IPAC2013 - List of Authors (Bai, W.)

Paper	Title	Page
MOPFI036	Study of the Cold Cathode RF Electron Gun Based on Doped Diamond Films at CAEP	366
	X. Li TUB, Beijing, People's Republic of China W. Bai, M. Li CAEP/IAE, Mianyang, Sichuan, People's Republic of China
	Diamond relevant materials have been considered as a promising field emission cathode in recent years. High current density can be obtained either by diamond field emission arrays or by doped diamond films under electrical strengths of several decades of MV/m. Based on the doped films a half cell S-band electron gun has been designed and constructed at CAEP. The gun can provide an accelerating gradient of 60-80 MV/m on the cathode surface (6 mm in diameter). Simulations have proven good performance of such a gun but it needs confirmed by further experiments. Details of the experiments and comparisons with simulations will be reported.

MOPME036	Prototype Experiment Preparation of a 54.167MHz Laser Wire System for FEL-THz Facility at CAEP	550
	D. Wu TUB, Beijing, People's Republic of China W. Bai, M. Li, H. Wang, J. Wang, X. Yang CAEP/IAE, Mianyang, Sichuan, People's Republic of China
	In this paper, a prototype experiment preparation of a 54.167 MHz laser wire system is presented, which will be used to measure the beam size of a CW DC gun built as an electron source of FEL-THz facility in China Academmy of Engineering Physics (CAEP). The rms beam size is less than 1 mm and the average current of the electron beam is more than 1 mA. This new-type LW system ultilizes the excess power other the photocathode drive laser and becomes much cheaper and simpler. Plus, it can distinguish beams with different energies which are very close in ERLs. The system layout and the simulation results are also presented.

TUPWO029	Beam Line Design at the CAEP THz Free Electron Laser	1937
	P. Li, W. Bai, H. Wang CAEP/IAE, Mianyang, Sichuan, People's Republic of China X. Li TUB, Beijing, People's Republic of China
	China Academy of Physics (CAEP) is currently building a THz Free Electron Laser (THz-FEL) which serves as a radiation light sourse used for research in a variety of experimental fields. In this paper, we present the design of the beam line, which was accomplished using PARMELA and TRANSPORT code simulations. The accelerator consists of a 350 kV photocathode DC gun in conjunction with one cryomodule containing two 4-cell superconductiong RF cavities. The energy of the elctron beam is 7~8 MeV, and the maximum of the average beam current is 5 mA. A transverse emittance typically below 10 pi mm.mrad can be achieved.

WEPFI036	R&D on a Main Accelerating Section of a Compact THz-FEL	2780
	W. Bai, M. Li, X. Shen, H. Wang, X. Yang CAEP/IAE, Mianyang, Sichuan, People's Republic of China
	In order to develop a tera-hertz(THz) radiation source and to make scientific researches on application of THz technology, a study on tera-hertz source is performed. The radiation source is based on technology of free electron laser(FEL). The energy booster section of the injector uses a 9 Cell standing wave accelerator as the main accelerator for the FEL. The accelerator works at S band.(2856 MHz), excited by a microwave power of about 3.5 MW. At the end of the accelerator, the high quality beam energy is of 6.5MeV ~ 7 MeV, and the current about 300 mA. This paper presents the newly prgress of the , as well as the working condition of the main accelerator.

WEPFI037	Recent Status of a C-band 2MeV Accelerator	2783
	W. Bai CAEP/IAE, Mianyang, Sichuan, People's Republic of China
	In order to carry out engineering research on miniaturization of accelerator, we performs effort to develop C-band 2MeV standing wave accelerator. At present , the important progress has been achieved on the accelerator development. The accelerating tube has been fully sealed, and the hot test platform of the accelerator has been built. In condition of repetition rate of 200Hz, preliminary power test has been got through. Using ionization chamber dose monitor, we tested the dose rate of X-ray at 1m before the target. And by means of steel absorption method, we tested the energy of the electron beam. The preliminary test results are: beam energy about 2.0MeV, dose rate about 2Gy/min•m.

THPME018	Design of Dipole and Quadrupole for THz-FEL at CAEP	3540
	L.G. Yan, W. Bai, D.R. Deng CAEP/IAE, Mianyang, Sichuan, People's Republic of China
	The high average power terahertz free electronic laser (THz-FEL) is being constructed at CAEP (China Academy of Engineering Physics), which is designed for lasing between 100-300 μm. The magnets of THz-FEL include 3 dipoles and 6 quadrupoles, and their fields and field quality were required by 6-9 MeV operation. This proceeding introduced the design and the main parameters of these magnets. The higher harmonic content of the magnetic field was also analyzed. All the design of magnets achieved the goal.

