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Agostinetti, P.

Paper Title Page
MOPD040 Secondary Particles in the Acceleration Stage of High Current, High Voltage Neutral Beam Injectors: the Case of the Injectors of the Thermonuclear Fusion Experiment ITER 771
 
  • G. Serianni, P. Agostinetti, V. Antoni, G. Chitarin, E. Gazza, N. Marconato, N. Pilan, P. Veltri
    Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova
  • M. Cavenago
    INFN/LNL, Legnaro (PD)
  • G. Fubiani
    GREPHE/LAPLACE, Toulouse
  
 

The ther­monu­cle­ar fu­sion ex­per­i­ment ITER, re­quires 33 MW of aux­il­iary heat­ing power from two Neu­tral Beam In­jec­tors (NBI), each of them pro­vid­ing 40 A of neg­a­tive deu­teri­um ions. The EU ac­tiv­i­ties ori­ent­ed to the re­al­i­sa­tion of the elec­tro­stat­ic ac­cel­er­a­tor com­prise the con­struc­tion in Pado­va of SPI­DER, a fa­cil­i­ty de­vot­ed to the op­ti­mi­sa­tion of the beam source. SPI­DER pa­ram­e­ters are: 100 keV ac­cel­er­a­tion, 40/60 A (deu­teri­um/hy­dro­gen) cur­rent. For the op­ti­mised SPI­DER ac­cel­er­a­tor the pre­sent con­tri­bu­tion pro­vides a char­ac­ter­i­sa­tion of sec­ondary par­ti­cles, which in­clude elec­trons pro­duced by im­pact of ions on grid sur­faces, stripped from neg­a­tive ions in­side the ac­cel­er­a­tor, and pro­duced by ion­i­sa­tion of the back­ground gas, and the cor­re­spond­ing pos­i­tive ions. Cur­rents and heat de­posit­ed on the var­i­ous grids and spa­tial dis­tri­bu­tion by sec­on­daries will be de­scribed. It is found that most of the heat loads on the ac­cel­er­a­tor grids is due to elec­trons; more­over the fea­tures of sec­on­daries ex­it­ing the ac­cel­er­a­tor and back-stream­ing to­wards the source will be pre­sent­ed. The re­sults will be com­pared with old in­ves­ti­ga­tions con­cern­ing the NBI 1 MeV ac­cel­er­a­tor.