Abstract. Flux jumps lead to [10][11][12][13][14][15][16][17][18][19][20]

The superconducting current breaking effect at pulsed field magnetization of HTS annuli was carefully investigated. It is proposed the simple model for qualitative description of this process. In particular, it is shown the appearance of a narrow sector of the considerable heating through which the magnetic flux penetrates into the superconducting annuli. Introduction.Hard superconductors of type-II have the thermomagnetic instability at low temperatures. This instability manifested as avalanche-like flux penetration of magnetic field inside the superconductor [1]. It is so called flux jumps, appearing in the isothermal conditions, at any low perturbation. The thermomagnetic instability in high temperature superconductors (HTS) is not observed above 40 K due to a large heat capacity [2]. At high temperatures under the conditions of isothermal magnetization of a superconductor hollow cylinder or annulus (the ring with rectangular cross section) an inhomogeneous field is formed inside the body according to the critical state model, so dH/dr J С [1]. The superconducting current shields the interior until it fills the entire cross-section of the annulus. At the further magnetization the circulating current does not change its value maintaining the difference (H ex -H in )/(R ex -R in ) = 4J c between the

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