Ion Fluxes and Neutral Gas Ionization Efficiency of the 100-kW Light-Ion Helicon Plasma Source Concept for the Material Plasma Exposure eXperiment

Caneses Marin, Juan; Piotrowicz, Pawel A.; Biewer, Theodore; Goulding, Richard; Lau, Cornwall; Showers, Melissa A.; Rapp, Juergen

doi:10.1080/15361055.2019.1622988

Title: Ion Fluxes and Neutral Gas Ionization Efficiency of the 100-kW Light-Ion Helicon Plasma Source Concept for the Material Plasma Exposure eXperiment

Journal Article · Fri Jun 28 00:00:00 EDT 2019 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2019.1622988· OSTI ID:1648975

^[1]; Piotrowicz, Pawel A. ^[2];

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^[1]; Showers, Melissa A. ^[3];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Illinois at Urbana-Champaign, IL (United States). Center for Plasma-Material Interactions
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Linear plasma devices are cost-effective alternatives for testing materials under reactor-relevant divertor plasma conditions. In this work, we describe how an intense radio-frequency (RF) plasma source concept for the Material Plasma Exposure eXperiment (MPEX) is under development at Oak Ridge National Laboratory. The source concept, Proto-MPEX, aims to produce high-density background deuterium helicon plasmas $(n_{e} > 3 \times 10^{19} m^{- 3})$ that are subsequently heated with additional RF and microwave systems to deliver reactor-relevant conditions for studies on plasma-material interaction. In this work, we focus on the plasma-producing stage and its effectiveness in converting input neutral gas into plasma, namely, the neutral gas ionization efficiency. We provide a direct quantitative measurement of the ionization efficiency by measuring the total ion flux arriving at the target region relative to the neutral gas injected at the source. Using 80 kW at 13.56 MHz and a source magnetic field of 0.05 T, the helicon plasma source delivers ion fluxes up to $1 \times 10^{24} m^{- 2} s^{- 1}$ and heat fluxes greater than 1 $M W m^{- 2}$ to a target plate located 2 m away from the source. Under these conditions, we observe that the plasma source converts ~89% of the input neutral gas into plasma that arrives at the target as ion flux at a rate of $_{} 5 \times 10^{20} s^{- 1}$ . We demonstrate that because of the large pumping capacity of the plasma, neutral gas pumping systems are required only in the target region to maintain optimal plasma operation.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1648975

Journal Information:: Fusion Science and Technology, Vol. 75, Issue 7; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (20)

High power light gas helicon plasma source for VASIMR Squire, Jared P.; Chang-Díaz, Franklin R.; Glover, Timothy W. Thin Solid Films, Vol. 506-507 https://doi.org/10.1016/j.tsf.2005.08.061	journal	May 2006
Spectroscopic characterization of H ₂ and D ₂ helicon plasmas generated by a resonant antenna for neutral beam applications in fusion Marini, C.; Agnello, R.; Duval, B. P. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa53eb	journal	January 2017
Experimental and theoretical determination of the efficiency of a sub-atmospheric flowing high power cascaded arc hydrogen plasma source Vijvers, W. A. J.; Schram, D. C.; Shumack, A. E. Plasma Sources Science and Technology, Vol. 19, Issue 6 https://doi.org/10.1088/0963-0252/19/6/065016	journal	November 2010
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
Divertor conditions relevant for fusion reactors achieved with linear plasma generator van Eck, H. J. N.; Kleyn, A. W.; Lof, A. Applied Physics Letters, Vol. 101, Issue 22 https://doi.org/10.1063/1.4768302	journal	November 2012
Ambipolar ion acceleration in an expanding magnetic nozzle Longmier, Benjamin W.; Bering, Edgar A.; Carter, Mark D. Plasma Sources Science and Technology, Vol. 20, Issue 1 https://doi.org/10.1088/0963-0252/20/1/015007	journal	January 2011
Low pressure hydrogen discharges diluted with argon explored using a global model Hjartarson, A. T.; Thorsteinsson, E. G.; Gudmundsson, J. T. Plasma Sources Science and Technology, Vol. 19, Issue 6 https://doi.org/10.1088/0963-0252/19/6/065008	journal	November 2010
Helicon wave-generated plasmas for negative ion beams for fusion Furno, Ivo; Agnello, Riccardo; Fantz, U. EPJ Web of Conferences, Vol. 157 https://doi.org/10.1051/epjconf/201715703014	journal	January 2017
Observations of electron heating during 28 GHz microwave power application in proto-MPEX Biewer, T. M.; Bigelow, T. S.; Caneses, J. F. Physics of Plasmas, Vol. 25, Issue 2 https://doi.org/10.1063/1.5018479	journal	February 2018
Direct measurement of the transition from edge to core power coupling in a light-ion helicon source Piotrowicz, P. A.; Caneses, J. F.; Showers, M. A. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5023924	journal	May 2018
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 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
Relations between the ionization or recombination flux and the emission radiation for hydrogen and helium in plasma Goto, Motoshi; Sawada, Keiji; Fujimoto, Takashi Physics of Plasmas, Vol. 9, Issue 10 https://doi.org/10.1063/1.1507588	journal	October 2002
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
Observations of single-pass ion cyclotron heating in a trans-sonic flowing plasma Bering, E. A.; Díaz, F. R. Chang; Squire, J. P. Physics of Plasmas, Vol. 17, Issue 4 https://doi.org/10.1063/1.3389205	journal	April 2010
The Development of the Material Plasma Exposure Experiment Rapp, Juergen; Biewer, T. M.; Bigelow, T. S. IEEE Transactions on Plasma Science, Vol. 44, Issue 12 https://doi.org/10.1109/TPS.2016.2628326	journal	December 2016
Differential pumping requirements for the light-ion helicon source and heating systems of Proto-MPEX Caneses, J. F.; Piotrowicz, P. A.; Biewer, T. M. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5001519	journal	August 2018
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
Optimization of the output and efficiency of a high power cascaded arc hydrogen plasma source Vijvers, W. A. J.; van Gils, C. A. J.; Goedheer, W. J. Physics of Plasmas, Vol. 15, Issue 9 https://doi.org/10.1063/1.2979703	journal	September 2008

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