Behavior of Electron Ernission Source on Field Emission in Vacuum

Itaru Takasaki; Eiji Takahashi; Masakazu Wada; Hideo Mitui; Mototaka Sone

doi:10.1541/ieejfms1990.114.2_84

Itaru Takasaki, Eiji Takahashi, Masakazu Wada, Hideo Mitui, Mototaka Sone

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JOURNAL FREE ACCESS

1994 Volume 114 Issue 2 Pages 84-90

DOI https://doi.org/10.1541/ieejfms1990.114.2_84

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Published: February 20, 1994 Received: August 31, 1993 Available on J-STAGE: July 15, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 15, 2008 Reason for correction: - Correction: DTRECEIVED Details: Wrong : 19930705
Right : 19930831

Date of correction: July 15, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : One of mechanisms of electron emission under high field is generally known as the Fowler-Nordheim Theory. In this theory, electron emission sources are assumed by the projections where the field strength is multiplied. The nonuniformity of the field strength is expressed by the Field-Enhancement-Factor: β. The β has been used to represent the sharpness of the emission source. However, the electron emission sources are merely imaginary one, because these have not been
confirmed visually.
In this study, in order to investigate the field emission more closely, we used the Micro-Channel-Plate (MCP) with luminescent screen anode, and observed the location and behavior with applied time of the emission sources by CCD Camera. As the results, the electron emlssiom cathode was not observed from whole surface uniformmly but from points. It was found that the electrons were emitted from the micro-points located at the metal surface and there are a lot of micro-points at the surface. And, observing the behavior of micro-points with applied voltage time, it was found that the creation and disappearance of micro-points were repeated on the cathode surface. However, almost points do not emit electrons again. Inaddtion, the aging effect of micro-points by electron emission was not confirmed.
Right : One of mechanisms of electron emission under high field is generally known as the Fowler-Nordheim Theory. In this theory, electron emission sources are assumed by the projections where the field strength is multiplied. The nonuniformity of the field strength is expressed by the Field-Enhancement-Factor: β. The β has been used to represent the sharpness of the emission source. However, the electron emission sources are merely imaginary one, because these have not been confirmed visually.
In this study, in order to investigate the field emission more closely, we used the Micro-Channel-Plate (MCP) with luminescent screen anode, and observed the location and behavior with applied time of the emission sources by CCD Camera. As the results, the electron emlssiom cathode was not observed from whole surface uniformmly but from points. It was found that the electrons were emitted from the micro-points located at the metal surface and there are a lot of micro-points at the surface. And, observing the behavior of micro-points with applied voltage time, it was found that the creation and disappearance of micro-points were repeated on the cathode surface. However, almost points do not emit electrons again. Inaddtion, the aging effect of micro-points by electron emission was not confirmed.

Date of correction: July 15, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

One of mechanisms of electron emission under high field is generally known as the Fowler-Nordheim Theory. In this theory, electron emission sources are assumed by the projections where the field strength is multiplied. The nonuniformity of the field strength is expressed by the Field-Enhancement-Factor: β. The β has been used to represent the sharpness of the emission source. However, the electron emission sources are merely imaginary one, because these have not been confirmed visually.
In this study, in order to investigate the field emission more closely, we used the Micro-Channel-Plate (MCP) with luminescent screen anode, and observed the location and behavior with applied time of the emission sources by CCD Camera. As the results, the electron emlssiom cathode was not observed from whole surface uniformmly but from points. It was found that the electrons were emitted from the micro-points located at the metal surface and there are a lot of micro-points at the surface. And, observing the behavior of micro-points with applied voltage time, it was found that the creation and disappearance of micro-points were repeated on the cathode surface. However, almost points do not emit electrons again. Inaddtion, the aging effect of micro-points by electron emission was not confirmed.

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