Negative ion sources [1-3] are a fundamental component of advanced Neutral Beam Injectors (NBI) [4-7], which are the major plasma heating system for the International Tokamak Experimental Reactor (ITER) project, considering the need of long pulses operations, to sustain plasma toroidal current (so called 'current drive'). Therefore in the perspective of the efficiency of DEMO reactor, NBI need to be improved and strongly optimized [8]. A relatively compact radiofrequency (rf) ion source, named NIO1 (Negative Ion Optimization phase 1) [9-11], developed by INFN and Consorzio RFX, with 9 beam apertures for a total H- current of 130 mA at -60kV extraction voltage, was installed at RFX, Padua, to provide a test bench for source optimizations in the framework of the accompanying activities in support to the ITER NBI test facility. These activities enter also in the framework of INFN experiments INFN-E (for Energy) and Beam4Fusion (Group 5), which also include development of neutron diagnostic for NBI injector prototypes as SPIDER and MITICA (under construction at Consorzio RFX [6, 7]) and for tokamaks. NIO1 milestones and first operation (July 2014) reported elsewhere [12-15] are here summarized. Among theoretical researches related to negative ion sources, this year particular attention was dedicated to beam deflection cancellation [16,17] and critical revision of particle in cell simulation tools and beam optics [18-21].
First Operation of the Multi-Aperture Negative Ion Source NIO1 and Related Activities of the Beam4Fusion Experiment
G Serianni;V Antoni;R Pasqualotto;M Barbisan;V Cervaro;P Agostinetti;F Degli Agostini;M Maniero;M Recchia;
2015
Abstract
Negative ion sources [1-3] are a fundamental component of advanced Neutral Beam Injectors (NBI) [4-7], which are the major plasma heating system for the International Tokamak Experimental Reactor (ITER) project, considering the need of long pulses operations, to sustain plasma toroidal current (so called 'current drive'). Therefore in the perspective of the efficiency of DEMO reactor, NBI need to be improved and strongly optimized [8]. A relatively compact radiofrequency (rf) ion source, named NIO1 (Negative Ion Optimization phase 1) [9-11], developed by INFN and Consorzio RFX, with 9 beam apertures for a total H- current of 130 mA at -60kV extraction voltage, was installed at RFX, Padua, to provide a test bench for source optimizations in the framework of the accompanying activities in support to the ITER NBI test facility. These activities enter also in the framework of INFN experiments INFN-E (for Energy) and Beam4Fusion (Group 5), which also include development of neutron diagnostic for NBI injector prototypes as SPIDER and MITICA (under construction at Consorzio RFX [6, 7]) and for tokamaks. NIO1 milestones and first operation (July 2014) reported elsewhere [12-15] are here summarized. Among theoretical researches related to negative ion sources, this year particular attention was dedicated to beam deflection cancellation [16,17] and critical revision of particle in cell simulation tools and beam optics [18-21].I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
