SRF2011 - List of Authors (Zhang, S.H.)

Paper	Title	Page
MOPO031	Electro-Magnetic Optimization and Analyses of Etching for HIRFL Quarter-Wave Resonators	147
	C. Zhang, W. Chang, Y. He, S.H. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	A superconducting accelerating section for SSC-linac system (injector into separated sector cyclotron) is under development at the HIRFL (heavy ion research facility of Lanzhou). Two types of superconducting quarter-wave resonators (81.25 MHz, optimum β = 0.041 and 0.085) will be used for acceleration to energies of up to 10 MeV per nucleon. The β=0.041 QWR works at the accelerating voltage of 0.75 MV and β=0.085 QWR works at 1.5 MV, in order to reach a record high performance, the EM design was carefully optimized for both cavities. A selected number of cavity geometry parameters were analyzed to see how they affect the electro-magnetic parameters of the cavity, and different influence levels of these geometry parameters are ranked. In this paper, we will also present how the etching thickness changes the frequency during the buffered chemical polishing processing, and the difference of the change for the two type cavities has been compared.

MOPO049	Electro-Magnetic Optimization of a Quarter-Wave Resonator	206
	C. Zhang, Y. He, S.H. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	The Institute of Modern Physics (IMP) has been trying to design a highly effective accelerating quarter-wave resonator (QWR) cavity which can work at a record high voltage of 2.5 MV with as low as possible peak surface electromagnetic (EM) fields. In the cavity design, we set the goal of the optimization to minimize the peak magnetic and electric fields while still keeping good values for the R over Q and the geometric factor. Take the design of the QWR cavity with frequency of 81.25 MHz and beta of 0.085 for example, from a regular cylindrical shaped inner and outer conductor, the optimization has led them to a conic inner conductor and an elliptic outer conductor. In this paper, we will present how the cavity geometry parameters evolve in order to approach optimal EM design. The optimization also includes the internal drift tube face angle required for beam steering correction.

Paper

Title

Page

Electro-Magnetic Optimization and Analyses of Etching for HIRFL Quarter-Wave Resonators

147

C. Zhang, W. Chang, Y. He, S.H. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

A superconducting accelerating section for SSC-linac system (injector into separated sector cyclotron) is under development at the HIRFL (heavy ion research facility of Lanzhou). Two types of superconducting quarter-wave resonators (81.25 MHz, optimum β = 0.041 and 0.085) will be used for acceleration to energies of up to 10 MeV per nucleon. The β=0.041 QWR works at the accelerating voltage of 0.75 MV and β=0.085 QWR works at 1.5 MV, in order to reach a record high performance, the EM design was carefully optimized for both cavities. A selected number of cavity geometry parameters were analyzed to see how they affect the electro-magnetic parameters of the cavity, and different influence levels of these geometry parameters are ranked. In this paper, we will also present how the etching thickness changes the frequency during the buffered chemical polishing processing, and the difference of the change for the two type cavities has been compared.

MOPO049

Electro-Magnetic Optimization of a Quarter-Wave Resonator

206

C. Zhang, Y. He, S.H. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

The Institute of Modern Physics (IMP) has been trying to design a highly effective accelerating quarter-wave resonator (QWR) cavity which can work at a record high voltage of 2.5 MV with as low as possible peak surface electromagnetic (EM) fields. In the cavity design, we set the goal of the optimization to minimize the peak magnetic and electric fields while still keeping good values for the R over Q and the geometric factor. Take the design of the QWR cavity with frequency of 81.25 MHz and beta of 0.085 for example, from a regular cylindrical shaped inner and outer conductor, the optimization has led them to a conic inner conductor and an elliptic outer conductor. In this paper, we will present how the cavity geometry parameters evolve in order to approach optimal EM design. The optimization also includes the internal drift tube face angle required for beam steering correction.