Characterization of the helicon plasma flux to the target of Proto-MPEX

Beers, Clyde J.; Lindquist, Elizabeth G.; Biewer, Theodore M.; Caneses, Juan F.; Caughman, John B. O.; Goulding, Richard Howell; Kafle, Nischal; Ray, Holly B.; Showers, Melissa A.; Zinkle, Steven J.; Rapp, Juergen

doi:10.1016/j.fusengdes.2018.11.056

Characterization of the helicon plasma flux to the target of Proto-MPEX

Journal Article · Fri Dec 07 23:00:00 EST 2018 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2018.11.056· OSTI ID:1486956

^[1]; ^[1]; ^[2]; ^[2]; ^[2]; ^[2]; Kafle, Nischal ^[1]; Ray, Holly B. ^[1]; Showers, Melissa A. ^[1]; ^[3]; ^[2]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 10²³ m^–2s^-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. As a result, this fall-off distance of ~2–4 cm and the dissociation and ionization mean free path of D₂ being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.

View Accepted Manuscript (DOE)

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:: 1486956

Journal Information:: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Journal Issue: C Vol. 138; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (25)

Properties of thin a-C/Si:H coatings applied to TEXTOR von Seggern, J.; Winter, J.; Grobusch, L. Journal of Nuclear Materials, Vol. 220-222 https://doi.org/10.1016/0022-3115(94)00564-8	journal	April 1995
Impurity release and recycling behaviour in TEXTOR-94 with siliconised walls Philipps, V.; Huber, A.; Esser, H. G. Journal of Nuclear Materials, Vol. 290-293 https://doi.org/10.1016/S0022-3115(00)00555-9	journal	March 2001
Material erosion at the vessel walls of future fusion devices Behrisch, R.; Federici, G.; Kukushkin, A. Journal of Nuclear Materials, Vol. 313-316 https://doi.org/10.1016/S0022-3115(02)01580-5	journal	March 2003
New linear plasma devices in the trilateral euregio cluster for an integrated approach to plasma surface interactions in fusion reactors Unterberg, B.; Jaspers, R.; Koch, R. Fusion Engineering and Design, Vol. 86, Issue 9-11 https://doi.org/10.1016/j.fusengdes.2011.03.082	journal	October 2011
Physics basis and design of the ITER plasma-facing components Pitts, R. A.; Carpentier, S.; Escourbiac, F. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2011.01.114	journal	August 2011
Transport simulations of linear plasma generators with the B2.5-Eirene and EMC3-Eirene codes Rapp, J.; Owen, L. W.; Bonnin, X. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.12.058	journal	August 2015
Ratio of Balmer line intensities resulting from dissociative excitation of molecular hydrogen in an ionizing plasma Fujimoto, Takashi; Sawada, Keiji; Takahata, Kiyoto Journal of Applied Physics, Vol. 66, Issue 6 https://doi.org/10.1063/1.344289	journal	September 1989
Improved analysis techniques for cylindrical and spherical double probes Beal, Brian; Johnson, Lee; Brown, Daniel Review of Scientific Instruments, Vol. 83, Issue 7 https://doi.org/10.1063/1.4739221	journal	July 2012
First results from the Thomson scattering diagnostic on proto-MPEX Biewer, T. M.; Meitner, S.; Rapp, J. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959163	journal	August 2016
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
Helicon plasma ion temperature measurements and observed ion cyclotron heating in proto-MPEX Beers, C. J.; Goulding, R. H.; Isler, R. C. Physics of Plasmas, Vol. 25, Issue 1 https://doi.org/10.1063/1.4994541	journal	January 2018
Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code Owen, L. W.; Rapp, J.; Canik, J. Physics of Plasmas, Vol. 24, Issue 11 https://doi.org/10.1063/1.5002534	journal	November 2017
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
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
Evidence for volume recombination in JET detached divertor plasmas McCracken, G. M.; Stamp, M. F.; Monk, R. D. Nuclear Fusion, Vol. 38, Issue 4 https://doi.org/10.1088/0029-5515/38/4/311	journal	April 1998
Pump plenum pressure dependence on divertor plasma parameters and magnetic geometry in the DIII-D tokamak Maingi, R.; Watkins, J. G.; Mahdavi, M. A. Nuclear Fusion, Vol. 39, Issue 9 https://doi.org/10.1088/0029-5515/39/9/311	journal	September 1999
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
Power accounting of plasma discharges in the linear device Proto-MPEX Showers, M.; Piotrowicz, P. A.; Beers, C. J. Plasma Physics and Controlled Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1361-6587/aab7c8	journal	April 2018
Helicon normal modes in Proto-MPEX Piotrowicz, P. A.; Caneses, J. F.; Green, D. L. Plasma Sources Science and Technology, Vol. 27, Issue 5 https://doi.org/10.1088/1361-6595/aabd62	journal	May 2018
Developing the science and technology for the Material Plasma Exposure eXperiment Rapp, J.; Biewer, T. M.; Bigelow, T. S. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7b1c	journal	July 2017
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
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
Wall Conditioning on TEXTOR Philipps, V. Fusion Science and Technology, Vol. 47, Issue 2 https://doi.org/10.13182/FST05-A693	journal	February 2005
Chapter 6: Scrape-Off Layer Transport on JET Fundamenski, W. Fusion Science and Technology, Vol. 53, Issue 4 https://doi.org/10.13182/FST08-A1746	journal	May 2008
Plasma Characterization in Divertor Simulation Experiments with a V-Shaped Target on GAMMA 10/PDX Sakamoto, M.; Oki, K.; Nakashima, Y. Fusion Science and Technology, Vol. 63, Issue 1T https://doi.org/10.13182/FST13-A16902	journal	May 2013

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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