HIAT2015 - List of Authors (Fukuda, M.)

Paper	Title	Page
MOA2C01	Design of a Sector Magnet for High Temperature Superconducting Injector Cyclotron	27
	K. Kamakura, M. Fukuda, K. Hatanaka, S. Morinobu, K. Nagayama, T. Saito, K. Shimada, H. Tamura, H. Ueda, Y. Yasuda, T. Yorita RCNP, Osaka, Japan
	We propose a separated sector cyclotron (SSC) using high temperature superconducting (HTS) magnet for a next generation cyclotron. From its stability and low operating cost, HTS cyclotrons are expected to apply for accelerator-driven subcritical reactors or beam cancer treatment systems. On the other hand, we still have a variety of issues and challenges to implement them. As a first step, we are planning to develop an HTS cyclotron as an injector for K400 ring cyclotron at RCNP. It will be the first attempt in the world. This plan will improve beam intensity in our facility and also contribute to component developments for the next generation cyclotron. The most serious issues are development of large-size HTS magnets that can be used in SSC. One-meter-size HTS dipole magnet is made for testing. Now we are going to exam the magnet and evaluate the characteristics of large HTS magnets. The result of the test will be incorporated with the sector magnet design. Moreover, we have been working on conceptual design of the new injector, developed magnetic field and orbit analysis programs. In this session, the current status of designing HTS injector cyclotron at RCNP will be discussed.
	Slides MOA2C01 [8.164 MB]
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MOPA11	Phase Bunching in the Central Region of the JAEA AVF Cyclotron for Heavy-Ion Acceleration in the Third-Harmonic Mode	62
	N. Miyawaki, H. Kashiwagi, S. Kurashima, S. Okumura JAEA/TARRI, Gunma-ken, Japan M. Fukuda RCNP, Osaka, Japan
	Phase bunching using a rising slope of a dee-voltage at the first acceleration gap was evaluated by analysis of a simplified geometric trajectory analysis model and the measurement of the internal beam phase distribution for the acceleration harmonic number (h) 3 to accelerate the heavy ion in the JAEA AVF cyclotron. The calculated correlation between the internal beam phase and the initial beam phase by the model was consistent with the measurement result of the beam phase distributions with the initial beam phase, defined by adjusting the relative RF phase of the beam buncher. The measured correlation indicated that the initial beam phase width larger than 60 RF degrees was compressed to less than 15 RF degrees, and the internal beam phase was independent of the initial beam phase. The phase bunching effect was almost equal to that for h = 2 with different geometric electrode from h = 3 in the central region.
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MOPA13	Improvement of Mass-to-Charge Ratio Resolution of the JAEA AVF Cyclotron Using a Beam Chopping System	68
	S. Kurashima, H. Kashiwagi, N. Miyawaki JAEA/TARRI, Gunma-ken, Japan M. Fukuda RCNP, Osaka, Japan
	A mass-to-charge ratio (M/Q) resolution of the JAEA cyclotron (K110) is about 3,300 and this high-resolution enables us to quickly change the ion species to be accelerated by a cocktail beam acceleration technique. In this technique, a few ion species having almost the same M/Q are injected into the cyclotron, and the ion species whose cyclotron frequency is completely matches the acceleration frequency is extracted from the cyclotron. The ion species extracted from the cyclotron can be changed by adjusting the acceleration frequency corresponding to the M/Q difference. To improve the M/Q resolution, a new technique is being developed by combining the cocktail beam acceleration and beam chopping techniques. The beam chopping system consists of a pre-beam kicker installed in the beam injection line and a post-beam kicker downstream of the cyclotron. The chopping system is able to pick up beam bunches arbitrarily from a pulse train of an ion beam. At present, we have succeeded to separate the 250 MeV 40Ar¹⁰⁺ beam from the 225 MeV 36Ar⁹⁺, and the M/Q resolution was significantly improved from 3,300 to 25,000 by this new method.
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WEPB27	Developments of LEBT and Injection Systems for Cyclotrons at RCNP	256
	T. Yorita, M. Fukuda, K. Hatanaka, K. Kamakura, S. Morinobu, T. Saito, K. Shimada, H. Tamura, H. Ueda, Y. Yasuda RCNP, Osaka, Japan
	Developments of injection systems for cyclotrons at Research Center for Nuclear Physics (RCNP) Osaka University have been carried recently in order to improve the highly intense heavy ions in MeV region for the secondary RI beam, et al. The additional glazer lens on axial injection of AVF cyclotron is one of those and it has been installed for the purpose of increasing beam transmission to the inflector in center region of cyclotron. Another development is additional buncher for the heavy ion injection like Xe beam which requires high voltage in comparison with proton case. Extension of baffle slits on injection line of Ring Cyclotron also has been done to extend the flexibility of injection orbit. Modification of low energy beam transport (LEBT) from 18GHz Superconducting ECR ion source to AVF injection axis also has been carried.
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Paper

