Simple Circuit for Obtaining the Electron Energy Distribution in a Plasma
作者:
E. Alexeff,
D. F. Howell,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 12
页码: 4877-4882
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1657307
出版商: AIP
数据来源: AIP
摘要:
We describe a very simple technique for obtaining an instantaneous display of the electron energy distribution in a plasma. We electronically doubly differentiate the current‐voltage characteristic of the Langmuir probe, following the method of Druyvesteyn. In our technique, we use operational amplifiers for differentiation. Our new contributions are: First, we have discovered where the noise is produced that formerly made operational amplifiers unsatisfactory; second, we have demonstrated that this noise can be eliminated; and third, we have produced simple techniques for cross checking our double‐differentiating system to demonstrate that the noise‐elimination process does not appreciably distort the desired information.
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