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Title: Single-turn extraction from a K110 AVF cyclotron by flat-top acceleration

Abstract

Single-turn extraction from the Japan Atomic Energy Agency AVF cyclotron with a K number of 110 using a flat-top (FT) acceleration system has been achieved to reduce the energy spread of an ion beam for microbeam formation with energy up to hundreds of MeV and to increase extraction efficiency from the cyclotron. In order to generate a FT waveform voltage using the fifth-harmonic frequency on a dee electrode, a FT resonator was designed using MAFIA code to achieve downsizing and low power consumption. The FT resonator, coupled to the main resonator through a coupling capacitor, covered the full range of the fifth harmonic frequency from 55 to 110 MHz. Various ion beams, accelerated using different acceleration harmonic modes of h=1 and 2, such as 220 MeV {sup 12}C{sup 5+} (h=2), 260 MeV {sup 20}Ne{sup 7+} (h=2), and 45 MeV H{sup +} (h=1), were developed by FT acceleration. A clear turn separation of the beam bunches was successfully observed at the extraction region of the large-scale AVF cyclotron with number of revolutions greater than 200. As a result, high extraction efficiency (over 95%) from the cyclotron was achieved. Single-turn extraction was confirmed by counting the number of beam bunches out ofmore » the cyclotron for an injected beam pulsed by a beam chopping system in the injection line. The energy spread of the 260 MeV {sup 20}Ne{sup 7+} beam was measured using an analyzing magnet, and we verified a reduction in the energy spread from {delta}E/E=0.1% to 0.05% by single-turn extraction after FT acceleration.« less

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2]
  1. Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292 (Japan)
  2. Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
Publication Date:
OSTI Identifier:
21266766
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 80; Journal Issue: 3; Other Information: DOI: 10.1063/1.3093810; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; BEAM BUNCHERS; BEAM BUNCHING; BEAM PULSERS; CYCLOTRONS; ELECTRIC POTENTIAL; ION BEAMS; MAGNETS; MEV RANGE; PARTICLE BEAMS; RESONATORS; WAVE FORMS

Citation Formats

Kurashima, Satoshi, Miyawaki, Nobumasa, Okumura, Susumu, Ishibori, Ikuo, Nara, Takayuki, Agematsu, Takashi, Yoshida, Ken-ichi, Yokota, Watalu, Nakamura, Yoshiteru, Arakawa, Kazuo, and Fukuda, Mitsuhiro. Single-turn extraction from a K110 AVF cyclotron by flat-top acceleration. United States: N. p., 2009. Web. doi:10.1063/1.3093810.
Kurashima, Satoshi, Miyawaki, Nobumasa, Okumura, Susumu, Ishibori, Ikuo, Nara, Takayuki, Agematsu, Takashi, Yoshida, Ken-ichi, Yokota, Watalu, Nakamura, Yoshiteru, Arakawa, Kazuo, & Fukuda, Mitsuhiro. Single-turn extraction from a K110 AVF cyclotron by flat-top acceleration. United States. https://doi.org/10.1063/1.3093810
Kurashima, Satoshi, Miyawaki, Nobumasa, Okumura, Susumu, Ishibori, Ikuo, Nara, Takayuki, Agematsu, Takashi, Yoshida, Ken-ichi, Yokota, Watalu, Nakamura, Yoshiteru, Arakawa, Kazuo, and Fukuda, Mitsuhiro. 2009. "Single-turn extraction from a K110 AVF cyclotron by flat-top acceleration". United States. https://doi.org/10.1063/1.3093810.
@article{osti_21266766,
title = {Single-turn extraction from a K110 AVF cyclotron by flat-top acceleration},
author = {Kurashima, Satoshi and Miyawaki, Nobumasa and Okumura, Susumu and Ishibori, Ikuo and Nara, Takayuki and Agematsu, Takashi and Yoshida, Ken-ichi and Yokota, Watalu and Nakamura, Yoshiteru and Arakawa, Kazuo and Fukuda, Mitsuhiro},
abstractNote = {Single-turn extraction from the Japan Atomic Energy Agency AVF cyclotron with a K number of 110 using a flat-top (FT) acceleration system has been achieved to reduce the energy spread of an ion beam for microbeam formation with energy up to hundreds of MeV and to increase extraction efficiency from the cyclotron. In order to generate a FT waveform voltage using the fifth-harmonic frequency on a dee electrode, a FT resonator was designed using MAFIA code to achieve downsizing and low power consumption. The FT resonator, coupled to the main resonator through a coupling capacitor, covered the full range of the fifth harmonic frequency from 55 to 110 MHz. Various ion beams, accelerated using different acceleration harmonic modes of h=1 and 2, such as 220 MeV {sup 12}C{sup 5+} (h=2), 260 MeV {sup 20}Ne{sup 7+} (h=2), and 45 MeV H{sup +} (h=1), were developed by FT acceleration. A clear turn separation of the beam bunches was successfully observed at the extraction region of the large-scale AVF cyclotron with number of revolutions greater than 200. As a result, high extraction efficiency (over 95%) from the cyclotron was achieved. Single-turn extraction was confirmed by counting the number of beam bunches out of the cyclotron for an injected beam pulsed by a beam chopping system in the injection line. The energy spread of the 260 MeV {sup 20}Ne{sup 7+} beam was measured using an analyzing magnet, and we verified a reduction in the energy spread from {delta}E/E=0.1% to 0.05% by single-turn extraction after FT acceleration.},
doi = {10.1063/1.3093810},
url = {https://www.osti.gov/biblio/21266766}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 3,
volume = 80,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2009},
month = {Sun Mar 15 00:00:00 EDT 2009}
}