General Principles of Magnetic Confinement

Hogan, J.

doi:10.1007/978-1-4613-3763-8_2

Cited by 2 publications

(3 citation statements)

References 30 publications

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“…In all of the issues addressed above, theoretical models of the plasma environment have incorporated, where available, charge transfer cross section and rate coefficients for H while the plasma contains D and T. The current calculations for partially ionized N 4+ indicate a small but potentially significant reduction of the D and T 1 + -manifold cross sections compared to H below a few eV. This corresponds to conditions at the very edge of the divertor region and implies that the impurity radiative power density which rises rapidly at low temperatures (Hogan 1983) may be somewhat reduced. Further, as suggested by Stancil and Zygelman (1995), this isotope effect will increase in importance as the atomic mass and degree of ionization of the impurity species increases.…”

Section: Fusion Plasmasmentioning

confidence: 90%

“…In addition, fully ionized, and therefore nonradiating, species become hydrogenlike and contribute to the impurity radiation loss. Inclusion of charge transfer may result in an increase of the impurity radiative power density by a factor of ∼30 in some models (Hogan 1983). This power loss, enhanced by charge exchange, requires higher fusion temperatures in the central region to compensate for the reduction in efficiency (Drawin 1983).…”

Section: Fusion Plasmasmentioning

confidence: 99%

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State- and isotope-dependent charge transfer of with atomic hydrogen in astrophysical and fusion plasmas

Stancil

Zygelman

Clarke

1997

J. Phys. B: At. Mol. Opt. Phys.

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State-and target-isotope-dependent cross sections for electron capture in collisions of N 4+ (2s) with H(1s), D(1s), and T(1s) are presented for the energy range 0.01-6000 eV amu −1 . Results are given for capture via radial coupling into the N 3+ 2s3s 1 S, 2s3p 1 P o , 2s3d 1 D, 2s3s 3 S, 2s3p 3 P o , 2s3d 3 D, and 2p3s 3 P o states and are obtained through a close-coupled, quantummechanical, molecular-orbital method. Fully ab initio molecular data determined with the spincoupled valence-bond method are incorporated. Rate coefficients for temperatures between 1000 and 10 6 K are also presented. Applications to astrophysical environments and laboratory plasmas are addressed. The importance of state-dependent parameters for the modelling of nebulae emission lines and for fusion plasma impurity diagnostics and the potential significance of isotope effects to models of the edge region of a tokamak device are briefly discussed.

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Section: Fusion Plasmasmentioning

confidence: 90%

Section: Fusion Plasmasmentioning

confidence: 99%

State- and isotope-dependent charge transfer of with atomic hydrogen in astrophysical and fusion plasmas

Stancil

Zygelman

Clarke

1997

J. Phys. B: At. Mol. Opt. Phys.

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“…Although various types of magnetic confinement devices exist and some are addressed in the paper, the bulk of the work reported involves tokamaks. The major goal of TFTR is to achieve "breakeven" (fusion power out = beating The tokamak has been reviewed in several papers n, [48][49][50][51][52][53][54][55].…”

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confidence: 99%

Low-energy x-ray emission from magnetic-fusion plasmas

Hill¹,

Bitter²,

Eames³

et al. 1982

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Complex, transient, spatially itihomogeneous tokamak plasmas require careful diagnosis. As the reactor regime is approached, soft X : ays become more important as a versatile diagnostic tool and an energy-loss-echanism. Continuum emission provides a measure of electron temperature ;. id light impurity content. Impurity lines serve as a probe for ion and electron temperature, impurity behavior, and radiative cooling. The entire spectrum yields vital information on instabilities and disruptions. The importance of impurities is illustrated by the extensive efforts toward understanding impurity production, effects, and control. Minute heavy impurity concen trations can prevent reactor ignition. Si(Li)-detector arrays give a broad overview of continuum and line x-ray emission (-,3-50 keV) with moderate energy (200 eV) and time (50 ms) resolution. Bragg crystal and grating spectrometers provide detailed information on impurity lines with moderate to excellent (E/AE = 100-23,000) resolving power and 1-50 ms time resolution. Imaging detector arrays measure rapid (~ 10 ys) fluctuations due to MHD instabilities and probe impurity behavior and radiative cooling. Future tokamaks require more diagnostic channels to avoid spatial scanning, higher throughput for fast, single-shot diagnosis, increased spectral PPPL-1807 DES2 009817 information per sample period via fast scanning or use of multi-element detectors with dispersive elements, and radiation shielding and hardening of detectors. This report

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General Principles of Magnetic Confinement

Cited by 2 publications

References 30 publications

State- and isotope-dependent charge transfer of with atomic hydrogen in astrophysical and fusion plasmas

State- and isotope-dependent charge transfer of with atomic hydrogen in astrophysical and fusion plasmas

Low-energy x-ray emission from magnetic-fusion plasmas

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