Analytic theory of a tapered gyrotron resonator

Temkin, Richard J.

doi:10.1007/bf01007268

Cited by 39 publications

(5 citation statements)

References 9 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[8][9][10][11][12][13][14][15][16][17][18][19][20] These studies often address issues a) Electronic mail: krchu@yahoo.com.tw related to practical devices, such as field-profile optimization for efficient interaction, 10,14,17 synthesis of a desired field profile, 15 and mode separation for stable operation. 10,14 Although numerical solutions can be readily obtained, such cavities also present an interesting case for analytical investigations. In Ref.…”

Section: B Review Of Early Workmentioning

confidence: 99%

An analytical study on the diffraction quality factor of open cavities

2014

View full text Add to dashboard Cite

Open cavities are often employed as interaction structures in a new generation of coherent millimeter, sub-millimeter, and terahertz (THz) radiation sources called the gyrotron. One of the open ends of the cavity is intended for rapid extraction of the radiation generated by a powerful electron beam. Up to the sub-THz regime, the diffraction loss from this open end dominates over the Ohmic losses on the walls, which results in a much lower diffraction quality factor (Qd) than the Ohmic quality factor (Qohm). Early analytical studies have led to various expressions for Qd and shed much light on its properties. In this study, we begin with a review of these studies, and then proceed with the derivation of an analytical expression for Qd accurate to high order. Its validity is verified with numerical solutions for a step-tunable cavity commonly employed for the development of sub-THz and THz gyrotrons. On the basis of the results, a simplified equation is obtained which explicitly expresses the scaling laws of Qd with respect to mode indices and cavity dimensions.

show abstract

Section: B Review Of Early Workmentioning

confidence: 99%

An analytical study on the diffraction quality factor of open cavities

2014

View full text Add to dashboard Cite

show abstract

“…The diffractive quality factor is related to the axial index by the law. [25] Table 1. Frequencies and diffractive quality factors for the TE −3,4,q modes.…”

Section: Mode Selection and Cold Axial Modes Analysismentioning

confidence: 99%

A 0.33-THz second-harmonic frequency-tunable gyrotron

et al. 2016

Chinese Phys. B

View full text Add to dashboard Cite

Dynamics of the axial mode transition process in a 0.33-THz second-harmonic gyrotron is investigated to reveal the physical mechanism of realizing broadband frequency tuning in an open cavity circuit. A new interaction mechanism about propagating waves, featured by wave competition and wave cooperation, is presented and provides a new insight into the beam-wave interaction. The two different features revealed in the two different operation regions of low-order axial modes (LOAMs) and high-order axial modes (HOAMs) respectively determine the characteristic of the overall performance of the device essentially. The device performance is obtained by the simulation based on the time-domain nonlinear theory and shows that using a 12-kV/150-mA electron beam and TE−3,4 mode, the second harmonic gyrotron can generate terahertz radiations with frequency-tuning ranges of about 0.85 GHz and 0.60 GHz via magnetic field and beam voltage tuning, respectively. Additionally, some non-stationary phenomena in the mode startup process are also analyzed. The investigation in this paper presents guidance for future developing high-performance frequency-tunable gyrotrons toward terahertz applications.

show abstract

“…In Sect. 3, we analyze the diffractive quality factor Q D in a relatively general way following the treatment done in [9], [18][19][20]. In this section, it is shown that the standard formula for the minimum diffractive Q widely used by many authors for evaluating the gyrotron operation gives a wrong scaling of the diffractive Q with the cavity length to the wavelength ratio: Q D ∝(L/λ) 2 .…”

mentioning

confidence: 99%

Field Formation in the Interaction Space of Gyrotrons

Nusinovich

Dumbrājs

2015

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

For gyrotron applications in plasma installations, one of the most important factors is the gyrotron efficiency. To maximize the interaction efficiency, it is necessary not only to optimize such operating parameters as the magnetic field, beam voltage, and current but also the axial profile of the electromagnetic (EM) field in the interaction space. The present paper describes a study of the effect of the profile of an irregular waveguide serving as a resonator on the axial structure of the EM field. Specific attention is paid to the profile of the uptaper connecting the regular part of a resonator to the output waveguide. Conditions of applicability of the nonuniform string equation, which is widely used in gyrotron designs for finding the axial structure of the EM field, are discussed. Also discussed are the occurrence of reflections from a smooth uptaper and the analogy between the nonuniform string equation and the stationary Schrodinger equation.

show abstract

Analytic theory of a tapered gyrotron resonator

Cited by 39 publications

References 9 publications

An analytical study on the diffraction quality factor of open cavities

An analytical study on the diffraction quality factor of open cavities

A 0.33-THz second-harmonic frequency-tunable gyrotron

Field Formation in the Interaction Space of Gyrotrons

Contact Info

Product

Resources

About