Interaction of impurity (Li, Be, B and C) and hydrogen isotope pellet injection with reactor-relevant plasmas

Baiquan Deng, J. P. Allain, Lilin Peng, Xiaoyu Wang, Zhi Chen, Jiancheng Yan

Research output: Contribution to journalArticle

Abstract

Based on the two-dimensional kinetic ablation theory of the hydrogen pellet ablation developed by Kuteev [B.V. Kuteev, Nuclear Fusion, 35 (1995) 431], an algorithm of erosion speed and ablation rate calculations for Li, Be, and B impurity pellets in reactor-relevant plasma has been derived. Results show compatibilities of lithium pellet injection used in α-particle diagnostics are positive in comparison with other solid impurity pellets (e.g. Be, B and C). Using the 2-D Kuteev lentil model, including kinetic effects, we find that currently existing pellet injection techniques will not meet core-fueling requirements for ITER-FEAT. A pressure as high as 254 MPa must be applied to a pellet accelerator with a 200 cm-long single-stage pneumatic gun, in order to accelerate a pellet with a radius rp0 = 0.5 cm to a velocity of vp0, 24 × 105 cm/s penetrating 100 cm into the ITER plasma core. Comparisons of pellet velocity- and radius-dependent penetration depth between the Neutral Gas Shielding and the Kuteev's models are made. However, we find that the isotopic effects can lead to a 33% lower pellet speed for solid DT, compared to an identical H2 pellet penetrating the same length in ITER-FEAT plasma, and our calculations show that HFS injection will much improve core fueling efficiency.

Original languageEnglish (US)
Pages (from-to)2615-2622
Number of pages8
JournalPlasma Science and Technology
Volume7
Issue number1
DOIs
StatePublished - Feb 1 2005

Keywords

  • Core fueling
  • HFS injection
  • ITER-FEAT
  • Isotopic effects
  • Pellet ablation

ASJC Scopus subject areas

  • Condensed Matter Physics

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