CYCLOTRONS 2010 - List of Authors (Fei, K.)

Paper	Title	Page
MOPCP064	Amplifier Test Stand for the CRM Cyclotron	177
	Z.G. Yin, K. Fei, B. Ji, P.Z. Li, G.S. Liu, G.F. Song, T.J. Zhang CIAE, Beijing, People's Republic of China C.J. Yu CASIC, Beijing, People's Republic of China
	Abstract: The final stage amplifier stability proves to be an important issue in the process of commissioning CRM cyclotron at CIAE. An air cooled 4CX15,000 tube final stage has been designed to evaluate the anode circuit and neutralization, both of which are weak points of the CRM cyclotron amplifier. Instead of strip line, the design of the new anode structure adopts coaxial form, resulting in less chance of parasitic resonance in the circuits. A tunable neutralization circuits is also included in the design, giving an opportunity to better stability in high power operations. First, the instability in CRM RF system will be analyzed in this paper followed with the new amplifier designs including the tube working line calculations, input/output circuit calculations and finite integral simulations. The mechanical design for tube socket and the anode tank have been successfully carried out using the data provided in this paper. The final stage amplifier is then fabricated, assembled and commissioned. In the power test with dummy load, more than 9.2kW RF fundamental power is provided at the frequency of 44MHz.

Paper

Title

Page

Amplifier Test Stand for the CRM Cyclotron

177

Z.G. Yin, K. Fei, B. Ji, P.Z. Li, G.S. Liu, G.F. Song, T.J. Zhang
CIAE, Beijing, People's Republic of China
C.J. Yu
CASIC, Beijing, People's Republic of China

Abstract: The final stage amplifier stability proves to be an important issue in the process of commissioning CRM cyclotron at CIAE. An air cooled 4CX15,000 tube final stage has been designed to evaluate the anode circuit and neutralization, both of which are weak points of the CRM cyclotron amplifier. Instead of strip line, the design of the new anode structure adopts coaxial form, resulting in less chance of parasitic resonance in the circuits. A tunable neutralization circuits is also included in the design, giving an opportunity to better stability in high power operations. First, the instability in CRM RF system will be analyzed in this paper followed with the new amplifier designs including the tube working line calculations, input/output circuit calculations and finite integral simulations. The mechanical design for tube socket and the anode tank have been successfully carried out using the data provided in this paper. The final stage amplifier is then fabricated, assembled and commissioned. In the power test with dummy load, more than 9.2kW RF fundamental power is provided at the frequency of 44MHz.