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PIC simulations of power flow in a linear transformer driver for radiographic applications

Digest of Technical Papers-IEEE International Pulsed Power Conference

Pointon, Timothy D.; Seidel, David B.; Leckbee, Joshua L.; Oliver, Bryan V.

The 7 cavity, 1 MV linear transformer driver for radiography at Sandia National Laboratories has recently been upgraded to 21 cavities with an output voltage of 2.5 MV. In this paper, results from 2-D, r-z particle-in-cell simulations of the full 21 cavity system are presented. Each cavity feed is driven with its own external RLC circuit that is independently triggered, and has a realistic 45° slanted vacuum/insulator. Electrons are emitted from the central cathode with a conventional space-charge-limited emission model. Detailed diagnostics monitor electron loss to the anode, cavity conductors, and the insulators. The most significant and encouraging result is that the simulations have absolutely no electron loss to the insulators, even with large random variations in the trigger timing. © 2011 IEEE.

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TYPE Conference YEAR 2011
ScopusOSTI

Controlling feed electron flow in MITL-driven radiographic diodes

Digest of Technical Papers-IEEE International Pulsed Power Conference

Seidel, David B.; Pointon, Timothy D.; Oliver, Bryan V.

The electrons flowing in a coaxial magnetically insulated transmission line (MITL), if allowed to flow uncontrolled into a radiographic electron diode load, can have an adverse impact on the performance of the system. Total radiation dose, impedance lifetime, and spot quality (size, shape, position, and stability) can all be affected. Current approaches to deal with this problem require a large volume in the vicinity of the electron diode load. For applications where this volume is not available, an alternate method of controlling the feed electrons is needed. In this paper, we will investigate various ideas for dealing with this issue and present results showing the properties of the various schemes investigated. © 2011 IEEE.

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TYPE Conference YEAR 2011
ScopusOSTI
Results 51–75 of 173
Results 51–75 of 173