JPS6476643A - Electron current source - Google Patents
Electron current sourceInfo
- Publication number
- JPS6476643A JPS6476643A JP23153687A JP23153687A JPS6476643A JP S6476643 A JPS6476643 A JP S6476643A JP 23153687 A JP23153687 A JP 23153687A JP 23153687 A JP23153687 A JP 23153687A JP S6476643 A JPS6476643 A JP S6476643A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- electron beam
- filament
- heater
- type heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Electron Sources, Ion Sources (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
PURPOSE:To decrease the load for a filament and extend its life by heating a cathode with an electron beam type heater without heating it with a filament type heater directly. CONSTITUTION:Electrons emitted from a heater cathode 1 by the potential applied across a cathode 6 and an electron beam type heater 50 heating the heater cathode 1 by the heat generated by a filament 2 form an electron beam 5, which is accelerated and hits the cathode 6 and heats it. The electron beam 5 is accelerated and focused by an electric field lens 4 formed by the cathode 1, a focusing electrode 3, and the cathode 6 and concentratively heats a point with a very small surface area. The cathode 6 can be kept at a high temperature even if it is so small that a filament type heater can not be incorporated, and an electron current with a fine diameter is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23153687A JPS6476643A (en) | 1987-09-16 | 1987-09-16 | Electron current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23153687A JPS6476643A (en) | 1987-09-16 | 1987-09-16 | Electron current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6476643A true JPS6476643A (en) | 1989-03-22 |
Family
ID=16925033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23153687A Pending JPS6476643A (en) | 1987-09-16 | 1987-09-16 | Electron current source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6476643A (en) |
-
1987
- 1987-09-16 JP JP23153687A patent/JPS6476643A/en active Pending
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