Development of an energy analyzer as diagnostic of beam- generated plasma in negative ion beam systems

E. Sartori, G. Carozzi, P. Veltri, M. Spolaore, R. Cavazzana, V. Antoni, G. Serianni

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2 Citations (Scopus)

Abstract

The measurement of the plasma potential and the energy spectrum of secondary particles in the drift region of a negative ion beam offers an insight into beam-induced plasma formation and beam transport in low pressure gasses. Plasma formation in negative-ion beam systems, and the characteristics of such a plasma are of interest especially for space charge compensation, plasma formation in neutralizers, and the development of improved schemes of beam-induced plasma neutralisers for future fusion devices. All these aspects have direct implications in the ITER Heating Neutral Beam and the operation of the prototypes, SPIDER and MITICA, and also have important role in the conceptual studies for NBI systems of DEMO, while at present experimental data are lacking. In this paper we present the design and development of an ion energy analyzer to measure the beam plasma formation and space charge compensation in negative ion beams. The diagnostic is a retarding field energy analyzer (RFEA), and will measure the transverse energy spectra of plasma molecular ions. The calculations that supported the design are reported, and a method to interpret the measurements in negative ion beam systems is also proposed. Finally, the experimental results of the first test in a magnetron plasma are presented.
Original languageEnglish
DOIs
Publication statusPublished - 9 Aug 2017
Externally publishedYes
Event5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 - Oxford, United Kingdom
Duration: 9 Aug 2017 → …

Conference

Conference5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
CountryUnited Kingdom
CityOxford
Period9/8/17 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Sartori, E., Carozzi, G., Veltri, P., Spolaore, M., Cavazzana, R., Antoni, V., & Serianni, G. (2017). Development of an energy analyzer as diagnostic of beam- generated plasma in negative ion beam systems. Paper presented at 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016, Oxford, United Kingdom. https://doi.org/10.1063/1.4995792