TWANG-PIC, a novel gyro-averaged one-dimensional particle-in-cell code for interpretation of gyrotron experiments

Abstract : A new gyrotron simulation code for simulating the beam-wave interaction using a monomode time-dependent self-consistent model is presented. The new code TWANG-PIC is derived from the trajectory-based code TWANG by describing the electron motion in a gyro-averaged one-dimensional Particle-In-Cell (PIC) approach. In comparison to common PIC-codes, it is distinguished by its computation speed, which makes its use in parameter scans and in experiment interpretation possible. A benchmark of the new code is presented as well as a comparative study between the two codes. This study shows that the inclusion of a time-dependence in the electron equations, as it is the case in the PIC-approach, is mandatory for simulating any kind of non-stationary oscillations in gyrotrons. Finally, the new code is compared with experimental results and some implications of the violated model assumptions in the TWANG code are disclosed for a gyrotron experiment in which non-stationary regimes have been observed and for a critical case that is of interest in high power gyrotron development.
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http://hal.in2p3.fr/in2p3-01184647
Contributor : Sophie Heurteau <>
Submitted on : Monday, August 17, 2015 - 11:08:12 AM
Last modification on : Thursday, January 11, 2018 - 6:12:40 AM

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F. Braunmueller, T. M. Tran, Q. Vuillemin, S. Alberti, J. Genoud, et al.. TWANG-PIC, a novel gyro-averaged one-dimensional particle-in-cell code for interpretation of gyrotron experiments. Physics of Plasmas, American Institute of Physics, 2015, 22 (6), pp.063115. ⟨10.1063/1.4923299⟩. ⟨in2p3-01184647⟩

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