Demonstration of 300 kA CHI-startup current, coupling to transformer drive and flux savings on NSTX

B. A. Nelson; T. R. Jarboe; D. Mueller; R. Raman; M. Bell; J. Menard; M. Ono; A. L. Roquemore; V. Soukhanovskii; H. Yuh

doi:10.1088/0029-5515/51/6/063008

Demonstration of 300 kA CHI-startup current, coupling to transformer drive and flux savings on NSTX

B. A. Nelson, T. R. Jarboe, D. Mueller, R. Raman, M. Bell, J. Menard, M. Ono, A. L. Roquemore, V. Soukhanovskii, H. Yuh

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18 Scopus citations

Abstract

Discharges formed by transient coaxial helicity injection (CHI) in the National Spherical Torus Experiment (NSTX) have attained peak currents of 300 kA for the first time. CHI-started discharges are coupled to induction, and ramped up to over 1 MA. Up to an additional 400 kA of toroidal current is produced, compared with discharges with the same inductive drive without CHI. These CHI-inductively coupled discharges demonstrate flux savings over standard NSTX inductive-only discharges, requiring significantly less transformer flux to reach 1 MA of toroidal current, as well as exhibiting higher elongation and lower internal inductance. These results indicate the potential for substantial current generation capability by CHI in NSTX and in future toroidal devices.

Original language	English (US)
Article number	063008
Journal	Nuclear Fusion
Volume	51
Issue number	6
DOIs	https://doi.org/10.1088/0029-5515/51/6/063008
State	Published - Jun 2011

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/51/6/063008

Cite this

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title = "Demonstration of 300 kA CHI-startup current, coupling to transformer drive and flux savings on NSTX",

abstract = "Discharges formed by transient coaxial helicity injection (CHI) in the National Spherical Torus Experiment (NSTX) have attained peak currents of 300 kA for the first time. CHI-started discharges are coupled to induction, and ramped up to over 1 MA. Up to an additional 400 kA of toroidal current is produced, compared with discharges with the same inductive drive without CHI. These CHI-inductively coupled discharges demonstrate flux savings over standard NSTX inductive-only discharges, requiring significantly less transformer flux to reach 1 MA of toroidal current, as well as exhibiting higher elongation and lower internal inductance. These results indicate the potential for substantial current generation capability by CHI in NSTX and in future toroidal devices.",

author = "Nelson, \{B. A.\} and Jarboe, \{T. R.\} and D. Mueller and R. Raman and M. Bell and J. Menard and M. Ono and Roquemore, \{A. L.\} and V. Soukhanovskii and H. Yuh",

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language = "English (US)",

volume = "51",

journal = "Nuclear Fusion",

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T1 - Demonstration of 300 kA CHI-startup current, coupling to transformer drive and flux savings on NSTX

AU - Nelson, B. A.

AU - Jarboe, T. R.

AU - Mueller, D.

AU - Raman, R.

AU - Bell, M.

AU - Menard, J.

AU - Ono, M.

AU - Roquemore, A. L.

AU - Soukhanovskii, V.

AU - Yuh, H.

PY - 2011/6

Y1 - 2011/6

N2 - Discharges formed by transient coaxial helicity injection (CHI) in the National Spherical Torus Experiment (NSTX) have attained peak currents of 300 kA for the first time. CHI-started discharges are coupled to induction, and ramped up to over 1 MA. Up to an additional 400 kA of toroidal current is produced, compared with discharges with the same inductive drive without CHI. These CHI-inductively coupled discharges demonstrate flux savings over standard NSTX inductive-only discharges, requiring significantly less transformer flux to reach 1 MA of toroidal current, as well as exhibiting higher elongation and lower internal inductance. These results indicate the potential for substantial current generation capability by CHI in NSTX and in future toroidal devices.

AB - Discharges formed by transient coaxial helicity injection (CHI) in the National Spherical Torus Experiment (NSTX) have attained peak currents of 300 kA for the first time. CHI-started discharges are coupled to induction, and ramped up to over 1 MA. Up to an additional 400 kA of toroidal current is produced, compared with discharges with the same inductive drive without CHI. These CHI-inductively coupled discharges demonstrate flux savings over standard NSTX inductive-only discharges, requiring significantly less transformer flux to reach 1 MA of toroidal current, as well as exhibiting higher elongation and lower internal inductance. These results indicate the potential for substantial current generation capability by CHI in NSTX and in future toroidal devices.

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DO - 10.1088/0029-5515/51/6/063008

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SN - 0029-5515

VL - 51

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 6

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ER -

Demonstration of 300 kA CHI-startup current, coupling to transformer drive and flux savings on NSTX

Abstract

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