CHUN HO CHAN
Pilots at Skywest Dr, Hayward, CA
License number
California A4867039
Issued Date
Jan 2012
Expiration Date
Jan 2013
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
20511 Skywest Dr, Hayward, CA 94541
Professional information
Negative Ion Beam Injection Apparatus With Magnetic Shield And Electron Removal Means
US Patent:
5365070, Nov 15, 1994
Filed:
Apr 29, 1992
Appl. No.:
7/875778
Inventors:
Oscar A. Anderson - Berkeley CA
Chun F. Chan - Hayward CA
Ka-Ngo Leung - Hercules CA
Chun F. Chan - Hayward CA
Ka-Ngo Leung - Hercules CA
Assignee:
The Regents of the University of California - Oakland CA
International Classification:
H01J 2702
US Classification:
250423R
Abstract:
A negative ion source is constructed to produce H. sup. - ions without using Cesium. A high percentage of secondary electrons that typically accompany the extracted H. sup. - are trapped and eliminated from the beam by permanent magnets in the initial stage of acceleration. Penetration of the magnetic field from the permanent magnets into the ion source is minimized. This reduces the destructive effect the magnetic field could have on negative ion production and extraction from the source. A beam expansion section in the extractor results in a strongly converged final beam.