HIAT2015 - List of Authors (Kurashima, S.)

Paper	Title	Page
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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Paper

Title

Page

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