Abstract
Abstract In the present paper the numerical calculations of magnetic field properties of the l = 2, m = 6 heliotron with irregular helical coil pitch, the magnetic system model of which significantly differs from the previous model, is carried out. The new model has the doubled length helical coil section with reduced helical coil pitch (doubled length L-section). A vertical magnetic field compensation scheme, elaborated for the operating l = 2, m = 2 torsatron U-2M with the additional toroidal magnetic field coils, has been applied to compensate the vertical magnetic field of the l = 2, m = 6 heliotron with doubled length L-section. The calculation results show that due to the defined relation between the ampere-turns in the compensation and in the helical coils the developed l = 2, m = 6 heliotron magnetic system with irregular helical coil pitch can provide some increase of the magnetic surface existence region. Also the pinch of the closed magnetic surface region and of the outer boundary of the stochastic field line layer takes place within lengthened L-section.
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