Author: Geng, H.
Paper Title Page
MOPME031 Emittance Measurement with Multi-wire Scanners for BEPC-II Linac 541
  • H. Geng, W.B. Liu, W. Qiao, Q. Qin, Y.F. Sui, Y. Yue
    IHEP, Beijing, People's Republic of China
  During the BEPC-II linac upgrade, five wire scanners have been installed in the common transport line, which makes a fast emittance measurement possible. In this paper, we will show the primary results of BEPC-II linac emittance measurement using multi-wire scanner method. The least squares method will be used for data analysis. A comparison of the results with the ones obtained by quad scan method will also be given.  
MOPME033 Wire Scanner Emittance Measurement and Software Design at BEPCII 544
  • W. Qiao, Z. Duan, H. Geng, W.B. Liu, Y.F. Sui
    IHEP, Beijing, People's Republic of China
  Wire scanners are diagnostic devices to measure the beam profile. Resent years, BEPCII adopts wire scanner measurement system for accurate beam size and emittance measurements. Beam emittance measurements can be performed with no adverse impact on beam and no interruption to normal machine operation. The BEPCII wire scanner system includes sets of four scanners in linac by which the linac output emittance is determined. In order to make the measurement procedure automated and easily accessible to all operators, wire scanner measurement software is developed. The software can obtain real-time signal data from the Experimental Physics and Industrial Control System(EPICS) and emittance calculation, phase chart and optics envelope display will be done. In this paper we describe the construction, performance and uses of BEPCII wire scanners measurement system and software.  
TUPME021 Optimization Parameter Design of a Circular e+e Higgs Factory 1616
  • D. Wang, Y.W. An, J. Gao, H. Geng, Y.Y. Guo, Q. Qin, N. Wang, S. Wang, M. Xiao, G. Xu, S.Y. Xu
    IHEP, Beijing, People's Republic of China
  Funding: NSFC:11175192
In this paper we will show a genral method of how to make an optimized parameter design of a circular e+e Higgs Factory by using analytical expression of maximum beam-beam parameter and beamstrahlung beam lifetime started from given design goal and technical limitations. A parameter space has been explored.
TUPWO019 A Local Achromatic Design of C-ADS MEBT2 1922
  • H. Geng, Z. Guo, Z. Li, C. Meng, S. Pei, J.Y. Tang
    IHEP, Beijing, People's Republic of China
  The accelerator of China Accelerator Driven Sub-critical system consists of two injectors to ensure its high reliability. The Medium Energy Beam Transport line-2 is an essential part of the accelerator to transport and match the beam from either injector to the main linac. This paper presents a local achromatic design, which uses four bending magnets, for CADS MEBT2. It is found that both transverse and longitudinal emittance growths can be well controlled below 15% from MEBT2 entrance to the exit of the following superconducting spoke-021 section. The beam dynamics of MEBT2 will be discussed and the multi-particle tracking results will also be shown.  
TUPWO020 Error Analysis for C-ADS MEBT2 1925
  • H. Geng, Z. Guo, Z. Li, C. Meng, S. Pei, J.Y. Tang
    IHEP, Beijing, People's Republic of China
  A local achromatic scheme has been developed for C-ADS MEBT2. This paper presents the error analysis results for this MEBT2 scheme. The effects of magnet and cavity misalignment, static and dynamic errors of electric and magnetic field, the displacement of the input beam as well as the initial mismatches of the incoming beam will be studied. Beam trajectory correction scheme will also be discussed.  
THPWO043 Progress on the Physics Design of the C-ADS Injector Scheme I 3863
  • Z. Li, P. Cheng, H. Geng, C. Meng, H.F. Ouyang, B. Sun, J.Y. Tang, F. Yan, Z. Yang
    IHEP, Beijing, People's Republic of China
  Funding: Surported by China ADS Project
The China ADS (C-ADS) driver linac is composed of two parallel 10 MeV injectors and a main linac which boosts the beam further to 1.5 MeV. There are two design schemes for the injectors based on different working frequency and superconducting cavity structures and are under developing at the same time on IHEP and IMP. The Injector Scheme I, which is proposed by IHEP, works at 325 MHz, the same frequency of the main linac, and superconducting Spoke cavities with geometry beta of 0.12, the same type of cavity as the main linac too, are applied after the RFQ. In this paper, the latest progress on physics design will be presented.