SCIENTIA SINICA Informationis, Volume 47 , Issue 12 : 1741-1751(2017) https://doi.org/10.1360/N112016-00223

Terahertz broadband tunable pulse gyrotron

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  • ReceivedNov 23, 2016
  • AcceptedMar 2, 2017
  • PublishedAug 14, 2017


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感谢俄罗斯科学院应用物理所Michael I. Petelin教授以及Andrey V. Savilov教授给予的有益讨论.


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  • Figure 1

    (Color online) (a) Circuit profiles of pre-bunched circuit andopen-cavity circuit with axial magnetic field distribution, where line 1indicates the pre-bunched circuit profile, line 2 indicates the open-cavitycircuit profile, $f_~-$ indicates backward wave, and $~f_~+~$ indicatesforward wave; (b) axial interaction efficiencies $\eta~$ in different circuitswhen the gyrotron operates in backward interaction region at 330.1 GHz; (c)and (d) are axial field profile $f_{\rm~total}$, forward wave $f_+~$ and backwardwave $f_-$ in open-cavity circuit and pre-bunched circuit, respectively,when the gyrotron operates in backward interaction region at 330.1 GHz

  • Figure 2

    (Color online) Axial field profile $f_{\rm~total}$, forward wave $f_~+~$ andbackward wave $f_~-~$ in pre-bunched circuit when the TE$_{62~+~}$ modegyrotron operates at different magnetic fields (a) $B_0~=~12.0$ Tcorresponding to frequency $f$ = 328 GHz, (b) $B_0~=~12.4$ T corresponding tofrequency $f$ = 330 GHz, (c) $B_0~=~12.9$ T corresponding to frequency $f$ = 337GHz

  • Figure 3

    (Color online) Interaction efficiency and the continuous frequency tuningband of the TE$_{6,2~+~}$ mode gyrotron with electron beam voltage $V_b~=20$ kV and current $I_b~=~0.5$ A, assuming pitch factor $\alpha~=~{v_t~}/{v_z~}=~1.5$, guiding center $r_c~=~0.905$ mm,and guiding center spread ${\Delta~r_c~}/{r_c~}=~5%$ duringthe magnetic field tuning

  • Figure 4

    (Color online) Beam-wave coupling impedances of the potential oscillatingmodes

  • Figure 5

    (Color online) Measured half-sinusoidal distribution time-varyingmagnetic field strength generated by the pulse magnet, where the pulseduration is about 24 ms, and about 6 ms could be utilized for gyrotronoperating (blue region), while an extremely short duration could be used forconventional gyrotron operating (orange region)

  • Figure 6

    (Color online) Frequency spectrum of multimode simulation withtime-varying magnetic field and changing electron beam parameters. Pitchfactor varies between $\alpha~=~{v_t~}/~{v_z~}=~1.75~\sim~1.1$, velocityspread ranges between ${\Delta~v_z~}/~{v_z~}=~8%~\sim~5.5%~$, andconstant guiding center $r_c~=~0.905$ mm$_{~}$and guiding center spread${\Delta~r_c~}/~{r_c~}=~5%$ during the magnetic fieldtuning