Author: Chen, H.B.
Paper Title Page
MOPFI037 Design and Experiment of a Compact C-band Photocathode RF Gun for UED 369
  • X.H. Liu, H.B. Chen, W.-H. Huang, C.-X. Tang, Z. Zhang
    TUB, Beijing, People's Republic of China
  A compact C-band photocathode RF gun for the MeV UED facility is developed in Tsinghua University, which is designed to work at the frequency of 5.712GHz. This paper presents the physics and RF structure design, and beam dynamics optimization of this C-band RF gun. Some new structure design will be adopted in this gun, including the optimized cavity length and elliptical iris, which is helpful to achieve lower emittance and larger mode separation. This paper likewise presents experiment parameters and the cold test results of this C-band RF gun.  
TUPME026 Optimization on RF parameters of a Choke-Mode Structure for the Clic Main LINAC 1628
  • H. Zha, H.B. Chen, J. Shi
    TUB, Beijing, People's Republic of China
  Funding: This work was support by the National Natural Science Foundation of China (Grant No. 11135004).
A tapered choke-mode structure for the main linac of Compact Linear Collider (CLIC) had been designed. Wakefield suppression of this structure fits the beam dynamic requirements. But it has a lower RF performance compared to the baseline design of CLIC main linac. A genetic algorithm is used in the procedure to find the optimum solution. A new choke-mode structure with 24 regular cells working on 100MV/m has been design, which fits beam dynamic constraints and has higher RF efficiency and lower surface field.
WEPFI031 Development of an X-Band Metallic Power Extractor for the Argonne Wakefield Accelerator 2771
  • J. Shi, H.B. Chen, Q. Gao, X.W. Wu, Y. Yang, H. Zha
    TUB, Beijing, People's Republic of China
  • W. Gai, C.-J. Jing
    ANL, Argonne, USA
  An X-band (11.7GHz) power extractor has been developed for RF power generation at Argonne Wakefield Accelerator (AWA). The structure is a 2pi/3-mode disk-loaded structure with group velocity of 22% of the speed of light and a total length of about 300mm. It is build with copper disks brazed together. This note presents the design and the fabrication of this structure, as well as the RF measurement results.  
WEPFI032 New Calibration Method for Radial Line Experiment 2774
  • X.W. Wu, H.B. Chen, J. Shi, H. Zha
    TUB, Beijing, People's Republic of China
  A radial line experiment is proposed to test the SiC load disks of the choke-mode structure. However, the general calibration cannot work out in this situation due to lack of matched load. A new calibration method named multi-offset short calibration is proposed. The principles of the method and the calibration steps involved are presented and the results of actual experimentation are used to validate the method. The results show multi-offset short calibration is a feasible method and that this method can provide a viable calibration scheme for radial line measurements.  
THPWA016 Design and Optimization of the Target in Electron Linear Accelerator 3663
  • Q. Gao, H.B. Chen, J. Shi, H. Zha
    TUB, Beijing, People's Republic of China
  The target in electron linear accelerator plays an important role in the production of photon. Different materials and thickness of target have influence on dose rate. For 6MeV electron beam, this study gives the thickness of target for several materials in which the dose rate can be higher and drain electron can be lower. Then a X-ray target had been designed for 6MeV electron linac by FLUKA simulations. It can deliver 1000 cGy/min at 1 meter in front of the target if providing 6 MeV electron beam with 100uA current, which can achieve high-dose rate radiotherapy.  
THPWA018 High Power Test of a C-band 6 MeV Standing-wave Linear Accelerator 3666
  • J.H. Shao, H.B. Chen, Y.-C. Du, Q.X. Jin, J. Shi, H. Zha
    TUB, Beijing, People's Republic of China
  A C-band 6MeV standing-wave bi-periodic on-axis coupled linear accelerator has been developed at the accelerator laboratory of Tsinghua University [1,2]. In the recent high power RF test, the capture ratio, the energy spectrum, the spot size and the dose rate of this accelerator have been measured. With a 2.07-MW input power, the peak current is 130mA and the output spot root-mean-square diameter is about 0.8mm. The output kinetic energy is 6.0MeV with a spectrum FWHM of 7.5%. In this paper, the setup and detailed results of the high power RF test are presented.  
  • Y. Zhang, H.B. Chen, Q. Gao, J. Shi
    TUB, Beijing, People's Republic of China
  Smuggling of nuclear material is a serious threat to security of international society. Formal research on nuclear material discrimination can fulfil customs inspection requirement. This paper designs a situation that nuclear material which is packaged and shielded by heavy metal need to be discriminated accurately on the condition that the object being detected cannot be dismantled. Calculation results prove nuclear material could be discriminated accurately while the ideal condition is fulfilled. If multi-energy X-ray source is used the discrimination accuracy is declined. However the accuracy could be improved while energy spectrum shaping technique is used.  
THPWO051 Status of CPHS Project 3887
  • S.X. Zheng, H.B. Chen, C. Cheng, Q. Du, T. Du, X. Guan, X.Y. Jia, C. Jiang, H.T. Lu, C.-X. Tang, D. Wang, D. Wang, X.W. Wang, H.Y. Zhang, Z. Zhang
    TUB, Beijing, People's Republic of China
  • W.Q. Guan, Y. He, J. Li, D.-S. zhang
    NUCTECH, Beijing, People's Republic of China
  CPHS (Compact Pulsed Hadron Source) project was initiated in Tsinghua University at 2009. It consists of a 13 MeV proton Linac (RFQ+DTL), a neutron target station and some neutron stations. The construction of 3 MeV Linac (RFQ only) and target station will be finished at the end of 2012. And initial commissioning will be started at the early of year 2013. The progress and results of early commissioning will be presented at this paper. Then we will report the next plan also.