Publication detail

Noise of low-energy electron beam

ŠIKULA, J. GRMELA, L. BARTLOVÁ, M. KUPAROWITZ, T. KNÁPEK, A. MÍKA, F.

Original Title

Noise of low-energy electron beam

Type

conference paper

Language

English

Original Abstract

Noise diagnostics were performed on a tungsten hair-pin cathode operating in a vacuum (3 · 10-3 Pa). The cathode operates in thermal emission mode at several temperatures based on the level of heating. Several acceleration voltages have been used starting at 5 kV, 10 kV and 20 kV up to 30 kV. There were two modes-with and without electron beam scanning. Both setups were compared from the point of view of the noise spectral density value. Shot noise is about one order below the current noise spectral density of the electron beam. Therefore, in this case the shot noise spectral density can be neglected. Noise spectral density is 1/f type at the frequency band 0.1 to 10 Hz for cathode with thin film of tungsten oxides. For accelerating voltage from 5 to 20 kV noise in the frequency band from 2 to 20 Hz can be described by the g-r noise with noise spectral density proportional to square of a beam current. At accelerating voltage 30 kV a new g-r noise component appears which is related to electric field distribution among anode; condensers, stigmators and objective.

Keywords

electronic noise; low-energy electron beam; thermal-emission cathode

Authors

ŠIKULA, J.; GRMELA, L.; BARTLOVÁ, M.; KUPAROWITZ, T.; KNÁPEK, A.; MÍKA, F.

RIV year

2015

Released

2. 10. 2015

ISBN

9781467383356

Book

2015 International Conference on Noise and Fluctuations, ICNF 2015

Pages from

1

Pages to

4

Pages count

4

URL

https://ieeexplore.ieee.org/document/7288583

BibTex

@inproceedings{BUT127450,
  author="Josef {Šikula} and Lubomír {Grmela} and Milada {Bartlová} and Tomáš {Kuparowitz} and Alexandr {Knápek} and Filip {Mika}",
  title="Noise of low-energy electron beam",
  booktitle="2015 International Conference on Noise and Fluctuations, ICNF 2015",
  year="2015",
  pages="1--4",
  doi="10.1109/ICNF.2015.7288583",
  isbn="9781467383356",
  url="https://ieeexplore.ieee.org/document/7288583"
}