Investigation of the Self Magnetic Pinch Diode on PIM as a Radiographic Source

Clough, S.G.; Thomas, K.J.; Williamson, Mark; Jones, Aled

doi:10.1109/ppc.2005.300537

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…[1][2][3][4][5][6][7][8] The SMP diode comprises a hollow cylindrical cathode emitting electrons toward a high Z material anode. The initial flow is space charge limited and the electrons strike the target over a large area.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of self magnetic pinch diode as flash radiography source at 4 megavolt

et al. 2013

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The Self Magnetic Pinch (SMP) diode is a potential high-brightness X-ray source for high voltage generators (2-10 MV) that has shown good reliability for flash radiography applications [D. D. Hinchelwood et al., "High power self-pinch diode experiments for radiographic applications" IEEE Trans. Plasma Sci. 35(3), 565-572 (2007)]. We have studied this diode at about 4 MV, driven by the ASTERIX generator operated at the CEA/GRAMAT [G. Raboisson et al., "ASTERIX, a high intensity X-ray generator," in Proceedings of the 7th IEEE Pulsed Power Conference (1989), pp. 567-570]. This generator, made up of a capacitor bank and a Blumlein line, was initially designed to test the behavior of electronic devices under irradiation. In our experiments, the vacuum diode is modified in order to set up flash radiographic diodes. A previous set of radiographic experiments was carried out on ASTERIX with a Negative Polarity Rod Pinch (NPRP) diode [B. Etchessahar et al., "Study and optimization of negative polarity rod pinch diode as flash radiography source at 4.5 MV," Phys. Plasmas 19 (9), 093104 (2012)]. The SMP diode which is examined in the present study provides an alternative operating point on the same generator and a different radiographic performance: 142 6 11 rad at 1 m dose (Al) for a 3.46 6 0.42 mm spot size (1.4Â FWHM of the LSF). This performance is obtained in a reproducible and robust nominal configuration. However, several parametric variations were also tested, such as cathode diameter and anode/cathode gap. They showed that an even better performance is accessible after optimization, in particular, a smaller spot size (<3 mm). Numbers of electrical, optical, and X-ray diagnostics have been implemented in order to gain more insight in the diode physics and to optimize it further. For the first time in France, visible and laser imaging of the SMP diode has been realized, from a radial point of view, thus, providing key information on the electrode plasmas evolution, responsible for the gap closure. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Experimental study of self magnetic pinch diode as flash radiography source at 4 megavolt

et al. 2013

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“…Paraxial diodes are disadvantageous because of their complicated structure and large focal spots (diameter=4-6 mm), and their impedance is than that of rod pinch or self pinch diodes [9]. Self-magnetic pinch diodes (SMPD), which can achieve high radiation dosage (hundreds of rad) and small focal spots (approximately 2 mm) at high voltages (>10 MV), have been examined in current theoretical and application studies to satisfy the requirements of flash radiography for thick materials with high atomic numbers [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…AWE (Atomic Weapons Establishment) examined the principle of SMPD on a prototype IVA module (PIM) accelerator, investigated the effects of the structural parameters of SMPD on radiation dosage and focal spot size at 1-3 MV, and obtained 2-5 mm focal spots and 4-10 rad at 1 m [10,11]. In 2003, the diode structure was optimized, SMPD was driven by Mogul D, and 54 rad at 1 m and 2.1 mm focal spots were obtained at 4.2 MV.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental research on a self-magnetic pinch diode under MV

Zhang

Yang

Sun

et al. 2017

Plasma Sci. Technol.

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A self-magnetic pinch diode (SMPD) integrating an anode foil-reinforced electron beam pinch focus and a small high-dose x-ray spot output was designed and optimized. An x-ray focal spot measuring system was developed in accordance with the principle of pinhole imaging. The designed SMPD and the corresponding measuring system were tested under ∼MV, with 1.75×2 mm 2 oval x-ray spots (AWE defined) and forward directed dose 1.6 rad at 1 m. Results confirmed that the anode foil can significantly strengthen the electron beam pinch focus, and the focal spot measuring system can collect clear focal spot images. This finding indicated that the principle and method are feasible.

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