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2012

Tech. Phys.

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The results of a study of the generation of a gigawatt level pulsed ion beam formed by a diode with an explosive emission potential electrode in self magnetic insulation mode are presented. The experiments have been performed on the TEMP 4M ion accelerator operating in double pulse formation mode: the first pulse is negative polarity (300-500 ns, 100-150 kV) and the second is positive (150 ns, 250-300 kV). The ion current density is 20-40 A/cm 2 ; the beam consists of protons and carbon ions. To increase the efficiency of the ion current generation, a circular geometry diode is proposed. It is shown that with the new design, the plasma is effectively formed over the entire working surface of the graphite potential electrode. During ion beam generation, magnetic insulation of the electrons is achieved over the entire length of the diode (B/B cr ≥ 3). Because of the high drift velocity, the transit time of electrons in the anode-cathode gap is 3-5 ns, whilst the transit time of C + carbon ions exceeds 8 ns. This indicates low efficiency self magnetic insulation for this geometry of diode. At the same time, it has been observed experimentally that during ion current generation (the second pulse), the electron component of the total current is suppressed by a factor of 4-5. A new mech anism of limiting the electron emission, which explains the decrease in the electron component of the total current in the circular diode with self magnetic insulation, is proposed.

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Section: Methodsmentioning

confidence: 99%

Circular ion diode with self-magnetic insulation

2012

Tech. Phys.

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“…The studies were performed on the ТЕМП 4M accelerator [5,6] configured in the double pulse mode: (i) the first pulse is negative (300-500 ns, 100-150 kV) and (ii) the second pulse is positive (150 ns, 250-300 kV). The beam consists of carbon ions (85%) and protons, the energy density on the target is 0.2-3.0 J/cm 2 (for various diodes), and the pulse repetition rate is 5-10 pulses/min.…”

Section: Measurement Procedures Of the Pib Energy Density Distributionmentioning

confidence: 99%

Thermal imaging diagnostics of powerful ion beams

2013

Instrum Exp Tech

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“…This technical solution significantly simplifies the design and increases the reliability of high power ion beam sources. Unfortunately, the efficiency of ion beam generation in self magnetically insulated diodes does not exceed 10-15%, which significantly restricts their use [5].The present study was aimed at elucidating the mechanism of electron current suppression in self magnetically insulated ion diodes.The investigations were carried out on a TEMP 4M accelerator [6], which operated in a double pulse regime. The first (negative) pulse had a duration of 300-500 ns at a voltage of 100-150 kV, and the second (positive) pulse had a duration of 150 ns at 250-300 kV.…”

mentioning

confidence: 99%

“…The investigations were carried out on a TEMP 4M accelerator [6], which operated in a double pulse regime. The first (negative) pulse had a duration of 300-500 ns at a voltage of 100-150 kV, and the second (positive) pulse had a duration of 150 ns at 250-300 kV.…”

mentioning

confidence: 99%

Mechanism of electron current suppression in self-magnetically-insulated ion diode

2012

Tech. Phys. Lett.

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