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Development of High Intensity Beam Emittance Measurement Unit

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 287-291页

作者： LV PengNan PENG ShiXiang GUO ZhiYu YUAN ZhongXi REN HaiTao ZHAO Jie ZHANG Meng chen jiaer LU YuanRong State Key Laboratory of Nuclear Physics and Technology&Institute of Heavy Ion Physics Peking UniversityBeijing 100871China Graduate University of Chinese Academy of Sciences Beijing 100049China

Three sets of High Intensity Beam Emittance Measurement Units (HIBEMUs) are being developed at Peking University. They are HIBEMU-2 (slit-wire type, one direction), HIBEMU-3 (Allison scanner type, one direction) and HIBEMU-4 (slit-wire type, two directions). For HIBEMU-2 and HIBEMU-3, more recent work has been done on software redesign in order to measure beam emittance and to draw phase diagram more efficiently and precisely. Software for control and data processing of them were developed in Labveiw environment, trying to improve calculation rationality and to offer user-friendly interface. Mechanical modification was also done for HIBEMU-3, mainly concentrating on the protection of Faraday cups from being overheated by the high intensity beam and also from interference of secondary electrons. This paper will also cover the mechanical structure as well as the software development of HIBEMU-4, which is a two-direction emittance scanner newly designed and manufactured for the high energy beam transport (HEBT) of Peking University Neutron Imaging FaciliTY (PKUNIFTY). At the end of this paper, comparison and analysis of the three HIBEMUs are given to draw forth better design of the future emittance measurement facility.

关键词： emittance HIBEMU high intensity beam user-friendly program comparison.

Plasma parameter diagnosis using hydrogen emission spectra of a quartz-chamber 2.45 GHz ECRIS at Peking University

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Science China(Physics,Mechanics & Astronomy) 2018年第4期61卷 69-74页

作者： WenBin Wu HaiTao Ren ShiXiang Peng Yuan Xu JiaMei Wen Tao Zhang JingFeng Zhang AiLin Zhang Jiang Sun ZhiYu Guo jiaer chen State Key Laboratory of Nuclear Physics and Technology & Institute of Heavy Ion Physics Peking University

A quartz-chamber 2.45 GHz electron cyclotron resonance ion source(ECRIS) was designed for diagnostic purposes at Peking University [Patent Number: ZL 201110026605.4]. This ion source can produce a maximum 84 m A hydrogen ion beam at 50 k V with a duty factor of 10%. The root-mean-square(RMS) emittance of this beam is less than 0.12π mm mrad. In our initial work,the electron temperature and electron density inside the plasma chamber had been measured with the line intensity ratio of noble gases. Based on these results, the atomic and molecular emission spectra of hydrogen were applied to determine the dissociation degree of hydrogen and the vibrational temperature of hydrogen molecules in the ground state, respectively. Measurements were performed at gas pressures from 4×10^(-4) to 1×10^(-3) Pa and at input peak RF power ranging from 1000 to 1800 W. The dissociation degree of hydrogen in the range of 0.5%-10% and the vibrational temperature of hydrogen molecules in the ground state in the range of 3500-8500 K were obtained. The plasma processes inside this ECRIS chamber were discussed based on these results.

关键词： electron cyclotron resonance ion source(ECRIS) hydrogen plasma optical emission spectroscopy dissociation degree of hydrogen vibrational temperature

Tuner design and RF test of a four-rod RFQ

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 271-273页

作者： QuanFeng Zhou (1) Kun Zhu (1) ZhiYu Guo (1) MingLei Kang (1) ShuLi Gao (1) YuanRong Lu (1) jiaer chen (1) 1. State Key Lab of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China

A mini-vane four-rod radio frequency quadruple (RFQ) accelerator has been built for neutron imaging. The RFQ will operate at 201.5 MHz, and its length is 2.7 m. The original electric field distribution along the electrodes is not flat. The resonant frequency needs to be tuned to the operating value. And the frequency needs to be compensated for temperature change during high power RF test and beam test. As tuning such a RFQ is difficult, plate tuners and stick tuners are designed. This paper will present the tuners design, the tuning procedure, and the RF properties of the RFQ.

