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Special Topics

EPJ D Colloquium - Overview of photo-neutralization techniques for negative ion-based neutral beam injectors in future fusion reactors

The need for safe, carbon-free and abundant sources of energy is becoming more and more pressing. While still under development, nuclear fusion can play a key role in a medium term, decarbonized energy scenario. However, in order for fusion to be commercially competitive, many sub-systems constituting the current experimental reactors need to be optimized in terms of their efficiency: in particular, DEMO and future fusion energy plants will require a substantial increase in the energy performances of the plasma heating systems.

In a new Colloquium paper published in EPJD, authors from Consorzio RFX, Padova and from CNR, Consiglio Nazionale delle Ricerche, Padova, consider the neutral beam injector system, a device whose aim is to warm up the plasma particles through collisions with neutral particles. One of the most challenging aspects of this system is to realize a high efficiency neutralizer of negative ions accelerated at around 1 MV. In this paper, the authors address the most promising technique for the realization of such a high efficiency neutralizer, namely photo-neutralization. The aim of the paper is to present an overview of the state-of-the-art in photo-neutralization configurations and compare their relative merits. Furthermore, possible future developments are investigated, such as the implementation of an ad-hoc free electron laser to help attain the required system performances.

Managing Editors
Anne Ruimy and Vijala Kiruvanayagam (EDP Sciences) and Sabine Lehr (Springer-Verlag)
Dear Isabelle, dear Ms. Lehr,
We want to express our sincere thanks to you for your outstanding work perfectly in time.

Kerstin Eckert, TU Dresden, Germany
on behalf of the other Editors EPJ Special Topics 220, 2013

ISSN: 1951-6355 (Print Edition)
ISSN: 1951-6401 (Electronic Edition)

© EDP Sciences and Springer-Verlag

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