Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak

Bolte, Nathan G.; Heidbrink, William W.; Pace, David; Van Zeeland, Michael; Chen, Xi

doi:10.1088/0029-5515/56/11/112023

Title: Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak

Journal Article · Wed Sep 14 00:00:00 EDT 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/56/11/112023· OSTI ID:1371906

Bolte, Nathan G. ^[1]; Heidbrink, William W. ^[1]; Pace, David ^[2]; Van Zeeland, Michael ^[2]; Chen, Xi ^[2]

Univ. of California, Irvine, CA (United States)
General Atomics, San Diego, CA (United States)

Spectra of passive fast-ion D-alpha (FIDA) light from beam ions that charge exchange with background neutrals are measured and simulated. The fast ions come from three sources: ions that pass through the diagnostic sightlines on their first full orbit, an axisymmetric confined population, and ions that are expelled into the edge region by instabilities. A passive FIDA simulation (P-FIDASIM) is developed as a forward model for the spectra of the first-orbit fast ions and consists of an experimentally-validated beam deposition model, an ion orbit-following code, a collisional-radiative model, and a synthetic spectrometer. Model validation consists of the simulation of 86 experimental spectra that are obtained using 6 different neutral beam fast-ion sources and 13 different lines of sight. Calibrated spectra are used to estimate the neutral density throughout the cross-section of the tokamak. The resulting 2D neutral density shows the expected increase toward each X-point with average neutral densities of 8 X 10⁹ cm^-3 at the plasma boundary and 1 X 10¹¹ cm^-3 near the wall. Here, fast ions that are on passing orbits are expelled by the sawtooth instability more readily than trapped ions. In a sample discharge, approximately 1% of the fast-ion population is ejected into the high neutral density region per sawtooth crash.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Infrastructure Programs. Nuclear Facility Operations

Grant/Contract Number:: FC02-04ER54698; FG03-94ER54271

OSTI ID:: 1371906

Alternate ID(s):: OSTI ID: 1324334; OSTI ID: 1399485

Journal Information:: Nuclear Fusion, Vol. 56, Issue 11; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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On the scattering correction of fast-ion D-alpha signals on NSTX-U Hao, G. Z.; Heidbrink, W. W.; Liu, D. Review of Scientific Instruments, Vol. 89, Issue 6 https://doi.org/10.1063/1.5031879	journal	June 2018
Fast-ion D-alpha diagnostic development for the C-2W field-reversed configuration plasma Bolte, Nathan G.; Nations, Marcel; Gupta, Deepak Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036971	journal	October 2018
Fast ion D-alpha measurements using a bandpass-filtered system on EAST Zhang, J.; Huang, J.; Chang, J. F. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038828	journal	October 2018
Analysis of the Transition Time between the Space-Charge-Limited and Inverse Regimes Johnson, G. R.; Campanell, M. D. Plasma Physics Reports, Vol. 45, Issue 1 https://doi.org/10.1134/s1063780x19010033	journal	January 2019

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