T-8 tokamak device specifications and main parameters

The basic special features of the T-8 set-up vacuum chamber and magnetic system are presented. The T-8 set-up is a non-round cross section tokamak which is supposed to be used for studies of the plasma cord stability and equilibrium conditions, the limiting values of the plasma current and also of the possibilities of changing the plasma cord shape and automatic regulation of its position. The liner set-up discharge chamber has a mean radius R=28 cm, the maximum height h=40 cm, the maximum width 2a=12 cm. The liner is placed inside the thick-walled copper casing (Δ=1 cm). The magnetic system of the set-up consists of the iron yoke for production of the winding electric field, which induces the breake in the gas of the liner and the plasma current flow; coils producing the longitudinal (toroidal) magnetic field with a strength up to 12 T and the vertical magnetic field up to 0.5 T as well as coils which provide the compensation of the dispersed radial and vertical fields and regulation of the shape and position of the plasma cord. The magnetic coil power supply was provided by the high-voltage pulse system. The vacuum system of the set-up provides the in-liner vacuum of (2-5)x10-8 Torr and the working pressure of the hydrogen up to 10-3 Torr. The basic parameters characterizing the vacuum chamber of the set-up and the high-voltage system are presented. The different working pulse programming schemes are given. A brief discussion of various diagnostics used in experiments at T-8 set-up is given