Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy

E. H. Martin; M. Goniche; C. C. Klepper; J. Hillairet; R. C. Isler; C. Bottereau; L. Colas; A. Ekedahl; S. Panayotis; B. Pegourie; Ph Lotte; G. Colledani; J. B. Caughman; J. H. Harris; D. L. Hillis; S. C. Shannon; F. Clairet; X. Litaudon

doi:10.1088/0741-3335/57/6/065011

Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy

E. H. Martin, M. Goniche, C. C. Klepper, J. Hillairet, R. C. Isler, C. Bottereau, L. Colas, A. Ekedahl, S. Panayotis, B. Pegourie, Ph Lotte, G. Colledani, J. B. Caughman, J. H. Harris, D. L. Hillis, S. C. Shannon, F. Clairet, X. Litaudon

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12 Scopus citations

Abstract

Interaction of radio-frequency (RF) waves with the plasma in the near-field of a high-power wave launcher is now seen to be an important topic, both in understanding the channeling of these waves through the plasma boundary and in avoiding power losses in the edge. In a recent Letter, a direct non-intrusive measurement of a near antenna RF electric field in the range of lower hybrid (LH) frequencies (E_LH) was announced (2013 Phys. Rev. Lett. 110 215005). This measurement was achieved through the fitting of Balmer series deuterium spectral lines utilizing a time dependent (dynamic) Stark effect model. In this article, the analysis of the spectral data is discussed in detail and applied to a larger range of measurements and the accuracy and limitations of the experimental technique are investigated. It was found through an analysis of numerous Tore Supra discharges that good quantitative agreement exists between the measured and full-wave modeled E_LH when the launched power exceeds 0.5 MW. For low power the measurement becomes inaccurate utilizing the implemented passive spectroscopic technique because the spectral noise overwhelms the effect of the RF electric field on the line profile. Additionally, effects of the ponderomotive force are suspected at sufficiently high power.

Original language	English
Article number	065011
Journal	Plasma Physics and Controlled Fusion
Volume	57
Issue number	6
DOIs	https://doi.org/10.1088/0741-3335/57/6/065011
State	Published - Jun 1 2015

Keywords

Tore Supra
electric field
lower hybrid current drive
optical emission spectroscopy

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10.1088/0741-3335/57/6/065011

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Martin, E. H., Goniche, M., Klepper, C. C., Hillairet, J., Isler, R. C., Bottereau, C., Colas, L., Ekedahl, A., Panayotis, S., Pegourie, B., Lotte, P., Colledani, G., Caughman, J. B., Harris, J. H., Hillis, D. L., Shannon, S. C., Clairet, F., & Litaudon, X. (2015). Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy. Plasma Physics and Controlled Fusion, 57(6), Article 065011. https://doi.org/10.1088/0741-3335/57/6/065011

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title = "Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy",

abstract = "Interaction of radio-frequency (RF) waves with the plasma in the near-field of a high-power wave launcher is now seen to be an important topic, both in understanding the channeling of these waves through the plasma boundary and in avoiding power losses in the edge. In a recent Letter, a direct non-intrusive measurement of a near antenna RF electric field in the range of lower hybrid (LH) frequencies (ELH) was announced (2013 Phys. Rev. Lett. 110 215005). This measurement was achieved through the fitting of Balmer series deuterium spectral lines utilizing a time dependent (dynamic) Stark effect model. In this article, the analysis of the spectral data is discussed in detail and applied to a larger range of measurements and the accuracy and limitations of the experimental technique are investigated. It was found through an analysis of numerous Tore Supra discharges that good quantitative agreement exists between the measured and full-wave modeled ELH when the launched power exceeds 0.5 MW. For low power the measurement becomes inaccurate utilizing the implemented passive spectroscopic technique because the spectral noise overwhelms the effect of the RF electric field on the line profile. Additionally, effects of the ponderomotive force are suspected at sufficiently high power.",

keywords = "Tore Supra, electric field, lower hybrid current drive, optical emission spectroscopy",

