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Zhou, D.M.

Paper Title Page
MPPP026 Development of Longitudinal Coupling Impedance Measurement Platform for BEPCII 1940
 
  • G. Huang, W.-H. Huang, S. Zheng
    Tsinghua University, Beijing
  • J.Q. Wang, D.M. Zhou
    IHEP Beijing, Beijing
  
  Funding: Supported by NSFC 10375035.

A coaxial line impedance measurement platform is developed for BEPCII. A pair of gradual change impedance matching section is designed and fabricated by numerical control milling machine. The special designed RF connector is applied to strengthen the inner conductor. The algorithm of TRL calibration is applied in the system to avoid the usage of a reference pipe for each device under test. The measurement is accomplished by a VNA under the control of the software written in LabView.

 
MPPP052 Longitudinal Impedance Measurements of the Components for the BEPCII 3212
 
  • D.M. Zhou, W. Kang, J.Q. Wang, L.J. Zhou
    IHEP Beijing, Beijing
  • G. Huang
    TUB, Beijing
  
  Funding: Work supported by the National Natural Science Foundation of China (NSFC) under contract No.10375076.

A longitudinal impedance measurement system was established for the BEPCII. The measurements, done in the frequency domain, are based on the coaxial wire method using HP/Agilent 8720ES network analyzer. The applications of the TRL calibration technique and absorbers were investigated to find a good approach for impedance measurements. The impedance, larger than 20 Ohm and below 6 GHz, can be measured using the TRL calibration technique in the experiment. And better measurement results were got using the reference pipes with the absorbers. So, this system satisfies the requirements of the BEPCII. This paper gives a review on this impedance measurements system for the BEPCII. The measurements results show that there are no serious impedance problems for BEPCII bellows and injection kickers, agreeing well with the numerical simulations. More improvements on this system are in progress.

 
WPAT011 Application of TRL Calibration in Longitudinal Coupling Impedance Measurement Platform for BEPCII 1225
 
  • G. Huang, W.-H. Huang, S. Zheng
    Tsinghua University, Beijing
  • D.M. Zhou
    IHEP Beijing, Beijing
  
  Funding: Supported by NSFC 10375035.

TRL calibration is one of the standard calibration methods for RF measurement. Applying the TRL calibration method into the longitudinal coupling impedance platform makes it possible to eliminate the error matrix of the matching section and the RF connector. By using TRL calibration in the platform, the reference pipe of each device under test no longer required. The formula of the calibration is discussed in this paper and the software based on it is introduced.