Intense ion beam optimization and characterization with infrared imaging

Davis, H.A.; Bartsch, R.R.; Olson, Joseph; Rej, D. J.; Waganaar, W. J.

doi:10.1063/1.365629

Cited by 54 publications

(21 citation statements)

References 14 publications

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“…In our conditions incident beam energy is less then ablation threshold for the stainless steel target, so the ablation is not significant for the ion beam energies below 4 J/cm 2 . This corresponds to the results obtained by Davis et al [17] for a diode with an external magnetic insulation of similar design. As stated in [18] the Faraday cup data agree with the infrared data up to 3 J/cm 2 .…”

Section: Measurement Of the Ion Beam Energy Densitysupporting

confidence: 89%

Experimental evidence of energetic neutrals production in an ion diode

Pushkarev

Isakova

Khaylov

2015

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Measurement Of the Ion Beam Energy Densitysupporting

confidence: 89%

Experimental evidence of energetic neutrals production in an ion diode

Pushkarev

Isakova

Khaylov

2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…When the beam energy density exceeds the ablation threshold of the target, the energy absorbed by the target is less than the incident beam energy because some energy is carried away in the ablated material. 8 This leads to an underestimation of the beam energy density when measured by infrared imaging diagnostic, which also affects the results of statistics. We expect that reduction in the energy density on target so that it does not exceed the ablation threshold of the target would increase the variation in energy density.…”

Section: Resultsmentioning

confidence: 98%

Statistical analysis of the ion beam production in a self magnetically insulated diode

2013

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The paper presents the results of a study on shot to shot variation in energy density of an ion beam formed by a self-magnetically insulated diode with an explosive emission cathode. The experiments were carried out with the TEMP-4M accelerator operating in double-pulse mode: plasma formation occurs during the first pulse (negative polarity, 300-500 ns, 100-150 kV), and ion extraction and acceleration during the second pulse (positive polarity, 150 ns, 250-300 kV). Crucially, it was found that the standard deviation of energy density does not exceed 11%, whilst the same variation for ion current density was 20%-30%, suggesting the presence of neutrals in the beam. This idea is further supported by the fact that ion current density is only weakly dependant on the accelerating voltage and other output parameters of the accelerator (coefficient of determination < 0.3), whilst the correlation between the energy density of the beam and the output parameters is strong (coefficient of determination > 0.9). We attribute the neutral component as being due to charge exchange between accelerated ions and neutral molecules from a neutral layer near the anode surface. Implementation using a self-magnetically insulated diode with an explosive-emission cathode, having an operational lifetime of up to 10 7 shots, has promising prospects for various technological applications. V C 2013 AIP Publishing LLC. [http://dx.

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“…The magnetic induction in the electron drift region (for the diode with magnetic self-insulation) is comparable with the magnetic induction in a diode with an external magnetic insulation, where an efficiency of ion current generation of over 80% of the total current was achieved. 4 Figure 8 shows the results of a study of homogeneity of the electron beam generation in a flat diode.The distribution of energy density was measured by means of a thermal imaging technique 16 adapted to the double-pulse mode. Experimental studies have shown that, in the diode with magnetic self-insulation, the plasma forms effectively on the entire working surface of the potential electrode and the PIB generation is fairly homogeneous.…”

Section: Analysis Of the Change In Magnetic Insulation Over The mentioning

confidence: 99%

Limitation of the electron emission in an ion diode with magnetic self-insulation

2011

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The results of a study of the generation of a pulsed ion beam of gigawatt power formed by a diode with an explosive-emission potential electrode in a mode of magnetic self-insulation are presented. The studies were conducted at the TEMP-4M ion accelerator set in double pulse formation mode: the first pulse was negative (300-500 ns and 100-150 kV) and the second, positive (150 ns and 250-300 kV). The ion current density was 20-40 A=cm 2 ; the beam composition was protons and carbon ions. It was shown that plasma is effectively formed over the entire working surface of the graphite potential electrode. During the ion beam generation, a condition of magnetic cutoff of electrons along the entire length of the diode (B=B cr ! 4) is fulfilled. Because of the high drift rate, the residence time of the electrons and protons in the anode-cathode gap is 3-5 ns, while for the C þ carbon ions, it is more than 8 ns. This denotes low efficiency of magnetic self-insulation in a diode of such a design. At the same time, it has been experimentally observed that, during the generation of ion current (second pulse), the electronic component of the total current is suppressed by a factor of 1.5-2 for a strip diode with plane and focusing geometry. A new model of the effect of limiting the electron emission explaining the decrease in the electronic component of the total current in a diode with magnetic self-insulation is proposed.

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Intense ion beam optimization and characterization with infrared imaging

Cited by 54 publications

References 14 publications

Experimental evidence of energetic neutrals production in an ion diode

Experimental evidence of energetic neutrals production in an ion diode

Statistical analysis of the ion beam production in a self magnetically insulated diode

Limitation of the electron emission in an ion diode with magnetic self-insulation

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