Title

Page

Design of a Sector Magnet for High Temperature Superconducting Injector Cyclotron

27

K. Kamakura, M. Fukuda, K. Hatanaka, S. Morinobu, K. Nagayama, T. Saito, K. Shimada, H. Tamura, H. Ueda, Y. Yasuda, T. Yorita
RCNP, Osaka, Japan

We propose a separated sector cyclotron (SSC) using high temperature superconducting (HTS) magnet for a next generation cyclotron. From its stability and low operating cost, HTS cyclotrons are expected to apply for accelerator-driven subcritical reactors or beam cancer treatment systems. On the other hand, we still have a variety of issues and challenges to implement them. As a first step, we are planning to develop an HTS cyclotron as an injector for K400 ring cyclotron at RCNP. It will be the first attempt in the world. This plan will improve beam intensity in our facility and also contribute to component developments for the next generation cyclotron. The most serious issues are development of large-size HTS magnets that can be used in SSC. One-meter-size HTS dipole magnet is made for testing. Now we are going to exam the magnet and evaluate the characteristics of large HTS magnets. The result of the test will be incorporated with the sector magnet design. Moreover, we have been working on conceptual design of the new injector, developed magnetic field and orbit analysis programs. In this session, the current status of designing HTS injector cyclotron at RCNP will be discussed.

Slides MOA2C01 [8.164 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

MOPA11

Phase Bunching in the Central Region of the JAEA AVF Cyclotron for Heavy-Ion Acceleration in the Third-Harmonic Mode

62

N. Miyawaki, H. Kashiwagi, S. Kurashima, S. Okumura
JAEA/TARRI, Gunma-ken, Japan
M. Fukuda
RCNP, Osaka, Japan

Phase bunching using a rising slope of a dee-voltage at the first acceleration gap was evaluated by analysis of a simplified geometric trajectory analysis model and the measurement of the internal beam phase distribution for the acceleration harmonic number (h) 3 to accelerate the heavy ion in the JAEA AVF cyclotron. The calculated correlation between the internal beam phase and the initial beam phase by the model was consistent with the measurement result of the beam phase distributions with the initial beam phase, defined by adjusting the relative RF phase of the beam buncher. The measured correlation indicated that the initial beam phase width larger than 60 RF degrees was compressed to less than 15 RF degrees, and the internal beam phase was independent of the initial beam phase. The phase bunching effect was almost equal to that for h = 2 with different geometric electrode from h = 3 in the central region.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

MOPA13

Improvement of Mass-to-Charge Ratio Resolution of the JAEA AVF Cyclotron Using a Beam Chopping System

68

S. Kurashima, H. Kashiwagi, N. Miyawaki
JAEA/TARRI, Gunma-ken, Japan
M. Fukuda
RCNP, Osaka, Japan

A mass-to-charge ratio (M/Q) resolution of the JAEA cyclotron (K110) is about 3,300 and this high-resolution enables us to quickly change the ion species to be accelerated by a cocktail beam acceleration technique. In this technique, a few ion species having almost the same M/Q are injected into the cyclotron, and the ion species whose cyclotron frequency is completely matches the acceleration frequency is extracted from the cyclotron. The ion species extracted from the cyclotron can be changed by adjusting the acceleration frequency corresponding to the M/Q difference. To improve the M/Q resolution, a new technique is being developed by combining the cocktail beam acceleration and beam chopping techniques. The beam chopping system consists of a pre-beam kicker installed in the beam injection line and a post-beam kicker downstream of the cyclotron. The chopping system is able to pick up beam bunches arbitrarily from a pulse train of an ion beam. At present, we have succeeded to separate the 250 MeV 40Ar¹⁰⁺ beam from the 225 MeV 36Ar⁹⁺, and the M/Q resolution was significantly improved from 3,300 to 25,000 by this new method.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

WEPB27

Developments of LEBT and Injection Systems for Cyclotrons at RCNP

256

T. Yorita, M. Fukuda, K. Hatanaka, K. Kamakura, S. Morinobu, T. Saito, K. Shimada, H. Tamura, H. Ueda, Y. Yasuda
RCNP, Osaka, Japan

Developments of injection systems for cyclotrons at Research Center for Nuclear Physics (RCNP) Osaka University have been carried recently in order to improve the highly intense heavy ions in MeV region for the secondary RI beam, et al. The additional glazer lens on axial injection of AVF cyclotron is one of those and it has been installed for the purpose of increasing beam transmission to the inflector in center region of cyclotron. Another development is additional buncher for the heavy ion injection like Xe beam which requires high voltage in comparison with proton case. Extension of baffle slits on injection line of Ring Cyclotron also has been done to extend the flexibility of injection orbit. Modification of low energy beam transport (LEBT) from 18GHz Superconducting ECR ion source to AVF injection axis also has been carried.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)