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Maan A, Boyle D, Majeski R, Banerjee S, Franscisquez M, Kaita R, Wilkie G, Capecchi W, Kubota S, Hansen C, Soukhanovskii V. Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment- β (LTX- β ). Nuclear Materials and Energy 2023. [DOI: 10.1016/j.nme.2023.101408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Kaita R, Lucia M, Allain J, Bedoya F, Bell R, Boyle D, Capece A, Jaworski M, Koel B, Majeski R, Roszell J, Schmitt J, Scotti F, Skinner C, Soukhanovskii V. Hydrogen retention in lithium on metallic walls from “in vacuo” analysis in LTX and implications for high-Z plasma-facing components in NSTX-U. Fusion Engineering and Design 2017. [DOI: 10.1016/j.fusengdes.2016.06.056] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Flesch K, Kremeyer T, Schmitz O, Soukhanovskii V, Wenzel U. Development of miniaturized, spectroscopically assisted Penning gauges for fractional helium and hydrogen neutral pressure measurements. Rev Sci Instrum 2016; 87:11E529. [PMID: 27910409 DOI: 10.1063/1.4960815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Direct measurements of the helium (He) fractional neutral pressure in the neutral gas around fusion devices is challenging because of the small mass difference between the abundant D2 molecules and the He ash which will be produced by deuterium-tritium fusion. To study He exhaust, an in situ Penning gauge system is being developed at UW-Madison that is optimized for good pressure and high spectroscopic sensitivity. Three different anode geometries have been studied regarding their vacuum electrostatic fields, light output, and ion current. The light output of the two new anode configurations are at least one order of magnitude above the currently available designs, hence improving the spectroscopic sensitivity at similar total neutral pressure resolution.
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Affiliation(s)
- K Flesch
- Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - T Kremeyer
- Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - O Schmitz
- Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - V Soukhanovskii
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - U Wenzel
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany
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Surla V, Jaworski M, Soukhanovskii V, Gray T, Kaita R, Kallman J, Kugel H, McLean A, Ruzic D, Scotti F. Characterization of transient particle loads during lithium experiments on the National Spherical Torus Experiment. Fusion Engineering and Design 2012. [DOI: 10.1016/j.fusengdes.2012.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ono M, Bell M, Kaita R, Kugel H, Ahn JW, Allain J, Battaglia D, Bell R, Canik J, Ding S, Gerhardt S, Gray T, Guttenfelder W, Hosea J, Jaworski M, Kallman J, Kaye S, LeBlanc B, Maingi R, Mansfield D, McLean A, Menard J, Muller D, Nelson B, Nygren R, Paul S, Raman R, Ren Y, Ryan P, Sabbagh S, Scotti F, Skinner C, Soukhanovskii V, Surla V, Taylor C, Timberlake J, Yuh H, Zakharov L. Recent progress of NSTX lithium program and opportunities for magnetic fusion research. Fusion Engineering and Design 2012. [DOI: 10.1016/j.fusengdes.2011.10.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Majeski R, Kugel H, Kaita R, Avasarala S, Bell M, Bell R, Berzak L, Beiersdorfer P, Gerhardt S, Granstedt E, Gray T, Jacobson C, Kallman J, Kaye S, Kozub T, LeBlanc B, Lepson J, Lundberg D, Maingi R, Mansfield D, Paul S, Pereverzev G, Schneider H, Soukhanovskii V, Strickler T, Stotler D, Timberlake J, Zakharov L. The impact of lithium wall coatings on NSTX discharges and the engineering of the Lithium Tokamak eXperiment (LTX). Fusion Engineering and Design 2010. [DOI: 10.1016/j.fusengdes.2010.03.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Raman R, Jarboe TR, Nelson BA, Mueller D, Roquemore L, Soukhanovskii V. Demonstration of Plasma Start-up in HIT-II and NSTX Using Transient Coaxial Helicity Injection. J Fusion Energ 2010. [DOI: 10.1007/s10894-010-9306-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Raman R, Mueller D, Nelson BA, Jarboe TR, Gerhardt S, Kugel HW, Leblanc B, Maingi R, Menard J, Ono M, Paul S, Roquemore L, Sabbagh S, Soukhanovskii V. Demonstration of Tokamak ohmic flux saving by transient coaxial helicity injection in the national spherical torus experiment. Phys Rev Lett 2010; 104:095003. [PMID: 20366991 DOI: 10.1103/physrevlett.104.095003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Indexed: 05/29/2023]
Abstract
Transient coaxial helicity injection (CHI) started discharges in the National Spherical Torus Experiment (NSTX) have attained peak currents up to 300 kA and when coupled to induction, it has produced up to 200 kA additional current over inductive-only operation. CHI in NSTX has shown to be energetically quite efficient, producing a plasma current of about 10 A/J of capacitor bank energy. In addition, for the first time, the CHI-produced toroidal current that couples to induction continues to increase with the energy supplied by the CHI power supply at otherwise similar values of the injector flux, indicating the potential for substantial current generation capability by CHI in NSTX and in future toroidal devices.
