High power electron gun
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United States of America Patent
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May 12, 1987
Grant Date -
N/A
app pub date -
Apr 14, 1986
filing date -
May 31, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high beam power electron gun of the axial type, particularly useful in large-scale vacuum metallurgy plants for melting, vaporizing and heat treating. The electron gun is controllable over its entire power range, i.e., from 10% to 100% of its nominal power, while the focal length of its beam guidance lens is maintained unchanged. This lens is downstream of a cathode, a focusing electrode and a movable anode, and is provided on its upstream side with a pole shoe to which the anode is fastened and which, together with the anode, is movable as a single unit in the axial direction for controlling the power.
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