NDLI: 3D calculations for a 4 kA, 3.5 MV, 2.5 microsecond injector

Content Provider	IEEE Xplore Digital Library
Author	Hughes, T.P. Clark, R.E. Yu, S.S.
Copyright Year	1999
Description	Author affiliation: Mission Res. Corp., Albuquerque, NM, USA (Hughes, T.P.)
Abstract	The DARHT-2 machine under construction at Los Alamos National Laboratory requires a long-pulse (2.5 /spl mu/sec) 2-4 kA, 3.5 MV, low-emittance electron beam source. The injector is being designed at LBNL and consists of a large-area thermionic cathode mounted atop a vertical column. The 90/spl deg/ bend between the horizontally emitted beam and the column produces dipole and higher-pole fields which must be corrected. In addition, the fast rise of the current flowing into the vacuum rank excites RF modes which cause transverse oscillations of the beam centroid. We have modeled these effects with the 3D electromagnetic code LSP. The code has models for pulsed power transmission-lines attached to boundaries, space-charge-limited emission and transport of charged particles, externally applied magnetic fields, and frequency-dependent absorption of RF. We calculate the transverse displacement of the beam as a function of time during the current pulse, and the positioning and thickness of ferrite absorber needed to damp the RF modes. The numerical results are compared to analytic calculations.
Starting Page	2746
Ending Page	2748
File Size	208859
Page Count	3
File Format	PDF
ISBN	0780355733
DOI	10.1109/PAC.1999.792924
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-03-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Structural beams Radio frequency Laboratories Electron beams Cathodes Electromagnetic modeling Transmission lines Magnetic fields Electromagnetic wave absorption Particle beams
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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