公开(公告)号：US3555411A

公开(公告)日：1971-01-12

申请号：US3555411D

申请日：1969-02-14

Applicant: ATOMIC ENERGY COMMISSION

Inventor： WOODS ROBERT O

IPC: H01J41/06 ,  G01N27/62

CPC classification number: H01J41/06

Abstract: A COLD CATHODE MAGNETRON IONIZATION GAUGE FOR MEASURING VERY LOW PRESSURES, PARTICULARLY IN ENVIRONMENTS SUBJECT TO HIGH ACCELERATION AND VIBRATION CONDITIONS. MAGNETIC FLUX FOR INFLUENCING THE PATH OF ELECTRONS IS PROVIDED BY MEANS OF A HOLLOW MAGNET ENTIRELY ENCLOSED WITHIN THE GAUGE CAVITY. THE LOCATION OF THE MAGNET AND THE POSITION AND CONFIGURATION OF A PAIR OF CATHODES IS SUCH THAT A MAXIMUM PORTION OF THE AVAILABLE FLUX IS CONFINED TO THE USEFUL INTERNAL VOLUME OF THE GAUGE. THIS CONSTRUCTION ENSURES THAT MAGNETIC FLUX CLOSING OUTSIDE THE GAUGE IS HELD TO A MINIMUM.