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Existing and new applications of micropellet injection (MPI) in magnetic fusion

Part of: Focus on Fusion Diagnostics of Dust in Plasmas

Published online by Cambridge University Press:  22 April 2016

Zhehui Wang ,
Robert Lunsford ,
Dennis K. Mansfield  and
Jacob H. Nichols
Zhehui Wang*
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Robert Lunsford
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08544, USA
Dennis K. Mansfield
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08544, USA
Jacob H. Nichols
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08544, USA
*
†Email address for correspondence: zwang@lanl.gov
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Abstract

The intense heat and energetic particle fluxes expected in ITER and future magnetic fusion reactors pose prohibitive problems to the design, selection and maintenance of the first wall and divertor. Micropellet injection (MPI) technologies can offer some innovative solutions to the material and extreme heat challenges. Basic physics of micropellet motion, ablation and interactions with high-temperature plasmas and energetic particles are presented first. We then discuss MPI technology options and applications. In addition to plasma diagnostic applications, controlled injection of micropellets of different sizes, velocities and injection frequencies will offer several possibilities: (1) better assessment of the core plasma cooling due to dust produced in situ; (2) better understanding of the plasma–material interaction physics near the wall; (3) new methods for plasma fuelling and impurity control; and (4) techniques for edge cooling with minimal impact on the plasma core. Dedicated small-scale laboratory experiments will complement major fusion experiments in development and applications of MPI.

Type
Research Article
Information
Journal of Plasma Physics , Volume 82 , Issue 2 , April 2016 , 615820202
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Copyright
© Cambridge University Press 2016 

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