Plasma window is a feasible device as an atmosphere–vacuum interface, which can withstand energetic particle beams. It is, however, essential to enlarge the diameter to several tens of millimeters for actual beam passing in the accelerator applications. The pressure separation performance and discharge voltage V current I characteristics should be investigated in detail to design the plasma window for each purpose. Therefore, a cascade arc discharge device with a diameter of up to 20 mm was developed, and its characteristics as a function of diameter were examined. As a result, with an increase in the channel diameter, the discharge pressure that was achieved decreased, whose values were smaller compared with the values by the prediction formula, assuming the viscous gas flow with a constant plasma temperature. It showed that the bulk plasma temperature for the larger discharge channel was low because of the low-current density over the channel. Furthermore, the transition of the V−I slope was observed with an increase in the diameter.
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Research Article|
May 18 2020
Characteristics of plasma window with various channel diameters for accelerator applications
N. Ikoma
;
N. Ikoma
a)
1
Nishina Center for Accelerator-Based Science, RIKEN
, Saitama 351-0198, Japan
a)Also at: Graduate School of Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan. Author to whom correspondence should be addressed: ikoma@myppj.com
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Y. Miyake;
Y. Miyake
1
Nishina Center for Accelerator-Based Science, RIKEN
, Saitama 351-0198, Japan
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M. Takahashi;
M. Takahashi
1
Nishina Center for Accelerator-Based Science, RIKEN
, Saitama 351-0198, Japan
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H. Okuno;
H. Okuno
1
Nishina Center for Accelerator-Based Science, RIKEN
, Saitama 351-0198, Japan
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S. Namba
;
S. Namba
2
Graduate School of Engineering, Hiroshima University
, Hiroshima 739-8527, Japan
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K. Takahashi
;
K. Takahashi
3
Graduate School of Engineering, Nagaoka University of Technology
, Niigata 940-2188, Japan
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T. Sasaki
;
T. Sasaki
3
Graduate School of Engineering, Nagaoka University of Technology
, Niigata 940-2188, Japan
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T. Kikuchi
T. Kikuchi
3
Graduate School of Engineering, Nagaoka University of Technology
, Niigata 940-2188, Japan
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a)Also at: Graduate School of Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan. Author to whom correspondence should be addressed: ikoma@myppj.com
Rev. Sci. Instrum. 91, 053503 (2020)
Article history
Received:
November 30 2019
Accepted:
April 29 2020
Citation
N. Ikoma, Y. Miyake, M. Takahashi, H. Okuno, S. Namba, K. Takahashi, T. Sasaki, T. Kikuchi; Characteristics of plasma window with various channel diameters for accelerator applications. Rev. Sci. Instrum. 1 May 2020; 91 (5): 053503. https://doi.org/10.1063/1.5140709
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