Generalized nonlinear harmonic gyrotron theory

Danly, B.G.; Temkin, R.J.

doi:10.1063/1.865446

Cited by 230 publications

(64 citation statements)

References 28 publications

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“…We have previously studied transverse coupling in a test structure at 17 GHz and obtained excellent results coupling into and out of a PBG structure [20]. For the operating parameters chosen in the experiment and the ratio of the diffractive Q to the ohmic Q, the experimentally observed efficiency agrees well with the predictions from a nonlinear theory [14]- [16].…”

Section: Figsupporting

confidence: 75%

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Photonic-Band-Gap Resonator Gyrotron

et al. 2001

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Section: Figsupporting

confidence: 75%

“…The beam parameters, the cavity dimensions and an optimum detuning can be determined from the procedure outlined in [14]- [16] to optimize the interaction efficiency. The choice of the operating mode is dictated by the cavity ohmic heat capacity and the window for stable single-mode excitation at a high interaction efficiency.…”

Section: Figmentioning

confidence: 99%

Photonic-Band-Gap Resonator Gyrotron

et al. 2001

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“…The electron beam radius, r b , is usually chosen to coincide with the first maximum of J m6n to achieve the strongest possible interaction. Notice that other definitions of the normalized current exist 13 for studies based on the cold cavity approximation using a fixed field profile where the normalized current depends linearly on the cold-cavity total quality factor (diffraction þ ohmic losses). The normalized interaction length is given by…”

Section: -7 Alberti Et Almentioning

confidence: 99%

“…This quantity is well defined for a fixed profile such as a gaussian profile. 13 For the cold cavity profile TE 7;2;1 shown in Fig. 6, we define L ef f as the FWHM of the longitudinal field-amplitude profile.…”

Section: -7 Alberti Et Almentioning

confidence: 99%

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator

et al. 2012

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Basic wave-particle interaction dynamics from linear to chaotic regimes is experimentally studied on a frequency tunable gyrotron generating THz radiation in continuous mode (200 W) at 263 GHz which will be used for dynamic nuclear polarization nuclear magnetic resonance spectroscopy applications. In the studied system, the nonlinear dynamics associated to the waveparticle interaction is dominated by longitudinal mode competition of a given transverse TE m;p cavity-mode. This study covers a wide range of control parameter from gyro-traveling wave tube (gyro-TWT) to gyro-backward wave oscillator (gyro-BWO) like interactions for which extensive theoretical studies have been performed in the past on a simplified system. Besides the common route to chaos characterized by period doubling, other routes have been identified among which some are characterized by line-width frequency-broadening on the side-bands. The complex nonlinear dynamics is in good agreement with the theory and the experimental results are discussed on the basis of the prediction obtained with the nonlinear time-dependent selfconsistent codes TWANG and EURIDICE both based on a slow-time scale formulation of the self-consistent equations governing the wave-particle dynamics. V C 2012 American Institute of Physics. [http://dx

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“…The mode selection depends on several parameters, namely, the voltage depression, the limiting current, the ohmic wall loading, etc., described in detail elsewhere [5,6]. On the basis of the mode selection parameters and the start up scenario in the interaction region [23,24], the high order TE 22,6 mode has been selected as the operating mode and the electron beam has been launched at the first radial maxima for the fundamental beammode operation. The TE 22,6 mode exhibits high coupling with the gyrating electron beam.…”

Section: Preliminary Designmentioning

confidence: 99%

Numerical Simulation of Magnetron Injection Gun for 1mw 120 GHZ Gyrotron

Singh¹,

Kumar²,

Kumar³

et al. 2010

PIER Letters

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Abstract-A 40 A triode-type magnetron injection gun for a 1 MW, 120 GHz gyrotron has been designed. The preliminary design has been obtained by using some trade-off equations. Computer simulation has been performed by using the commercially available code EGUN and the in-house developed code MIGANS. The operating voltages of the modulating anode and the accelerating anode are 60 kV and 80 kV, respectively. The electron beam with a low transverse velocity spread (δβ ⊥ max = 3.3%) and velocity ratio, α = 1.38 at beam current = 40 A is obtained. The simulated results of the MIG obtained with the EGUN code have been validated with another trajectory code TRAK. The results on the design output parameters obtained by these two codes were found to be in close agreement. The sensitivity study has been carried out by changing the different gun parameters to decide the fabrication tolerance.

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Generalized nonlinear harmonic gyrotron theory

Abstract: The nonlinear efficiency for a gyrotron oscillator operating at harmonics of the cyclotron frequency has been calculated and is presented as a function of generalized parameters for the second through fifth harmonics.

Cited by 230 publications

References 28 publications

Photonic-Band-Gap Resonator Gyrotron

Photonic-Band-Gap Resonator Gyrotron

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator

Numerical Simulation of Magnetron Injection Gun for 1mw 120 GHZ Gyrotron

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