Abstract
Magnetic axis shift (Shafranov shift) in a high density operational regime with an internal diffusion barrier (IDB) formation in Large Helical Device experiments has been studied using a two-dimensional imaging system composed of a soft x-ray CCD camera and beryllium filters. Magnetic axis positions are derived from the fitting of pre-calculated equilibria to measured (line-integrated) soft x-ray profiles assuming that the emissivity profile could be expressed by Fourier–Bessel series expansion. It has been clearly observed that the Shafranov shift in a plasma with IDB is much larger than that without IDB at a similar average beta value measured by a diamagnetic loop because of the strongly peaked pressure profile in this regime. According to systematic analyses of the Shafranov shift for various high density plasmas in this regime, the dependence of the Shafranov shift on the central beta value is summarized and compared with that in discharges without IDB.
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