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

Martin, Elijah H.; Goniche, M.; Klepper, C. Christopher; Hillairet, J.; Isler, Ralph C.; Bottereau, C.; Colas, L.; Ekedahl, A.; Panayotis, S.; Pegourie, B.; Lotte, Ph.; Colledani, G.; Caughman, J. B. O.; Harris, Jeffrey H.; Hillis, Donald Lee; Shannon, S.C.; Clairet, F.; Litaudon, X.

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

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

Journal Article · Wed Apr 22 00:00:00 EDT 2015 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/57/6/065011· OSTI ID:1185838

Martin, Elijah H. ^[1]; Goniche, M. ^[2]; Klepper, C. Christopher ^[1]; Hillairet, J. ^[2]; Isler, Ralph C. ^[1]; Bottereau, C. ^[2]; Colas, L. ^[2]; Ekedahl, A. ^[2]; Panayotis, S. ^[2]; Pegourie, B. ^[2]; Lotte, Ph. ^[2]; Colledani, G. ^[2]; Caughman, J. B. O. ^[1]; Harris, Jeffrey H. ^[1]; Hillis, Donald Lee ^[1]; Shannon, S.C. ^[3]; Clairet, F. ^[2]; Litaudon, X. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Alternative Energies and Atomic Energy Commission (CEA), Saint Paul-Lez-Durance (France). Inst. for Magnetic Fusion Research (IRFM)
North Carolina State Univ., Raleigh, NC (United States)

Interaction of radio-frequency (RF) waves with the plasma in the near-field of a high-power wave launcher is now seen to be important, 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 (Phys. Rev. Lett., 110:215005, 2013). The measurement was achieved through the fitting of Balmer series deuterium spectral lines utilizing a time dependent (dynamic) Stark effect model. In this article, the processing 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 is investigated. We find through an analysis of numerous Tore Supra pulses that good quantitative agreement exists between the measured and full-wave modeled $$E_{LH}$$ when the launched power exceeds 0.5MW. For low power the measurement becomes formidable 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185838

Alternate ID(s):: OSTI ID: 1238880

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 57, Issue 6; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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References (22)

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Cited By (4)

Polarization Stark spectroscopy for spatially resolved measurements of electric fields in the sheaths of ICRF antenna Kostic, A.; Crombé, K.; Dux, R. Review of Scientific Instruments, Vol. 90, Issue 12 https://doi.org/10.1063/1.5123659	journal	December 2019
Full-wave model for the lower hybrid wave electric field vector with synthetic turbulence on Alcator C-Mod Lau, C.; Martin, E. H.; Shiraiwa, S. Nuclear Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1741-4326/ab6481	journal	January 2020
Experimental evidence of lower hybrid wave scattering in Alcator C-Mod due to scrape off layer density fluctuations Martin, E. H.; Lau, C.; Wallace, G. M. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab16a2	journal	May 2019
A spectroscopic electric field vector imaging diagnostic for electron cyclotron heating systems Martin, E. H.; Lau, C.; Brookman, M. W. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038670	journal	October 2018

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