Electrostatic steering and beamlet aiming in large neutral beam injectors

P. Veltri, M. Cavenago, G. Chitarin, D. Marcuzzi, E. Sartori, G. Serianni, P. Sonato

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

Neutral beam injection is themainmethod for plasma heating inmagnetic confinement fusion devices. In high energy injector (E>100 keV/amu), neutrals are obtained with reasonable efficiency by conversion of negative ions (H-or D-) via electron detachment reactions. In the case of ITER injectors, which shall operate at 1MeV, a total ion current of ∼ 40 A is required to satisfy the heating power demand. Gridded electrodes are therefore used in the accelerator, so that 1280 negative ion beamlets are accelerated together. A carefully designed aiming system is required to control the beamlet trajectories, and to deliver their power on a focal point located severalmeters away from the beam source. In nowadays injectors, the aiming is typically obtained by aperture offset technique or by grid shaping. This paper discuss an alternative concept of beamlets aiming, based on an electrostatic "steerer" to be placed at the end of the accelerator. A feasibility study of this component is also presented, and itsmain advantages and drawbacks with respect to othermethods are discussed.
Original languageEnglish
DOIs
Publication statusPublished - 8 Apr 2015
Externally publishedYes
Event4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 - Garching, Germany
Duration: 8 Apr 2015 → …

Conference

Conference4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
CountryGermany
CityGarching
Period8/4/15 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Veltri, P., Cavenago, M., Chitarin, G., Marcuzzi, D., Sartori, E., Serianni, G., & Sonato, P. (2015). Electrostatic steering and beamlet aiming in large neutral beam injectors. Paper presented at 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014, Garching, Germany. https://doi.org/10.1063/1.4916462