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Author(s):
M. Yokoyama, K. Itoh, S. Okamura, K. Matsuoka and S. -I. Itoh
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Title:
Maximum-J Capability in a Quasi-Axisymmetric Stellarator
Date of publication:
May 2001
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Key words:
QA stellarator, Maximum-J criterion, non-axisymmetry of the magnetic field strength, external controllability
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Abstract:
Maximum-J (J is the second adiabatic invariant) capability, i.e., the radial derivative of J has the same sign as that of pressure, is investigated in a quasi-axisymmetric (QA) stellarator to investigate improved confinement. Due to the existence of non-axisymmetry of the magnetic field strength, a local maximum of J is created to cause the drift reversal. External controllability of Maximum-J condition is also demonstrated, by which impact of magnetic configuration on turbulent transport can be studied.
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