Radiographic results for the rod-pinch diode scaled up to 6 MV

Young, F.C.; Commisse, R.J.; Allen, R.J.; Mosher, D.; Swanekamp, S. B.; 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.

doi:10.1109/ppc.2003.1277975

Cited by 5 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured dose increases with angle and the dose at large angles is sufficient to cause saturation effects in the pin diodes [19]. There is no evidence of saturation effects in the smaller signals from the detector at 20 .…”

Section: Analysis Of Asterix Angular Dose-rate Measurementsmentioning

confidence: 91%

“…For the ASTERIX experiments, [19]- [21] tungsten or gold anode rods of 1.0-, 1.6-, 2.0-, and 3.0-mm diameter are used with ranging from 11 to 16. The anode rod extends 16 mm beyond the 3-mm-thick cathode annulus and, for most shots, is tapered to a point over the last 10 mm.…”

Section: Analysis Of Asterix Angular Dose-rate Measurementsmentioning

confidence: 99%

“…The silicon pin diodes, mounted in lead collimators, provide time histories of the radiation. These radiation diagnostics are described in more detail in [19].…”

Section: Analysis Of Asterix Angular Dose-rate Measurementsmentioning

confidence: 99%

“…An intense X-ray source is formed at the rod tip with a spot size comparable to the diameter of the rod when viewed along the axis of the rod. [15] Recent RPD experiments on the ASTERIX generator at the Centre d'Etudes de Gramat (CEG) in France have produced 35 rad(air) at 6 MV in a 2-mm-diameter spot [19], [20]. The uniformly filled-circle definition of spot size developed by AWE is used throughout this article [8].…”

mentioning

confidence: 99%

See 3 more Smart Citations

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Analysis Of Asterix Angular Dose-rate Measurementsmentioning

confidence: 91%

Section: Analysis Of Asterix Angular Dose-rate Measurementsmentioning

confidence: 99%

“…The silicon pin diodes, mounted in lead collimators, provide time histories of the radiation. These radiation diagnostics are described in more detail in [19].…”

Section: Analysis Of Asterix Angular Dose-rate Measurementsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations