DocumentCode :
881698
Title :
Excitation of a Canonical RF Shelter with Relativistic Electrons and with Enhanced Risetime Bremsstrahlung
Author :
Bushell, M. ; Graybill, S. ; Litz, M. ; Merkel, G. ; Roberts, H.
Author_Institution :
US Army Electronics Research and Development Command Harry Diamond Laboratories 2800 Powder Mill Road Adelphi, Maryland 20783
Volume :
32
Issue :
6
fYear :
1985
Firstpage :
4320
Lastpage :
4325
Abstract :
In two tests at the Aurora flash x-ray machine, a cavity (canonical rf shelter) was excited in two ways: (1) with relativistic electrons, and (2) with enhanced-risetime bremsstrahlung. Differences in cavity excitation resulting from the two types of sources are explored. The relativistic electrons excite the cavity producing large electric fields (>80 kV/m), but are not expected to produce much of a SGEMP response in individual cables and electronic boxes inside the shelter, because the electrons are easily shielded by such enclosures. The relativistic electron current density in the case of direct e-beam injection is about two orders of magnitude greater than the Compton electron current density produced by enhanced risetime bremsstrahlung. The direct e-beam currents, therefore, excite significantly larger electromagnetic fields than the bremsstrahlung produced Compton currents. The greater penetrating power of the bremsstrahlung radiation, on the other hand, excites both the larger cavity and smaller interior sub-cavities and cables. The two methods thus provide a possible means of distinguishing between different types of SGEMP excitation. Conclusions are drawn from the results concerning the feasibility of using relativistic electrons in SREMP simulation schemes.
Keywords :
Cables; Current density; EMP radiation effects; Electromagnetic fields; Electron beams; Electronic equipment; Electronic equipment testing; Ionizing radiation; Joining processes; Radio frequency;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.1985.4334116
Filename :
4334116
Link To Document :
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