SRF2011 - List of Authors (Zhang, C.)

Paper

Title

Page

Chinese Plan for ADS and CSNS

977

S. Fu, H. Chen, Y.L. Chi, S.X. Fang, L. Ma, W.M. Pan, J.Y. Tang, C. Zhang
IHEP Beijing, Beijing, People's Republic of China
Y. He, H.W. Zhao
IMP, Lanzhou, People's Republic of China

High intensity proton accelerator now has two major applications in China: one is Accelerator Driven Subcritical System for nuclear waste transmutation and another is spallation neutron source. A basic research program on ADS started in 2000 in China. Recently a Chinese roadmap for long-term development of ADS was proposed by Chinese Academy of Sciences and the first budget of about $260M has be approved for ADS key technology R&D. It includes a CW proton linac consisting of a room-temperature RFQ and superconducting spoke cavities. The ADS R&D program started in the first half of 2011. The almost same amount of budget has also been approved for the project of China Spallation Neutron Source(CSNS) and it is going to be launched in September 2011. CSNS accelerator consists of a room-temperature H⁻ linac and a rapid-cycling synchrotron with beam power of 100kW. It will be upgraded to 500kW beam power in future by adding some superconducting cavities to the linac. So superconducting RF accelerator technology becomes a major research direction in high intensity proton accelerator field in China. This paper will introduce these two programs and present the related R&D actives.

Slides FRIOB03 [4.072 MB]

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
FRIOB03	Chinese Plan for ADS and CSNS	977
	S. Fu, H. Chen, Y.L. Chi, S.X. Fang, L. Ma, W.M. Pan, J.Y. Tang, C. Zhang IHEP Beijing, Beijing, People's Republic of China Y. He, H.W. Zhao IMP, Lanzhou, People's Republic of China
	High intensity proton accelerator now has two major applications in China: one is Accelerator Driven Subcritical System for nuclear waste transmutation and another is spallation neutron source. A basic research program on ADS started in 2000 in China. Recently a Chinese roadmap for long-term development of ADS was proposed by Chinese Academy of Sciences and the first budget of about $260M has be approved for ADS key technology R&D. It includes a CW proton linac consisting of a room-temperature RFQ and superconducting spoke cavities. The ADS R&D program started in the first half of 2011. The almost same amount of budget has also been approved for the project of China Spallation Neutron Source(CSNS) and it is going to be launched in September 2011. CSNS accelerator consists of a room-temperature H⁻ linac and a rapid-cycling synchrotron with beam power of 100kW. It will be upgraded to 500kW beam power in future by adding some superconducting cavities to the linac. So superconducting RF accelerator technology becomes a major research direction in high intensity proton accelerator field in China. This paper will introduce these two programs and present the related R&D actives.
	Slides FRIOB03 [4.072 MB]

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.