was varied from below 1 % up to 10 %. The minority heating regime was observed at low concentrations (up to 2 %). Energetic tails in the 3 He ion distributions were observed with effective temperatures up to 300 keV and bulk electron temperatures up to 6 keV. At around 2 %, a sudden transition was reproducibly observed to the mode conversion regime, in which the ICRF fast wave couples to short wavelength modes, leading to efficient direct electron heating and bulk electron temperatures up to 8 keV. Secondly, experiments performed to study D minority ion heating in H plasmas are presented. This minority heating scheme proved much more difficult since modest quantities of carbon (C) impurity ions, which have the same charge to mass ratio as the D ions, led directly to the mode conversion regime.Finally, numerical simulations to interpret these two sets of experiments are under way and preliminary results are shown.

show abstract

Section: Numerical Simulationsmentioning

confidence: 99%

Hydrogen plasmas with ICRF inverted minority and mode conversion heating regimes in the JET tokamak

Mayoral

Lamalle²,

Eester³

et al. 2006

Nucl. Fusion

131

View full text Add to dashboard Cite

show abstract

“…The codes include AORSA [13,14], CYRANO [15,16], EVE [17], PSTELION [18], TASK/WM [19], and TORIC (version 6) [20,21], (version 5 is used for the PTRANSP-generated inputs for the simulations). A summary of approximations and numerical methods is given in Table II Parameters needed for quantitative comparisons of the benchmarking results include the locations of resonance layers, zero-dimensional results such as the heating partitions, one-dimensional results such as heating profiles and electromagnetic fields along chords.…”

Section: Full-wave Solversmentioning

confidence: 99%

Benchmarking ICRF Full-wave Solvers for ITER

2011

View full text Add to dashboard Cite

Benchmarking of full-wave solvers for ICRF simulations is performed using plasma profiles and equilibria obtained from integrated self-consistent modeling predictions of four ITER plasmas. One is for a high performance baseline (5.3 T, 15 MA) DT H-mode. The others are for half-field, half-current plasmas of interest for the pre-activation phase with bulk plasma ion species being either hydrogen or He 4 . The predicted profiles are used by six full-wave solver groups to simulate the ICRF electromagnetic fields and heating, and by three of these groups to simulate the current-drive.Approximate agreement is achieved for the predicted heating power for the DT and He 4 cases. Factor of two disagreements are found for the cases with second harmonic He 3 heating in bulk H cases. Approximate agreement is achieved simulating the ICRF current drive.

show abstract

“…The action-angle formalism is discussed in [33][34][35][36][37]. Comments on how to solve the relevant set of equations -with a focus on accounting for the realistic geometry -are given in [38][39][40][41][42][43][44][45][46][47][48][49][50][51] while the role of decorrelation is the key subject in [52][53][54][55].…”

Section: A Comment On the List Of Referencesmentioning

confidence: 99%

“…SOME ASPECTS OF NONUNIFORM PLASMA MODELING III.A. Mode Coupling [38][39][40][41][42][43][44][45][46][47][48][49][50][51] Before commenting on the particular issues brought about by the impact of the plasma inhomogeneities on the orbits of the particles and the challenges this leads to when trying to write down a rigorous expression for the dielectric response, a simplified problem is looked at first, namely that of the wave propagation in a tokamak in absence of a poloidal field i.e. where the guiding center orbits are assumed to simply being given by ϕ(t) = ϕ(t o ) + v // (t − t o ).…”

Section: Iig a Note On Selfconsistencymentioning

confidence: 99%

Kinetic theory of plasma waves

2003

Series in Plasma Physics

View full text Add to dashboard Cite

In the present paper a very brief introduction is provided to the theory of kinetic waves relevant to the description of wave heating in fusion machines and focussing mostly on radio frequency or ion cyclotron resonance frequency waves in tokamaks. The text starts by sketching the basic philosophy underlying the standardly adopted methods, describing the interaction of a single particle with a given wave and the assumptions typically made to arrive at a trustworthy description of the energy exchange, and ends by discussing some of the subtleties of the modeling of wave-particle interaction in inhomogeneous magnetized plasmas. None of the topics will be treated in full detail. Hence, by no means, this text is meant to be all-inclusive. Rather, it aims at providing a framework that should allow understanding what are the difficulties involved, leaving out the detailed derivation of the expressions as well as subtleties such as relativistic corrections. The interested reader is referred to the provided references -and the references given therein -for more in depth information.

show abstract

Full wave simulations of fast wave mode conversion and lower hybrid wave propagation in tokamaks

Cited by 83 publications

References 18 publications

Hydrogen plasmas with ICRF inverted minority and mode conversion heating regimes in the JET tokamak

Hydrogen plasmas with ICRF inverted minority and mode conversion heating regimes in the JET tokamak

Benchmarking ICRF Full-wave Solvers for ITER

Kinetic theory of plasma waves

Contact Info

Product

Resources

About