Analysis of particle species evolution in neutral-beam injection lines

Kim, J.; Haselton, H.H.

doi:10.1063/1.326504

Cited by 53 publications

(14 citation statements)

References 3 publications

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“…The procedure to calculate the beam composition from the intensities of the Doppler shifted lines is described in more detail in Refs. [3][4][5][6].…”

Section: Doppler-shifted Spectral Linesmentioning

confidence: 99%

Energy composition of high-energy neutral beams on the COMPASS tokamak

et al. 2016

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Abstract. The COMPASS tokamak is equipped with two identical neutral beam injectors (NBI) for additional plasma heating. They provide a beam of deuterium atoms with a power of up to ~(2 × 300) kW. We show that the neutral beam is not monoenergetic but contains several energy components. An accurate knowledge of the neutral beam power in each individual energy component is essential for a detailed description of the beam--plasma interaction and better understanding of the NBI heating processes in the COMPASS tokamak. This paper describes the determination of individual energy components in the neutral beam from intensities of the Doppler-shifted D lines, which are measured by a high-resolution spectrometer viewing the neutral beam-line at the exit of NBI. Furthermore, the divergence of beamlets escaping single aperture of the last accelerating grid is deduced from the width of the Doppler-shifted lines. Recently, one of the NBI systems was modifi ed by the removal of the Faraday copper shield from the ion source. The comparison of the beam composition and the beamlet divergence before and after this modifi cation is also presented.

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“…The procedure to calculate the beam composition from the intensities of the Doppler shifted lines is described in more detail in Refs. [3][4][5][6].…”

Section: Doppler-shifted Spectral Linesmentioning

confidence: 99%

Energy composition of high-energy neutral beams on the COMPASS tokamak

et al. 2016

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“…Each particle fraction can be calculated as a function of the gas-target thickness for various particle energies, based on the law of conservation of particle number in each group, the evolution equation (Kim & Haselton, 1979;Williams, Geddes, & Gilbody, 1982;Yoo, Yang, & Hwang, 2000) (1) is:…”

Section: Calculation Of Beam Componentsmentioning

confidence: 99%

Beam Species Characteristics of High Current Ion Source for EAST Neutral Beam Injector

Wang¹,

Liu²,

Yan³

et al. 2016

APR

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During the experiment of high-current ion source on EAST NBI test bed, the Doppler shift spectroscopy (DSS) is used to measure the hydrogen alpha lines emitted by excited atoms. The multi-peak Gaussian fitting gives the distribution of the original DSS spectra data, the beam energy and the fractions of the beam species can be calculated for different operation parameters of ion source. It is known that the proton ratio increases with the arc power, the beam energy and the perveance, this phenomenon can provide a reference for higher power neutral beam extraction. According to the experimental results, the maximum proton ratio is near 78% under the arc power is about 65kW. This result indicates that the high-current ion source extraction match the design requirements.

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“…This model is rather insensitive to the assumed neutra.lizer thickness. Then the analytic solutions given by the ORNL neutral beam group [8], for the evolution of the eleven positive and neutral species are used to compute the total currents of atoms exiting the neutralizer.…”

Section: The Optical Multichannel Analyzer {Oma)mentioning

confidence: 99%