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Affiliation(s)
- R Raman
- University of Washington, Seattle, Washington, USA.
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Raman R, Nelson BA, Mueller D, Jarboe TR, Bell MG, Menard J, Ono M, Bell R, Gates D, LeBlanc B, Maingi R, Maqueda R, Nagata M, Roquemore L, Sabbagh S, Soukhanovskii V. Solenoid-Less Plasma Start-Up in NSTX Using Transient CHI. Fusion Science and Technology 2009. [DOI: 10.13182/fst09-a8954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R. Raman
- University of Washington: AERB 352250, Seattle, WA, 98195,
| | - B. A. Nelson
- University of Washington: AERB 352250, Seattle, WA, 98195,
| | - D. Mueller
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - T. R. Jarboe
- University of Washington: AERB 352250, Seattle, WA, 98195,
| | - M. G. Bell
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - J. Menard
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - M. Ono
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - R. Bell
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - D. Gates
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - B. LeBlanc
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
| | - R. Maingi
- Oak Ridge National Laboratory, Oak Ridge, TN
| | | | | | - L. Roquemore
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543
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Kugel H, Bell M, Berzak L, Brooks A, Ellis R, Gerhardt S, Harjes H, Kaita R, Kallman J, Maingi R, Majeski R, Mansfield D, Menard J, Nygren R, Soukhanovskii V, Stotler D, Wakeland P, Zakharov L. Physics design requirements for the National Spherical Torus Experiment liquid lithium divertor. Fusion Engineering and Design 2009. [DOI: 10.1016/j.fusengdes.2008.11.102] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Raman R, Nelson BA, Mueller D, Jarboe TR, Bell MG, LeBlanc B, Maqueda R, Menard J, Ono M, Nagata M, Roquemore L, Soukhanovskii V. Solenoid-free Plasma Start-up in NSTX using Transient CHI. J Fusion Energ 2008. [DOI: 10.1007/s10894-008-9182-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Majeski R, Doerner R, Gray T, Kaita R, Maingi R, Mansfield D, Spaleta J, Soukhanovskii V, Timberlake J, Zakharov L. Enhanced energy confinement and performance in a low-recycling tokamak. Phys Rev Lett 2006; 97:075002. [PMID: 17026238 DOI: 10.1103/physrevlett.97.075002] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Indexed: 05/12/2023]
Abstract
Extensive lithium wall coatings and liquid lithium plasma-limiting surfaces reduce recycling, with dramatic improvements in Ohmic plasma discharges in the Current Drive Experiment-Upgrade. Global energy confinement times increase by up to 6 times. These results exceed confinement scalings such as ITER98P(y,1) by 2-3 times, and represent the largest increase in energy confinement ever observed for an Ohmic tokamak plasma. Measurements of Dalpha emission indicate that global recycling coefficients decrease to approximately 0.3, the lowest documented for a magnetically confined hydrogen plasma.
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Affiliation(s)
- R Majeski
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
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Majeski R, Boaz M, Hoffman D, Jones B, Kaita R, Kugel H, Munsat T, Spaleta J, Soukhanovskii V, Timberlake J, Zakharov L, Antar G, Doerner R, Luckhardt S, Conn R, Finkenthal M, Stutman D, Maingi R, Ulrickson M. Plasma performance improvements with liquid lithium limiters in CDX-U. Fusion Engineering and Design 2003. [DOI: 10.1016/s0920-3796(03)00016-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kaita R, Majeski R, Boaz M, Efthimion P, Jones B, Hoffman D, Kugel H, Menard J, Munsat T, Post-Zwicker A, Soukhanovskii V, Spaleta J, Taylor G, Timberlake J, Woolley R, Zakharov L, Finkenthal M, Stutman D, Antar G, Doerner R, Luckhardt S, Maingi R, Maiorano M, Smith S. Spherical torus plasma interactions with large-area liquid lithium surfaces in CDX-U. Fusion Engineering and Design 2002. [DOI: 10.1016/s0920-3796(02)00117-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Antar G, Doerner R, Kaita R, Majeski R, Spaleta J, Munsat T, Jones B, Maingi R, Soukhanovskii V, Kugel H, Timberlake J, Krasheninnikov S, Luckhardt S, Conn R. Plasma–lithium interaction in the CDX-U spherical torus. Fusion Engineering and Design 2002. [DOI: 10.1016/s0920-3796(02)00055-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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