Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak
Abstract
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 highmore »
- Authors:
-
- Univ. of California, Irvine, CA (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Infrastructure Programs. Nuclear Facility Operations
- OSTI Identifier:
- 1371906
- Alternate Identifier(s):
- OSTI ID: 1324334; OSTI ID: 1399485
- Grant/Contract Number:
- FC02-04ER54698; FG03-94ER54271
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 11; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; passive FIDA; edge light; neutral density; FIDASIM; FIDA; sawtooth crash; fast ion losses
Citation Formats
Bolte, Nathan G., Heidbrink, William W., Pace, David, Van Zeeland, Michael, and Chen, Xi. Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak. United States: N. p., 2016.
Web. doi:10.1088/0029-5515/56/11/112023.
Bolte, Nathan G., Heidbrink, William W., Pace, David, Van Zeeland, Michael, & Chen, Xi. Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak. United States. https://doi.org/10.1088/0029-5515/56/11/112023
Bolte, Nathan G., Heidbrink, William W., Pace, David, Van Zeeland, Michael, and Chen, Xi. Wed .
"Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak". United States. https://doi.org/10.1088/0029-5515/56/11/112023. https://www.osti.gov/servlets/purl/1371906.
@article{osti_1371906,
title = {Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak},
author = {Bolte, Nathan G. and Heidbrink, William W. and Pace, David and Van Zeeland, Michael and Chen, Xi},
abstractNote = {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.},
doi = {10.1088/0029-5515/56/11/112023},
journal = {Nuclear Fusion},
number = 11,
volume = 56,
place = {United States},
year = {Wed Sep 14 00:00:00 EDT 2016},
month = {Wed Sep 14 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
On the scattering correction of fast-ion D-alpha signals on NSTX-U
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Fast-ion D-alpha diagnostic development for the C-2W field-reversed configuration plasma
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Fast ion D-alpha measurements using a bandpass-filtered system on EAST
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Analysis of the Transition Time between the Space-Charge-Limited and Inverse Regimes
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