Naruse, T.

Paper	Title	Page
THPLT065	Study of Multiturn Injection at HIMAC Synchrotron	2637
	T.H. Uesugi, T. Furukawa, T. Naruse, K. Noda NIRS, Chiba-shi T. Fujimoto, S. Shibuya AEC, Chiba
	In the multiturn injection method at the HIMAC synchrotron, a collapsing speed of the bump orbit was decreased from 200 to 350 microseconds in order to obtain higher intensity beam. The injection line was readjusted to satisfy the optimum condition of multiturn injection method. Furthermore, COD correction and bump-orbit optimization were carried out. On the other hand, in order to prevent the resonance by tune shift and to keep the beam intensity constant, tune survey was carried out. While vertical tune is adjusted, we propose that the method to reduce beam loss after injection by expanding vertical beam size by means of the RF-knockout. This paper describes the improvement of injection at HIMAC synchrotron.
THOBLH01	Recent Improvement of Slow-extraction at HIMAC Synchrotron	267
	T. Furukawa, T. Furukawa, T.H. Uesugi Chiba University, Graduate School of Science and Technology, Chiba T. Fujimoto, M. Kanazawa, K. Noda, S. Shibuya, E. Takada, S. Yamada NIRS, Chiba-shi T. Naruse Seikei University, Graduate School of Engineering, Tokyo
	At HIMAC synchrotron, two kinds of slow-extraction method have been developed and utilized: third-order resonant slow-extraction and that with RF-knockout, not only for ion therapy but also for physics and biological experiments. Thus, the improvements of the extracted beam quality have also been carried out in both methods. One of the improvements is the global spill control. The global spill is improved owing to analytical approach in both methods. Cooperating with the feedback system, the flat spill is easily obtained without gain control of the feedback during the extraction. On the other hand, the effect of longitudinal motion for the bunched beam was studied to suppress the frequency component of the synchrotron oscillation in the spill ripple. Further, the transport of the extracted beam is readjusted for controlling the beam size. In this paper, recent improvement of slow-extraction at HIMAC is presented.
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