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RF study of a c-band barrel open cavity pulse compressor

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chinese Physics c 2015年第5期39卷 109-112页

作者：束冠赵风利贺祥 Laboratory of Particle Acceleration Physics & Technology Institute of High Energy PhysicsChinese Academy of Sciences University of chinese Academy of Science

This paper focuses on the RF study of a c-band barrel open cavity （BOc） pulse compressor. The operating principle of BOc is presented and the technical specifications are determined. The main parts of BOc such as the cavity, the matching waveguide, the coupling slots and the tuning rings were numerically sinmlated by 3-D codes software HFSS and cST Microwave Studio （MWS）. The ＂whispering gallery＂ mode TM6,1,1 with an unload Q of 100000 was chosen to oscillate in the cavity. An energy multiplication factor of 1.99 and a peak power gain of 6.34 was achieved theoretically.

关键词： c-band BOc pulse compressor HFSS MWS energy multiplication factor peak power gain

New linear accelerator (Linac) design based on c-band accelerating structures for SXFEL facility

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chinese Physics c 2011年第11期35卷 1066-1069页

作者：张猛顾强 Shanghai Institute of Applied Physics Chinese Academy of Sciences

A c-band accelerator structure is one promising technique for a compact XFEL facility. It is also attractive in beam dynamics in maintaining a high quality electron beam, which is an important factor in the performance of a free electron laser. In this paper, a comparison between traditional S-band and c-band accelerating structures is made based on the linac configuration of a Shanghai Soft X-ray Free Electron Laser （SXFEL） facility. Throughout the comprehensive simulation, we conclude that the c-band structure is much more competitive.

关键词： linac c-band free electron laser

Design of a c-band relativistic extended interaction klystron with coaxial output cavity

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chinese Physics c 2015年第7期39卷 93-96页

作者：吴洋赵德奎陈永东 Institute of Applied Electronics China Academy of Engineering Physics Science and Technology on High Power Microwave Laboratory Sichuan University of Science and Engineering

In order to overcome the disadvantages of conventional high frequency relativistic klystron amplifiers in power capability and RF conversion efficiency, a c-band relativistic extended interaction klystron amplifier with coaxial output cavity is designed with the aid of PIc code MAGIc. In the device, disk-loaded cavities are introduced in the input and intermediate cavity to increase the beam modulation depth, and a coaxial disk-loaded cavity is employed in the output cavity to enhance the RF conversion efficiency. In PIc simulation, when the beam voltage is680 k V and current is 4 k A, the device can generate 1.11 GW output power at 5.64 GHz with an efficiency of 40.8%.

关键词： high power microwave c-band relativistic extended interaction klystron PIc simulation

Design of a high-efficiency c-band backward wave oscillator

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chinese Physics c 2010年第7期34卷 1016-1018页

作者：马乔生张运俭邓德荣谭杰刘忠 Institute of Applied Electronics

For practicability of the high power microwave source,a c-band backward wave oscillator（BWO） which has high conversion efficiency is *** the axial guiding magnetic field is 0.83 T,the electron energy and the beam current of the diode are respectively 80 keV and 2.1 kA,a microwave output power of 100 MW at 7.4 GHz microwave frequency with 65% conversion efficiency is achieved in simulation.

关键词： high conversion efficiency c-band BWO miniaturization

Design,fabrication,and cold-test results of c-band spherical RF pulse compressor prototype

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Radiation Detection Technology and Methods 2019年第3期3卷 37-44页

作者： Zong‑Bin Li Wen‑cheng Fang Qiang Gu Jian‑Hao Tan Xiao‑Xia Huang Zhen‑Tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of chinese Academy of Sciences Beijing 100049China

Purpose Pulse compressor is a useful and common RF structure for Free Electron Laser and Linear collider Facilities, whichcan improve the input power of accelerating structures *** In this study, we designed, fabricated and tested a prototype of a compact c-band spherical pulse *** pulse compressor utilizes one high Q0 spherical RF resonant cavity that works with two degenerated TE1,1,3modes anda dual-mode polarized coupler. The cavity and coupler were designed and machined separately and then brazed *** prototype was tested carefully using vector network analyzer, and a cold-test system was set up to check the workingconditions of the spherical pulse compressor with inversed input powerResults Associated with the c-band high-gradient accelerating structures, the peak power gain and energy multiply factorcan be as high as 6.1 and 1.85, respectively, in theory. The average power gain is 3.8 in the first 0.372 μs after the phasereverse, which is the accelerator filling time. During the cold test, a peak power multiply factor of 6.04 and an energy multiplyfactor of 1.83 were *** The test results agreed with the design well. The prototype was successfully made as a pre-research for thefuture energy multiplying scheme of SXFEL.

