Plasma confinement in the m=1, n=1 kink distorted tokamak central core

Putvinskij, S.V.

doi:10.1088/0029-5515/33/1/i11

Cited by 7 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For very fast ions, the mode looks like a stationary n = 1 MHD perturbation of the plasma. This perturbation destroys the toroidal symmetry of the magnetic field and distorts the fast-ion trajectories (see, e.g., [93]). In particular, it broadens the regions of phase space corresponding to the unconfined orbits (prompt loss region), giving rise to enhanced non-resonant losses due to the n = 1 fishbone.…”

Section: The Fishbonesmentioning

confidence: 99%

Major minority: energetic particles in fusion plasmas

Breǐzman

Sharapov

2011

Plasma Phys. Control. Fusion

154

211

View full text Add to dashboard Cite

This paper describes advances made in the field of energetic-particle physics since the topical review of Alfvén eigenmode observations in toroidal plasmas (Wong 1999 Plasma Phys. Control. Fusion 41 R1-R56). The development of plasma confinement scenarios with reversed magnetic shear and significant population of energetic particles, and the development of novel energeticparticle diagnostics were the main milestones in the past decade, and these are the main experimental subjects of this review. The theory of Alfvén cascade eigenmodes in reversed-shear tokamaks and its use in magnetohydrodynamic spectroscopy are presented. Based on experimental observations and nonlinear theory of energetic-particle instabilities in the near-threshold regime, the frequency-sweeping events for spontaneously formed phase-space holes and clumps and the evolution of the fishbone oscillations are described. The multimode scenarios of enhanced particle transport are discussed and a brief summary is given of several engaging research topics that are beyond the authors' direct involvement.

show abstract

Section: The Fishbonesmentioning

confidence: 99%

Major minority: energetic particles in fusion plasmas

Breǐzman

Sharapov

2011

Plasma Phys. Control. Fusion

154

211

View full text Add to dashboard Cite

show abstract

“…Note that the case considered in Ref. [30] corresponds to rather slow evolution of plasma equilibria and low electric field. This means that all groups of particles have a large precession rate in comparison with the time-scale of the evolution.…”

Section: Aandmentioning

confidence: 99%

Modelling of alpha particle slowing down, confinement and redistribution by sawteeth in TFTR using the FPPT code

et al. 1997

View full text Add to dashboard Cite

Results from recent deuterium-tritium (DT) experiments on TFTR t o measure the energy spectra and radial profiles of well trapped confined alpha particle distributions using the pellet charge exchange (PCX) diagnostic in quiescent plasmas are compared with a numerical modelling using the Fokker-Planck post-TRANSP (FPPT) processor code and show a classical slowing down behaviour of the alphas (Fisher, R. K., et al., Phys. Rev. Lett. 75 (1995) 846). However, in the presence of sawtooth oscillations PCX experimental data indicate a significant broadening of the trapped alpha radial distributions (Petrov, M.P., et al., Nucl. Fusion 35 (1995) 1437. Conventional models consistent with measured sawtooth effects on passing particles do not provide satisfactory simulations of the trapped particle mixing measured by the PCX diagnostic. A mechanism is proposed for fast particle mixing during the sawtooth crash to explain the trapped alpha particle radial profile broadening after the crash. The model is based on the fast particle orbit averaged toroidal drift in a perturbed helical electric field with an adjustable absolute value (similar to that in Kolesnichenko, Ya.I., et al., Nucl. Fusion 36 (1996) 159). Such a drift of the fast particles results in a change of their energy and a redistribution in phase space. To show the sensitivity of trapped particles to sawteeth, the redistribution in toroidal momentum Pv (or in minor radius) was calculated in two ways. The first is based on the assumption that Pp redistribution is stochastic with a large diffusion coefficient and was taken to be flat. The second way is to apply Kolesnichenko's inversion formula (Kolesnichenko, Ya.I., et al., Nucl. Fusion 32 (1992) 449). Both methods are compared with PCX data. The distribution function in a presawtooth plasma and its evolution in a post-sawtooth crash plasma are simulated using the FPPT code. It is shown that FPPT calculated alpha particle distributions are consistent with TRANSP Monte Carlo calculations. Comparison of FPPT results with PCX measurements shows good agreement for both sawtooth-free and sawtoothing plasmas.

show abstract

“…Amount of handsome work has already been published contingent with plasma shape, control systems and plasma equilibrium properties by numerical techniques. The work contained includes the following aspects, Plasma shaping . Positive or negative radial electric fields . MHD stability, disruptions and operational limits . Plasma energy and stabilities . Plasma current, shape controller and identification, and plasma scenario of small aspect ratio . …”

Section: Introductionmentioning

confidence: 99%

Development of theoretical model for 3D plasma energy behavior and characteristics

Khan

Song

Liu

et al. 2015

Int. J. Energy Res.

View full text Add to dashboard Cite

Summary In this paper, research has been conducting on calculating full plasma energy and magnetic field cross sections in static as well as in tilting position for analyzing plasma vertical displacement event behavior. Consequently, the main concern of the research is to developed plasma energy and shape model. First, the developed 3D shape model allows an effective way to study the shape of plasma behavior of main plasma characteristics under controlled conditions including sensitive dependent on initial condition based on isolated points. Secondly, the developed 3D plasma energy model denotes every calculated point and analyze magnetic field of each cross section under different values of α and β according to magnetic field produced by a circular current loop. This theoretical approach showed that the individual points ((a, b) & (r, z)) with static and tilting moments are able to develop the three‐dimension coordinates system, based on R0 = 1.7 ∼ 1.8, B0 = 3.5T and plasma current IP ≤ 1MA. Furthermore, 195 × 12 (both states) circle current loop of magnetic field has been calculated as well. The ‘sinβ cross section’ for every 30° in both states (static and tilt with alpha variations) calculates the total plasma energy. Therefore, we have developed computational codes in Matlab program to calculate the values of full plasma energy in EAST. Energy from initial to final state, VDE and external force behavior, poloidal and toroidal fix degree of every cross section that depends on each current loop of magnetic field have been analyzed based on whole plasma energy data. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Plasma confinement in the m=1, n=1 kink distorted tokamak central core

Cited by 7 publications

References 12 publications

Major minority: energetic particles in fusion plasmas

Major minority: energetic particles in fusion plasmas

Modelling of alpha particle slowing down, confinement and redistribution by sawteeth in TFTR using the FPPT code

Development of theoretical model for 3D plasma energy behavior and characteristics

Contact Info

Product

Resources

About