Direct measurement of the transition from edge to core power coupling in a light-ion helicon source

Piotrowicz, Pawel A.; Caneses, Juan F.; Showers, Melissa A.; Green, Davil L.; Goulding, Richard Howell; Caughman, John B. O.; Biewer, Theodore M.; Rapp, Juergen; Ruzic, David N.

doi:10.1063/1.5023924

Title: Direct measurement of the transition from edge to core power coupling in a light-ion helicon source

Journal Article · Wed May 02 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5023924· OSTI ID:1456815

Piotrowicz, Pawel A. ^[1];

^[2]; Showers, Melissa A. ^[2];

^[3];

^[3]; Ruzic, David N. ^[1]

Univ. of Illinois in Urbana-Champaign, Champaign, IL (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we present time-resolved measurements of an edge-to-core power transition in a light-ion (deuterium) helicon discharge in the form of infra-red camera imaging of a thin stainless steel target plate on the Proto-Material Exposure eXperiment device. The time-resolved images measure the two-dimensional distribution of power deposition in the helicon discharge. The discharge displays a mode transition characterized by a significant increase in the on-axis electron density and core power coupling, suppression of edge power coupling, and the formation of a fast-wave radial eigenmode. Although the self-consistent mechanism that drives this transition is not yet understood, the edge-to-core power transition displays characteristics that are consistent with the discharge entering a slow-wave anti-resonant regime. RF magnetic field measurements made across the plasma column, together with the power deposition results, provide direct evidence to support the suppression of the slow-wave in favor of core plasma production by the fast-wave in a light-ion helicon source.

View Accepted Manuscript (DOE)

View Accepted Manuscript (Publisher)

Cite

Export

Save

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1456815

Alternate ID(s):: OSTI ID: 1435671

Journal Information:: Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 13 works

Citation information provided by
Web of Science

References (30)

