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Jarboe TR, Hansen CJ, Hossack AC, Marklin GJ, Morgan KD, Nelson BA, Sutherland DA, Victor BS. A Proof of Principle of Imposed Dynamo Current Drive: Demonstration of Sufficient Confinement. Fusion Science and Technology 2017. [DOI: 10.13182/fst14-782] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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)
- T. R. Jarboe
- University of Washington, Seattle, Washington 98195
| | - C. J. Hansen
- University of Washington, Seattle, Washington 98195
| | | | | | - K. D. Morgan
- University of Washington, Seattle, Washington 98195
| | - B. A. Nelson
- University of Washington, Seattle, Washington 98195
| | | | - B. S. Victor
- University of Washington, Seattle, Washington 98195
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2
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Raman R, Brown T, El-Guebaly LA, Jarboe TR, Nelson BA, Menard JE. Design Description for a Coaxial Helicity Injection Plasma Start-Up System for a ST-FNSF. Fusion Science and Technology 2017. [DOI: 10.13182/fst14-976] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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, USA
| | - T. Brown
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543, USA
| | - L. A. El-Guebaly
- University of Wisconsin, 1500 Engineering Dr., Madison, WI, 53706, USA
| | - T. R. Jarboe
- University of Washington, AERB 352250, Seattle, WA, 98195, USA
| | - B. A. Nelson
- University of Washington, AERB 352250, Seattle, WA, 98195, USA
| | - J. E. Menard
- Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08543, USA
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Raman R, Jarboe TR, Menard JE, Gerhardt SP, Ono M, Baylor L, Lay WS. Fast Time Response Electromagnetic Disruption Mitigation Concept. Fusion Science and Technology 2017. [DOI: 10.13182/fst14-916] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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, William E. Boeing Department of Aeronautics and Astronautics Seattle, Washington
| | - T. R. Jarboe
- University of Washington, William E. Boeing Department of Aeronautics and Astronautics Seattle, Washington
| | - J. E. Menard
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | - S. P. Gerhardt
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | - M. Ono
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | - L. Baylor
- Oak Ridge National Laboratory, Oak Ridge, Tennessee
| | - W.-S. Lay
- University of Washington, William E. Boeing Department of Aeronautics and Astronautics Seattle, Washington
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Raman R, Jarboe TR, Menard JE, Ono M, Taylor G, Nelson BA, Mueller D, Brown T. Simplifying the ST and AT Concepts. J Fusion Energ 2015. [DOI: 10.1007/s10894-015-0040-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Raman R, Jarboe TR, Nelson BA, Gerhardt SP, Lay WS, Plunkett GJ. Design and operation of a fast electromagnetic inductive massive gas injection valve for NSTX-U. Rev Sci Instrum 2014; 85:11E801. [PMID: 25430366 DOI: 10.1063/1.4885545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Results from the operation of an electromagnetic valve, that does not incorporate ferromagnetic materials, are presented. Image currents induced on a conducting disc placed near a pancake solenoid cause it to move away from the solenoid and open the vacuum seal. A new and important design feature is the use of Lip Seals for the sliding piston. The pressure rise in the test chamber is measured directly using a fast time response Baratron gauge. The valve injects over 200 Torr l of nitrogen in less than 3 ms, which remains unchanged at moderate magnetic fields.
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Affiliation(s)
- R Raman
- William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA
| | - T R Jarboe
- William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA
| | - B A Nelson
- William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA
| | - S P Gerhardt
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - W-S Lay
- William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA
| | - G J Plunkett
- William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA
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Victor BS, Jarboe TR, Hossack AC, Ennis DA, Nelson BA, Smith RJ, Akcay C, Hansen CJ, Marklin GJ, Hicks NK, Wrobel JS. Evidence for separatrix formation and sustainment with steady inductive helicity injection. Phys Rev Lett 2011; 107:165005. [PMID: 22107397 DOI: 10.1103/physrevlett.107.165005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Indexed: 05/31/2023]
Abstract
The first sustainment of toroidal plasma current of 50 kA at up to 3 times the injected currents, added in quadrature, using steady inductive helicity injection is described. Separatrix currents-currents not linking the helicity injectors-are sustained up to 40 kA. Decreases in the n=1 toroidal mode of the poloidal magnetic field at higher current amplifications indicate more quiescent, direct toroidal current drive. Results are achieved in HIT-SI (with a spheromak of major radius 0.3 m) during deuterium operations immediately after helium operation. These results represent a breakthrough in the development of this new current drive method for magnetic confinement fusion.
