To apply a laser ion source that generates a high-intensity pulsed beam to high-dose applications, such as ion implantation, a high repetition rate operation with a short pulse interval is required. However, when the pulse interval is shortened, there is a concern that a plasma, which is different from a single pulse plasma generation, may be formed due to the interaction between the preceding and following pulses. We investigated the time interval in which plasma pulses are generated without pulse-to-pulse interaction using a laser ion source with two lasers. In the experiment, a graphite target was irradiated by two laser beams (1064-nm wavelengths) with the same pulse widths (5.4 ns) and energies (15 mJ, 30 mJ, and 45 mJ) at different time intervals ranging from 1000 μs to 0 µs, and the time integrated value corresponding to the total charge amount was calculated from the measured time-of-flight signal of the generated carbon ion current. It was observed that the total charge did not change when the time interval was as low as approximately 100 µs, and the total charge rapidly decreased when the time interval was below approximately 100 µs. Thus, it was determined that the interaction occurs within a time interval of approximately 100 µs.
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March 2020
Research Article|
March 03 2020
Investigation of the time interval of plasma generation for a high repetition rate laser ion source
Special Collection:
Proceedings of the 18th International Conference on Ion Sources
H. Kashiwagi
;
H. Kashiwagi
a)
Department of Advanced Radiation Technology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology
, 1233 Watanuki-machi, Takasaki, Gunma, Japan
a)Author to whom correspondence should be addressed: [email protected]
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K. Yamada
K. Yamada
Department of Advanced Radiation Technology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology
, 1233 Watanuki-machi, Takasaki, Gunma, Japan
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a)Author to whom correspondence should be addressed: [email protected]
Note: Contributed paper, published as part of the Proceedings of the 18th International Conference on Ion Sources, Lanzhou, China, September 2019.
Rev. Sci. Instrum. 91, 033305 (2020)
Article history
Received:
October 08 2019
Accepted:
February 11 2020
Citation
H. Kashiwagi, K. Yamada; Investigation of the time interval of plasma generation for a high repetition rate laser ion source. Rev. Sci. Instrum. 1 March 2020; 91 (3): 033305. https://doi.org/10.1063/1.5130999
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