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Yaogen Ding

Bio: Yaogen Ding is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Klystron & Beam (structure). The author has an hindex of 9, co-authored 89 publications receiving 361 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a new type of S-band multibeam klystron has been developed at the Institute of Electronics, Chinese Academy of Sciences, China, which has a peak power of 120-160 kW, a bandwidth of 10%, a gain of 41 dB, a beam voltage of 16 kV, a weight of 45 kg and a length of 700 mm.
Abstract: A new type of S-band multibeam klystron has been developed at the Institute of Electronics, Chinese Academy of Sciences, China. The main methods for obtaining wide bandwidth include a multibeam electron gun with 18 beams, a periodic permanent magnet focusing system, a wide-band bunching system and filter-load double-gap coupling-cavity output circuit. The design methods and experimental results are given in this paper. The test results show that this device has a peak power of 120-160 kW, a bandwidth of 10%, a gain of 41 dB, a beam voltage of 16 kV, a weight of 45 kg and a length of 700 mm.

38 citations

Journal ArticleDOI
Yong Han1, Yanwen Liu1, Yaogen Ding1, Pu-Kun Liu1, Chun-hua Lu1 
TL;DR: In this paper, an analytical method using ANSYS has been developed for studying the heat-dissipation capability of a helix traveling-wave-tube slow-wave structure (SWS).
Abstract: A novel and effective analytical method using ANSYS has been developed for studying the heat-dissipation capability of a helix traveling-wave-tube slow-wave structure (SWS). This method, which is based on calibrating theoretical calculations with experimental data, is able to precisely predict the SWS heat dissipation, thereby reducing material costs and saving time. The consistency and feasibility of this method have been verified by experimental tests on SWSs using copper-plated helices and both BeO and BN support rods.

32 citations

Journal ArticleDOI
TL;DR: In this paper, a new experimental evaluation method is presented for evaluating and comparing the heat dissipation capability of the slow-wave structures (SWSs) of helix traveling-wave tube (TWT).
Abstract: A new experimental evaluation method is presented for evaluating and comparing the heat dissipation capability of the slow-wave structures (SWSs) of helix traveling-wave tube (TWT). The practicality and simplicity of the evaluation method have been validated through experimental tests in some components with different assembling and processing methods, such as the cold stuffing, the heat shrink, the hot insertion, the molybdenum wrapping methods, and so on. Experimental results demonstrate that our evaluation method can be used effectively and conveniently to estimate and compare the thermal dissipation capability of the SWSs of the helix TWT

31 citations

Journal ArticleDOI
TL;DR: In this article, a sheet beam electron optics prototype tube using the closed periodically cusped magnetic focusing was constructed and hot tested in the full voltage at the Institute of Electronics, Chinese Academy of Sciences.
Abstract: This paper reports the research work of an X-band sheet beam klystron with the aim of principle verification, which is fulfilled at the Institute of Electronics, Chinese Academy of Sciences. This paper includes two phases. The first phase is planned to build the sheet beam electron optics prototype tube using the closed periodically cusped magnetic focusing. The measured data shows that the rectangular beam with the cross section of 50 mm × 4 mm can propagate through ~ 300 mm from the cathode surface to the collector with the transmission of 92.4% at the voltage of 110 kV. This foregoing work successfully solves the beam formation and transportation and becomes the basis for developing the sheet beam klystron. In the second phase, the high-frequency interaction structure is designed and cold tested. The X-band sheet beam klystron is constructed and hot tested in the full voltage. The amplification characteristic can be observed near the voltage of 125 kV. For the drive power of 0.71 kW and the working frequency of 11.69 GHz, the output power of 2.8 MW is achieved with the 3 dB bandwidth of 30 MHz, and, correspondingly, the gain and the efficiency are 35.96 dB and 32.52%, respectively. At the same time, the beam transmission is 73.3%. An over 93% transmission is realized at the voltage of 135 kV, whereas the oscillation occurs in the tube. This research exhibits that the sheet beam klystron is a promising device for the high-power applications, whereas seeking the measures to overcome the oscillation is still an arduous task in the future.

26 citations

Journal ArticleDOI
TL;DR: In this article, the design considerations for obtaining high power and wide instantaneous bandwidths and test results for these MBKs are presented, and the main technical problems, including a power sag in the band, high voltage breakdown, and non-operating mode oscillation, are also discussed.
Abstract: Several types of C-band broadband multibeam klystrons (MBKs) are under development at the Institute of Electronics, Chinese Academy of Sciences. These MBKs operate at various C-band frequencies and have peak powers of 30-200 kW, average powers of 2-10 kW, and bandwidths of 4%-7%. The design considerations for obtaining high power and wide instantaneous bandwidths and test results for these MBKs are presented in this paper. The main technical problems, including a power sag in the band, high voltage breakdown, and non-operating mode oscillation, are also discussed. Further research work for improving the performance of these MBKs is described

