The status of alpha-particle diagnostics

Young, K. M.; Johnson, D.

doi:10.1088/0741-3335/34/13/032

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Further information about other proposed alpha diagnostics can be found in various diagnostic reviews and conference proceedings [40][41][42][43].…”

Section: Alpha Particle Diagnostics For Tftrmentioning

confidence: 99%

“…Further information about other proposed alpha diagnostics can be found in various diagnostic reviews and conference proceedings [40][41][42][43]. References [42] and [43] contain papers and summaries from the two most recent IAEA Technical Committee Meetings on Alpha Particles in Fusion Research, which has been the main forum for international discussions of alpha particle physics since 1986.…”

Section: Ion Cyclotronmentioning

confidence: 99%

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Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

106

104

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Alpha particle physics experiments were done on the Tokamak Fusion Test Reactor (TFTR) during its deuterium-tritium (DT) run from 1993-1997. These experiments utilized several new alpha particle diagnostics and hundreds of DT discharges to characterize the alpha particle confinement and wave-particle interactions. In general, the results from the alpha particle diagnostics agreed with the classical singleparticle confinement model in magnetohydrodynamic (MHD) quiescent discharges. Also, the observed alpha particle interactions with sawteeth, toroidal Alfvén eigenmodes (TAE), and ion cyclotron resonant frequency (ICRF) waves were roughly consistent with theoretical modeling. This paper reviews what was learned and identifies what remains to be understood.2

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“…Further information about other proposed alpha diagnostics can be found in various diagnostic reviews and conference proceedings [40][41][42][43].…”

Section: Alpha Particle Diagnostics For Tftrmentioning

confidence: 99%

Section: Ion Cyclotronmentioning

confidence: 99%

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

106

104

View full text Add to dashboard Cite

show abstract

Observation of alpha particle slowing-down spectra in JET helium beam fuelling and heating experiments

Hellermann

Core

Frieling

et al. 1993

Plasma Phys. Control. Fusion

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AbstradThe first experimental results are reported of anisotropic slowing-down features observed in JET helium beam fuelling experiments. Two independent observation ports, one with a view perpendicular to the magnetic field in the Centre of the plasma and a second multichord viewing arrangement, approximately tangential to the toroidal field, provide'radially and temporally resolved information on the velocity distribution function comprising the populations of both fast and thermalized alpha particles. The fuelling process is charactaized by a change-over from a distinctly non-Maxwellian distribution function to a dominantly Maxwellian distribution and also by a broadening of the deduced fast ion density radial profile. The fast particle component in the observed composite charge exchange spectrum is found to be in excellent agreement with predictions which are based on anisotropic velocity distribution functions obtained from the analvtical solution of the neutral iniection Fokker-Planck equation.Absolute Darticle densities of both slowine-down and thermalized alDha oarticles are -. .determined and compared with densities and particle numbers expected from beam current and fuelling time. Thus quantitative data consistency is established for alpha particles from thermal energies up to the 'He" injection energy of 150 keV. Sawtooth oscillations in both thermal and non-thermal alpha particle densities are found in low-power, low-temperature plasma with no additional RF heating and with sawteeth periods comparable to the slowing-down time.Signal-to-noise levels in the measurement of fast alpha particles in the JET helium fuelling campaign are extrapolated to thermonuclear fusion alpha particle density levels expected for the D-T phase of JET. It is shown that beam penetration and not competing continuum radiation is a major constraint, and that acceptable (hydrogen or helium) neutral beam power and energy requirements promise a feasible CX alpha particle diagnosis in the core of next-step devices such as ITER.

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Results from deuterium-tritium tokamak confinement experiments

Hawryluk

1998

Rev. Mod. Phys.

123

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Recent scientific and technical progress in magnetic fusion experiments has resulted in the achievement of plasma parameters (density and temperature) which enabled the production of significant bursts of fusion power from deuterium-tritium fuels and the first studies of the physics of burning plasmas. The key scientific issues in the reacting plasma core are plasma confinement, magnetohydrodynamic (MHD) stability, and the confinement and loss of energetic fusion products from the reacting fuel ions. Progress in the development of regimes of operation which have both good confinement and are MHD stable have enabled a broad study of burning plasma physics issues.

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The status of alpha-particle diagnostics

Cited by 4 publications

References 19 publications

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Observation of alpha particle slowing-down spectra in JET helium beam fuelling and heating experiments

Results from deuterium-tritium tokamak confinement experiments

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