Neutral Particle Induced Potentials in Tokamak Plasmas

P. Bachmann; D. Sunder; D. D. Tskhakaya

doi:10.1002/ctpp.2150300103

The Influence of Neutral Particle Sources on the Dynamics of Tokamak Plasmas. II. Particle Dynamics and Induced Electromagnetic Fields

Contributions to Plasma Physics ◽

10.1002/ctpp.2150290110 ◽

1989 ◽

Vol 29 (1) ◽

pp. 71-76 ◽

Cited By ~ 1

Author(s):

P. Bachmann ◽

D. Sünder ◽

D. D. Tskhakaya

Keyword(s):

Electromagnetic Fields ◽

Neutral Particle ◽

Particle Dynamics ◽

Tokamak Plasmas

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A 10-Channel Neutral Particle Energy Analyser for Measurements of Ion Temperatures on Tokamak Plasmas

Japanese Journal of Applied Physics ◽

10.1143/jjap.16.139 ◽

1977 ◽

Vol 16 (1) ◽

pp. 139-147 ◽

Cited By ~ 7

Author(s):

Hiroshi Takeuchi ◽

Akimasa Funahashi ◽

Koki Takahashi ◽

Hirofumi Shirakata ◽

Syukuro Yano

Keyword(s):

Neutral Particle ◽

Particle Energy ◽

Tokamak Plasmas

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A Code that Simulates Fast-Ion Dα and Neutral Particle Measurements

Communications in Computational Physics ◽

10.4208/cicp.190810.080211a ◽

2011 ◽

Vol 10 (3) ◽

pp. 716-741 ◽

Cited By ~ 82

Author(s):

W. W. Heidbrink ◽

D. Liu ◽

Y. Luo ◽

E. Ruskov ◽

B. Geiger

Keyword(s):

Neutral Particle ◽

Radiative Transition ◽

Efficient Solutions ◽

Tokamak Plasmas ◽

Exchange Reactions ◽

Ion Distribution ◽

Neutral Beams ◽

Atomic States ◽

Fast Ion ◽

Neutral Particle Analyzer

AbstractA code that models signals produced by charge-exchange reactions between fast ions and injected neutral beams in tokamak plasmas is described. With the fast-ion distribution function as input, the code predicts the efflux to a neutral particle analyzer (NPA) diagnostic and the photon radiance of Balmer-alpha light to a fast-ion Dα (FIDA) diagnostic. Reactions with both the primary injected neutrals and with the cloud of secondary “halo” neutrals that surround the beam are treated. Accurate calculation of the fraction of neutrals that occupy excited atomic states (the collisional-radiative transition equations) is an important element of the code. Comparison with TRANSP output and other tests verify the solutions. Judicious selection of grid size and other parameters facilitate efficient solutions. The output of the code has been validated by FIDA measurements on DIII-D but further tests are warranted.

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Creation of Electric Fields in Tokamak Plasmas

Zeitschrift für Naturforschung A ◽

10.1515/zna-1987-1018 ◽

1987 ◽

Vol 42 (10) ◽

pp. 1193-1198

Author(s):

D. F. Düchs

Keyword(s):

Electric Fields ◽

Charge Separation ◽

Neutral Particle ◽

Fusion Plasmas ◽

Tokamak Plasmas ◽

Rf Heating ◽

Absorption Process ◽

Particle Injection ◽

Beam Injection ◽

Pellet Injection

In conjunction with energy and particle fuelling, considerable mechanical or electromagnetic momenta are transferred to fusion plasmas, e.g. through neutral beam injection, limiter recycling, pellet injection and RF heating.The build up of electric fields through charge separation in the momentum absorption process is estimated for somewhat simplified cases of neutral particle injection and recycling.It is shown that for the parameters of large present-day tokamak devices remarkable electric field strengths of the order of 5 • 105 Volt/m can be created both in the plasma regions of beam absortion and near limiters.

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