Wide Bandgap Extrinsic Photoconductive Switches Page: 4 of 245
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There has been a recent increase in research to develop inexpensive, compact, charged
particle accelerator systems intended for pulsed radiography and medical applications. This
research activity has been motivated, in part, by the dielectric wall accelerator (DWA)
concept [1.1] illustrated in Figure 1.1. The DWA can reduce the length of an accelerating
structure by up to two orders of magnitude as compared to Linear Induction and RF Linear
Accelerators of comparable energy. The advantage of the DWA approach is that the pulsed
Figure 1.1 Dielectric Wall Accelerator concept
accelerating field can be applied along the entire length of the high gradient insulator (HGI)
[1.2] vacuum wall. The magnitude of the applied field in the DWA is limited only by the
dielectric strength of the HGI, which is believed be up to 100 MV/m for pulse widths of
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Sullivan, J S. Wide Bandgap Extrinsic Photoconductive Switches, thesis or dissertation, January 17, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc835750/m1/4/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.