Prefire probability of the switch type Fast LTD

Kim, A.; Фролов, С. В.; Alexeenko, V. M.; Sinebryukhov, V.A.; Mazarakis, M.G.; Bayol, F.

doi:10.1109/ppc.2009.5386341

Cited by 32 publications

(5 citation statements)

References 3 publications

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“…В ИСЭ СО РАН для ЛТД ступени с масляным заполнением используется ЛТД разрядник, конструкция которого описана в [10]. Данный разрядник имеет шесть идентичных зазоров длиной 6 мм каждый и рассчитан на двуполярное напряжение ±100 кВ.…”

Section: Matedunclassified

Численная Модель Единичного Зазора ЛТД Разрядника

Алексеенко,

Кондратьев,

Синебрюхов

et al. 2023

MTD

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ЛТД генератор является перспективным направлением развития мощной импульсной техники. Одной из ключевых особенностей ЛТД генератора является прямое получение субмикросекундных импульсов, для чего необходимо обеспечить одновременное срабатывание большого количества разрядников. Для моделирования ЛТД генератора с целью изучения возможности оптимизации системы запуска необходима модель разрядника, учитывающая зависимость времени задержки срабатывания от параметров пускового импульса. Для этого разработана численная модель ЛТД разрядника, в которой момент пробоя каждого зазора определяется индивидуально с помощью интегрального критерия. Работоспособность модели подтверждена для одного давления воздуха в разряднике и одной скорости нарастания пускового импульса.Скорость нарастания пускового импульса на пусковом электроде ЛТД разрядника зависит от конфигурации системы запуска ЛТД ступени. Для моделирования различных систем запуска необходимо подтвердить возможность применения интегрального критерия при различной скорости нарастания пускового импульса. Кроме того, рабочее давление в разрядниках в разных ЛТД генераторах может отличаться. В данной работе показана возможность применения интегрального критерия для определения времени пробоя зазора ЛТД разрядника для диапазона скоростей нарастания напряжения от 1,5 до 3,5 кВ/нс и давлении воздуха в разрядниках от 3,5 до 4,0 ата. При этом можно пренебречь зависимостью величины интегрального критерия от скорости нарастания напряжения и давления воздуха.

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Section: Matedunclassified

Численная Модель Единичного Зазора ЛТД Разрядника

Алексеенко,

Кондратьев,

Синебрюхов

et al. 2023

MTD

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“…The Mykonos V LTD module is made up of five, threemeter diameter LTD cavities. Each cavity consists of 36 LTD bricks, each built with a HCEI 200 kV multi-gap switch [19] and two 40 nF General Atomics 31165 capacitors. The five cavities are triggered sequentially and drive a matched impedance coaxial water transmission line.…”

Section: A Pulsed Power Drivermentioning

confidence: 99%

Millimeter-Gap Magnetically Insulated Transmission Line Power Flow Experiments

Hutsel

Stoltzfus

Breden

et al. 2014

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An experiment platform has been designed to study vacuum power flow in magnetically insulated transmission lines (MITLs). The platform is driven by the Mykonos-V LTD accelerator to drive a coaxial MITL with a millimeter-scale anode-cathode gap. The experiments conducted quantify the current loss in the MITL with respect to vacuum pumpdown time and vacuum pressure. MITL gaps between 1.0 mm and 1.3 mm were tested. The experiment results revealed large differences in performance for the 1.0 and 1.3 mm gaps. The 1.0 mm gap resulted in current losses of 40%-60% of the peak current. The 1.3 mm gap resulted in current losses of less than 5% of peak current. Classical MITL models that neglect plasma expansion predict that there should be zero current loss, after magnetic insulation is established, for both of these gaps.

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“…Same-length needles were usually chosen to improve the voltage distribution along the inner surface of the switch chamber, pre-fires were still frequently found during the experiments. KIM et al studied the breakdown characteristics and jitter characteristics of switches in different voltage-equalizing modes, and obtained the conclusion that the breakdown voltage with the needle is lower than the DC breakdown voltage at the same gap [15] 。Jiang Xiaofeng, Jiang Zhanxing and other people also studied the influence of the corona current on the breakdown voltage and jitter of the switch [16][17][18][19][20][21] 。Liu Xianfei analyzed the influence of the insulating gas on the breakdown voltage [22] 。Although many efforts have been made to improve the switching performance, it remains difficult to study the relationship between switch performance and the corona current difference in each gap. Therefore, in this paper, a comparison study of corona discharge current of a multi-gap switch for LTD from the aspects of self-breakdown voltage and jitter is presented.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of corona current on the performance of multi-gap switch

Yan

Huang

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

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Excimer lasers driven by linear transform driver (LTD) are expected to be used in inertial confinement fusion (ICF). The main problem of LTD in excimer lasers is synchronous triggering on multiple circuits, gas spark switches are important for synchronous triggering, which are required to be fired with low prefire probability and jitter. Multi-gap switch, as a kind of the gas spark switches, is always used in LTD. In this paper, a comparison study of corona discharge current of a multi-gap switch for LTD from the aspects of self-breakdown voltage and jitter is presented. The length of equalizingvoltage needle was optimized by the electrical strength simulation. Using the optimized needle, the corona currents of the two gaps were measured, then it was found that the corona currents differ when the lengths of the corona needles were equal. To study if the difference of current in each gap affects the breakdown voltage and jitter of the switch, the length of the needle was adjusted to make the corona current the same. Then the breakdown voltage and jitter were measured under the two conditions of equal and unequal corona currents. It can be found that smaller the difference of current in each gap, higher the breakdown voltage and lower the jitter of the switch. It can be concluded that the corona needle can be adjusted to make corona current of each gap equal, which can be beneficial to increase the breakdown voltage and lower the jitter of the switch.

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Prefire probability of the switch type Fast LTD

Cited by 32 publications

References 3 publications

Численная Модель Единичного Зазора ЛТД Разрядника

Численная Модель Единичного Зазора ЛТД Разрядника

Millimeter-Gap Magnetically Insulated Transmission Line Power Flow Experiments

Study on the influence of corona current on the performance of multi-gap switch

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