IPAC2012 - List of Authors (Fuwa, Y.)

Paper	Title	Page
THPPC055	Permanent Magnet Focusing System for Klystrons	3413
	Y. Fuwa, Y. Iwashita, H. Tongu, S. Ushijima Kyoto ICR, Uji, Kyoto, Japan S. Fukuda KEK, Ibaraki, Japan
	The Distributed RF System (DRFS) for ILC requires thousands of klystrons. The failure rate of the power supply for solenoid focusing coil of each klystron may be harmful to a regular operation of the ILC. In order to eliminate the power supplies and the cooling system for the coils, a permanent magnet beam focusing system is under development. It will help to reduce the power consumption as well. In our design, a unidirectional magnetic field configuration is adopted to eliminate the stop bands that arise from the periodic permanent magnet configuration. Since the required magnetic field is not high in this case, inexpensive anisotropic ferrite magnets can be used instead of magnets containing rare earth materials. On the basis of a half scaled model fabricated to evaluate the mechanical design, a full scaled model will be ready soon. In order to prove its feasibility, a power test of the klystron for DRFS with this magnet system is planned. The result of magnetic field distribution measurement and the power test will be presented.

Paper

Title

Page

Permanent Magnet Focusing System for Klystrons

3413

Y. Fuwa, Y. Iwashita, H. Tongu, S. Ushijima
Kyoto ICR, Uji, Kyoto, Japan
S. Fukuda
KEK, Ibaraki, Japan

The Distributed RF System (DRFS) for ILC requires thousands of klystrons. The failure rate of the power supply for solenoid focusing coil of each klystron may be harmful to a regular operation of the ILC. In order to eliminate the power supplies and the cooling system for the coils, a permanent magnet beam focusing system is under development. It will help to reduce the power consumption as well. In our design, a unidirectional magnetic field configuration is adopted to eliminate the stop bands that arise from the periodic permanent magnet configuration. Since the required magnetic field is not high in this case, inexpensive anisotropic ferrite magnets can be used instead of magnets containing rare earth materials. On the basis of a half scaled model fabricated to evaluate the mechanical design, a full scaled model will be ready soon. In order to prove its feasibility, a power test of the klystron for DRFS with this magnet system is planned. The result of magnetic field distribution measurement and the power test will be presented.