Hashimoto, Y.

Paper	Title	Page
TUPLT072	Dual Harmonic Acceleration with Broadband MA Cavities in J-PARC RCS	1318
	M. Yamamoto JAERI, Chiba-ken S. Anami, E. Ezura, K. Hara, Y. Hashimoto, C. Ohmori, A. Takagi, M. Yoshii KEK, Ibaraki M. Nomura, A. Schnase, F. Tamura JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	In the J-PARC RCS rf system, since the fundamental rf acceleration voltage and the 2nd higher harmonic one are applied to each cavity, the impedance of hte cavity has a broadband characteristic. The Q-value of the cavity is chosen to make the higher harmonic beam loading effect as small as possible. The analysis of the amplifier and the beam loading effect on the dual harmonic rf system is described.
TUPLT073	Observation of Coupling Resonance in HIMAC Synchrotron	1321
	T. Uesugi, T. Fujisawa, K. Noda, S. Shibuya, D. Tann, H. Uchiyama NIRS, Chiba-shi Y. Hashimoto KEK, Ibaraki I.N. Meshkov, E. Syresin JINR, Dubna, Moscow Region
	Coupling resonance was observed at operating points near to Qx-Qy=1. Two-dimensional profile of a beam at its equilibrium was measured, and it was found that the beam was inclined in transverse when the operating point is near to the resonance condition. We will present the detail of the measurement and the results.
WEOACH01	High Field Gradient Cavity for J-PARC 3 GeV RCS	123
	C. Ohmori, S. Anami, E. Ezura, K. Hara, Y. Hashimoto, A. Takagi, M. Toda, M. Yoshii KEK, Ibaraki M. Nomura, A. Schnase, F. Tamura, M. Yamamoto JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	A new type of rf cavity will be used for J-PARC project. To minimize the beam loading effects, the quality factor of the core stack is increased by a cut core configuration. High power test of the rf system has been performed. Temperature rise around the cut surface of the cores were observed. It is minimized by improving the cooling efficiency.
	Video of talk
	Transparencies