Development of a 4 MV Laser-Triggered Multi-Stage Switch

Li, Hongtao; Deng, Jianjun; Wang, Yujuan; Shi, Feng; Xie, Weiping; Ding, Bonan

doi:10.1088/1009-0630/10/2/20

Cited by 7 publications

(5 citation statements)

References 11 publications

(8 reference statements)

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“…The maximum output energy of the laser is higher than 100 mJ. Each laser is divided into two beams and used to trigger two adjacent switches in the same layer [27,28]. The jitter of the LTGS is less than 1.5 ns.…”

Section: The Pts Facility and Its Full Circuit Modelmentioning

confidence: 99%

“…The Z [24], the Primary Test Stand (PTS) [25][26][27][28] and the Angara-5-1 [29] research groups all have used exclusive codes to investigate accelerator power flow by introducing theoretical concepts for magnetic insulation or magnetohydrodynamic (MHD) models for the load [30]. In those codes, an incident wave or equivalent voltage source at the boundaries of the MITL is often used to drive an equivalent circuit thereafter.…”

Section: Introductionmentioning

confidence: 99%

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Full circuit calculation for electromagnetic pulse transmission in a high current facility

Zou

Guo

Lin

et al. 2014

Phys. Rev. ST Accel. Beams

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We describe herein for the first time a full circuit model for electromagnetic pulse transmission in the Primary Test Stand (PTS)-the first TW class pulsed power driver in China. The PTS is designed to generate 8-10 MA current into a z-pinch load in nearly 90 ns rise time for inertial confinement fusion and other high energy density physics research. The PTS facility has four conical magnetic insulation transmission lines, in which electron current loss exists during the establishment of magnetic insulation. At the same time, equivalent resistance of switches and equivalent inductance of pinch changes with time. However, none of these models are included in a commercially developed circuit code so far. Therefore, in order to characterize the electromagnetic transmission process in the PTS, a full circuit model, in which switch resistance, magnetic insulation transmission line current loss and a time-dependent load can be taken into account, was developed. Circuit topology and an equivalent circuit model of the facility were introduced. Pulse transmission calculation of shot 0057 was demonstrated with the corresponding code FAST (full-circuit analysis and simulation tool) by setting controllable parameters the same as in the experiment. Preliminary full circuit simulation results for electromagnetic pulse transmission to the load are presented. Although divergences exist between calculated and experimentally obtained waveforms before the vacuum section, consistency with load current is satisfactory, especially at the rising edge.

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Section: The Pts Facility and Its Full Circuit Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Full circuit calculation for electromagnetic pulse transmission in a high current facility

Zou

Guo

Lin

et al. 2014

Phys. Rev. ST Accel. Beams

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“…Several researchers have studied the influence of the mixing ratio on t d and σ d in various SF 6 admixture. Previous research has revealed that with rise in j(SF 6 ) the t d and σ d exhibits an increasing trend [6][7][8]. Chen et al [9] reported that σ d can be improved by manipulating the switch gas temperature and by adding a beta emitter such as Kr 85 isotope.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

Kumar,

Verma,

Singh

et al. 2023

Eng. Res. Express

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Pressurized sparkgap switch is one of the major components that is most commonly used in various pulsed-power systems and the stochastic closure time delay (t d ) and jitter (σ d ) in this gas discharge switch has substantial effect on the temporal characteristics of output pulse. Experimental investigations performed with various volumetric concentrations of SF6 in SF6-N2, SF6-dry air and SF6-Ar admixtures evidenced that the intrinsic parameters of the switch such as time delay and jitter were found to be strongly dependent on the nature of gas, volumetric concentration of SF6 in admixture and rate of rise of voltage (dV/dT) of applied trigger pulse for e.g. in SF6/N2 admixture experiments as the concentration of SF6 was increased from 5% to 50% the average time delay and jitter was consequently increased from 278 ns to 413 ns and 17 ns to 56 ns, respectively. The similar increasing trend was observed even in SF6/dry air and SF6/Ar admixture experiments. It was also observed in the investigation that the variation in time delay and jitter is relatively much lesser for the condition when fast rising trigger pulse having slew rates ∼500 V ns−1 is applied than that of trigger pulse with lower dV/dT of ∼3 V ns−1. To further corroborate the stochasticity of streamer discharge in experimented SF6 admixtures, numerical studies have also been carried out by using a Particle-In-Cell/Monte Carlo Collision (PIC/MCC) model. Our experimental and simulation results infer that SF6/Ar admixture with low SF6 concentration is a superior alternative than pure SF6 for pulsed power switching applications.

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“…In the Marx based scheme, each facility module will generate a current of 0.4-1 MA. This means that the main switch, for example the laser triggered gas switch (LTGS) [20,21] will suffer very large Coulomb and serious electrode erosion in every shot. Lifetime of the LTGS is estimated to be hundreds of shots, which prevents it being used in rep-rate drivers.…”

Section: Introductionmentioning

confidence: 99%

Development of a fusion-oriented pulsed power module

Lin¹,

Zou²,

Zhou³

et al. 2019

Phys. Rev. Accel. Beams

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We present a fusion-oriented pulsed power module M-50, which is based on the linear transformer driver (LTD) and magnetically insulated inductive voltage adder (MIVA) technologies. The module M-50, which consists of 50 identical LTD cavities connected in series, is one of the 60 modules of a fusion-scale pulsed power facility. M-50 is a comprehensive test bed for LTD integration and engineering validation. Each cavity consists of 32 bricks and has an output capability of 90 kV=1.0 MA=120 ns to the matched load. The output power of the 50 cavities is added with a MIVA, whose operation impedance is approximately matched to both source and load. Therefore, it has a nominal output capability of 4.5 MV=1.0 MA=120 ns to 4.5 Ω resistive load. The module is divided into five groups, and each group has ten cavities in series. The inner stalk of the MIVA is divided into five main straight segments. Conical transitions are employed to connect adjacent straight segments. The output end of M-50 is shrunk and connected a ring-cathode diode, whose cathode and anode radii are identical to those of a 12-m-long transmission line in the fusion facility. In this paper, the general concept of the fusion accelerator, the physical design, engineering design and development progress of M-50 are described for the first time.

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Development of a 4 MV Laser-Triggered Multi-Stage Switch

Cited by 7 publications

References 11 publications

Full circuit calculation for electromagnetic pulse transmission in a high current facility

Full circuit calculation for electromagnetic pulse transmission in a high current facility

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

Development of a fusion-oriented pulsed power module

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Development of a 4 MV Laser-Triggered Multi-Stage Switch

Cited by 7 publications

References 11 publications

Full circuit calculation for electromagnetic pulse transmission in a high current facility

Full circuit calculation for electromagnetic pulse transmission in a high current facility

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF6 admixtures

Development of a fusion-oriented pulsed power module

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Product

Resources

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An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures