SAP2014 - List of Authors (Zhang, T.J.)

Paper	Title	Page
WEPMH1	New Development of the High Power Proton Cyclotrons at CIAE	16
	J.J. Yang, Y.L. Lv, T.J. Zhang CIAE, Beijing, People's Republic of China
	Funding: Supported by National Natural Science Foundation of China(No.11375273) The high power proton beam has wide application potentials in future clean nuclear energy system, neutron physics study, RIB production and particle physics research. Cyclotrons are intrinsic in continuous-wave beam mode, which has the characteristics of high efficient power conversion rate, compact structure and relatively low construction cost. CIAE is dedicated to developing high power proton cyclotron in China for a long time. In this talk, the recent construction progress of the 100MeV cyclotron will be presented in detail. The commissioning of this cyclotron is in progress and we got the first beam on July 4, 2014. In additions, this talk also introduces the progress of the pre-study of a high power 800 MeV separate-sector ring cyclotron, which is proposed to provide high power proton beam for applications neutron and neutrino physics, proton radiography and nuclear data measurement.

WEPH16	The Simulation of Stripping Extraction Process for CYCIAE-100	62
	Shizhong. An, F.P. Guan, M. Li, S.M. Wei, J.J. Yang, T.J. Zhang CIAE, Beijing, People's Republic of China
	A 100 MeV H⁻ compact cyclotron is under construction at China Institute of Atomic Energy (CYCIAE-100). The proton beams of 75 MeV - 100 MeV at an intensity of 200 μA will be extracted in dual opposite directions by charge exchange stripping devices. The two main parameters for the stripping extraction are the positions of stripping foil and combination magnet. For CYCIAE-100, the center of combination magnet is fixed at (R=2.75 m, θ=100°) and the extracted radii decide the positions of stripping foil for different extracted energies. In order to analyze the extracted proton beam parameters, the stripping extraction process for CYCIAE-100 is simulated in detail in this paper. The simulation is mainly done for the different RF acceptance or acceleration phase width. The simulation results indicate that the energy spreads of the extracted beams under different initial phase width conditions are almost the same. The transverse beam distribution and the extracted beam profile are not affected by the initial phase width due to the simulation, that's the characters of the cyclotron with the stripping extraction mode.

WEPH26	Applying the None-stationary Theory to the Multipacting Analysis of a Cyclotron RF Cavity	74
	C. Wang, B. Ji, Z.G. Yin, T.J. Zhang, Z.L. Zhao CIAE, Beijing, People's Republic of China
	The most of the available multipacting theories are based on assumptions on the emission velocities of secondary electrons and restrict the electron-surface impact pattern to double surface impacts. And these theories can only predict the multipacting conditions in the form of Hatch diagram, which is a formularization of RF voltage vs. frequency multiplied by gap distance, and have very little information on the dynamics of multipacting processes. However, the None-stationary multipacting theory introduced by S. Anza *, uses more physical statistic way to dealing with the emission velocities of secondary electrons and have no restrict on the electron-surface impact pattern. In this paper we first extend the None-stationary multipacting theory. And then, we have made a careful analysis on the dynamics of a multipacting process observed during RF conditioning of a cyclotron, by using the none-stationary theory. This analysis gives us an inspiration to both figure out the problem and develop a cure to it.

Paper

Title

Page

New Development of the High Power Proton Cyclotrons at CIAE

16

J.J. Yang, Y.L. Lv, T.J. Zhang
CIAE, Beijing, People's Republic of China

Funding: Supported by National Natural Science Foundation of China(No.11375273)
The high power proton beam has wide application potentials in future clean nuclear energy system, neutron physics study, RIB production and particle physics research. Cyclotrons are intrinsic in continuous-wave beam mode, which has the characteristics of high efficient power conversion rate, compact structure and relatively low construction cost. CIAE is dedicated to developing high power proton cyclotron in China for a long time. In this talk, the recent construction progress of the 100MeV cyclotron will be presented in detail. The commissioning of this cyclotron is in progress and we got the first beam on July 4, 2014. In additions, this talk also introduces the progress of the pre-study of a high power 800 MeV separate-sector ring cyclotron, which is proposed to provide high power proton beam for applications neutron and neutrino physics, proton radiography and nuclear data measurement.

WEPH16

The Simulation of Stripping Extraction Process for CYCIAE-100

62

Shizhong. An, F.P. Guan, M. Li, S.M. Wei, J.J. Yang, T.J. Zhang
CIAE, Beijing, People's Republic of China

A 100 MeV H⁻ compact cyclotron is under construction at China Institute of Atomic Energy (CYCIAE-100). The proton beams of 75 MeV - 100 MeV at an intensity of 200 μA will be extracted in dual opposite directions by charge exchange stripping devices. The two main parameters for the stripping extraction are the positions of stripping foil and combination magnet. For CYCIAE-100, the center of combination magnet is fixed at (R=2.75 m, θ=100°) and the extracted radii decide the positions of stripping foil for different extracted energies. In order to analyze the extracted proton beam parameters, the stripping extraction process for CYCIAE-100 is simulated in detail in this paper. The simulation is mainly done for the different RF acceptance or acceleration phase width. The simulation results indicate that the energy spreads of the extracted beams under different initial phase width conditions are almost the same. The transverse beam distribution and the extracted beam profile are not affected by the initial phase width due to the simulation, that's the characters of the cyclotron with the stripping extraction mode.

WEPH26

Applying the None-stationary Theory to the Multipacting Analysis of a Cyclotron RF Cavity

74

C. Wang, B. Ji, Z.G. Yin, T.J. Zhang, Z.L. Zhao
CIAE, Beijing, People's Republic of China

The most of the available multipacting theories are based on assumptions on the emission velocities of secondary electrons and restrict the electron-surface impact pattern to double surface impacts. And these theories can only predict the multipacting conditions in the form of Hatch diagram, which is a formularization of RF voltage vs. frequency multiplied by gap distance, and have very little information on the dynamics of multipacting processes. However, the None-stationary multipacting theory introduced by S. Anza *, uses more physical statistic way to dealing with the emission velocities of secondary electrons and have no restrict on the electron-surface impact pattern. In this paper we first extend the None-stationary multipacting theory. And then, we have made a careful analysis on the dynamics of a multipacting process observed during RF conditioning of a cyclotron, by using the none-stationary theory. This analysis gives us an inspiration to both figure out the problem and develop a cure to it.