Electrical characteristics of a low pressure wire discharge and an application to high current density electron gun

✍ Scribed by Hiroyuki Yasui; Tohru Tamagawa; Iwao Ohshima; Hajime Urai; Eiki Hotta

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 244 KB
• Volume: 46
• Category: Article
• ISSN: 0969-806X
• DOI: 10.1016/0969-806x(95)00203-a

✦ Synopsis

The electrical characteristics of a wire discharge plasma were investigated, in particular, taking notice of the effect of electron trapping by axial magnetic fields. It was found that the plasma property changed remarkably, when the magnetic fields were applied. This property may be used to control the wire discharge plasma. The wire discharge plasma plays an important part as an ion source of an ion-induced secondary emission electron gun. This type of electron gun was demonstrated. The maximum electron beam current obtained was 90mA/cm 2 at beam energy of 100keV. In our calculation model, the secondary emission coefficient 7 is 12.0 for 100keV helium ion and the electron beam extraction efficiency/~ obtained is 0.35.