MEASUREMENTS OF FAST-ION PARAMETERS IN THE GDL DEVICE BY MEANS OF AN AUXILIARY TARGET

Neutral-particle diagnostics is widely used to measure parameters of f ast ions in the GDL gasdynamic confinement system. In the present work , the diagnostic complex for measuring local ion energy and pitch-angl e distribution functions is described. A pulsed neutral beam with a hi gh equivalent-current density is injected into the plasma. The beam pr oduces a local target at which the charge exchange of fast ions occurs . Parameters of the flux of secondary charge-exchange atoms are measur ed with the scanning electrostatic analyzer. The equivalent current de nsity of the neutral flux in the produced target ranges up to 0.8 A/cm (2), which makes it possible to carry out measurements during the inje ction of heating neutral beams with energies 14-16 keV and total power up to 4 MW.