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Nitrogen doping/infusion of 650 MHz cavities for CEPC

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Nuclear Science and Techniques 2021年第5期32卷 17-23页

作者： Peng Sha Jian-Kui Hao Wei-Min Pan Lin Lin Hong-Juan Zheng Xin-Ying Zhang Fang Wang Ji-Yuan Zhai Zheng-Hui Mi Fei-Si He Shu Chen Bai-Qi Liu Zhi-Tao Yang Chao Dong Zhong-Quan Li State Key Laboratory of Nuclear Physics and Technology&Institute of Heavy Ion Physics Peking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing 100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

The nitrogen doping/infusion of 650 MHz cavities for the circular electron positron collider(CEPC)is investigated in this *** 650 MHz 1-cell cavities are first treated via buffered chemical polishing(BCP),followed by nitrogen doping.A"2/6"condition is adopted,similar to that for 1.3 GHz cavities of Linear Coherent Light Source *** quality factor of both cavities improved to 7×10^(10)in low fields,i.e.,higher than that obtained from the baseline *** 650 MHz two-cell cavity is nitrogen infused at 165℃for 48 h with a BCP surface *** intrinsic quality factor(Q0)reached6×10^(10)at 22 MV/m in the vertical test,and the maximum gradient is 25 MV/m,which exceeds the specification of the CEPC(4×10^(10)at 22 MV/m).

关键词： Superconducting radio frequency cavity Nitrogen doping Nitrogen infusion Quality factor accelerating gradient

Beam transport design for a 1 MeV prototype dielectric wall accelerator

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Chinese Physics C 2014年第4期38卷 80-83页

作者：朱隽张篁彭士香任海涛夏连胜王文斗杨治勇谌怡石金水章林文邓建军 Institute of Fluid Physics China Academy of Engineering Physics State Key Laboratory of Nuclear Physics and Technology Peking University

The beam transport design of a novel proton dielectric wall accelerator is introduced in this paper. The protons will be accelerated from 40 keV to nearly 1 MeV under an accelerating gradient that is as high as 20 MV/m. A consideration of the beam line as well as the transport simulation is presented. The influences of the injection timing jitter and the accelerating pulse timing jitter are also discussed.

关键词： beam transport dielectric wall accelerator accelerating gradient transport simulation timing jitter

Recent progress on RF superconducting cavities

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Chinese Physics C 2009年第10期33卷 930-934页

作者：郝建奎赵夔 State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsPeking University

RF superconducting （SRF） cavities can work in continuous wave mode or long pulse mode. SRF technology has been developing rapidly since the end of the last century. RF superconducting technology is widely used in particle accelerators around the world. As the key elements, research on superconducting cavities is carried out worldwide. Besides Europe, the United States and Japan, many countries have already started SRF projects, such as Canada, India, Korea, etc. Great improvements on SRF technology have been made in China in recent years. Progress in SRF cavities is introduced in this paper.

关键词： superconducting cavities SRF accelerating gradient

An untuned MA-loaded cavity for HIRFL-CSR

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Chinese Physics C 2010年第8期34卷 1132-1135页

作者：梅立荣许哲原有进张生虎张周礼张聪孙列鹏金鹏岳伟明 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

In order to realize high energy density physics and plasma physics research at HIRFL-CSR, a magnetic alloy （MA）-loaded cavity has been studied. According to the theoretical calculation and simulation for the MA-loaded cavity, we achieved a better result. The MA-loaded cavity had a higher μQf value, with a higher shunt impedance and a higher accelerating gradient. The accelerating gradient was about 95 kV/m at 1.8003 MHz, 130 kV/m at 0.9000 MHz. Compared with the ferrite-loaded cavities that are used at HIRFL-CSR, with about 10 kV/m accelerating gradient, the MA-loaded cavity obviously has an advantage. The results of the theoretical calculation and the simulation, which meet the design requirements are in good agreement.

关键词： magnetic alloy material untuned MA-loaded cavity accelerating gradient

Researches on Large Grain SC Cavities at Peking University

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Chinese Physics C 2008年第z1期32卷 181-183页

作者：郝建奎赵夔张保澄全胜文王莉芳陈佳洱核物理与核技术国家重点实验室北京大学重离子物理研究所北京100871

Researches on large grain superconducting cavities are carried out at SRF laboratory of Peking University. A 1.3GHz TESLA type single cell cavity and a 1.3GHz 2-cell cavity made of large grain niobium were fabricated by Peking *** the collaboration of Jlab,the measured Eacc of the single-cell cavity reached 43.5MV/m after BCP,baking and high temperature heat treatment.

关键词： RF superconductivity superconducting cavities accelerating gradient

Recent Progress on RF Superconductivity and ERL

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Chinese Physics C 2008年第z1期32卷 200-203页

作者：郝建奎赵夔核物理与核技术国家重点实验室北京大学重离子物理研究所北京100871

RF superconducting cavities can work in CW mode or long pulse *** superconducting technology is widely used in particle *** development of RF superconductivity is limited by the material,surface treatment and *** technology is improved greatly after dozens of years'*** of techniques and experiences have been accumulated by running superconducting *** recent years,researches and developments have been carried out for future large scientific *** cavity shape and superconducting cavities made of large grain niobium are the hot frontiers in SRF *** Recovery Linacs have been developed in recent *** has many advantages such as high efficiency,energy saving,good stability,low radiation level,*** are more and more used in advanced light sources and free electron laser facilities.

关键词： RF superconductivity ERL accelerating gradient