Design Consideration of 650-MHz Circular Electron–Positron Collider Klystron and Simulation of Its Beam Tester

Zaib, Un-Nisa; Fukuda, Shigeki; Zhou, Zhang Jian; Dong, Dong; Wang, Sheng-Chang; Xiao, Ouzheng; Lu, Z. H.; Pei, Guoxi

doi:10.1088/0256-307x/34/1/012902

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…The design of gun and collector is presented in the reference. [9] In this paper, the detailed design of RF section and high-power test results of this klystron are presented.…”

Section: Introductionmentioning

confidence: 99%

Design and high-power test of 800-kW UHF klystron for CEPC

Xiao¹,

Fukuda²,

Zhou³

et al. 2022

Chinese Phys. B

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To reduce the energy demand and operation cost for circular electron positron collider (CEPC), the high efficiency klystrons are being developed at Institute of High Energy Physics, Chinese Academy of Sciences. A 800-kW continuous wave (CW) klystron operating at frequency of 650-MHz has been designed. The results of beam–wave interaction simulation with several different codes are presented. The efficiency is optimized to be 65% with a second harmonic cavity in three-dimensional (3D) particle-in-cell code CST. The effect of cavity frequency error and mismatch load on efficiency of klystron have been investigated. The design and cold test of reentrant cavities are described, which meet the requirements of RF section design. So far, the manufacturing and high-power test of the first klystron prototype have been completed. When the gun operated at DC voltage of 80 kV and current of 15.4 A, the klystron peak power reached 804 kW with output efficiency of about 65.3% at 40% duty cycle. The 1-dB bandwidth is ±0.8 MHZ. Due to the crack of ceramic window, the CW power achieved about 700 kW. The high-power test results are in good agreement with 3D simulation.

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“…The design of gun and collector is presented in the reference. [9] In this paper, the detailed design of RF section and high-power test results of this klystron are presented.…”

Section: Introductionmentioning

confidence: 99%

Design and high-power test of 800-kW UHF klystron for CEPC

Xiao¹,

Fukuda²,

Zhou³

et al. 2022

Chinese Phys. B

Self Cite

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show abstract

“…1. [3] Now we changed to start from Fig. 1(b) to manufacture and test the klystron designed by classical approach.…”

Section: Introductionmentioning

confidence: 99%

Design and development of radio frequency output window for circular electron–positron collider klystron

Fukuda

Zhou

et al. 2018

Chinese Phys. B

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This paper presents the first phase of design, analysis, and simulation for the klystron coaxial radio frequency (RF) output window. This study is motivated by 800 kW continuous wave (CW), 650 MHz klystrons for the future plan of circular electron-positron collider (CEPC) project. The RF window which is used in the klystron output section has a function to separate the klystron from the inner vacuum side to the outside, and high RF power propagates through the window with small power dissipation. Therefore, the window is a key component for the high power klystron. However, it is vulnerable to the high thermal stress and multipacting, so this paper presents the window design and analysis for these problems. The microwave design has been performed by using the computer simulation technology (CST) microwave studio and the return loss of the window has been established to be less than −90 dB. The multipacting simulation of the window has been carried out using MultiPac and CST particles studio. Through the multipacting analysis, it is shown that with thin coating of TiN, the multipacting effect has been suppressed effectively on the ceramic surface. The thermal analysis is carried out using ANSYS code and the temperature of alumina ceramic is lower than 310 K with water cooling. The design result successfully meets the requirement of the CEPC 650 MHz klystron. The manufacturing and high power test plan are also described in this paper.

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Design Consideration of 650-MHz Circular Electron–Positron Collider Klystron and Simulation of Its Beam Tester

Cited by 2 publications

References 4 publications

Design and high-power test of 800-kW UHF klystron for CEPC

Design and high-power test of 800-kW UHF klystron for CEPC

Design and development of radio frequency output window for circular electron–positron collider klystron

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