A New Doppler Shift Spectroscopy for Measurement of Neutral Beam Profile

Shi, Yuejiang; Guang-Qi, Wang; Jia, Fei; Wu, Zhenwei; Chang, Jiafeng; Dan-Peng, Sun; Gao, Wei; Huang, J.; Zhou, Qian; Gao, Xiang; Wan, Baonian

doi:10.1088/0256-307x/24/6/055

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…The first tomographic reconstruction applied to a high power beam extracted from a positive ion source dates back to the 1980s: a visible tomographic diagnostic was developed for the JET neutral beam [10,11]. After that, tomography is discussed for the KSTAR NBI [12], and a general study of the diagnostic can be found in [13].…”

Section: Visible Tomography In Spider: Motivation and Requirementsmentioning

confidence: 99%

“…Then, by applying the SART method [Eq. (12)] the amplitudes of the Gaussians belonging to every pixel have been obtained: the result is shown in the right top panel of Fig. 6.…”

Section: A Nonuniform Phantommentioning

confidence: 99%

“…This is the signature of the dependence of the tomographic algorithm to large-k spatial patterns (small details), which is to be expected from an unconstrained inversion scheme such as that expressed by Eq. (12). This high-k dependence can be alleviated through a suitable regularization process, which is built in in the SVD method (cutoff of large k), and is a work in progress for the SART.…”

Section: A Nonuniform Phantommentioning

confidence: 99%

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Tomographic diagnostic of the hydrogen beam from a negative ion source

Agostini

Brombin

Serianni

et al. 2011

Phys. Rev. ST Accel. Beams

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In this paper the tomographic diagnostic developed to characterize the 2D density distribution of a particle beam from a negative ion source is described. In particular, the reliability of this diagnostic has been tested by considering the geometry of the source for the production of ions of deuterium extracted from an rf plasma (SPIDER). SPIDER is a low energy prototype negative ion source for the international thermonuclear experimental reactor (ITER) neutral beam injector, aimed at demonstrating the capability to create and extract a current of D À (H À ) ions up to 50 A (60 A) accelerated at 100 kV. The ions are extracted over a wide surface (1:52 Â 0:56 m 2 ) with a uniform plasma density which is prescribed to remain within 10% of the mean value. The main target of the tomographic diagnostic is the measurement of the beam uniformity with sufficient spatial resolution and of its evolution throughout the pulse duration. To reach this target, a tomographic algorithm based on the simultaneous algebraic reconstruction technique is developed and the geometry of the lines of sight is optimized so as to cover the whole area of the beam. Phantoms that reproduce different experimental beam configurations are simulated and reconstructed, and the role of the noise in the signals is studied. The simulated phantoms are correctly reconstructed and their two-dimensional spatial nonuniformity is correctly estimated, up to a noise level of 10% with respect to the signal.

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Section: Visible Tomography In Spider: Motivation and Requirementsmentioning

confidence: 99%

“…Then, by applying the SART method [Eq. (12)] the amplitudes of the Gaussians belonging to every pixel have been obtained: the result is shown in the right top panel of Fig. 6.…”

Section: A Nonuniform Phantommentioning

confidence: 99%

Section: A Nonuniform Phantommentioning

confidence: 99%

See 1 more Smart Citation

Tomographic diagnostic of the hydrogen beam from a negative ion source

Agostini

Brombin

Serianni

et al. 2011

Phys. Rev. ST Accel. Beams

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Preliminary results of beam component measurement on EAST NBI testbed using Doppler shift spectroscopy

Yuan

Zhuang

2014

Nuclear Instruments and Methods in Physics Research Section A:

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Measurement of diagnostic neutral beam parameters on J-TEXT

Wang

Cheng

et al. 2016

Review of Scientific Instruments

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A Doppler frequency shift spectrum (DFSS) system composed of two spectrometers has been developed for the joint Texas experimental tokamak to measure diagnostic neutral beam parameters including the beam energy fractions, intensity distributions, and divergences. The beam energy fractions are derived from measurements of H-alpha (Hα) emission using collisional excitation cross sections. The beam intensity distributions are obtained using an 11-channel measurement with a reconstruction technique. The beam divergences are obtained from spectrum broadening and geometric calculations. The results of preliminary investigations indicate that the DFSS system works well and can be used to obtain all of these parameters simultaneously. According to the preliminary experiment, the one-third energy fraction has the largest proportion (about 45%) of the beam energy and the full energy fraction is about 10%. The beam diameter is about 8.1 cm at a distance of 2.04 m from the accelerator. The beam divergence angle is about 3.3°. The current beam parameters are insufficient for charge-exchange measurements.

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A New Doppler Shift Spectroscopy for Measurement of Neutral Beam Profile

Cited by 3 publications

References 6 publications

Tomographic diagnostic of the hydrogen beam from a negative ion source

Tomographic diagnostic of the hydrogen beam from a negative ion source

Preliminary results of beam component measurement on EAST NBI testbed using Doppler shift spectroscopy

Measurement of diagnostic neutral beam parameters on J-TEXT

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