关键词： four-rod RFQ electric-field distribution RF tuning RF measurement

Multiple charge ion beam generation with a 2.45 GHz electron cyclotron resonance ion source

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Science China(Physics,Mechanics & Astronomy) 2017年第6期60卷 74-77页

作者： Yuan Xu ShiXiang Peng HaiTao Ren JiaMei Wen AiLin Zhang Tao Zhang JingFeng Zhang WenBin Wu ZhiYu Guo jiaer chen State Key Laboratory of Nuclear Physics and Technology & Institute of Heavy Ion Physics Peking University Beijing 100871 China University of Chinese Academy of Sciences Beijing 100049 China

Multiple charge ions (MCIs) are necessary for increasing the output energy of particles in accelerators. In general, MCI beams are largely produced by electron beam ion source (EBIS) [1], laser ion source (LIS) [2], or high-frequency (mostly >5 GHz) electron cyclotron resonance (ECR) ion source [3]. Among these, only ECR ion source can operate in the continuous wave (CW) mode, while EBIS and LIS only support pulses. In addition, ECR ion source with lower frequency (mostly 2.45 GHz) are required primarily for generating single charge state ions, because the corresponding ECR field (875 Gs) is not sufficiently strong for MCI generation [4].

关键词： mostly operate generating sufficiently primarily largely

The influence of target material and thickness on proton energy and angular distribution

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 457-461页

作者： SU LuNing LIU Bicheng LIN XiaoXuan LIU Feng DU Fei LIU XiaoLong ZHENG Yi GE XuLei LI YuTong SHENG ZhengMing chen LiMing WANG WeiMin MA JingLong LU Xin WEI ZhiYi chen jiaer ZHANG Jie Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsPeking University Key Laboratory for Laser Plasmas(Ministry of Education) and Department of Physics Shanghai Jiao Tong University

The paper has studied the influence of target material and thickness on energy and angular distributions of the protons generated by using an 800 rim, 60 fs, 0.24 J laser pulse to irradiate solid target foils. The results show that the initial density and thickness of the targets will affect the formation of the acceleration sheath fields in the target normal direction. For the same target thickness, using lower density target materials can obtain a higher proton maximum energy. However, lower density targets tend to be deformed due to the shock waves launched by the laser pulses, making the proton spatial distribution more divergent.

关键词： laser-driven proton acceleration

Tuner design and RF test of a four-rod RFQ

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Tuner design and RF test of a four-rod RFQ

Progress in the beam commissioning of separated function RFQ accelerator

第一届中国粒子加速器会议

作者： ZHOU QuanFeng ZHU Kun GUO ZhiYu KANG MingLei GAO ShuLi LU YuanRong chen jiaer State Key Lab of Nuclear Physics and Technology School of PhysicsPeking University

A mini-vane four-rod radio frequency quadruple(RFQ) accelerator has been built for neutron *** RFQ will operate at 201.5 MHz,and its length is 2.7 *** original electric field distribution along the electrodes is not *** resonant frequency needs to be tuned to the operating *** the frequency needs to be compensated for temperature change during high power RF test and beam *** tuning such a RFQ is difficult,plate tuners and stick tuners are *** paper will present the tuners design,the tuning procedure,and the RF properties of the RFQ.

