Breakdown in helium in high-voltage open discharge with subnanosecond current front rise

Schweigert, I. V.; Alexandrov, A. L.; Бохан, П. А.; Zakrevskiy, Dm. E.

doi:10.1134/s1063780x16070096

Cited by 17 publications

(10 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In conclusion, in the experiment and PIC MCC simulations we have studied the influence of different e-e emission yields, pulse voltages and gas pressures on the breakdown time in high voltage pulse discharge in helium. Our previous simulations [12,13] have demonstrated that e-e emission makes the main contribution in the current development on the final stage of breakdown. Therefore we have studied the breakdown with of three types of cathodes which have very different electron yield.…”

Section: Results Of Experimental and Theoretical Studymentioning

confidence: 96%

Effect of secondary electron emission on subnanosecond breakdown in high-voltage pulse discharge

Schweigert

Alexandrov

Гугин

et al. 2017

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

A subnanosecond breakdown in high-voltage pulse discharge is studied in experiment and in kinetic simulations for mid-high pressure in helium. It is shown that the characteristic time of the current growth can be controlled by the secondary electron emission. We test the influence of secondary electron yield on plasma parameters for three types of cathodes made from titanium, silicon carbide and CuAlMg-alloy. By changing the pulse voltage amplitude and gas pressure, the area of existence of subnanosecond breakdown is identified.

show abstract

Section: Results Of Experimental and Theoretical Studymentioning

confidence: 96%

Effect of secondary electron emission on subnanosecond breakdown in high-voltage pulse discharge

Schweigert

Alexandrov

Гугин

et al. 2017

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…As was found, this reaction has significant effect on the breakdown development. The details of physical model and the crossections of described above reactions can be found in publications [9,15,16].…”

Section: -3mentioning

confidence: 99%

“…[9,15,16] the results of kinetic simulation of electron avalanche evolution for the experimental conditions [2,7] were presented. As was shown in [15], the secondary electron emission (SEE) becomes a dominant process in current growth at the final stage of breakdown.…”

Section: -3mentioning

confidence: 99%

Subnanosecond breakdown development in high-voltage pulse discharge: Effect of secondary electron emission

Alexandrov

Schweigert

Zakrevskiy

et al. 2017

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract. A subnanosecond breakdown in high-voltage pulse discharge may be a key tool for superfast commutation of high power devices. The breakdown in high-voltage open discharge at mid-high pressure in helium was studied in experiment and in kinetic simulations. The kinetic model of electron avalanche development was constructed, based on PIC-MCC simulations, including dynamics of electrons, ions and fast helium atoms, produced by ions scattering. Special attention was paid to electron emission processes from cathode, such as: photoemission by Doppler-shifted resonant photons, produced in excitation processes involving fast atoms; electron emission by ions and fast atoms bombardment of cathode; the secondary electron emission (SEE) by hot electrons from bulk plasma. The simulations show that the fast atoms accumulation is the main reason of emission growth at the early stage of breakdown, but at the final stage, when the voltage on plasma gap diminishes, namely the SEE is responsible for subnanosecond rate of current growth. It was shown that the characteristic time of the current growth can be controlled by the SEE yield. The influence of SEE yield for three types of cathode material (titanium, SiC, and CuAlMg-alloy) was tested. By changing the pulse voltage amplitude and gas pressure, the area of existence of subnanosecond breakdown is identified. It is shown that in discharge with SiC and CuAlMg-alloy cathodes (which have enhanced SEE) the current can increase with a subnanosecond characteristic time value as small as τ s = 0.4 ns, for the pulse voltage amplitude of 5÷12 kV. An increase of gas pressure from 15 Torr to 30 Torr essentially decreases the time of of current front growth, whereas the pulse voltage variation weakly affects the results.

show abstract

“…Модификация заключается в том, что при бомбардировке катода, например, ионами гелия с энергией ∼ 150 eV концентрация атомов гелия в поверхностном слое в типичных газоразрядных условиях достигает плотности атомов в жидком гелии [2,3]. Эти результаты привели к переоценке роли фотоэмиссии в газовом разряде [4][5][6][7] и в конечном итоге к реализации быстродействующих ключей на основе открытого разряда с гелиевым заполнением -кивотронов [8]. В то же время известны работы, авторы которых придерживаются другой точки зрения.…”

unclassified

“…Особенности механизмов горения приводят к различающимся зависимостям времени коммутации от давления газа. В гелии время коммутации τ s ∝ 1/ p Не по крайней мере до величины τ s ≈ 100 ps [7], в то время как для O 2 и N 2 уменьшение τ s прекращается при давлении газа ∼ 2.5−3 Torr (рис. 2, a, b).…”

unclassified

Коммутация Высоковольтных Импульсов В Устройствах На Основе Открытого Разряда В Азоте И Кислороде

Бохан¹,

Гугин²,

Zakrevskĭi³

et al. 2020

Письма В Журнал Технической Физики

View full text Add to dashboard Cite

Comparative studies of the switching characteristics of devices based on an open discharge - kivotrons in molecular gases (nitrogen and oxygen), as well as their mixtures with helium - have been carried out. The choice of nitrogen and oxygen is due to the fact that the emission coefficients of electrons under the action of their heavy particles are much higher than for helium. It is shown that for this case, as well as with the predominance of the photoelectronic emission mechanism in helium, it is also possible to create fast switches. Their advantage is significantly lower requirements for the cleanliness of the working environment.

show abstract

Breakdown in helium in high-voltage open discharge with subnanosecond current front rise

Cited by 17 publications

References 36 publications

Effect of secondary electron emission on subnanosecond breakdown in high-voltage pulse discharge

Effect of secondary electron emission on subnanosecond breakdown in high-voltage pulse discharge

Subnanosecond breakdown development in high-voltage pulse discharge: Effect of secondary electron emission

Коммутация Высоковольтных Импульсов В Устройствах На Основе Открытого Разряда В Азоте И Кислороде

Contact Info

Product

Resources

About