Upper Limit to Landau Damping in Helicon Discharges Chen, Francis F.; Blackwell, David D. Physical Review Letters, Vol. 82, Issue 13 https://doi.org/10.1103/PhysRevLett.82.2677	journal	March 1999
Physics of helicon discharges Chen, Francis F. Physics of Plasmas, Vol. 3, Issue 5 https://doi.org/10.1063/1.871697	journal	May 1996
Helicon mode formation and radio frequency power deposition in a helicon-produced plasma Niemi, K.; Krämer, M. Physics of Plasmas, Vol. 15, Issue 7 https://doi.org/10.1063/1.2947561	journal	July 2008
Helicon plasma source for ionized physical vapor deposition Hayden, D. B.; Juliano, D. R.; Neumann, M. N. Surface and Coatings Technology, Vol. 120-121 https://doi.org/10.1016/S0257-8972(99)00488-0	journal	November 1999
Equilibrium theory of cylindrical discharges with special application to helicons Curreli, Davide; Chen, Francis F. Physics of Plasmas, Vol. 18, Issue 11 https://doi.org/10.1063/1.3656941	journal	November 2011
Theoretical components of the VASIMR plasma propulsion concept Arefiev, Alexey V.; Breizman, Boris N. Physics of Plasmas, Vol. 11, Issue 5 https://doi.org/10.1063/1.1666328	journal	May 2004
Magnetic fluctuation probe design and capacitive pickup rejection Franck, Christian M.; Grulke, Olaf; Klinger, Thomas Review of Scientific Instruments, Vol. 73, Issue 11 https://doi.org/10.1063/1.1512341	journal	November 2002
The role of Trivelpiece–Gould waves in antenna coupling to helicon waves Arnush, Donald Physics of Plasmas, Vol. 7, Issue 7 https://doi.org/10.1063/1.874157	journal	July 2000
A new B-dot probe-based diagnostic for amplitude, polarization, and wavenumber measurements of ion cyclotron range-of frequency fields on ASDEX Upgrade Ochoukov, R.; Bobkov, V.; Faugel, H. Review of Scientific Instruments, Vol. 86, Issue 11 https://doi.org/10.1063/1.4935833	journal	November 2015
Contribution of slow waves on production of high-density plasmas by m=0 helicon waves Sakawa, Y.; Takino, T.; Shoji, T. Physics of Plasmas, Vol. 6, Issue 12 https://doi.org/10.1063/1.873763	journal	December 1999
Hot-Electron Production and Wave Structure in a Helicon Plasma Source Molvik, A. W.; Ellingboe, A. R.; Rognlien, T. D. Physical Review Letters, Vol. 79, Issue 2 https://doi.org/10.1103/PhysRevLett.79.233	journal	July 1997
Helicon antenna radiation patterns in a high-density hydrogen linear plasma device Caneses, J. F.; Blackwell, B. D.; Piotrowicz, P. Physics of Plasmas, Vol. 24, Issue 11 https://doi.org/10.1063/1.5000848	journal	November 2017
Volume and surface rf power absorption in a helicon plasma source Shamrai, Konstantin P.; Taranov, Vladimir B. Plasma Sources Science and Technology, Vol. 5, Issue 3 https://doi.org/10.1088/0963-0252/5/3/015	journal	August 1996
Collisional damping of helicon waves in a high density hydrogen linear plasma device Caneses, Juan F.; Blackwell, Boyd D. Plasma Sources Science and Technology, Vol. 25, Issue 5 https://doi.org/10.1088/0963-0252/25/5/055027	journal	September 2016
Plasma production in a toroidal heliac by helicon waves Loewenhardt, P.; Blackwell, B.; Boswell, R. Physical Review Letters, Vol. 67, Issue 20 https://doi.org/10.1103/PhysRevLett.67.2792	journal	November 1991
Ion-sound parametric turbulence and anomalous electron heating with application to helicon plasma sources Akhiezer, A. I.; Mikhailenko, V. S.; Stepanov, K. N. Physics Letters A, Vol. 245, Issue 1-2 https://doi.org/10.1016/S0375-9601(98)00437-X	journal	August 1998
Negative hydrogen ion production in a helicon plasma source Santoso, J.; Manoharan, R.; O'Byrne, S. Physics of Plasmas, Vol. 22, Issue 9 https://doi.org/10.1063/1.4931469	journal	September 2015
Radially Localized Helicon Modes in Nonuniform Plasma Breizman, Boris N.; Arefiev, Alexey V. Physical Review Letters, Vol. 84, Issue 17 https://doi.org/10.1103/PhysRevLett.84.3863	journal	April 2000
Stable modes and abrupt density jumps in a helicon plasma source Shamrai, Konstantin P. Plasma Sources Science and Technology, Vol. 7, Issue 4 https://doi.org/10.1088/0963-0252/7/4/008	journal	November 1998
Progress in the Development of a High Power Helicon Plasma Source for the Materials Plasma Exposure Experiment Goulding, R. H.; Caughman, J. B. O.; Rapp, J. Fusion Science and Technology, Vol. 72, Issue 4 https://doi.org/10.1080/15361055.2017.1352429	journal	August 2017
Heat flux estimates of power balance on Proto-MPEX with IR imaging Showers, M.; Biewer, T. M.; Caughman, J. B. O. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959953	journal	August 2016
Comparing experiments with modeling for light ion helicon plasma sources Carter, M. D.; Baity, F. W.; Barber, G. C. Physics of Plasmas, Vol. 9, Issue 12 https://doi.org/10.1063/1.1519539	journal	December 2002
Central peaking of magnetized gas discharges Chen, Francis F.; Curreli, Davide Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4801740	journal	May 2013
Generalized theory of helicon waves. I. Normal modes Chen, Francis F.; Arnush, Donald Physics of Plasmas, Vol. 4, Issue 9 https://doi.org/10.1063/1.872483	journal	September 1997
Investigation of a Light Gas Helicon Plasma Source for the VASIMR Space Propulsion System Squire, Jared P. RADIO FREQUENCY POWER IN PLASMAS: 15th Topical Conference on Radio Frequency Power in Plasmas, AIP Conference Proceedings https://doi.org/10.1063/1.1638071	conference	January 2003
Evidence for Trivelpiece-Gould Modes in a Helicon Discharge Blackwell, D. D.; Madziwa, T. G.; Arnush, D. Physical Review Letters, Vol. 88, Issue 14 https://doi.org/10.1103/PhysRevLett.88.145002	journal	March 2002
R&D around a photoneutralizer-based NBI system (Siphore) in view of a DEMO Tokamak steady state fusion reactor Simonin, A.; Achard, Jocelyn; Achkasov, K. Nuclear Fusion, Vol. 55, Issue 12 https://doi.org/10.1088/0029-5515/55/12/123020	journal	November 2015
rf Absorption and Ion Heating in Helicon Sources Kline, J. L.; Scime, E. E.; Boivin, R. F. Physical Review Letters, Vol. 88, Issue 19 https://doi.org/10.1103/PhysRevLett.88.195002	journal	April 2002
RF compensation of double Langmuir probes: modelling and experiment Caneses, Juan F.; Blackwell, Boyd Plasma Sources Science and Technology, Vol. 24, Issue 3 https://doi.org/10.1088/0963-0252/24/3/035024	journal	May 2015
Plasma source development for fusion-relevant material testing Caughman, John B. O.; Goulding, Richard H.; Biewer, Theodore M. Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 35, Issue 3 https://doi.org/10.1116/1.4982664	journal	May 2017

Cited By (4)

Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code Rapp, J.; Owen, L. W.; Canik, J. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5049808	journal	April 2019
Computational investigation of ion cyclotron heating on Proto-MPEX Piotrowicz, P. A.; Goulding, R. H.; Caneses, J. F. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5065784	journal	March 2019
Evidence of electron heating at different radial locations on Proto-MPEX Lau, C.; Caneses, J. F.; Bigelow, T. S. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5083814	journal	March 2019
Utilization of O-X-B mode conversion of 28 GHz microwaves to heat core electrons in the upgraded Proto-MPEX Biewer, T. M.; Lau, C.; Bigelow, T. S. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5093321	journal	May 2019

Similar Records

Helicon normal modes in Proto-MPEX

Journal Article · Tue May 22 00:00:00 EDT 2018 · Plasma Sources Science and Technology · OSTI ID:1456815

Piotrowicz, Pawel A.; Caneses, Juan F.; Green, David L.; +5 more

Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code

Journal Article · Tue Nov 14 00:00:00 EST 2017 · Physics of Plasmas · OSTI ID:1456815

Owen, Larry W.; Rapp, Juergen; Canik, John; +1 more

Wave modeling in a cylindrical non-uniform helicon discharge

Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Physics of Plasmas · OSTI ID:1456815

Chang, L; Hole, M J; Caneses, J F; +3 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
helicon plasma
MPEX
deuterium

Title: Direct measurement of the transition from edge to core power coupling in a light-ion helicon source

Citation Formats

References (30)

Cited By (4)

Similar Records

Related Subjects