The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 1986
Filed:
Dec. 12, 1983
Mamoru Matsuoka, Ibaraki, JP;
Japan Atomic Energy Research Institute, Tokyo, JP;
Abstract
The present invention provides an arc discharge abnormality detecting system which in generating source plasma by the arc discharge using a plurality of filaments as the cathode in an ion source, detects an arc discharge current flowing in each of the filaments and detects the abnormality in the arc discharge when the arc discharge currents are not balanced. Further, the present invention provides an arc discharge abnormality detecting system in which said ion source is an ion source used in a neutral beam injector and a logic circuit detects the abnormality in the arc discharge when unbalance in the arc discharge currents larger than a predetermined value exists between the filaments over a predetermined period of time continuously.