25 citations


Cited by
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01 Aug 1986
TL;DR: In this article, a comprehensive theory of the cyclotron resonance maser (CRM) interaction in a circular waveguide is presented, and the conditions for maximum temporal and spatial growth rates are shown.
Abstract: This paper presents a comprehensive theory of the cyclotron resonance maser (CRM) interaction in a circular waveguide. The kinetic theory is used to derive the dispersion relationships for both TE and TM modes. The TE mode case has been investigated by several authors, but there has been comparatively little work on the TM mode case. However, the TM mode interaction competes effectively with the TE mode interaction at relativistic electron energies. The conditions for maximum temporal and spatial growth rates are shown. The TM mode growth rates are found to vanish when the RF wave group velocity equals the beam axial velocity (‘grazing incidence’). The single particle theory is used to derive a compact set of self-consistent non-linear equations for the TE and TM mode interactions. These equations are particularly appropriate for the cyclotron auto-resonance maser (CARM) regime but applicability extends to other regimes as well. The conditions for optimum efficiency are investigated for oscillator and amp...

186 citations

Journal ArticleDOI
TL;DR: In this article, the authors theoretically examined the transport of intense sheet electron beams in a uniform solenoidal magnetic field in high-power vacuum electronic devices and showed that a solenoidally transported electron beam is not susceptible to voltage cutoff as in a periodic magnetic focusing system.
Abstract: In this paper, the transport of intense sheet electron beams in a uniform solenoidal magnetic field in high-power vacuum electronic devices is theoretically examined with the 3-D beam optics code MICHELLE. It is shown that a solenoidal magnetic field can be an effective transport mechanism for sheet electron beams, provided the beam tunnel is matched to the beam shape, and vice versa. The advantage of solenoidal magnetic field transport relative to periodic magnetic transport resides in the feasibility of transporting higher current density beams due to the higher average field strength achievable in practice and the lower susceptibility to field errors from mechanical misalignments. In addition, a solenoidally transported electron beam is not susceptible to voltage cutoff as in a periodic magnetic focusing system; hence, device efficiency is potentially higher.

99 citations

Journal ArticleDOI
TL;DR: In this paper, a W-band sheet beam klystron is developed as a portable coherent radiation source for active denial system application, which employs eight stagger-tuned cavities (multigap structure) and a 12:1-aspect-ratio sheet electron beam (74 kV and 3.6 A) to produce 50kW peak power (2.5 kW average) and 40dB gain with 200-MHz instantaneous bandwidth.
Abstract: A W-band sheet beam klystron is being developed as a portable coherent radiation source for active denial system application. The interaction circuit design employs eight stagger-tuned cavities (multigap structure) and a 12:1-aspect-ratio sheet electron beam (74 kV and 3.6 A) to produce 50-kW peak power (2.5 kW average) and 40-dB gain with 200-MHz instantaneous bandwidth. The output cavity is designed to have a quasi-optical (QO) external coupler utilizing optical wave superposition. The circuit design has been optimized by using a 1-D disk-model code and a 3-D particle-in-cell (PIC) solver. The iterative simulation analysis predicts that a five-gap configuration is the optimum structure for a QO-output cavity because it provides sufficient output power and stable single frequency operation without mode competition. The 3-D PIC simulation predicts that the designed circuit produces stable 50-kW output power from a 4-W input driving signal, with 40-dB gain, at 94.5 GHz. The frequency sweep predicts a 3-dB bandwidth of 150 MHz in 2π-mode operation. The numerical simulation results agree well with the small-signal analysis, thereby providing confidence in the predicted output performance of the QO klystron amplifier module.

68 citations

01 Mar 1972
TL;DR: In this paper, analytical expressions for axial and radial electric fields in axisymmetric interaction gaps of klystrons and coupled cavity traveling wave tubes are derived, where the field shape parameter m results in both limiting cases of the field at the tunnel tips and a continuous transition between these two limits.
Abstract: Analytic expressions for axial and radial electric fields in axisymmetric interaction gaps of klystrons and coupled cavity traveling wave tubes are derived. Introduction of the field shape parameter m results in both limiting cases of the field at the tunnel tips, that is, E equal to a constant and E approaching infinity as well as a continuous transition between these two limits. The transition represents actual, practical fields. This representation may be used to replace the somewhat arbitrary expressions being applied by various researchers to describe the fields.

65 citations

Book
22 May 2018
TL;DR: In this article, the authors present a survey of the theory and design of commercially significant types of gridded, linear-beam, crossed-field and fast-wave tubes.
Abstract: Do you design and build vacuum electron devices, or work with the systems that use them? Quickly develop a solid understanding of how these devices work with this authoritative guide, written by an author with over fifty years of experience in the field. Rigorous in its approach, it focuses on the theory and design of commercially significant types of gridded, linear-beam, crossed-field and fast-wave tubes. Essential components such as waveguides, resonators, slow-wave structures, electron guns, beams, magnets and collectors are also covered, as well as the integration and reliable operation of devices in microwave and RF systems. Complex mathematical analysis is kept to a minimum, and Mathcad worksheets supporting the book online aid understanding of key concepts and connect the theory with practice. Including coverage of primary sources and current research trends, this is essential reading for researchers, practitioners and graduate students working on vacuum electron devices.

62 citations