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Title: DIELECTRIC WALL ACCELERATOR TECHNOLOGY

Abstract

The dielectric wall accelerator (DWA) is a compact pulsed power device where the pulse forming lines, switching, and vacuum wall are integrated into a single compact geometry. For this effort, we initiated a extensive compact pulsed power development program and have pursued the study of switching (gas, oil, laser induced surface flashover and photoconductive), dielectrics (ceramics and nanoparticle composites), pulse forming line topologies (asymmetric and symmetric Blumleins and zero integral pulse forming lines), and multilayered vacuum insulator (HGI) technology. Finally, we fabricated an accelerator cell for test on ETAII (a 5.5 MeV, 2 kA, 70 ns pulsewidth electron beam accelerator). We review our past results and report on the progress of accelerator cell testing.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
922326
Report Number(s):
UCRL-CONF-235728
TRN: US0801148
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Pulsed Power Conference, Albuquerque, NM, United States, Jun 18 - Jun 22, 2007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; 43 PARTICLE ACCELERATORS; ACCELERATORS; CERAMICS; DIELECTRIC MATERIALS; ELECTRON BEAMS; FLASHOVER; GEOMETRY; LASERS; TESTING

Citation Formats

Sampayan, S, Caporaso, G, Chen, Y, Harris, J, Hawkins, S, Holmes, C, Nelson, S, Poole, B, Rhodes, M, Sanders, D, Sullivan, J, Wang, L, and Watson, J. DIELECTRIC WALL ACCELERATOR TECHNOLOGY. United States: N. p., 2007. Web.
Sampayan, S, Caporaso, G, Chen, Y, Harris, J, Hawkins, S, Holmes, C, Nelson, S, Poole, B, Rhodes, M, Sanders, D, Sullivan, J, Wang, L, & Watson, J. DIELECTRIC WALL ACCELERATOR TECHNOLOGY. United States.
Sampayan, S, Caporaso, G, Chen, Y, Harris, J, Hawkins, S, Holmes, C, Nelson, S, Poole, B, Rhodes, M, Sanders, D, Sullivan, J, Wang, L, and Watson, J. 2007. "DIELECTRIC WALL ACCELERATOR TECHNOLOGY". United States. doi:. https://www.osti.gov/servlets/purl/922326.
@article{osti_922326,
title = {DIELECTRIC WALL ACCELERATOR TECHNOLOGY},
author = {Sampayan, S and Caporaso, G and Chen, Y and Harris, J and Hawkins, S and Holmes, C and Nelson, S and Poole, B and Rhodes, M and Sanders, D and Sullivan, J and Wang, L and Watson, J},
abstractNote = {The dielectric wall accelerator (DWA) is a compact pulsed power device where the pulse forming lines, switching, and vacuum wall are integrated into a single compact geometry. For this effort, we initiated a extensive compact pulsed power development program and have pursued the study of switching (gas, oil, laser induced surface flashover and photoconductive), dielectrics (ceramics and nanoparticle composites), pulse forming line topologies (asymmetric and symmetric Blumleins and zero integral pulse forming lines), and multilayered vacuum insulator (HGI) technology. Finally, we fabricated an accelerator cell for test on ETAII (a 5.5 MeV, 2 kA, 70 ns pulsewidth electron beam accelerator). We review our past results and report on the progress of accelerator cell testing.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2007,
month =
}

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  • We are developing an inexpensive compact accelerator system primarily intended for pulsed radiography. Design characteristics are an 8 MeV endpoint energy, 2 kA beam current, a cell gradient of approximately 3 MV/m (for an overall accelerator length is 2-3 m), and <$1/Volt capital costs. Such designs have been made possible with the development of high specific energy dielectrics (>10J/cm{sup 3}), specialized transmission line designs and multi-gap laser triggered low jitter (<1 ns) gas switches. In this geometry, the pulse forming lines, switches, and insulator/beam pipe are fully integrated within each cell to form a compact, stand-alone, stackable unit. We detailmore » our research and modeling to date, recent high voltage test results, and the integration concept of the cells into a radiographic system.« less
  • Insulators composed of finely spaced alternating layers of dielectric and metal are thought to minimize secondary emission avalanche (SEA) growth. Most data to date was taken with small samples (order 10 cm{sup 2} area) in the absence of an ion or electron beam. The authors have begun long pulse (>1 {mu}s) high voltage testing of small hard seal samples. Further, they have performed short pulse (20 ns) high voltage testing of moderate scale bonded samples (order 100 cm{sup 2} area) in the presence of a 1 kA electron beam. Results thus far indicate a 1.0 to 4.0 increase in themore » breakdown electric field stress is possible with this technology.« less
  • A compact proton accelerator for cancer treatment is being developed by using the high-gradient dielectric insulator wall (DWA) technology [1-4]. We are testing all the essential DWA components, including a compact proton source, on the First Article System Test (FAST). The configuration and progress on the injector and FAST will be presented.
  • Fast, low jitter command triggered switching is key to the successful implementation of the dielectric wall accelerator (DWA). We are studying a UV induced vacuum surface flashover switch for this purpose. We present our initial data using a Nd:YAG laser incident onto a high gradient insulator surface at 1{omega}, 2{omega}, and 4{omega}. Best 1{sigma} jitter was <1 ns with no degradation of the switch after 500 shots.