2010
DOI: 10.1088/0029-5515/50/3/035012
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Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Abstract: Abstract. Collective Thomson scattering (CTS) experiments were carried out at ASDEX Upgrade to measure the one-dimensional velocity distribution functions of fast ion populations. These measurements are compared with simulations using the codes TRANSP/NUBEAM and ASCOT for two different neutral beam injection (NBI) configurations: two NBI sources and only one NBI source. The measured CTS spectra as well as the inferred one-dimensional fast ion velocity distribution functions are clearly asymmetric as a conseque… Show more

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Cited by 79 publications
(104 citation statements)
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“…Our tomographic and theoretical results contradict the conventional wisdom that at least two CTS or FIDA views would necessarily be required for tomography of fast-ion velocity distribution functions [12,[22][23][24][25][26][27][28][29][30][31][32]. In an idealized situation in fact just one single CTS or FIDA view suffices to compute an accurate tomography.…”
Section: Discussioncontrasting
confidence: 56%
See 1 more Smart Citation
“…Our tomographic and theoretical results contradict the conventional wisdom that at least two CTS or FIDA views would necessarily be required for tomography of fast-ion velocity distribution functions [12,[22][23][24][25][26][27][28][29][30][31][32]. In an idealized situation in fact just one single CTS or FIDA view suffices to compute an accurate tomography.…”
Section: Discussioncontrasting
confidence: 56%
“…In [24] reconstructions from two and three synthetic CTS views have been shown to contain salient features of the underlying 2D fast-ion velocity distribution functions in idealized situations. It has since become conventional wisdom that a 2D velocity distribution function could not be found from one single 1D CTS or FIDA view and that at least two CTS or FIDA views with different projection directions would be necessary for that [12,[22][23][24][25][26][27][28][29][30][31][32]. We demonstrate that in fact just one single 1D CTS or FIDA view theoretically suffices to compute tomographies of almost the entire discrete 2D velocity distribution function under idealized conditions.…”
Section: Introductionmentioning
confidence: 91%
“…ASDEX Upgrade is also equipped with a suite of fast-ion diagnostics: fast-ion loss detectors (FILDs) [4][5][6], fast-ion D α (FIDA) [7], collective Thomson scattering (CTS) [8][9][10][11][12][13], neutron spectrometry [14,15], neutral particle analysers (NPA) [16,17] and γ -ray spectrometry [18]. These auxiliary heating systems and fast-ion diagnostics give unique opportunities to study fast ions in tokamak plasmas.…”
Section: Introductionmentioning
confidence: 99%
“…Higher frequency bands are also of interest but the diagnostic solutions for these bands are technologically difficult and expensive. An example of a receiver operating at 100-110 GHz is that of the collective Thomson scattering (CTS) diagnostic at ASDEX Upgrade [1,2,[6][7][8][9][10][11]. It can detect spectral power densities of a few eV against the electron cyclotron emission (ECE) background on the order of 100 eV under presence of gyrotron stray radiation that is many orders of magnitude stronger than the signal to be detected.…”
Section: Introductionmentioning
confidence: 99%