IPAC2013 - List of Authors (Shang, L.)

Paper	Title	Page
MOPWA013	The New Injection System of the HLS II	687
	L. Shang, Y. Lu, F. Shang, Y.Y. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: The program is funded by NSFC with No. 10875116 and No. 11175181 The 0.8GeV storege ring is being rebuilt in NSRL. The design and construction of the new injection system of the new ring is presented. Kicker magnet, septum magnet and their pulsed power suplies are described. Test results are given. The ceramic chambers, vacuum tank of the septum magnet, system timing and local pulsed power control are also described. The installation and testing of the new system undergoing.

WEPWA023	Design of 14 MeV LINAC for THz Source Based FEL	2181
	Y.J. Pei, G. Feng, Y. Hong, G. Huang, D. Jia, K. Jin, C. Li, J. Li, S. Lu, L. Shang USTC/NSRL, Hefei, Anhui, People's Republic of China Q.S. Chen, M. Fan, T. Hu, Y.Q. Xiong, H. Zeng HUST, Wuhan, People's Republic of China B. Qing, Z.X. Tang, X.L. Wei USTC, Hefei, Anhui, People's Republic of China L.G. Shen, F. Zhang USTC/PMPI, Hefei, Anhui, People's Republic of China
	Abstract THz wave have many special performances, such as it can penetrate deep into many organic materials without the damage associated with ionizing radiation such as X-ray, it can be used to distinguish between materials with varying water content, because THz radiation is absorbed by water. In part researchers lacked reliable sources of THz, so develop new THz sources is important now. So far there were many kind of THz Source, one of them is THz source based a FEL that can produce high power (~kW). This paper will describe the design of a LINAC of 14MeV which is used for FEL to produce THz radiation. The LINAC is mainly composed of a novel EC-ITC RF gun, compensation coil, constant gradient accelerating structure, beam diagnostic system and so on. Main design parameters are as following: Energy 7~15MeV Beam current (macro pulse) 571mA (micro pulse) 30~40° Bunch length 5~7ps Charge per bunch 200~300pC Normalized emittance ≤10mm.mrad Energy spread(rms) ≤0.5%

WEPWA024	Study of an Electron Gun for Terahertz Radiation Source	2184
	J. Li, C. Li, Y.J. Pei, L. Shang USTC/NSRL, Hefei, Anhui, People's Republic of China Q.S. Chen, T. Hu HUST, Wuhan, People's Republic of China G. Feng DESY, Hamburg, Germany
	With the aim to obtain short-pulse bunches with high peak current for a terahertz radiation source, an RF gun with independently tunable cells (ITC) was employed. As the electron source of the ITC RF gun, a grid-control DC gun plays a key role, the performance of which determines the beam quality in the injector and transport line. In order to make the beam well compressed in the ITC RF gun, the energy of the electrons acquired from the grid-control DC gun should be 15 KeV at most. A proper structure of the grid-gun is shown to overcome the strong space charge force on the cathode, which is able to generate 1us beam with 4.5A current successfully. Simulations considering the grid net are also introduced.

Paper

Title

Page

The New Injection System of the HLS II

687

L. Shang, Y. Lu, F. Shang, Y.Y. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: The program is funded by NSFC with No. 10875116 and No. 11175181
The 0.8GeV storege ring is being rebuilt in NSRL. The design and construction of the new injection system of the new ring is presented. Kicker magnet, septum magnet and their pulsed power suplies are described. Test results are given. The ceramic chambers, vacuum tank of the septum magnet, system timing and local pulsed power control are also described. The installation and testing of the new system undergoing.

WEPWA023

Design of 14 MeV LINAC for THz Source Based FEL

2181

Y.J. Pei, G. Feng, Y. Hong, G. Huang, D. Jia, K. Jin, C. Li, J. Li, S. Lu, L. Shang
USTC/NSRL, Hefei, Anhui, People's Republic of China
Q.S. Chen, M. Fan, T. Hu, Y.Q. Xiong, H. Zeng
HUST, Wuhan, People's Republic of China
B. Qing, Z.X. Tang, X.L. Wei
USTC, Hefei, Anhui, People's Republic of China
L.G. Shen, F. Zhang
USTC/PMPI, Hefei, Anhui, People's Republic of China

Abstract THz wave have many special performances, such as it can penetrate deep into many organic materials without the damage associated with ionizing radiation such as X-ray, it can be used to distinguish between materials with varying water content, because THz radiation is absorbed by water. In part researchers lacked reliable sources of THz, so develop new THz sources is important now. So far there were many kind of THz Source, one of them is THz source based a FEL that can produce high power (~kW). This paper will describe the design of a LINAC of 14MeV which is used for FEL to produce THz radiation. The LINAC is mainly composed of a novel EC-ITC RF gun, compensation coil, constant gradient accelerating structure, beam diagnostic system and so on. Main design parameters are as following: Energy 7~15MeV Beam current (macro pulse) 571mA (micro pulse) 30~40° Bunch length 5~7ps Charge per bunch 200~300pC Normalized emittance ≤10mm.mrad Energy spread(rms) ≤0.5%

WEPWA024

Study of an Electron Gun for Terahertz Radiation Source

2184

J. Li, C. Li, Y.J. Pei, L. Shang
USTC/NSRL, Hefei, Anhui, People's Republic of China
Q.S. Chen, T. Hu
HUST, Wuhan, People's Republic of China
G. Feng
DESY, Hamburg, Germany

With the aim to obtain short-pulse bunches with high peak current for a terahertz radiation source, an RF gun with independently tunable cells (ITC) was employed. As the electron source of the ITC RF gun, a grid-control DC gun plays a key role, the performance of which determines the beam quality in the injector and transport line. In order to make the beam well compressed in the ITC RF gun, the energy of the electrons acquired from the grid-control DC gun should be 15 KeV at most. A proper structure of the grid-gun is shown to overcome the strong space charge force on the cathode, which is able to generate 1us beam with 4.5A current successfully. Simulations considering the grid net are also introduced.