The Monitor System of the 7MeV Proton Linac at ICR

Y. Iwashita, M. Kando, M. Ikegami, H. Dewa, T. Shirai,
S. Kakigi, H. Fujita, A. Noda, and M. Inoue
Accelerator Laboratory Nuclear Science Research Facility,
Institute for Chemical Research, Kyoto University, JAPAN


The beam monitor system at ICR 7MeV proton linac is described. Because of the pulsed beam ( <1% duty ) and the simplicity, fluorescence on a screen plate is observed for the beam profile monitoring. To clear the beam line, the screen can be flipped away by an electromagnetic actuator installed in the vacuum vessel. With this view screen, an emittance monitor is constructed. The beam current can be measured non-destructively by a core monitor. Because the pulse length is rather long (~ 50 Ás), a special pre-amplifier using Negative Impedance Converter is designed. Very thin steering magnet with eight poles is also developed to compensate the deflection of the output beam.
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