Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma
Abstract
Sawtooth mixing of fast ions is considered in ITER for plasma parameters close to the inductive 15 MA scenario. In this paper, new mixing formula is presented for a drift trajectory averaged distribution function (DF) of fast passing and trapped ions. This formula generalizes Kadomtsev's model for the case of non-circular magnetic surfaces, arbitrary aspect ratio, and significant deviations of charged particle drift trajectories from the magnetic flux surfaces, and can be applicable to a wide class of instabilities. Generalized formulae are implemented in the Fokker–Planck package three-dimensional (FPP-3D) code. FPP-3D is applied for calculation of the fast alpha-particle (He4), deuterium (D), and tritium (T) DFs. Simulations take into account D and T nuclear elastic scattering (NES or knock-on) by fast He4. Changes in the radial profile of He4 power deposition to the thermal plasma in the presence of plasma mixing are estimated. An effective tool for fast ion studies in ITER will be a system of neutral particle analyzers (NPA) since it allows direct measurements of the fast hydrogen ions' DF inside the plasma. The main NPA goal on ITER is to measure the D/T fuel isotope ratio in the plasma core with the use of D and Tmore »
- Authors:
-
- Ioffe Inst., St. Petersburg (Russian Federation)
- Russian Academy of Sciences (RAS), Moscow (Russian Federation). Scientific Research Inst. of System Development; Moscow State Univ., Moscow (Russian Federation). Dept. of Computational Mathematics and Cybernetics
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Ioffe Inst., St. Petersburg (Russian Federation); Russian Academy of Sciences (RAS), Moscow (Russian Federation)
- Sponsoring Org.:
- USDOE; Russian Academy of Sciences (RAS)
- OSTI Identifier:
- 1465685
- Grant/Contract Number:
- I.33
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 8; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER; sawtooth oscillations; alpha particles; knock-on ions; NPA; fuel ratio
Citation Formats
Mironov, M. I., Zaitsev, F. S., Gorelenkov, N. N., Afanasyev, V. I., Chernyshev, F. V., Nesenevich, V. G., and Petrov, M. P. Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aab678.
Mironov, M. I., Zaitsev, F. S., Gorelenkov, N. N., Afanasyev, V. I., Chernyshev, F. V., Nesenevich, V. G., & Petrov, M. P. Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma. United States. https://doi.org/10.1088/1741-4326/aab678
Mironov, M. I., Zaitsev, F. S., Gorelenkov, N. N., Afanasyev, V. I., Chernyshev, F. V., Nesenevich, V. G., and Petrov, M. P. Wed .
"Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma". United States. https://doi.org/10.1088/1741-4326/aab678. https://www.osti.gov/servlets/purl/1465685.
@article{osti_1465685,
title = {Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma},
author = {Mironov, M. I. and Zaitsev, F. S. and Gorelenkov, N. N. and Afanasyev, V. I. and Chernyshev, F. V. and Nesenevich, V. G. and Petrov, M. P.},
abstractNote = {Sawtooth mixing of fast ions is considered in ITER for plasma parameters close to the inductive 15 MA scenario. In this paper, new mixing formula is presented for a drift trajectory averaged distribution function (DF) of fast passing and trapped ions. This formula generalizes Kadomtsev's model for the case of non-circular magnetic surfaces, arbitrary aspect ratio, and significant deviations of charged particle drift trajectories from the magnetic flux surfaces, and can be applicable to a wide class of instabilities. Generalized formulae are implemented in the Fokker–Planck package three-dimensional (FPP-3D) code. FPP-3D is applied for calculation of the fast alpha-particle (He4), deuterium (D), and tritium (T) DFs. Simulations take into account D and T nuclear elastic scattering (NES or knock-on) by fast He4. Changes in the radial profile of He4 power deposition to the thermal plasma in the presence of plasma mixing are estimated. An effective tool for fast ion studies in ITER will be a system of neutral particle analyzers (NPA) since it allows direct measurements of the fast hydrogen ions' DF inside the plasma. The main NPA goal on ITER is to measure the D/T fuel isotope ratio in the plasma core with the use of D and T atom spectra in the MeV range. The spectra and their sensitivity to sawtooth mixing are calculated. It was found that ITER NPA allows us to detect those oscillations. Finally, simulations show the possibility of determining the D/T ratio with NPA regardless of whether sawtooth oscillations exist.},
doi = {10.1088/1741-4326/aab678},
journal = {Nuclear Fusion},
number = 8,
volume = 58,
place = {United States},
year = {Wed Mar 14 00:00:00 EDT 2018},
month = {Wed Mar 14 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Role of Hall effect on the resistive kink mode in tokamaks
journal, January 2020
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- Plasma Physics and Controlled Fusion, Vol. 62, Issue 2
Effect of sawtooth crashes on fast ion distribution in NSTX-U
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