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Affiliation(s)
- B S Victor
- University of Washington, Seattle, Washington 98105, USA
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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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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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Mueller D, Raman R, Bell MG, Jarboe TR, LeBlanc B, Maqueda R, Sabbagh S, Nelson BA. NSTX Plasma Start-Up Using Transient Coaxial Helicity Injection. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1519] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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, Seattle, WA 98195
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Redd AJ, Jarboe TR, AboulHosn RZ, Akcay C, Hamp WT, Marklin GJ, Nelson BA, O′Neill RG, Sieck PE, Smith RJ, Stewart BT, Wrobel JS. Internal Fields in Helicity Injected Torus with Steady Inductive Helicity Injection (HIT-SI) Discharges. J Fusion Energ 2007. [DOI: 10.1007/s10894-007-9107-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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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Redd AJ, Jarboe TR, Hamp WT, Nelson BA, O’Neill RG, Sieck PE, Smith RJ, Sutphin GL, Wrobel JS. Overview of the Helicity Injected Torus (HIT) Program. J Fusion Energ 2006. [DOI: 10.1007/s10894-006-9049-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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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O’Neill RG, Smith RJ, Akcay C, Hamp WT, Aboul Hosn RZ, Jarboe TR, Redd AJ, Sieck PE, Sutphin GL, Wrobel JS. Overview of HIT-SI Diagnostic Systems. J Fusion Energ 2006. [DOI: 10.1007/s10894-006-9076-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nelson BA, Kim CC, Cassidy AP, Griffith SD, Milroy RD, Jarboe TR. The Plasma Science and Innovation Center Interfacing Group. J Fusion Energ 2006. [DOI: 10.1007/s10894-006-9044-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Marklin GJ, Jarboe TR. MHD Simulation with Insulated Conducting Boundaries and Circuit Interactions. J Fusion Energ 2006. [DOI: 10.1007/s10894-006-9067-9] [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: 10/23/2022]
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Raman R, Jarboe TR, Nelson BA, Bell MG, Mueller D. Solenoid-free Plasma Start-up in HIT-II and NSTX using Transient CHI. J Fusion Energ 2006. [DOI: 10.1007/s10894-006-9063-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Raman R, Nelson BA, Bell MG, Jarboe TR, Mueller D, Bigelow T, Leblanc B, Maqueda R, Menard J, Ono M, Wilson R. Efficient generation of closed magnetic flux surfaces in a large spherical tokamak using coaxial helicity injection. Phys Rev Lett 2006; 97:175002. [PMID: 17155478 DOI: 10.1103/physrevlett.97.175002] [Citation(s) in RCA: 5] [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: 02/27/2006] [Indexed: 05/12/2023]
Abstract
A method of coaxial helicity injection has successfully produced a closed flux current without the use of the central solenoid in the NSTX device, on a size scale closer to a spherical torus reactor, for a proof-of-principle demonstration of this concept. For the first time, a remarkable 60 times current multiplication factor was achieved. Grad-Shafranov plasma equilibrium reconstructions are used to verify the existence of closed flux current. In some discharges the generated current persists for a surprisingly long time approximately 400 ms.
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Affiliation(s)
- R Raman
- University of Washington, Seattle, Washington, USA
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Jarboe TR, Hamp WT, Marklin GJ, Nelson BA, O'neill RG, Redd AJ, Sieck PE, Smith RJ, Wrobel JS. Spheromak formation by steady inductive helicity injection. Phys Rev Lett 2006; 97:115003. [PMID: 17025894 DOI: 10.1103/physrevlett.97.115003] [Citation(s) in RCA: 6] [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: 02/01/2006] [Indexed: 05/12/2023]
Abstract
A spheromak is formed for the first time using a new steady state inductive helicity injection method. Using two inductive injectors with odd symmetry and oscillating at 5.8 kHz, a steady state spheromak with even symmetry is formed and sustained through nonlinear relaxation. A spheromak with about 13 kA of toroidal current is formed and sustained using about 3 MW of power. This is a much lower power threshold for spheromak production than required for electrode-based helicity injection. Internal magnetic probe data, including oscillations driven by the injectors, agree with the plasma being in the Taylor state. The agreement is remarkable considering the only fitting parameter is the amplitude of the spheromak component of the state.
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Affiliation(s)
- T R Jarboe
- University of Washington, Seattle, Washington 98195-2250, USA
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Raman R, Jarboe TR, Nelson BA, Izzo VA, O'Neill RG, Redd AJ, Smith RJ. Demonstration of plasma startup by coaxial helicity injection. Phys Rev Lett 2003; 90:075005. [PMID: 12633238 DOI: 10.1103/physrevlett.90.075005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2002] [Indexed: 05/24/2023]
Abstract
The first successful results on the transfer of a coaxial helicity injection (CHI) produced discharge to inductive operation are reported. CHI-assisted plasma startup is more robust than inductive only operation. After hand off for inductive operation, the initial 90 kA of CHI-produced current drops to 40 kA, then ramps up to 170 kA, using only 30 mV s, more than 30% higher than that produced by induction alone. These significant performance enhancing results were obtained on the HIT-II spherical torus experiment (major/minor radius of 0.3/0.2 m).
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Affiliation(s)
- R Raman
- University of Washington, Seattle, Washington 98195, USA
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Nelson BA, Jarboe TR, Orvis DJ, McCullough LA, Xie J, Zhang C, Zhou L. Formation and sustainment of a 150 kA tokamak by coaxial helicity injection. Phys Rev Lett 1994; 72:3666-3669. [PMID: 10056259 DOI: 10.1103/physrevlett.72.3666] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Wysocki FJ, Fernández JC, Henins I, Jarboe TR, Marklin GJ. Improved energy confinement in spheromaks with reduced field errors. Phys Rev Lett 1990; 65:40-43. [PMID: 10042167 DOI: 10.1103/physrevlett.65.40] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Wysocki FJ, Fernández JC, Henins I, Jarboe TR, Marklin GJ. Evidence for a pressure-driven instability in the CTX spheromak. Phys Rev Lett 1988; 61:2457-2460. [PMID: 10039123 DOI: 10.1103/physrevlett.61.2457] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Knox SO, Barnes CW, Marklin GJ, Jarboe TR, Henins I, Hoida HW, Wright BL. Observations of spheromak equilibria which differ from the minimum-energy state and have internal kink distortions. Phys Rev Lett 1986; 56:842-845. [PMID: 10033300 DOI: 10.1103/physrevlett.56.842] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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