Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection: Paper

B. Madsen; J. Huang; Mirko Salewski; H. Järleblad; P.C. Hansen; L. Stagner; J. Su; J. F. Chang; J. Fu; J. F. Wang; L. Z. Liang; G. Q. Zhong; Y. Y. Li; B. Lyu; H. Q. Liu; Q. Zang; Z. P. Luo; M. Nocente; D. Moseev; T. S. Fan; Y. M. Zhang; D. Yang; J. Q. Sun; L. Y. Liao

doi:10.1088/1361-6587/abb79b

Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection: Paper

B. Madsen^*, J. Huang, Mirko Salewski, H. Järleblad, P.C. Hansen, L. Stagner, J. Su, J. F. Chang, J. Fu, J. F. Wang, L. Z. Liang, G. Q. Zhong, Y. Y. Li, B. Lyu, H. Q. Liu, Q. Zang, Z. P. Luo, M. Nocente, D. Moseev, T. S. FanY. M. Zhang, D. Yang, J. Q. Sun, L. Y. Liao

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

We demonstrate 2D reconstructions of the fast-ion velocity distribution from two-view fast-ion D-alpha (FIDA) measurements at the EAST tokamak. By expressing the distribution in a basis relying on the fast-ion slowing-down process in fusion plasmas, the smoothness and velocity-space resolution of reconstructions are improved. We reconstruct distributions of fast ions born from simultaneous co- and counter-current neutral beam injection and detect the expected distinct change in fast-ion birth pitch when comparing discharges utilizing different neutral beam injectors. For purely co-current injection, we find a good agreement between TRANSP-predicted and reconstructed fast-ion densities, pressures and current densities for energies above 20 keV. We furthermore illustrate the improvement of the reconstructed high-energy range (> 40 keV) of the distribution by combining FIDA with neutron emission spectroscopy measurements with the compact single-plate EJ301 scintillator.

Original language	English
Article number	115019
Journal	Plasma Physics and Controlled Fusion
Volume	62
Issue number	11
Number of pages	14
ISSN	0741-3335
DOIs	https://doi.org/10.1088/1361-6587/abb79b
Publication status	Published - 2020

Keywords

Velocity-space tomography
Fast-ion D-alpha spectroscopy
Fast ions
Slowing-down regularization
EAST tokamak

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Madsen, B., Huang, J., Salewski, M., Järleblad, H., Hansen, P. C., Stagner, L., Su, J., Chang, J. F., Fu, J., Wang, J. F., Liang, L. Z., Zhong, G. Q., Li, Y. Y., Lyu, B., Liu, H. Q., Zang, Q., Luo, Z. P., Nocente, M., Moseev, D., ... Liao, L. Y. (2020). Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection: Paper. Plasma Physics and Controlled Fusion, 62(11), [115019 ]. https://doi.org/10.1088/1361-6587/abb79b

Madsen, B. ; Huang, J. ; Salewski, Mirko ; Järleblad, H. ; Hansen, P.C. ; Stagner, L. ; Su, J. ; Chang, J. F. ; Fu, J. ; Wang, J. F. ; Liang, L. Z. ; Zhong, G. Q. ; Li, Y. Y. ; Lyu, B. ; Liu, H. Q. ; Zang, Q. ; Luo, Z. P. ; Nocente, M. ; Moseev, D. ; Fan, T. S. ; Zhang, Y. M. ; Yang, D. ; Sun, J. Q. ; Liao, L. Y. / Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection : Paper. In: Plasma Physics and Controlled Fusion. 2020 ; Vol. 62, No. 11.

@article{eb9bd16e0ce14339a5ec7e35444b7cbd,

title = "Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection: Paper",

abstract = "We demonstrate 2D reconstructions of the fast-ion velocity distribution from two-view fast-ion D-alpha (FIDA) measurements at the EAST tokamak. By expressing the distribution in a basis relying on the fast-ion slowing-down process in fusion plasmas, the smoothness and velocity-space resolution of reconstructions are improved. We reconstruct distributions of fast ions born from simultaneous co- and counter-current neutral beam injection and detect the expected distinct change in fast-ion birth pitch when comparing discharges utilizing different neutral beam injectors. For purely co-current injection, we find a good agreement between TRANSP-predicted and reconstructed fast-ion densities, pressures and current densities for energies above 20 keV. We furthermore illustrate the improvement of the reconstructed high-energy range (> 40 keV) of the distribution by combining FIDA with neutron emission spectroscopy measurements with the compact single-plate EJ301 scintillator.",

keywords = "Velocity-space tomography, Fast-ion D-alpha spectroscopy, Fast ions, Slowing-down regularization, EAST tokamak",

