Plasma and Fusion Research

Volume 18, 2405053 (2023)

Regular Articles

Examination of Efficiency Dependence on Deceleration Voltage in a Traveling Wave Direct Energy Converter Simulator
Hiromasa TAKENO, Kazuhiro SHIBATA, Satoshi NAKAMOTO, Takeru FURUKAWA and Yousuke NAKASHIMA1)
Kobe University, Kobe 657-8501, Japan
1)
University of Tsukuba, Tsukuba 305-8577, Japan
(Received 5 January 2023 / Accepted 8 May 2023 / Published 22 June 2023)

Abstract

As for traveling wave direct energy converter (TWDEC), which was expected to be an efficient energy recovery device for fast protons created in D-3He fusion, efficiency dependence on deceleration voltage was examined. A decelerator was designed based on the theory of constant deceleration scheme, in which ions were trapped in a decelerated traveling wave potential, and a simulation experiment was performed. Over a certain deceleration voltage, deceleration efficiency degraded when deceleration voltage increased, which was contradictive to the theory. Numerical orbit calculation revealed that the trapped ion exhibited the expected bouncing motion for a very short period and exited the decelerator just after acceleration phase and this caused the degradation of the deceleration effect. In the design of the decelerator, bouncing motion as well as trapping should be considered.

Keywords

advanced fusion, direct energy conversion, TWDEC, decelerator, constant deceleration

DOI: 10.1585/pfr.18.2405053

Full Text

PDF format (585Kbytes) PDF Download

References

  • [1] H. Momota, LA-11808-C, Los Alamos Natl. Lab., 8 (1990).
  • [2] H. Momota et al., Proc. 7th Int. Conf. on Emerging Nucl. Energy Systems, 16 (1993).
  • [3] H. Katayama and K. Sato, J. Plasma Fusion Res. 77, 698 (2001) (in Japanese).
  • [4] M.C. Spraker et al., J. Fusion Energy 31, 357 (2012).
  • [5] N. Rostoker et al., J. Fusion Energy 22, 83 (2003).
  • [6] H. Takeno et al., Jap. J. Appl. Phys. 39, 5287 (2000).
  • [7] Y. Togo et al., Plasma Fusion Res. 10, 3405013 (2015).
  • [8] K. Shibata et al., Plasma Fusion Res. 14, 3405078 (2019).
  • [9] H. Takeno et al., Plasma Fusion Res. 14, 2405014 (2019).