CYCLOTRONS 2010 - List of Authors (Tsutsui, H.)

Paper

Title

Page

Induction Sector Cyclotron for Cluster Ions

314

K. Takayama, T. Adachi
KEK, Ibaraki, Japan
W. Jiang
Nagaoka University of Technology, Nagaoka, Niigata, Japan
Y. Oguri
TIT, Tokyo, Japan
H. Tsutsui
SHI, Tokyo, Japan

Funding: supported by Grant-in-Aid for Exploratory Research (KAKENHI 22265403)
A novel scheme of a sector cyclotron to accelerate extremely heavy cluster ions, called 'Induction Sector Cyclotron (ISC)', is described [1]. Its key feature is fast induction acceleration, which has been already demonstrated using the KEK 12 GeV proton synchrotron [2]. An ion bunch is accelerated and captured with pulse voltages generated by transformers. The acceleration and confinement in the longitudinal direction can be independently handled. The transformers are energized by the corresponding switching power supply, in which power solid-state devices are employed as switching elements and their turning on/off is maneuvered by gate signals digitally manipulated from the circulating beam signal of an ion bunch. Consequently the acceleration synchronizing with the revolution of any ion beam is always guaranteed. A cluster ion beam such as C-60, which so far there has been no way to repeatedly accelerate, can be accelerated from an extremely low velocity to a nearly light velocity. Its fundamental concept, beam dynamics, required key devices, and life time of a cluster ion beam will be discussed. A typical example of ISC is proposed at the conference.
[1] K.Takayama et al., submitted to Phys. Rev. Lett. (2010).
[2] K.Takayama et al., Phys. Rev. Lett. 98, 054801 (2007),
K.Takayama and R.Briggs (Eds.), 'Induction Accelerators' (Springer, 2010).

Slides TUA2CCO02 [1.781 MB]

FRM2CCO04

BNCT System Using 30 MeV H⁻ Cyclotron

430

T. Mitsumoto, K. Fujita, T. Ogasawara, H. Tsutsui, S. Yajima
SHI, Tokyo, Japan
A. Maruhashi, Y. Sakurai, H. Tanaka
KURRI, Osaka, Japan

Kyoto University and Sumitomo Heavy Industries, Ltd. have developed an accelerator-based neutron source for Boron Neutron Capture Therapy (BNCT) at the Kyoto University Research Reactor Institute (KURRI). In order to obtain 10⁹ n/cm²/sec epithermal neutron for cancer treatment, a newly designed 30 MeV H⁻ AVF cyclotron named HM-30 was constructed and is being operated. With newly developed spiral inflector, the beam current in the central region can exceed 2 mA. The cyclotron is operated stably at 1 mA owing to the limit of the facility. Extracted proton beam is expanded by two scanner magnets in order to moderate heat concentration on the beryllium target, which is directly cooled by water to endure 30 kW heat load. Mainly fast neutrons are emitted from the target, and moderated to epithermal region by a moderator which consists of lead, iron, polyethylene, etc. Thermal neutron flux in a water phantom is measured by gold wire, which is consistent with the calculation using MCNPX. Preclinical studies have been continued with 10B-p-Borono- phenylalanine.

Slides FRM2CCO04 [1.818 MB]

Paper	Title	Page
TUA2CCO02	Induction Sector Cyclotron for Cluster Ions	314
	K. Takayama, T. Adachi KEK, Ibaraki, Japan W. Jiang Nagaoka University of Technology, Nagaoka, Niigata, Japan Y. Oguri TIT, Tokyo, Japan H. Tsutsui SHI, Tokyo, Japan
	Funding: supported by Grant-in-Aid for Exploratory Research (KAKENHI 22265403) A novel scheme of a sector cyclotron to accelerate extremely heavy cluster ions, called 'Induction Sector Cyclotron (ISC)', is described [1]. Its key feature is fast induction acceleration, which has been already demonstrated using the KEK 12 GeV proton synchrotron [2]. An ion bunch is accelerated and captured with pulse voltages generated by transformers. The acceleration and confinement in the longitudinal direction can be independently handled. The transformers are energized by the corresponding switching power supply, in which power solid-state devices are employed as switching elements and their turning on/off is maneuvered by gate signals digitally manipulated from the circulating beam signal of an ion bunch. Consequently the acceleration synchronizing with the revolution of any ion beam is always guaranteed. A cluster ion beam such as C-60, which so far there has been no way to repeatedly accelerate, can be accelerated from an extremely low velocity to a nearly light velocity. Its fundamental concept, beam dynamics, required key devices, and life time of a cluster ion beam will be discussed. A typical example of ISC is proposed at the conference. [1] K.Takayama et al., submitted to Phys. Rev. Lett. (2010). [2] K.Takayama et al., Phys. Rev. Lett. 98, 054801 (2007), K.Takayama and R.Briggs (Eds.), 'Induction Accelerators' (Springer, 2010).
	Slides TUA2CCO02 [1.781 MB]

FRM2CCO04	BNCT System Using 30 MeV H⁻ Cyclotron	430
	T. Mitsumoto, K. Fujita, T. Ogasawara, H. Tsutsui, S. Yajima SHI, Tokyo, Japan A. Maruhashi, Y. Sakurai, H. Tanaka KURRI, Osaka, Japan
	Kyoto University and Sumitomo Heavy Industries, Ltd. have developed an accelerator-based neutron source for Boron Neutron Capture Therapy (BNCT) at the Kyoto University Research Reactor Institute (KURRI). In order to obtain 10⁹ n/cm²/sec epithermal neutron for cancer treatment, a newly designed 30 MeV H⁻ AVF cyclotron named HM-30 was constructed and is being operated. With newly developed spiral inflector, the beam current in the central region can exceed 2 mA. The cyclotron is operated stably at 1 mA owing to the limit of the facility. Extracted proton beam is expanded by two scanner magnets in order to moderate heat concentration on the beryllium target, which is directly cooled by water to endure 30 kW heat load. Mainly fast neutrons are emitted from the target, and moderated to epithermal region by a moderator which consists of lead, iron, polyethylene, etc. Thermal neutron flux in a water phantom is measured by gold wire, which is consistent with the calculation using MCNPX. Preclinical studies have been continued with 10B-p-Borono- phenylalanine.
	Slides FRM2CCO04 [1.818 MB]