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The high-power thyristors are the core component of the HVDC systems. Traditional thyristors are triggered by the electric current pulses, as the development of the laser technology; light-triggered thyristors (LTT) are used more widely in the HVDC field due to its low triggering power and strong resistance against electromagnetic interferences. In connection with the current situation that the researches...
Enhance the efficiency of beam-wave interaction is an important problem in the design of folded waveguide traveling-wave tube (TWT) amplifier. A dielectric-loaded tapered folded waveguides was studied, whose equivalent circuit analysis is mainly introduced in this paper.
The paper presents a novel cascaded folded waveguide traveling wave tube (FW-TWT) interacting with two beams operating at TE20 mode. This cascaded structure is constructed by two sections. The downstairs section interacts with the two beams to amplify the signal initially. It also provides the upstairs section with small input power. The upstairs section continues to amplifying the signal. Both the...
This paper presents an All-in-one simulation method for klystron. The simulation results compared with conventional simulation results are also presented. Conventional simulation method calculates the klystron in part. The electron gun, beam-wave interaction and the collector are designed respectively, and thus the simulation results are inauthentic commonly. The All-in-one simulation method uses...
In present work, the test of terahertz Extended Interaction oscillator is reported. The high frequency structure (HFS) is employed with the folded waveguide, which is fabricated with high speed numerical milling. The preliminary test shows that the oscillator can produce the power exceeds 2W at operating frequency 308GHz. The optimum design is going forward as planned.
The design of a 340GHz two-beam folded waveguide (FW) traveling-wave amplifier with >4 W of power over with the input power of 20mW is presented. The amplifier is driven by two electron guns (70mA×2, 14.9kV) and 1T magnetic field. The design is performed by CST Particle Studio. Particle-in-cell (PIC) simulations were carried out to predict and optimize the performance of the folded waveguide TWT.
The extended interaction oscillator (EIO) is regarded as a novel type of high power terahertz (THz) source, which has promising application prospects in radar, medical imaging etc. Up to now, CPI and other institutes have developed many types of EIO. For satisfying with the application request, the EIO with operation frequency exceeding 300GHz is designed and studied with three-dimensional particle-in-cell...
The extended interaction oscillator (EIO) is regarded as a novel type of high power terahertz (THz) source, which has promising applications prospects in military radar, medical imaging and wireless communications, etc. For being satisfied with the widely applications, a THz EIO operation at G-band is designed and studied with three-dimensional particle-in-cell simulation at IECAS. To improve the...
This paper presents the simulation study of a C band klystron with a disc-load waveguide traveling wave output structure. The electron gun with a perveance of 1.5μp is designed. A 3-cell disc-loaded waveguide output structure working at π/2 mode is adopted in the circuit design. The beam-wave interaction system with disc-loaded waveguide output structure is simulated by PIC code. More than 50MW output...
An X-band to Ka-band klystron frequency multiplier was developed that can triple input frequency and amplify input power simultaneously. It had X-band components except a Ka-band output section. The experimental results showed that the peak output power of 14 kW can be reached at beam voltage of 36kV.
A sheet-beam Extended Interaction Klystron (SBEIK) is an attractive MMW amplifier because of its high gain per unit length and compact configuration. The output cavity is an important part of the whole tube, which is used for RF power extraction. In this paper, multi-gap extended output cavity designs of SBEIK are presented by 3D simulations, RF parameters have been calculated. Beam wave interaction...
In this paper, a novel terahertz (THz) extended interaction oscillator (EIO) is presented. Adopting PIC code, design and optimization geometry of EIO is performed, which is composed of ladder loaded rectangular waveguide. In present work, the operation center frequency of THz EIO is 105GHz, and the output power 673W is achieved, the efficiency reaches 12.1%, which is beam voltage and beam current...
In China, the R&D of high peak power klystron has been made much progress in recent years. In 2010, the Institute of Electronics, Chinese Academy of Sciences (IECAS) has successfully developed S-band 100MW klystron, and, currently, are developing an S-band 150MW klystron. The Institute of High Energy Physics, Chinese Academy of Sciences (IHEP) cooperated with the Hang Guang Electrical Factory...
High-data-rate short-range communication and image systems beyond 100GHz impose crucial requirements on signal sources, demanding superior purity and stability. Using frequency multipliers with high efficiency and multiplication factor to generate the Nth harmonic signal that is phase-locked by a PLL at the fundamental frequency provides an alternative solution. The desired signal in an active frequency...
In this paper, a two-section folded waveguide of Terahertz (THz) extended interaction oscillator (EIO) is presented, which is studied by the help of particle-in-cell (PIC) simulation. The output power and operation frequency are studied.
Free space laser communication becomes one of the most attractive research pot of next generation optical communication technologies due to its advantages of large data transmission amount, high directionality of transmission and high transmission security. The tapered semiconductor lasers are one of the most important optical sources in such systems. In this paper, we introduce the structure design,...
Steam generator (SG) is one of the key important equipments to safety of nuclear power plant (NPP), its reliability is the one vital weakness of nuclear steam supply system (NSSS), so it is necessary for ageing management (AM) to increase its reliability for safety operation. However the SG AM data has not always been readily available, thus the Ageing Management Database of the Steam Generator of...
In this paper, by means of a 3D particle-in-cell (PIC) code, the non-linear calculation of beam-wave interaction in periodic cusped magnetic (PCM) field is presented for the X-band sheet beam klystron with five three-cell, extended interaction cavities. The simulation results show that the output peak power is more than 32.4 MW, with the interaction efficiency of more than 31.2%, and the gain of more...
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