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Kang, W.

Paper Title Page
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.

 
MPPT005 A New Slotted-Pipe Kicker Magnet for BEPCII Storage Ring 955
 
  • W. Kang, Y. Hao
    IHEP Beijing, Beijing
 
  The requirements of BEPCII injecting kicker magnets are so severe. In the range of ?x=±20mm, the field uniformity is required to be better than ±1% in the central plane, ±2% in the y=5mm plane and ±5% in y=10mm plane, while the effective beam impedance of each kicker magnet must be lower than 0.025O. For the large aperture of vacuum chamber and the fast risetime of kicker magnetic field, the two schemes of low impedance kicker magnets used in other accelerator labs in the world are not adaptive to the BEPCII storage ring. A new slotted-pipe kicker magnet, which uses the ceramic bars with metal coating films as the image current conducting paths, proposed in this article solves the difficult problems of BEPCII kicker magnet design. And the successful construction of a prototype has demonstrated that the new scheme of kicker magnets is viable and the structure design of the kicker magnet is reasonable.