Solenoid-free Plasma Startup in NSTX using Coaxial Helicity Injection
Authors: Roger Raman, Thomas R. Jarboe, Michael G. Bell, Dennis Mueller, Brian A. Nelson, Benoit LeBlanc, Charles Bush, Masayoshi Nagata, and Ted Biewer
Date of PPPL Report: January 2005
Published in: Institute of Electrical Engineers of Japan (IEEJ) Transactions on Fundamentals and Materials 125:11 (2005) 895-902.
Presented at the Tenth International Spherical Torus Workshop (STW2004), 28 September - 1 October 2004 at Kyoto University, Kyoto, Japan.
The favorable properties of the Spherical Torus (ST) arise from its very small aspect ratio. However, small aspect ratio devices have very restricted space for a substantial central solenoid. Thus methods for initiating the plasma current without relying on induction from a central solenoid are essential for the viability of the ST concept. Coaxial Helicity Injection (CHI) is a promising candidate for solenoid-free plasma startup in a ST. Recent experiments on the HIT-II ST at the University of Washington, have demonstrated the capability of a new method, referred to as transient CHI, to produce a high quality, closed-flux equilibrium that has then been coupled to induction, with a reduced requirement for transformer flux [R. Raman, T.R. Jarboe, B.A. Nelson, et al., Phys. Rev. Lett. 90 (February 2003) 075005-1]. An initial test of this method on the National Spherical Torus Experiment (NSTX) has produced about 140 kA of toroidal current. Modifications are now underway to improve capability for transient CHI in NSTX.