Non-ideal operating conditions of the ion source prototype for the ITER neutral beam injector due to thermal deformation of the support structure

E. Sartori, M. Pavei, D. Marcuzzi, P. Zaccaria

Research output: Contribution to journalArticle


The beam formation and acceleration of the ITER neutral beam injector will be studied in the full-scale ion source, Source for Production of Ions of Deuterium Extracted from a RF plasma (SPIDER). It will be able to sustain 40 A deuterium ion beam during 1-h pulses. The operating conditions of its multi-aperture electrodes will diverge from ideality, as a consequence of inhomogeneous heating and thermally induced deformations in the support structure of the extraction and acceleration grids, which operate at different temperatures. Meeting the requirements on the aperture alignment and distance between the grids with such a large number of apertures (1280) and the huge support structures constitute a challenge. Examination of the structure thermal deformation in transient and steady conditions has been carried out, evaluating their effect on the beam performance: the paper describes the analyses and the solutions proposed to mitigate detrimental effects.
Original languageEnglish
Article number02B313
Pages (from-to)-
JournalReview of Scientific Instruments
Issue number2
Publication statusPublished - 1 Feb 2014
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

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