Cyclotrons2013 - List of Authors (Wei, J.Y.)

Paper	Title	Page
TUPPT026	The Design and Testing of an Automatic RF Conditioning System for the Compact Medical Cyclotron	209
	Y. Lei, B. Ji, P.Z. Li, C. Wang, J.Y. Wei, Z.G. Yin, T.J. Zhang CIAE, Beijing, People's Republic of China
	The multipacting phenomenon for a compact medical cyclotron is induced by the fringing magnet field inside the accelerating structure. And it will become more interesting, when the vacuum system is equipped with diffusion pump. A method used for CYCIAE-14 cavity conditioning is reported together with the testing results of an automatic conditioning circuit designed on such basis. Apart from traditional Low Level RF control, in which close-loop regulation plays an important role, the automatic conditioning system emphasizes on the cavity startup process. It takes advantage of the modern digital signal processing technique, combined with the direct digital synthesizer to accurately limit the reflection, will condition the cavity by means of sweeping frequency, using the low RF driven power, in continuous wave mode. The electronics are designed and tested first; it will be used later in the RF system commissioning of other compact medical cyclotrons built by BRIF division of CIAE.

Paper

Title

Page

The Design and Testing of an Automatic RF Conditioning System for the Compact Medical Cyclotron

209

Y. Lei, B. Ji, P.Z. Li, C. Wang, J.Y. Wei, Z.G. Yin, T.J. Zhang
CIAE, Beijing, People's Republic of China

The multipacting phenomenon for a compact medical cyclotron is induced by the fringing magnet field inside the accelerating structure. And it will become more interesting, when the vacuum system is equipped with diffusion pump. A method used for CYCIAE-14 cavity conditioning is reported together with the testing results of an automatic conditioning circuit designed on such basis. Apart from traditional Low Level RF control, in which close-loop regulation plays an important role, the automatic conditioning system emphasizes on the cavity startup process. It takes advantage of the modern digital signal processing technique, combined with the direct digital synthesizer to accurately limit the reflection, will condition the cavity by means of sweeping frequency, using the low RF driven power, in continuous wave mode. The electronics are designed and tested first; it will be used later in the RF system commissioning of other compact medical cyclotrons built by BRIF division of CIAE.