Paper

Title

Page

Study of the Cold Cathode RF Electron Gun Based on Doped Diamond Films at CAEP

366

X. Li
TUB, Beijing, People's Republic of China
W. Bai, M. Li
CAEP/IAE, Mianyang, Sichuan, People's Republic of China

Diamond relevant materials have been considered as a promising field emission cathode in recent years. High current density can be obtained either by diamond field emission arrays or by doped diamond films under electrical strengths of several decades of MV/m. Based on the doped films a half cell S-band electron gun has been designed and constructed at CAEP. The gun can provide an accelerating gradient of 60-80 MV/m on the cathode surface (6 mm in diameter). Simulations have proven good performance of such a gun but it needs confirmed by further experiments. Details of the experiments and comparisons with simulations will be reported.

MOPME036

Prototype Experiment Preparation of a 54.167MHz Laser Wire System for FEL-THz Facility at CAEP

550

D. Wu
TUB, Beijing, People's Republic of China
W. Bai, M. Li, H. Wang, J. Wang, X. Yang
CAEP/IAE, Mianyang, Sichuan, People's Republic of China

In this paper, a prototype experiment preparation of a 54.167 MHz laser wire system is presented, which will be used to measure the beam size of a CW DC gun built as an electron source of FEL-THz facility in China Academmy of Engineering Physics (CAEP). The rms beam size is less than 1 mm and the average current of the electron beam is more than 1 mA. This new-type LW system ultilizes the excess power other the photocathode drive laser and becomes much cheaper and simpler. Plus, it can distinguish beams with different energies which are very close in ERLs. The system layout and the simulation results are also presented.

TUPWO029

Beam Line Design at the CAEP THz Free Electron Laser

1937

P. Li, W. Bai, H. Wang
CAEP/IAE, Mianyang, Sichuan, People's Republic of China
X. Li
TUB, Beijing, People's Republic of China

China Academy of Physics (CAEP) is currently building a THz Free Electron Laser (THz-FEL) which serves as a radiation light sourse used for research in a variety of experimental fields. In this paper, we present the design of the beam line, which was accomplished using PARMELA and TRANSPORT code simulations. The accelerator consists of a 350 kV photocathode DC gun in conjunction with one cryomodule containing two 4-cell superconductiong RF cavities. The energy of the elctron beam is 7~8 MeV, and the maximum of the average beam current is 5 mA. A transverse emittance typically below 10 pi mm.mrad can be achieved.

WEPFI036

R&D on a Main Accelerating Section of a Compact THz-FEL

2780

W. Bai, M. Li, X. Shen, H. Wang, X. Yang
CAEP/IAE, Mianyang, Sichuan, People's Republic of China

In order to develop a tera-hertz(THz) radiation source and to make scientific researches on application of THz technology, a study on tera-hertz source is performed. The radiation source is based on technology of free electron laser(FEL). The energy booster section of the injector uses a 9 Cell standing wave accelerator as the main accelerator for the FEL. The accelerator works at S band.(2856 MHz), excited by a microwave power of about 3.5 MW. At the end of the accelerator, the high quality beam energy is of 6.5MeV ~ 7 MeV, and the current about 300 mA. This paper presents the newly prgress of the , as well as the working condition of the main accelerator.

WEPFI037

Recent Status of a C-band 2MeV Accelerator

2783

W. Bai
CAEP/IAE, Mianyang, Sichuan, People's Republic of China

In order to carry out engineering research on miniaturization of accelerator, we performs effort to develop C-band 2MeV standing wave accelerator. At present , the important progress has been achieved on the accelerator development. The accelerating tube has been fully sealed, and the hot test platform of the accelerator has been built. In condition of repetition rate of 200Hz, preliminary power test has been got through. Using ionization chamber dose monitor, we tested the dose rate of X-ray at 1m before the target. And by means of steel absorption method, we tested the energy of the electron beam. The preliminary test results are: beam energy about 2.0MeV, dose rate about 2Gy/min•m.

THPME018

Design of Dipole and Quadrupole for THz-FEL at CAEP

3540

L.G. Yan, W. Bai, D.R. Deng
CAEP/IAE, Mianyang, Sichuan, People's Republic of China

The high average power terahertz free electronic laser (THz-FEL) is being constructed at CAEP (China Academy of Engineering Physics), which is designed for lasing between 100-300 μm. The magnets of THz-FEL include 3 dipoles and 6 quadrupoles, and their fields and field quality were required by 6-9 MeV operation. This proceeding introduced the design and the main parameters of these magnets. The higher harmonic content of the magnetic field was also analyzed. All the design of magnets achieved the goal.