Control of parameters of micropinches formed in current-carrying plasma jet

Korobkin, Yu. V.; Paperny, V. L.; Romanov, I. V.; Rupasov, A. A.; Shikanov, A. S.

doi:10.1016/j.physleta.2007.09.016

Cited by 5 publications

(1 citation statement)

References 11 publications

(19 reference statements)

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“…Ранее в вакуумном разряде малой мощности с лазерным поджигом (ток ∼ 10 kA, напряжение до 20 kV) авторами были обнаружены эффекты формирования микропинчевых структур, генерации пучков электронов [8], а также зарегистрированы пучки аномально ускоренных ионов [9]. В настоящей работе впервые проведены измерения характеристик эмитируемых разрядом электронных пучков в широком диапазоне энергий лазерного импульса с целью выяснения возможности реализации механизма аномального ускорения электронов в данных экспериментальных условиях и установления особенно-стей этого механизма, в частности связи характеристик пучков с условиями инициирования разряда.…”

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Пучки Аномально Ускоренных Электронов, Эмитируемые Плазмой Вакуумного Разряда С Лазерным Поджигом

Романов¹,

Паперный²,

Кологривов³

et al. 2021

Письма В Журнал Технической Физики

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It is shown experimentally that a low-power pinch vacuum discharge with laser ignition can emit a beam of abnormally accelerated electrons with maximum energies per unit charge, almost an order of magnitude higher than the voltage across the discharge gap. It is established that the intensity of the X-ray radiation generated by the action of the beam on the target significantly decreases with increasing laser pulse energy. Maximum energy of X-ray quanta is inversely proportional to the mass of the cathode material ablated by laser radiation when the discharge is ignited. Possible mechanisms of the electron beam generation process are discussed.

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Пучки Аномально Ускоренных Электронов, Эмитируемые Плазмой Вакуумного Разряда С Лазерным Поджигом

Романов¹,

Паперный²,

Кологривов³

et al. 2021

Письма В Журнал Технической Физики

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Energy distributions of highly charged ions escaping from a plasma via a low-voltage laser-induced discharge

Romanov¹,

Rupasov²,

Shikanov³

et al. 2010

J. Phys. D: Appl. Phys.

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The results of experimental studies of ion beams escaping from both a laser-produced plasma and a plasma of laser-induced vacuum discharge are presented. The parameters of the discharge with an Al cathode are as follows: current amplitude is about 1.7 kA and current rise rate is about 7.5 × 109 A s−1 as the capacitor voltage is 2.3 kV. The discharge is initiated with a laser pulse of 30 ps length, energy less than 10 mJ and power density I L = 5 × 1011 W cm−2. It is shown that the discharge is a source of accelerated and highly charged ions of the cathode material. The production of Al ions is observed at the instant when the discharge current rise rate attains a peak value and just at that same instant a pinching occurs in front of the cathode jet expanding into the interelectrode gap. Ion energy distributions are characterized by the presence of a significant non-Maxwellian tail of the accelerated ions. The maximum ion charge state and energy per charge unit are +8 and 13 keV/Z, respectively. The energy is comparable to the value observed under similar experimental conditions for the laser-produced plasma at a pulse energy of 400 mJ and power density I L = 2 × 1013 W cm−2.

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Micropinches in laser induced moderate power vacuum discharge

Korobkin

Paperny

Romanov

et al. 2008

Plasma Phys. Control. Fusion

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Studies of x-ray emission from a laser induced vacuum discharge of moderate storage energy (<20 J) are examined. It is found that micropinches in the initial stage of the cathode jet expansion into the interelectrode gap are formed. Hot plasma of the micropinches emits a soft x-ray radiation and beams of accelerated electrons moving toward the anode. It is found that these phenomena occur just when both amplitude of the discharge current and energy of the initiating laser pulse lie in the specified ranges of values. The position of the micropinch within the interelectrode gap and also the intensity of the x-ray radiation and beams of the accelerated electrons emitted from the micropinch are variable over a wide range of values through changes in energy of the laser pulse and/or amplitude of the discharge current. The experimental results are compared with the data of the particle-in-cell simulations and a fair agreement is found between them.

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Control of parameters of micropinches formed in current-carrying plasma jet

Cited by 5 publications

References 11 publications

Пучки Аномально Ускоренных Электронов, Эмитируемые Плазмой Вакуумного Разряда С Лазерным Поджигом

Пучки Аномально Ускоренных Электронов, Эмитируемые Плазмой Вакуумного Разряда С Лазерным Поджигом

Energy distributions of highly charged ions escaping from a plasma via a low-voltage laser-induced discharge

Micropinches in laser induced moderate power vacuum discharge

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