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

Zou, Wenkang; Guo, Fan; Lin, Changxing; Song, Seungwoo; Wang, Meng; Xie, Weiping; Deng, Jianjun

doi:10.1103/physrevstab.17.110401

Cited by 22 publications

(8 citation statements)

References 19 publications

(23 reference statements)

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“…Great works were also done on small devices with peak current about 1MA or less, such as the MAGPIE [30] in the Imperial College, the Qiangguang-I facility in the Northwest Institute of Nuclear Technology [11,12], and the PPG-I in the Tsinghua university [14]. The new generation driver of China, 10MA PTS facility [15][16][17], was founded in 2013, based on which a series of theoretical and experimental work were carried out for the Z pinch and ZPDH studies.…”

Section: Pulsed Power System and Circuit Modelingmentioning

confidence: 99%

“…As the pulse width is shortened, the power increases, and finally a 100ns wide, tens of MA current is formed in the load region. Since the Z-pinch implosion is strongly coupled to the generator, circuit models [11,16,17,31] were setup and coupled with RMHD models to get the integrated simulation from generator discharge to the Z-pinch implosion and radiation. Thus, circuit simulation is not only an important tool for the driver design, operation and maintenance, but also an effective means for experimental design and analysis.…”

Section: Pulsed Power System and Circuit Modelingmentioning

confidence: 99%

“…Several low current generators, such as the Qiangguang-I facility in the Northwest Institute of Nuclear Technology [11,12], the Yang facility in the institute of Fluid Physics [13], and the PPG-I facility in the Tsinghua university [14], have been setup and used for Z-pinch studies. Currently, the ∼8MA PTS facility in China has been completed, which provides a powerful experimental platform of relatively large M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT drive current for researches of ZPDH [15][16][17]. Since 2000, the remarkable development of Z pinch physics attracted our attention, and a research team focusing on the theoretical and numerical study of Z pinch and Z-pinch drive ICF was founded in the Institute of applied physics and computational mathematics (IAPCM).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM

Ding

Zhang

Xiao

et al. 2016

Matter and Radiation at Extremes

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Dense Z-pinch plasmas are powerful and energy-efficient laboratory sources of x rays, and show the possibility to drive inertial confinement fusion (ICF). Recent advances in wire-array Z-pinch and Z-pinch dynamic hohlraum (ZPDH) researches at the Institute of Applied Physics and Computational Mathematics are presented in this paper. Models are setup to study different physical processes. A full circuit model (FCM) was used to study the coupling between Z-pinch implosion and generator discharge. A mass injection model with azimuthal modulation was setup to simulate the wire-array plasma initiation, and the two-dimensional MHD code MARED was developed to investigate the Z-pinch implosion, MRT instability, stagnation and radiation. Implosions of nested and quasispherical wire array were also investigated theoretically and numerically. Key processes of ZPDH, such as the array-foam interaction, formation of the hohlraum radiation, as well as the following capsule ablation and implosion, were analyzed with different radiation magneto-hydrodynamics (RMHD) codes. An integrated 2D RMHD simulation of dynamic hohlraum driven capsule implosion provides us the physical insights of wire-array plasma acceleration, shock generation and propagation, hohlraum formation, radiation ablation, and fuel compression.

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Section: Pulsed Power System and Circuit Modelingmentioning

confidence: 99%

Section: Pulsed Power System and Circuit Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM

Ding

Zhang

Xiao

et al. 2016

Matter and Radiation at Extremes

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“…The correction monotonically decreases the loss current from the space-charge-limited current to zero as the magnetic field approaches and exceeds the cutoff magnetic field, similar to the corrections described in Refs. [26,27]. In the circuit model of the Z accelerator, the results are not sensitive to the exact form of the correction because the MITLs become magnetically insulated early in the pulse, and the electron losses prior to magnetic insulation are negligible.…”

Section: B Electron Loss Prior To Magnetic Insulationmentioning

confidence: 99%

Transmission-line-circuit model of an 85-TW, 25-MA pulsed-power accelerator

Hutsel

Corcoran

Cuneo

et al. 2018

Phys. Rev. Accel. Beams

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We have developed a physics-based transmission-line-circuit model of the Z pulsed-power accelerator. The 33-m-diameter Z machine generates a peak electrical power as high as 85 TW, and delivers as much as 25 MA to a physics load. The circuit model is used to design and analyze experiments conducted on Z. The model consists of 36 networks of transmission-line-circuit elements and resistors that represent each of Zs 36 modules. The model of each module includes a Marx generator, intermediate-energy-storage capacitor, laser-triggered gas switch, pulse-forming line, self-break water switches, and tri-plate transmission lines. The circuit model also includes elements that represent Zs water convolute, vacuum insulator stack, four parallel outer magnetically insulated vacuum transmission lines (MITLs), double-post-hole vacuum convolute, inner vacuum MITL, and physics load. Within the vacuum-transmission-line system the model conducts analytic calculations of current loss. To calculate the loss, the model simulates the following processes: (i) electron emission from MITL cathode surfaces wherever an electric-field threshold has been exceeded; (ii) electron loss in the MITLs before magnetic insulation has been established; (iii) flow of electrons emitted by the outer-MITL cathodes after insulation has been established; (iv) closure of MITL anode-cathode (AK) gaps due to expansion of cathode plasma; (v) energy loss to MITL conductors operated at high lineal current densities; (vi) heating of MITL-anode surfaces due to conduction current and deposition of electron kinetic energy; (vii) negative-space-charge-enhanced ion emission from MITL anode surfaces wherever an anode-surface-temperature threshold has been exceeded; and (viii) closure of MITL AK gaps due to expansion of anode plasma. The circuit model is expected to be most accurate when the fractional current loss is small. We have performed circuit simulations of 52 Z experiments conducted with a variety of accelerator configurations and load-impedance time histories. For these experiments, the apparent fractional current loss varies from 0% to 20%. Results of the circuit simulations agree with data acquired on 52 shots to within 2%.

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“…Circuit simulation tools are usually used to estimate the operating parameters such as peak voltage, pulse duration and amplitude of conduction current for each component in the induction cavity [21,22]. They provide the designing criteria for each component.…”

Section: Introductionmentioning

confidence: 99%

Modeling power flow in the induction cavity with a two dimensional circuit simulation

Guo

Zou

Gong

et al. 2017

Phys. Rev. Accel. Beams

Self Cite

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We have proposed a two dimensional (2D) circuit model of induction cavity. The oil elbow and azimuthal transmission line are modeled with one dimensional transmission line elements, while 2D transmission line elements are employed to represent the regions inward the azimuthal transmission line. The voltage waveforms obtained by 2D circuit simulation and transient electromagnetic simulation are compared, which shows satisfactory agreement. The influence of impedance mismatch on the power flow condition in the induction cavity is investigated with this 2D circuit model. The simulation results indicate that the peak value of load voltage approaches the maximum if the azimuthal transmission line roughly matches the pulse forming section. The amplitude of output transmission line voltage is strongly influenced by its impedance, but the peak value of load voltage is insensitive to the actual output transmission line impedance. When the load impedance raises, the voltage across the dummy load increases, and the pulse duration at the oil elbow inlet and insulator stack regions also slightly increase.

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

Cited by 22 publications

References 19 publications

Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM

Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM

Transmission-line-circuit model of an 85-TW, 25-MA pulsed-power accelerator

Modeling power flow in the induction cavity with a two dimensional circuit simulation

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