A laser ion source based on Nd:YAG laser has been being studied at the Institute of Modern Physics for the production of high intensity high charge state heavy ion beams in the past ten years, for possible applications both in a future accelerator complex and in heavy ion cancer therapy facilities. Based on the previous results for the production of multiple-charged ions from a wide range of heavy elements with a 3 J/8 ns Nd:YAG laser [Zhao et al., Rev. Sci. Instrum. 85, 02B910 (2014)], higher laser energy and intensity in the focal spot are necessary for the production of highly charged ions from the elements heavier than aluminum. Therefore, the laser ion source was upgraded with a new Nd:YAG laser, the maximum energy of which is 8 J and the pulse duration can be adjusted from 8 to 18 ns. Since then, the charge state distributions of ions from various elements generated by the 8 J Nd:YAG laser were investigated for different experimental conditions, such as laser energy, pulse duration, power density in the focal spot, and incidence angle. It was shown that the incidence angle is one of the most important parameters for the production of highly charged ions. The capability of producing highly charged ions from the elements lighter than silver was demonstrated with the incidence angle of 10° and laser power density of 8 × 1013 W cm−2 in the focal spot, which makes a laser ion source complementary to the superconducting electron cyclotron resonance ion source for the future accelerator complex especially in terms of the ion beam production from some refractory elements. Nevertheless, great efforts with regard to the extraction of intense ion beams, modification of the ion beam pulse duration, and reliability of the ion source still need to be made for practical applications.
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February 2016
Research Article|
December 10 2015
New development of laser ion source for highly charged ion beam production at Institute of Modern Physics (invited)
H. Y. Zhao;
H. Y. Zhao
a)
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
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J. J. Zhang;
J. J. Zhang
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
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Q. Y. Jin;
Q. Y. Jin
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
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W. Liu;
W. Liu
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
2
University of Chinese Academy of Sciences
, Beijing 100049, China
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G. C. Wang;
G. C. Wang
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
2
University of Chinese Academy of Sciences
, Beijing 100049, China
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L. T. Sun;
L. T. Sun
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
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X. Z. Zhang;
X. Z. Zhang
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
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H. W. Zhao
H. W. Zhao
1Institute of Modern Physics,
Chinese Academy of Sciences
, Lanzhou 730000, China
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a)
Author to whom correspondence should be addressed. Electronic mail: zhaohy@impcas.ac.cn.
Invited paper, published as part of the Proceedings of the 16th International Conference on Ion Sources, New York, New York, USA, August 2015.
Rev. Sci. Instrum. 87, 02A917 (2016)
Article history
Received:
August 21 2015
Accepted:
November 20 2015
Citation
H. Y. Zhao, J. J. Zhang, Q. Y. Jin, W. Liu, G. C. Wang, L. T. Sun, X. Z. Zhang, H. W. Zhao; New development of laser ion source for highly charged ion beam production at Institute of Modern Physics (invited). Rev. Sci. Instrum. 1 February 2016; 87 (2): 02A917. https://doi.org/10.1063/1.4937115
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