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

Isakova, Yu. I.; Pushkarev, A. I.; Khaylov, I. P.

doi:10.1063/1.4821833

Cited by 4 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The HPIB energy density instability was on average 24% at a diode system ser vice life of <10 pulses. Preliminary studies of the strip focusing diode with an EEC in the self magnetic insula tion mode showed that the SD of the beam energy den sity in a train of 50-100 pulses is at most 10-11% [6].…”

Section: Introductionmentioning

confidence: 99%

The effect of energy stabilization of an ion beam formed by a self-magnetically insulated diode

2015

Self Cite

View full text Add to dashboard Cite

The results of a study of the generation stability of intense pulsed ion beams, which are formed by a self magnetically insulated diode with an explosive emission cathode, are presented. Investigations were conducted using a TEMP 4M accelerator configured to operate in the bipolar pulse mode: the first pulse is negative (300-500 ns, 100-150 kV) and the second is positive (150 ns, 200-250 kV). Diodes of different designs were studied: strip focusing diodes, strip planar diodes, and conical focusing diodes. The total beam energy was measured using both the infrared imaging diagnostics and a conventional calorimeter, while the beam energy density was measured using the infrared imaging and acoustic diagnostics. The anode design was modified to improve the ion beam generation stability. It was obtained that the standard deviation of the total energy and beam energy density in a pulse train does not exceed 10-11% for an amplitude instability of the ion current density pulse of >20-30%. The mechanism of the beam energy density stabilization in a pulse train, which is attributed to the ion charge exchange and formation of accelerated neutrals, is pre sented. The sources of fluctuations in the total energy and ion beam energy density are analyzed. The long service life of ion diodes with self magnetic insulation and an explosive emission cathode (>10 6 pulses) and the high shot to shot beam generation stability make these devices promising for various technological applications.

show abstract

Section: Introductionmentioning

confidence: 99%

The effect of energy stabilization of an ion beam formed by a self-magnetically insulated diode

2015

Self Cite

View full text Add to dashboard Cite

show abstract

Correlation analysis of intense ion beam energy in a self magnetically insulated diode

2014

View full text Add to dashboard Cite

This paper presents the results of a statistical and correlation analysis of the energy and 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, 120 ns, 250–300 kV). Various arrangements of diodes have been investigated: strip focusing and planar diodes, a conical focusing diode and a spiral diode. The total ion beam energy was measured using both a calorimeter and an infrared camera and the beam energy density was measured by the thermal imaging and acoustic diagnostics. The correlation analysis showed that ion current density is only weakly dependent on the accelerating voltage and other output parameters of the accelerator, with the coefficient of determination <0.3. At the same time, in this paper, we have identified that the total energy of the beam and the energy density is strongly dependant on the accelerator output parameters, since the coefficient of determination >0.9. The mechanism governing stabilization of the beam energy density from shot to shot was discovered and attributed to formation of the neutral component in ion beam 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 106 shots, has promising prospects for various technological applications.

show abstract

Stabilization of ion beam generation in a diode with self-magnetic insulation in double-pulse mode

2015

View full text Add to dashboard Cite

The paper presents the results of statistical studies of ion beam generation in different geometry diodes with explosive emission cathode in a mode of self-magnetic insulation. The experiments were carried out using the TEMP-4M pulsed ion beam accelerator during its operation in both unipolar pulse mode (100 ns, 250–300 kV) and bipolar-pulse mode with the first negative (300–600 ns, 100–150 kV) followed by a second positive (120 ns, 250–300 kV) pulse. It is found that the standard deviation of the total energy and energy density of the beam does not exceed 10–11%, while the same shot-to-shot variation in ion current density was found to be 20–30%. The mechanism of the energy density stabilization from pulse to pulse may be associated with the charge exchange between accelerated ions and stationary molecules and formation of accelerated neutrals. We observed a high correlation between the energy density (or total beam energy) and the duration of the first voltage pulse. We performed analysis of Blumlein statistical performance when the Blumlein was terminated with a resistive load and with a self-magnetically insulated ion diode. A characteristic feature of Blumlein operation in the double-pulse mode is an excellent reproducibility of breakdown of the preliminary spark gap, the variation in breakdown voltage is <2%. At the same time, the shot-to-shot variation in the breakdown voltage of the main spark gap in both bipolar- and unipolar pulse mode is 3–4 times higher than that for the preliminary spark gap. To improve the statistical performance of the main spark gap we used the first voltage pulse at the output of Blumlein to trigger the main spark gap. The new trigatron-type regime of the main spark gap operation showed a better reproducibility of the first pulse duration, with the time jitter not exceeding 10 ns in a set of 50 pulses.

show abstract

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

Cited by 4 publications

References 13 publications

The effect of energy stabilization of an ion beam formed by a self-magnetically insulated diode

The effect of energy stabilization of an ion beam formed by a self-magnetically insulated diode

Correlation analysis of intense ion beam energy in a self magnetically insulated diode

Stabilization of ion beam generation in a diode with self-magnetic insulation in double-pulse mode

Contact Info

Product

Resources

About