Effect of background fluctuation on velocity diagnostics by Mach probe

Yunxiao WEI (魏云逍); Zhe GAO (高喆)

doi:10.1088/2058-6272/abbb79

Plasma Science and Technology > 2020 > 22(12): 125102. > DOI: 10.1088/2058-6272/abbb79

Yunxiao WEI (魏云逍), Zhe GAO (高喆). Effect of background fluctuation on velocity diagnostics by Mach probe[J]. Plasma Science and Technology, 2020, 22(12): 125102. DOI: 10.1088/2058-6272/abbb79

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Effect of background fluctuation on velocity diagnostics by Mach probe

Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China

Funds: This work was supported by National Natural Science Foundation of China (Nos. 11827810 and 11875177), Inter- national Atomic Energy Agency Research Contract No. 22733 and the National Ten Thousand Talent Program.

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Received Date: August 05, 2020
Revised Date: September 22, 2020
Accepted Date: September 23, 2020

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Abstract

Abstract

The effect of background fluctuation on velocity diagnostics is discussed and studied. The kinetic theory of Mach probe (MP) and the theory of BGK mode are combined to evaluate how the measurement of MP is affected by electrostatics fluctuation. It is found that the quantity of speed by the MP model is closer to the effective velocity in the picture of momentum flux rather than the real mean velocity, while, with high fluctuation, the fitting parameter of MP's exponential formula should be corrected.
- velocity diagnostics,
- Mach probe,
- electrostatic fluctuation

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References (24)

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