Events in Physics
Bernard Reman (Toulouse): Modelling of the beam-driven plasma neutraliser
In the International Thermonuclear Experimental Reactor (ITER), the two neutral-beam in-
jectors (NBI) are designed to deliver a joint power of 33MW by injecting deuterium at 1 MeV.
The neutralisation of positively charged deuterium is inefficient at such energies which requires
to generate, to accelerate and to neutralise negatively charged deuterium ions. The magnetised plasma column source is a serious candidate for the generation of negative ions and different
schemes of neutralisation have been proposed including gas, plasma and photo-neutralisation
[1]. We focus on the plasma neutraliser [2] which appears to be the ideal trade-off between gas
neutralisation, limited to a neutralisation yield of ∼ 50%, and photoneutralisation which would
increase this beyond 90% although not ready technologically. Recent modelling work suggests
that the plasma could be sustained by the negative ion beam itself, alleviating the operation
of an external plasma source [3, 4] and it could reach a neutralisation efficiency ∼ 80% with
ne > 5 × 10^18 m−3 . The stripped electrons and the electrons created by beam ionisation of the
background gas must be magnetically confined. We conduct particle test calculations in a mag-
netic bottle, adding ionisation, to assess the electrons residence time before studying the plasma
neutraliser by means of fully self-consistent particle-in-cell (PIC) simulations [5]. In a second time, we address the stability of these linear plasma devices in the plane perpendicular to the magnetic field as it affects plasma transport and eventually their performance.
[1] J. Pamela, Plasma Phys. Control. Fusion 37 A325 (1995)
[2] K. H. Berkner et al., 2nd Int. Symp Prod. and Neutr. of Neg. Ions and Beams, Upton, NY (1980)
[3] E. Surrey and A.J.T. Holmes, AIP Conf. Proc. 1515 532 (2013)
[4] I. Turner and A.J.T. Holmes, Fusion Eng. Des. 149 111327 (2019)
[5] G. Fubiani et al., New J. Phys. 19 015002 (2017)
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Due to the implementation of a new UKRI funding system (TFS) there will be a fixed quarterly deadlines for some grants which would previously have been on open calls, this is to allow necessary system amendments and updates.
The first deadline after implementation will be 28th September 2023 and applies to those calls listed below:
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