关键词： four-rod RFQ electric-field distribution RF tuning RF measurement

来源： cnki会议评论

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 222-224页

作者： MingLei Kang (1) YuanRong Lu (1) Zhi Wang (1) Kun Zhu (1) XueQing Yan (1) ZhiYu Guo (1) ShuLi Gao (1) ShiXiang Peng (1) Ao Liu (2) JiaXun Fang (1) jiaer chen (1) 1. State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China2. Department of Physics Indiana University Bloomington IN 47405 USA

Separated Function RFQ (SFRFQ) was proposed as a post accelerator of RFQ to accelerate heavy ions at low frequency. It introduces gap accelerating in the quadrupole electrodes, and therefore it has higher accelerating efficiency than the conventional RFQ accelerator. The first SFRFQ prototype cavity has been specially designed and constructed as a post accelerator to accelerate O+ beam from 1.03 MeV to 1.64 MeV. Based on accomplishment of low power measurement and high power test, the beam commissioning was carried out to verify its feasibility. The measured energy gain per cell of SFRFQ is 45 keV, which is about 60% higher than that of Peking University Integral Split Ring (ISR) RFQ.

关键词： separated function RFQ beam commissioning energy spectrum

Development of High Intensity Beam Emittance Measurement Unit

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Development of High Intensity Beam Emittance Measurement Uni...

RF and field measurements of the SSC-LINAC RFQ

第一届中国粒子加速器会议

作者： LV PengNan PENG ShiXiang GUO ZhiYu YUAN ZhongXi REN HaiTao ZHAO Jie ZHANG Meng chen jiaer LU YuanRong State Key Laboratory of Nuclear Physics and Technology & Institute of Heavy Ion Physics Peking University Graduate University of Chinese Academy of Sciences

Three sets of High Intensity Beam Emittance Measurement Units(HIBEMUs) are being developed at Peking *** are HIBEMU-2(slit-wire type,one direction),HIBEMU-3(Allison scanner type,one direction) and HIBEMU-4(slit-wire type, two directions).For HIBEMU-2 and HIBEMU-3,more recent work has been done on software redesign in order to measure beam emittance and to draw phase diagram more efficiently and *** for control and data processing of them were developed in Labveiw environment,trying to improve calculation rationality and to offer user-friendly interface. Mechanical modification was also done for HIBEMU-3,mainly concentrating on the protection of Faraday cups from being overheated by the high intensity beam and also from interference of secondary *** paper will also cover the mechanical structure as well as the software development of HIBEMU-4,which is a two-direction emittance scanner newly designed and manufactured for the high energy beam transport(HEBT) of Peking University Neutron Imaging FaciliTY (PKUNIFTY).At the end of this paper,comparison and analysis of the three HIBEMUs are given to draw forth better design of the future emittance measurement facility.

关键词： emittance HIBEMU high intensity beam user-friendly program comparison

来源： cnki会议评论

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1311-1317页

作者： LIU Ge LU YuanRong YIN XueJun ZHANG XiaoHu DU Heng JIANG PeiYong LI ZhongShan LI XiaoNi HE Yuan WANG Zhi GAO ShuLi YANG YaQing ZHU Kun YAN XueQing chen jiaer YUAN YouJin XIA JiaWen ZHAO HongWei State Key Lab of Nuclear Physics and Technology Peking University Institute of Modern Physics Chinese Academy of Sciences

The 53.667 MHz continuous-wave heavy ion RFQ has been designed and manufactured for the SSC-LINAC *** four-rod RFQ accelerates ions with maximum mass to charge ratio of 7 from 3.728 keV/u to 143 keV/*** have been carried out to check the RF performance of the cavity and the quality of the electric *** S11 of the power coupler is adjusted to better than-44 dB,and the Q0 of the cavity is *** quality of the electric field is evaluated by the perturbation *** measurement procedure and data analysis will be discussed in *** error due to gravity of the perturbation bead has been corrected by averaging the fields in different *** a result,the unflatness of the electric field is±2.5%,and the dipole field component distributes from 0%to 20%in different longitudinal positions,which indicates the asymmetry of the quadrupole *** unflatness of the quadrupole field distribution represents a good agreement with the simulation *** power RF test and beam commissioning of the RFQ are on schedule in early 2014.

关键词： RFQ continuous-wave heavy ion perturbation method field distribution