A. Critchley

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Self-magnetic-pinched diode behavior at 1.5-2 MV was diagnosed using a variety of electrical, radiation, and optical diagnostics. Results are compared with predictions of the LSP particle-in-cell code, and shown to be in good agreement. A practical diagnostic of electron incidence angles is demonstrated. A quadrature interferometer is shown to be capable of(More)
The self magnetic pinch diode is being considered as a possible source for future high voltage (10MV) flash radiographic systems being developed. Previous studies at both the Atomic Weapons Establishment (AWE) Aldermaston in the UK and Sandia National Labs (SNL) in the US have investigated the time integrated dose and source diameter produced by the diode.(More)
Summary form only given: A series of experiments were conducted at Sandia National Laboratories on the RITS-6 accelerator configured in the low impedance mode (7.5 MV, 180 kA) to investigate electrode plasma formation and propagation in relativistic electron beam diodes used for flash x-ray radiography. In particular the Self- Magnetic Pinch diode (SMP),(More)
This paper describes the setup, operation, data analysis procedures, and data results of a two-color (lambdaldr = 532 nm and lambdaldr = 1064 nm) quadrature laser interferometer used for the measurement of plasma densities produced by diverse x-ray diodes driven by the RITS-3 generator at Sandia National Laboratories. The nominal non-amplified signal(More)
Self-magnetic-pinched diode behavior at 1.5-2 MV was diagnosed using a variety of electrical, radiation, and optical diagnostics. Results are compared with LSP code predictions. Good code-experiment agreement is observed for the most part. A practical diagnostic of electron incidence angles is demonstrated. Optical measurements show the importance of the(More)
Summary form only given. A two-color, two-chord, quadrature, Mach-Zehnder interferometer is being applied to radiographic diode studies conducted on the high-impedance Mercury pulsed-power generator. The two interferometer chords are positioned independently, so that the more sensitive chord at 1064 nm can be used to probe regions of lower density than the(More)
Summary form only given. Optical emission diagnostics have been used to observe self- magnetic pinch X-ray radiography diodes during operation on the RITS-6 accelerator (11 MV, 150 kA) at Sandia National Laboratories (SNL). Studies of this type inform flash X-ray radiography diode research from which an improved understanding of diode behavior and X-ray(More)
The self-magnetic pinch diode is currently fielded on the RITS-6 accelerator at Sandia National Laboratories operating between 7-12 MV and is the leading candidate for future radiographic source development at the Atomic Weapons Establishment. The diode is capable of producing sub 3-mm radiation spot sizes and greater than 350 Rads measured at 1m. Complex(More)
To answer future needs the CEA is working on new design of flash X-ray radiographic machines. As complements to the operational AIRIX induction linac, these accelerators should deliver several tens of rads in the range of 8-10 Me V during 50 ns. Recent developments of electron diodes have shown the potentiality of a pulsed power driven source to produce the(More)
To meet the future resolution targets for radiography of hydrodynamic experiments at A WE, the Hydrodynamics Department is creating a dedicated Diode Research Facility (DRF). To perform low impedance diode research (self and rod pinch diodes), the X-ray simulator Eros has been acquired. To drive the high impedance diodes (paraxial and immersed Bz) the EMU(More)
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