Beam Transport in a Compact Dielectric Wall Induction Accelerator System for Pulsed Radiography

McCarrick, J.; Caporaso, G.J.; Chen, Y.-J.

doi:10.1109/pac.2005.1591137

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…1). Variants of this technology will be suitable for a number of applications, including radiography 3 and radiation therapy 4 . The desire for compact systems and high accelerating gradients in these machines has driven improvements in several areas, especially transmission lines 5 , dielectric materials 6 , and fast photoconductive switching 7 .…”

Section: Introductionmentioning

confidence: 99%

Vacuum insulator development for the dielectric wall accelerator

Harris

Blackfield

Caporaso

et al. 2008

Journal of Applied Physics

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At Lawrence Livermore National Laboratory, we are developing a new type of accelerator, known as a Dielectric Wall Accelerator, in which compact pulse forming lines directly apply an accelerating field to the beam through an insulating vacuum boundary. The electrical strength of this insulator may define the maximum gradient achievable in these machines. To increase the system gradient, we are using "High Gradient Insulators" composed of alternating layers of dielectric and metal for the vacuum insulator. In this paper, we present our recent results from experiment and simulation, including the first test of a High Gradient Insulator in a functioning Dielectric Wall Accelerator cell. a) Electronic mail: harris89@llnl.gov 2

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Section: Introductionmentioning

confidence: 99%

Vacuum insulator development for the dielectric wall accelerator

Harris

Blackfield

Caporaso

et al. 2008

Journal of Applied Physics

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“…In addition, they have microwave properties that are useful for accelerators [11]. HGIs are a key enabling technology for a series of new, innovative accelerator concepts, including improved induction cells [12,13], novel optically-triggered high-voltage switches [14], and dielectric-wall accelerators [9,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Multilayer High-Gradient Insulators

Harris

2006

2006 International Symposium on Discharges and Electrical Insulation in Vacuum

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High voltage systems operated in vacuum require insulating materials to maintain spacing between conductors held at different potentials, and may be used to maintain a nonconductive vacuum boundary. Traditional vacuum insulators generally consist of a single material, but insulating structures composed of alternating layers of dielectric and metal can also be built.These "High-Gradient Insulators" have been experimentally shown to withstand higher voltage gradients than comparable conventional insulators. As a result, they have application to a wide range of highvoltage vacuum systems where compact size is important. This paper describes ongoing research on these structures, as well as the current theoretical understanding driving this work.

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“…Even at this higher limit, the time integrated spot size is 0.6 mm radius at the final focus magnet. And the on axis dose is 20.5 Rad in air at 1 m [4,5].…”

Section: Introductionmentioning

confidence: 99%

Development of a Compact Radiography Accelerator Using Dielectric Wall Accelerator Technology

Sampayan

Caporaso

Chen

et al. 2005

2005 IEEE Pulsed Power Conference

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* This work was supported under the auspices of the US Department of Energy, the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.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 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 detail our research and modeling to date, recent high voltage test results, and the integration concept of the cells into a radiographic system.

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Beam Transport in a Compact Dielectric Wall Induction Accelerator System for Pulsed Radiography

Cited by 5 publications

References 4 publications

Vacuum insulator development for the dielectric wall accelerator

Vacuum insulator development for the dielectric wall accelerator

Multilayer High-Gradient Insulators

Development of a Compact Radiography Accelerator Using Dielectric Wall Accelerator Technology

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