Solenoid-free Plasma Start-up in NSTX using Transient CHI

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Experiments in NSTX have now demonstrated the coupling of toroidal plasmas produced by the technique of Coaxial Helicity Injection (CHI) to inductive sustainment and ramp-up of the toroidal plasma current. In these discharges, the central Ohmic transformer was used to apply an inductive loop voltage to discharges with a toroidal current of about 100 kA created by CHI. The coupled discharges have ramped up to >700 kA and transitioned into an H-mode demonstrating compatibility of this startup method with conventional operation. The electron temperature in the coupled discharges reached over 800 eV and the resulting plasma had low inductance, which ... continued below

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Raman, R; Jarboe, T; Nelson, B; Mueller, D & Soukhanovskii, V A January 5, 2009.

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Experiments in NSTX have now demonstrated the coupling of toroidal plasmas produced by the technique of Coaxial Helicity Injection (CHI) to inductive sustainment and ramp-up of the toroidal plasma current. In these discharges, the central Ohmic transformer was used to apply an inductive loop voltage to discharges with a toroidal current of about 100 kA created by CHI. The coupled discharges have ramped up to >700 kA and transitioned into an H-mode demonstrating compatibility of this startup method with conventional operation. The electron temperature in the coupled discharges reached over 800 eV and the resulting plasma had low inductance, which is preferred for long-pulse high performance discharges. These results from NSTX in combination with the previously obtained record 160 kA non-inductively-generated startup currents in an ST or tokamak in NSTX demonstrate that CHI is a viable solenoid-free plasma startup method for future STs and tokamaks.

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PDF-file: 18 pages; size: 0.5 Mbytes

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  • Journal Name: Nuclear Fusion, vol. 49, n/a, May 1, 2009, pp. 065006; Journal Volume: 49

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  • Report No.: LLNL-JRNL-409684
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1019054
  • Archival Resource Key: ark:/67531/metadc843016

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  • January 5, 2009

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 11:06 p.m.

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Raman, R; Jarboe, T; Nelson, B; Mueller, D & Soukhanovskii, V A. Solenoid-free Plasma Start-up in NSTX using Transient CHI, article, January 5, 2009; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc843016/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.