IPAC2011 - List of Authors (Park, C.D.)

Paper	Title	Page
TUPS014	Vacuum Performance Simulation of C-band Accelerating Structures	1548
	H. Lee, M.-H. Cho, S.H. Kim, C.H. Yi POSTECH, Pohang, Kyungbuk, Republic of Korea W. Namkung, C.D. Park PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: This work is partly supported by the MEST and POSTECH Physics BK21 program. A C-band accelerating structure has a higher accelerating gradient than that of the S-band structure. It provides a good advantage of a shorter machine length. In order to effectively use RF power and for cost reduction, the accelerating structure should be as long as possible. We propose a 2.2-m long structure compared to 1.8-m at SACLA (SPring-8 Angstrom Compact free electron LAser). However, a longer accelerating structure has worse vacuum performance than a shorter accelerating structure. Thus, the vacuum conductance of 2.2-m long structure has to be checked. We calculate vacuum performance of the accelerating structure by 1-D analytical method and 3-D finite element method (FEM). It is shown that the vacuum performance for the 2.2-m long accelerating structure is safe enough for the XFEL LINAC.

Paper

Title

Page

Vacuum Performance Simulation of C-band Accelerating Structures

1548

H. Lee, M.-H. Cho, S.H. Kim, C.H. Yi
POSTECH, Pohang, Kyungbuk, Republic of Korea
W. Namkung, C.D. Park
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: This work is partly supported by the MEST and POSTECH Physics BK21 program.
A C-band accelerating structure has a higher accelerating gradient than that of the S-band structure. It provides a good advantage of a shorter machine length. In order to effectively use RF power and for cost reduction, the accelerating structure should be as long as possible. We propose a 2.2-m long structure compared to 1.8-m at SACLA (SPring-8 Angstrom Compact free electron LAser). However, a longer accelerating structure has worse vacuum performance than a shorter accelerating structure. Thus, the vacuum conductance of 2.2-m long structure has to be checked. We calculate vacuum performance of the accelerating structure by 1-D analytical method and 3-D finite element method (FEM). It is shown that the vacuum performance for the 2.2-m long accelerating structure is safe enough for the XFEL LINAC.