2011
DOI: 10.1088/0741-3335/53/10/105004
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Comparison of measured and simulated fast ion velocity distributions in the TEXTOR tokamak

Abstract: Here we demonstrate a comprehensive comparison of collective Thomson scattering (CTS) measurements with steady-state Monte Carlo simulations performed with the ASCOT and VENUS codes. The measurements were taken at a location on the magnetic axis as well as at an off-axis location, using two projection directions at each location. The simulations agree with the measurements on-axis, but for the off-axis geometries discrepancies are observed for both projection directions. For the near perpendicular projection d… Show more

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Cited by 32 publications
(32 citation statements)
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“…A possibly spurious peak at p = −0.5 is present as also observed in figure 4(b). Figure 5(b) shows a first-order Tikhonov inversion with the null-measurement constraint according to equation (6). The inversion shows a clear peak at full injection energy and a clear ridge consistent with ions slowing down due to collisions with electrons.…”
Section: High-definition Inversions Using Prior Informationmentioning
confidence: 99%
“…A possibly spurious peak at p = −0.5 is present as also observed in figure 4(b). Figure 5(b) shows a first-order Tikhonov inversion with the null-measurement constraint according to equation (6). The inversion shows a clear peak at full injection energy and a clear ridge consistent with ions slowing down due to collisions with electrons.…”
Section: High-definition Inversions Using Prior Informationmentioning
confidence: 99%
“…The particle following Monte Carlo code ASCOT [1,2,3] has been used to simulate NBI in several fusion devices including ITER [3], ASDEX Upgrade (AUG) [4], Joint European Torus (JET) [5,6], DIII-D [7], and TEXTOR [8]. Until recently, however, the initial test particle ensemble for ASCOT had to be obtained from an external code, e.g.…”
Section: Introductionmentioning
confidence: 99%
“…At relatively large frequency shifts, here roughly beyond ±0.5 GHz, CTS measurements provide information about fast, nonthermal ion populations, e.g. from neutral beam heating [4][5][6][7][8][9][10][11][12][13][14] or from fusion reactions in future experiments with burning plasmas [15][16][17][18][19] . At lower frequency shifts, in the bulk ion region of the spectrum, CTS measurements provide information about thermal ion populations including properties such as the ion temperature and drift a) mspe@fysik.dtu.dk velocity (i.e.…”
mentioning
confidence: 99%