CYCLOTRONS 2010 - List of Keywords (feedback)

Paper	Title	Other Keywords	Page
MOPCP021	Automated Operation and Optimization of the VARIAN 250 MeV Superconducting Compact Proton Cyclotron	cyclotron, extraction, controls, proton	93
	T. Stephani, U. Behrens, H. Röcken VMS-PT, Bergisch Gladbach, Germany C. Baumgarten PSI, Villigen, Switzerland
	The 250 MeV superconducting compact proton cyclotron of Varian Medical Systems Particle Therapy (the former ACCEL) is specially designed for the use in proton therapy systems. During medical operation typically no operator is required. Furthermore, several automated control system procedures guarantee a fast, simple, and reliable startup and beam optimization after overnight shutdown or regular service actions. We report on the automated startup procedures, automated beam centering, and automated optimization of extraction efficiency. Furthermore we present an automated beam current setting as used during medical operation by means of an electrostatic deflector located at the cyclotron center at low beam energies.

MOPCP064	Amplifier Test Stand for the CRM Cyclotron	cyclotron, resonance, impedance, simulation	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

Other Keywords

Page

MOPCP021

Automated Operation and Optimization of the VARIAN 250 MeV Superconducting Compact Proton Cyclotron

cyclotron, extraction, controls, proton

93

T. Stephani, U. Behrens, H. Röcken
VMS-PT, Bergisch Gladbach, Germany
C. Baumgarten
PSI, Villigen, Switzerland

The 250 MeV superconducting compact proton cyclotron of Varian Medical Systems Particle Therapy (the former ACCEL) is specially designed for the use in proton therapy systems. During medical operation typically no operator is required. Furthermore, several automated control system procedures guarantee a fast, simple, and reliable startup and beam optimization after overnight shutdown or regular service actions. We report on the automated startup procedures, automated beam centering, and automated optimization of extraction efficiency. Furthermore we present an automated beam current setting as used during medical operation by means of an electrostatic deflector located at the cyclotron center at low beam energies.

MOPCP064

Amplifier Test Stand for the CRM Cyclotron

cyclotron, resonance, impedance, simulation

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.