author = "B. Madsen and J. Huang and Mirko Salewski and H. J{\"a}rleblad and P.C. Hansen and L. Stagner and J. Su and Chang, {J. F.} and J. Fu and Wang, {J. F.} and Liang, {L. Z.} and Zhong, {G. Q.} and Li, {Y. Y.} and B. Lyu and Liu, {H. Q.} and Q. Zang and Luo, {Z. P.} and M. Nocente and D. Moseev and Fan, {T. S.} and Zhang, {Y. M.} and D. Yang and Sun, {J. Q.} and Liao, {L. Y.}",

year = "2020",

doi = "10.1088/1361-6587/abb79b",

language = "English",

volume = "62",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing",

number = "11",

}

Madsen, B, Huang, J, Salewski, M , Järleblad, H , Hansen, PC, Stagner, L, Su, J, Chang, JF, Fu, J, Wang, JF, Liang, LZ, Zhong, GQ, Li, YY, Lyu, B, Liu, HQ, Zang, Q, Luo, ZP, Nocente, M, Moseev, D, Fan, TS, Zhang, YM, Yang, D, Sun, JQ & Liao, LY 2020, 'Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection: Paper', Plasma Physics and Controlled Fusion, vol. 62, no. 11, 115019 . https://doi.org/10.1088/1361-6587/abb79b

Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection : Paper. / Madsen, B.; Huang, J.; Salewski, Mirko ; Järleblad, H.; Hansen, P.C.; Stagner, L.; Su, J.; Chang, J. F.; Fu, J.; Wang, J. F.; Liang, L. Z.; Zhong, G. Q.; Li, Y. Y.; Lyu, B.; Liu, H. Q.; Zang, Q.; Luo, Z. P.; Nocente, M.; Moseev, D.; Fan, T. S.; Zhang, Y. M.; Yang, D.; Sun, J. Q.; Liao, L. Y.

In: Plasma Physics and Controlled Fusion, Vol. 62, No. 11, 115019 , 2020.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection

T2 - Paper

AU - Madsen, B.

AU - Huang, J.

AU - Salewski, Mirko

AU - Järleblad, H.

AU - Hansen, P.C.

AU - Stagner, L.

AU - Su, J.

AU - Chang, J. F.

AU - Fu, J.

AU - Wang, J. F.

AU - Liang, L. Z.

AU - Zhong, G. Q.

AU - Li, Y. Y.

AU - Lyu, B.

AU - Liu, H. Q.

AU - Zang, Q.

AU - Luo, Z. P.

AU - Nocente, M.

AU - Moseev, D.

AU - Fan, T. S.

AU - Zhang, Y. M.

AU - Yang, D.

AU - Sun, J. Q.

AU - Liao, L. Y.

PY - 2020

Y1 - 2020

N2 - We demonstrate 2D reconstructions of the fast-ion velocity distribution from two-view fast-ion D-alpha (FIDA) measurements at the EAST tokamak. By expressing the distribution in a basis relying on the fast-ion slowing-down process in fusion plasmas, the smoothness and velocity-space resolution of reconstructions are improved. We reconstruct distributions of fast ions born from simultaneous co- and counter-current neutral beam injection and detect the expected distinct change in fast-ion birth pitch when comparing discharges utilizing different neutral beam injectors. For purely co-current injection, we find a good agreement between TRANSP-predicted and reconstructed fast-ion densities, pressures and current densities for energies above 20 keV. We furthermore illustrate the improvement of the reconstructed high-energy range (> 40 keV) of the distribution by combining FIDA with neutron emission spectroscopy measurements with the compact single-plate EJ301 scintillator.

AB - We demonstrate 2D reconstructions of the fast-ion velocity distribution from two-view fast-ion D-alpha (FIDA) measurements at the EAST tokamak. By expressing the distribution in a basis relying on the fast-ion slowing-down process in fusion plasmas, the smoothness and velocity-space resolution of reconstructions are improved. We reconstruct distributions of fast ions born from simultaneous co- and counter-current neutral beam injection and detect the expected distinct change in fast-ion birth pitch when comparing discharges utilizing different neutral beam injectors. For purely co-current injection, we find a good agreement between TRANSP-predicted and reconstructed fast-ion densities, pressures and current densities for energies above 20 keV. We furthermore illustrate the improvement of the reconstructed high-energy range (> 40 keV) of the distribution by combining FIDA with neutron emission spectroscopy measurements with the compact single-plate EJ301 scintillator.

KW - Velocity-space tomography

KW - Fast-ion D-alpha spectroscopy

KW - Fast ions

KW - Slowing-down regularization

KW - EAST tokamak

U2 - 10.1088/1361-6587/abb79b

DO - 10.1088/1361-6587/abb79b

M3 - Journal article

VL - 62

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 11

M1 - 115019

ER -