Answers are grounded in this paper and cite their sources.
Trivelpiece-Gould modes (TG modes) have been observed with frequencies up to the background plasma frequency in a plasma-filled X-band backward wave oscillator. The TG mode emission was broadband with observed frequencies ranging from 2.6 GHz, the lower limit of our frequency diagnostic, to fₚ, the plasma frequency. Mode competition between the TG modes and the X-band TM₀₁ mode prevailed when the background plasma density was below 6×{}10¹¹ cm^-3 (fₚ{~}7 GHz). At a critical background plasma density of ncr{~}8×{}10¹¹ cm^-3 (fₚ{~}8 GHz) a sudden power enhancement appeared simultaneously in both X band and the TG modes. Power enhancements in S and J bands were up to 8 and 3 dB, respectively, with the X band enhanced up to a factor of 6.
No takes yet. Share an insight, caveat, or question.
Zhai et al. (1992) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: