DEVICE FOR MEASUREMENT OF DISTRIBUTION OF RAPID NEUTRONS FLUXES AND GAMMA RADIATION ALONG TO CROSS-SECTION OF PLASMA CORD Russian patent published in 1995 - IPC

FIELD: plasma physics. SUBSTANCE: device has cavity with variable cross-section size along longitudinal axis of the case of the device. The cavity has shape of two isosceles similar triangles with bases disposed at edges of the case of the device. The triangles have common vertex which belongs to longitudinal axis of symmetry is perpendicular to the axis and has shape of rectangles. Size of the larger side of the rectangular at the side of edge at the side of hole of the branch pipe is determined by relation 1 = 2ah/(h+h_F+δ_w+r_w), where 2a is diameter of plasma cord detected; h is height of the triangle determined by retarding capability of material chosen from table given in the description of the invention; h_F is height of flange of vacuum chamber of thermonuclear plant; δ_W and r_W are thickness and internal radius correspondingly of wall of vacuum chamber, size of the larger side of the rectangular is no less than dn at opposite side l′, where d is diameter of detector, n is number of the detectors being sufficient for achieving curve of distribution of rapid neutron streams and gamma radiation along plasma cord cross-section. Moreover, to indicate neutrons with D-D-reaction threshold energy of the detectors is equal to 2 MeV and for D-T-reaction neutrons it is equal to 13 Mev. EFFECT: improved precision of measurement. 2 cl, 4 dwg