Characterization of composite rod-pinch-diode radiographic sources at 5 to 6 MV on Asterix

Mosher, D.; Alien, R.J.; Commisse, R.J.; Swanekamp, S. B.; Young, F.C.; Cooperstein, G.; Vermare, C.; Delvaux, J.; Horde, Y.; Merle, E.; Nicolas, R.; Nore, D.; Pierret, O.; Rosol, Y.R.; Tailleur, Y.; Верон, Лаурент; Bayol, F.; Garrigues, A.; Delbos, C.; Nicot, G.; Oliver, B.V.; Rose, D. V.; Rovang, Dean C.; Maenchen, J.E.

doi:10.1109/ppc.2003.1277976

Cited by 1 publication

(1 citation statement)

References 8 publications

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“…A significant fraction of the current flow is also bent around the end of the rod and enters the rod perpendicular to the end. Side viewing X-ray images from the ASTERIX experiments also indicate that a significant fraction of the electrons are concentrated on the end face of the blunt rod [35]. The flow pattern shown in Fig.…”

Section: B Magnetically Limited Regimementioning

confidence: 87%

Evaluation of Self-Magnetically Pinched Diodes up to 10 MV as High-Resolution Flash X-Ray Sources

Swanekamp

Cooperstein

Schumer

et al. 2004

IEEE Trans. Plasma Sci.

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The merits of several high-resolution, pulsed-powerdriven, flash X-ray sources are examined with numerical simulation for voltages up to 10 MV. The charged particle dynamics in these self-magnetically pinched diodes (SMPDs), as well as electron scattering and energy loss in the high-atomic-number target, are treated with the partic by coupling the output from LSP with the two-dimensional component of the integrated tiger series of Monte Carlo electron/photon transport codes, CYLTRAN. The LSP/CYLTRAN model agrees well with angular dose-rate measurements from positive-polarity rod-pinch-diode experiments, where peak voltages ranged from 5.2-6.3 MV. This analysis indicates that, in this voltage range, the dose increases with angle and is a maximum in the direction headed back into the generator. This suggests that high-voltage rod-pinch experiments should be performed in negative polarity to maximize the extracted dose. The benchmarked LSP/CYLTRAN model is then used to examine three attractive negative-polarity diode geometry concepts as possible high-resolution radiography sources for voltages up to 10 MV. For a 2-mm-diameter reentrant rod-pinch diode (RPD), a forward-directed dose of 740 rad(LiF) at 1 m in a 50-ns full-width at half-maximum radiation pulse is predicted. For a 2-mm-diameter nonreentrant RPD, a forward-directed dose of 1270 rad(LiF) is predicted. For both RPDs, the on-axis X-ray spot size is comparable to the rod diameter. A self-similar hydrodynamic model for rod expansion indicates that spot-size growth from hydrodynamic effects should be minimal. For the planar SMPD, a forward-directed dose of 1370 rad(LiF) and a similar X-ray spot size are predicted. These results show that the nonreentrant RPD and the planar SMPD are very attractive candidates for negative-polarity high-resolution X-ray sources for voltages of up to 10 MV.Index Terms-Bremsstrahlung, coupled electron-photon transport, electron beams, flash X-radiography, high-power diodes, ion beams, Monte Carlo, particle-in-cell.

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Section: B Magnetically Limited Regimementioning

confidence: 87%