The ITER tokamak requires two heating Neutral Beam Injectors (NBIs), based on neutralisation of 40 A, 1 MeV negative hydrogen ions with one hour pulse length. As these simultaneous parameters were never experimentally achieved, a worldwide effort aims at addressing all the NBI issues, which are related to generation and extraction of negative ions, attainment of optics specifications (beam divergence and aiming), high-voltage holding, transport and neutralisation of the charged beam. This communication will report on the main issues and will describe the current status of the understanding, which is applied to the prototype NBI for ITER under construction in Padova.
High-power Negative-ion beams: main physics issues
Serianni G;Agostinetti P;Antoni V;Pasqualotto R;
2016
Abstract
The ITER tokamak requires two heating Neutral Beam Injectors (NBIs), based on neutralisation of 40 A, 1 MeV negative hydrogen ions with one hour pulse length. As these simultaneous parameters were never experimentally achieved, a worldwide effort aims at addressing all the NBI issues, which are related to generation and extraction of negative ions, attainment of optics specifications (beam divergence and aiming), high-voltage holding, transport and neutralisation of the charged beam. This communication will report on the main issues and will describe the current status of the understanding, which is applied to the prototype NBI for ITER under construction in Padova.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
