DocumentCode :
1906631
Title :
Beam propagation options for intense electron beams in welding and materials processing applications
Author :
Hubbard, R.F. ; Fernsler, R.F. ; Lampe, M.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
fYear :
1993
fDate :
7-9 June 1993
Firstpage :
75
Abstract :
Summary form only given. A typical high-intensity electron-beam device for welding and materials processing applications might produce beams with energies of several MeV, currents of 0.1-10 kA, radii as small as 1 mm, pulse lengths of tens of nsec, and pulse repetition rates up to several kHz. This dramatic increase in beam energy and peak power offers several new capabilities, including the potential for self-pinched propagation in ambient air over distances of a few tens of cm. This capability would eliminate the need for vacuum pumping and magnetic focusing required for most present-day electron beam welders. The choice of beam parameters in the high-power regime is found to be constrained mainly by gas scattering and the resistive hose instability. For applications such as welding which would require very tight beams, the emittance tailoring techniques often used to control the instability in present experiments are not expected to be effective in this regime, and the stable propagation range is expected to be only a few betatron wavelengths. Nevertheless, a wide range of acceptable parameters is available, especially when use is made of a narrow conducting pipe to guide the beam to the workpiece.
Keywords :
electron beams; 0.1 to 10 kA; 1 mm; 2 mm; ambient air; beam energy; betatron wavelengths; electron beam welders; emittance tailoring techniques; gas scattering; high-intensity electron-beam device; high-power regime; intense electron beams; magnetic focusing; materials processing applications; narrow conducting pipe; peak power; pulse repetition rates; resistive hose instability; self-pinched propagation; stable propagation range; vacuum pumping; welding; Electron beams; Laboratories; Magnetosphere; Materials processing; Particle beams; Physics; Plasma applications; Plasma density; Plasma materials processing; Plasma welding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 1993. IEEE Conference Record - Abstracts., 1993 IEEE International Conference on
Conference_Location :
Vancouver, BC, Canada
ISSN :
0730-9244
Print_ISBN :
0-7803-1360-7
Type :
conf
DOI :
10.1109/PLASMA.1993.593018
Filename :
593018
Link To Document :
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