2006
DOI: 10.1063/1.2221902
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Fast-ion D-alpha diagnostic for NSTX

Abstract: A fast-ion D-alpha ͑FIDA͒ diagnostic is under development for the National Spherical Torus Experiment ͑NSTX͒. The FIDA technique is a charge-exchange recombination spectroscopy measurement that exploits the large Doppler shift of Balmer-alpha light from energetic hydrogenic atoms to infer the fast-ion density. The principal objective of the NSTX installation is to measure the transport of beam ions caused by fast-ion driven instabilities; detection of perpendicular acceleration of fast ions during high harmoni… Show more

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Cited by 17 publications
(16 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: 53%
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: 53%
“…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: 98%
“…Although the acceleration was observed by both diagnostics, little information was obtained on the spatial profile of the absorption. With the installation of the NSTX fast-ion D-alpha (FIDA) diagnostic [16][17][18], radially resolved measurements of the fast-ion profile are now possible. FIDA measurements of accelerated beam ions by high harmonic cyclotron heating in DIII-D were recently published [15].…”
mentioning
confidence: 99%
“…An overview of the AUG diagnostics utilized in the present work is shown in Fig.1. FIDA spectroscopy has been recently developed at AUG [23] following the technique employed for the first time at DIII-D [21] and more recently at TEXTOR [24], NSTX [25], and LHD [26]. The upgraded AUG FILDs provide energy and pitch-angle resolved measurements of fast-ion losses with a bandwidth of 1MHz at 2 different toroidal positions and ≈30 cm above the midplane.…”
Section: Introductionmentioning
confidence: 99%