author = "Martin, {E. H.} and M. Goniche and Klepper, {C. C.} and J. Hillairet and Isler, {R. C.} and C. Bottereau and L. Colas and A. Ekedahl and S. Panayotis and B. Pegourie and Ph Lotte and G. Colledani and Caughman, {J. B.} and Harris, {J. H.} and Hillis, {D. L.} and Shannon, {S. C.} and F. Clairet and X. Litaudon",

note = "Publisher Copyright: {\textcopyright} 2015 IOP Publishing Ltd.",

year = "2015",

month = jun,

day = "1",

doi = "10.1088/0741-3335/57/6/065011",

language = "English",

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Martin, EH, Goniche, M, Klepper, CC, Hillairet, J, Isler, RC, Bottereau, C, Colas, L, Ekedahl, A, Panayotis, S, Pegourie, B, Lotte, P, Colledani, G, Caughman, JB , Harris, JH, Hillis, DL, Shannon, SC, Clairet, F & Litaudon, X 2015, 'Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy', Plasma Physics and Controlled Fusion, vol. 57, no. 6, 065011. https://doi.org/10.1088/0741-3335/57/6/065011

TY - JOUR

T1 - Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy

AU - Martin, E. H.

AU - Goniche, M.

AU - Klepper, C. C.

AU - Hillairet, J.

AU - Isler, R. C.

AU - Bottereau, C.

AU - Colas, L.

AU - Ekedahl, A.

AU - Panayotis, S.

AU - Pegourie, B.

AU - Lotte, Ph

AU - Colledani, G.

AU - Caughman, J. B.

AU - Harris, J. H.

AU - Hillis, D. L.

AU - Shannon, S. C.

AU - Clairet, F.

AU - Litaudon, X.

PY - 2015/6/1

Y1 - 2015/6/1

N2 - Interaction of radio-frequency (RF) waves with the plasma in the near-field of a high-power wave launcher is now seen to be an important topic, both in understanding the channeling of these waves through the plasma boundary and in avoiding power losses in the edge. In a recent Letter, a direct non-intrusive measurement of a near antenna RF electric field in the range of lower hybrid (LH) frequencies (ELH) was announced (2013 Phys. Rev. Lett. 110 215005). This measurement was achieved through the fitting of Balmer series deuterium spectral lines utilizing a time dependent (dynamic) Stark effect model. In this article, the analysis of the spectral data is discussed in detail and applied to a larger range of measurements and the accuracy and limitations of the experimental technique are investigated. It was found through an analysis of numerous Tore Supra discharges that good quantitative agreement exists between the measured and full-wave modeled ELH when the launched power exceeds 0.5 MW. For low power the measurement becomes inaccurate utilizing the implemented passive spectroscopic technique because the spectral noise overwhelms the effect of the RF electric field on the line profile. Additionally, effects of the ponderomotive force are suspected at sufficiently high power.

AB - Interaction of radio-frequency (RF) waves with the plasma in the near-field of a high-power wave launcher is now seen to be an important topic, both in understanding the channeling of these waves through the plasma boundary and in avoiding power losses in the edge. In a recent Letter, a direct non-intrusive measurement of a near antenna RF electric field in the range of lower hybrid (LH) frequencies (ELH) was announced (2013 Phys. Rev. Lett. 110 215005). This measurement was achieved through the fitting of Balmer series deuterium spectral lines utilizing a time dependent (dynamic) Stark effect model. In this article, the analysis of the spectral data is discussed in detail and applied to a larger range of measurements and the accuracy and limitations of the experimental technique are investigated. It was found through an analysis of numerous Tore Supra discharges that good quantitative agreement exists between the measured and full-wave modeled ELH when the launched power exceeds 0.5 MW. For low power the measurement becomes inaccurate utilizing the implemented passive spectroscopic technique because the spectral noise overwhelms the effect of the RF electric field on the line profile. Additionally, effects of the ponderomotive force are suspected at sufficiently high power.

KW - Tore Supra

KW - electric field

KW - lower hybrid current drive

KW - optical emission spectroscopy

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U2 - 10.1088/0741-3335/57/6/065011

DO - 10.1088/0741-3335/57/6/065011

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SN - 0741-3335

VL - 57

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 6

M1 - 065011

ER -

Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy

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