关键词： Pulse compressor c-band Spherical RF measurements cold test

conceptual study and design of A c-band photocathode injector

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Radiation Detection Technology and Methods 2019年第3期3卷 168-177页

作者： Wencheng Fang Lin Wang Zhentang Zhao Shanghai Synchrotron Radiation Facility(SSRF) Chinese Academy of SciencesShanghai 201800China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of chinese Academy of Sciences Beijing 100049China

Purpose A c-band photocathode injector composed of a 3.6-cell c-band photocathode RF gun and two 1.8-m c-band accelerating structures is *** injector is a low emittance electron source for free electron lasers(FEL)and other compact light *** The RF structure of the cavities is designed with 2D SUPERFISH *** beam dynamic study in ASTRA helps rectify the 2D RF *** feed the cavities,a design of extracoaxial coupler with RF gun structure is *** With compact focusing solenoids,for 0.25 nc bunch charge,the final energy can reach 6.9 MeV energy and the 95%emittance can be as low as 0.23 mm mrad(95%).conclusion All the details of RF design and beam dynamics studies are presented in this paper,and the design satisfied the requirements of FEL and other applications.

关键词： c-band Photocathode Gun Low emittance High gradient

Physical design and cooling test of c-band standing wave accelerating tube

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chinese Physics B 2006年第2期15卷 319-323页

作者：柏伟许州金晓黎明 Institute of Applied Electronics China Academy of Engineering Physics Mianyang 621900 China

The physical design and cooling test of a c-band 2MeV standing wave （SW） accelerating tube are described in this paper. The designed accelerating structure consists of 3-cell buncher and 4-cell accelerating section with a total length of about 163mm, excited with 1MW magnetron. Dynamic simulation presents that about 150mA beam pulse current and 30% capture efficiency can be achieved. By means of nonlinear Gauss fit on electron transverse distribution, the diameter of beam spot FWHM （full width at half maximum of density distribution） is about 0.55mm. cooling test results of the accelerating tube show that frequencies of cavities are tuned to 5527MHz and the field distribution of bunching section is about 3：9：10.

关键词： c-band standing wave accelerating tube space charge effect

Mode-locked fiber laser in the c-band region for dual-wavelength ultrashort pulses emission using a carbon nanotube saturable absorber

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chinese Optics Letters 2019年第5期17卷 30-33页

作者： Kuen Yao Lau Pin Jern Ker Ahmad Fauzi Abas Mohammed Thamer Alresheedi Mohd Adzir Mahdi Electronics Research Group. Institute of Power Engineering Uni ver sit i Tenaga Nasional43000 Kajang SelangorMalaysia Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia Wireless and Photonics Networks Research centre Faculty of EngineeringUniversiti Putra Alalaysia43400 UPM Ser dangSelangorJMalaysia

A saturable absorber is commonly employed to generate an ultrashort laser with a mode-locking scheme. In an erbium-doped fiber laser system, the laser regimes of either 1530 or 1550 nm wavelength are procured based on the absorption profile of the erbium-doped fiber. The absorption of the erbium-doped fiber is designed to emit at both wavelengths by controlling the net gain of the laser cavity. Subsequently, simultaneous erbium-doped fiber laser emission is attained at 1533.5 and 1555.1 nm with the pulse duration of 910 and 850 fs, ***, this work maximizes the output portfolios of a mode-locking fiber laser for dual-wavelength ultrashort pulses emission.

关键词： mode-locking scheme c-band region dual-wavelength ultrashort pulses emission using

Three Dimensional PIc Simulation of a c-band Relativistic Magnetron

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chinese Physics c 2008年第Z1期32卷 268-270页

作者：赵林钱宝良李锐杜广星国防科学技术大学光电科学与工程学院长沙410073

The dispersion relation of a conventional 6-vane relativistic magnetron is derived and numerically calculated, which is employed to analyze the operating frequency of the *** results of three-dimensional particle-in-cell simulation show that an average output microwave power of about 0.96GW at 4.5GHz is obtained at the beam energy of 437keV and current of 12.2kA when the externally applied magnetic field is about *** efficiency is about 18%. An average output power of microwave about 4.4GW at 4.37GHz is also obtained at the beam energy of 1.05MeV and the current of *** when the structure parameters are *** efficiency is about 20%.

关键词： relativistic magnetron high-power microwave c-band dispersion relation particle simulation