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Control and data acquisition upgrades for NSTX-U. FUSION ENGINEERING AND DESIGN 2016. [DOI: 10.1016/j.fusengdes.2016.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Menard JE, Wang Z, Liu Y, Bell RE, Kaye SM, Park JK, Tritz K. Rotation and kinetic modifications of the tokamak ideal-wall pressure limit. PHYSICAL REVIEW LETTERS 2014; 113:255002. [PMID: 25554890 DOI: 10.1103/physrevlett.113.255002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Indexed: 06/04/2023]
Abstract
The impact of toroidal rotation, energetic ions, and drift-kinetic effects on the tokamak ideal wall mode stability limit is considered theoretically and compared to experiment for the first time. It is shown that high toroidal rotation can be an important destabilizing mechanism primarily through the angular velocity shear; non-Maxwellian fast ions can also be destabilizing, and drift-kinetic damping can potentially offset these destabilization mechanisms. These results are obtained using the unique parameter regime accessible in the spherical torus NSTX of high toroidal rotation speed relative to the thermal and Alfvén speeds and high kinetic pressure relative to the magnetic pressure. Inclusion of rotation and kinetic effects significantly improves agreement between measured and predicted ideal stability characteristics and may provide new insight into tearing mode triggering.
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Affiliation(s)
- J E Menard
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - Z Wang
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - Y Liu
- Culham Centre for Fusion Energy, Culham Science Centre, Abingdon OX14 3DB, United Kingdom
| | - R E Bell
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - S M Kaye
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - J-K Park
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - K Tritz
- Johns Hopkins University, Baltimore, Maryland 21218, USA
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Davis W, Ko M, Maqueda R, Roquemore A, Scotti F, Zweben S. Fast 2-D camera control, data acquisition, and database techniques for edge studies on NSTX. FUSION ENGINEERING AND DESIGN 2014. [DOI: 10.1016/j.fusengdes.2013.11.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Davis W. Easy web interfaces to IDL code for NSTX Data Analysis. FUSION ENGINEERING AND DESIGN 2012. [DOI: 10.1016/j.fusengdes.2012.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kalling R, Evans T, Orlov D, Schissel D, R.Maingi, Menard J, Sabbagh S. Accelerating the numerical simulation of magnetic field lines in tokamaks using the GPU. FUSION ENGINEERING AND DESIGN 2011. [DOI: 10.1016/j.fusengdes.2011.03.064] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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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. JOURNAL OF FUSION ENERGY 2010. [DOI: 10.1007/s10894-010-9306-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Davis W, Patel R, Boeglin W, Roquemore A, Maqueda R, Zweben S. Advances in fast 2D camera data handling and analysis on NSTX. FUSION ENGINEERING AND DESIGN 2010. [DOI: 10.1016/j.fusengdes.2010.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [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. PHYSICAL REVIEW LETTERS 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] [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, LeBlanc B, Maqueda R, Menard J, Ono M, Nagata M, Roquemore L, Soukhanovskii V. Solenoid-free Plasma Start-up in NSTX using Transient CHI. JOURNAL OF FUSION ENERGY 2008. [DOI: 10.1007/s10894-008-9182-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Davis W, Mastrovito D, Roney P, Sichta P. A software Event Summation System for MDSplus. FUSION ENGINEERING AND DESIGN 2008. [DOI: 10.1016/j.fusengdes.2007.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Plasma Start-up in HIT-II and NSTX Using Transient Coaxial Helicity Injection. JOURNAL OF FUSION ENERGY 2007. [DOI: 10.1007/s10894-007-9106-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Crocker NA, Peebles WA, Kubota S, Fredrickson ED, Kaye SM, LeBlanc BP, Menard JE. Three-wave interactions between fast-ion modes in the National Spherical Torus Experiment. PHYSICAL REVIEW LETTERS 2006; 97:045002. [PMID: 16907581 DOI: 10.1103/physrevlett.97.045002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Indexed: 05/11/2023]
Abstract
Simultaneous bursts of energetic particle mode (EPM) and toroidicity-induced Alfvén eigenmode (TAE) activity that correlate with significant fast-ion loss are observed in beam heated plasmas. Three-wave interactions between these modes are conclusively identified, indicating fixed phase relationships. This nonlinear coupling concentrates the energy of the TAEs into a toroidally localized perturbation frozen in the frame of a rigid, toroidally rotating structure formed by the EPMs. This redistribution of energy is significant because it will modify the effect of the TAEs on fast-ion loss.
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Affiliation(s)
- N A Crocker
- University of California, Los Angeles, California 90095-7099, USA
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Mastrovito D, Davis W, Dong J, Roney P, Sichta P. Integrating EPICS and MDSplus. FUSION ENGINEERING AND DESIGN 2006. [DOI: 10.1016/j.fusengdes.2006.04.042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Davis W, Mastrovito D, Bush C, Gates D, Maqueda R, Menard J, Nishino N, Roney P, Roquemore A, Sabbagh S, Stratton B, Zweben S. Storage and analysis techniques for fast 2D camera data on NSTX. FUSION ENGINEERING AND DESIGN 2006. [DOI: 10.1016/j.fusengdes.2006.04.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Davis W, Roney P, Carroll T, Gibney T, Mastrovito D. The use of MDSplus on NSTX at PPPL. FUSION ENGINEERING AND DESIGN 2002. [DOI: 10.1016/s0920-3796(02)00016-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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National Spherical Torus Experiment: engineering overview and research results 1999–2000. FUSION ENGINEERING AND DESIGN 2001. [DOI: 10.1016/s0920-3796(01)00411-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Neumeyer C, Heitzenroeder P, Spitzer J, Chrzanowski J, Brooks A, Bialek J, Fan H, Barnes G, Viola M, Nelson B, Goranson P, Wilson R, Fredd E, Dudek L, Parsells R, Kalish M, Blanchard W, Kaita R, Kugel H, McCormack B, Ramakrishnan S, Hatcher R, Oliaro G, Perry E, Egebo T, Von Halle A, Williams M, Ono M. Engineering design of the National Spherical Torus Experiment. FUSION ENGINEERING AND DESIGN 2001. [DOI: 10.1016/s0920-3796(00)00469-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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