Frequency compensation for resistive voltage divider using specially shaped inner conductor

Shi, Huantong; Chen, Ziwei; Wu, Jian; Li, Xingwen

doi:10.1063/1.5119959

Cited by 7 publications

(14 citation statements)

References 13 publications

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“…The total current of the Z-pinch plasma was diagnosed through a Rogowski coil located at the bottom of the load [28]. At the same time, the anode voltage was recorded using a resistive divider [29]. Additionally, a narrow-band filter with a bandwidth of 10 nm and an aperture was placed in front of the camera to achieve frequency and spatial filtering.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of the magnetic field and current distribution in double-wire Z-pinch

Jiang

Wang

et al. 2023

Plasma Phys. Control. Fusion

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In this paper, two-dimensional magnetic field structure of a double-wire Z-pinch during the ablation stage is investigated using Faraday rotation diagnosis. The experimental results intuitively display the two-dimensional magnetic field distribution and reveal the process of the global magnetic field spreading towards the load axis as the ablation progresses. The radial current component is determined based on the axial non-uniformity of the magnetic field structure, which further confirms the two-dimensional current path within the ablation stream. Additionally, the significantly enhanced magnetic field intensity and opposing magnetic field direction on both sides of the precursor plasma column indicate the existence of magnetic reconnection and the current layer within. This process also specifically reveals the current transfer process from the wire to the precursor column.

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Section: Methodsmentioning

confidence: 99%

Experimental study of the magnetic field and current distribution in double-wire Z-pinch

Jiang

Wang

et al. 2023

Plasma Phys. Control. Fusion

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“…A Rogowski coil and a B-dot are used to measure the current and its time differential, respectively. Besides, a resistive divider is installed at the cathode to measure the voltage [15]. The amplitude of the current is 450 kA and the risetime is 450 ns when discharged in ±40 kV charging voltage.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Ablated precursor plasma and evolution of magnetic field of exploding cylindrical thin liner

Zhang¹,

Wu²,

Chen³

et al. 2021

Plasma Phys. Control. Fusion

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The formation of precursor plasma and ablation dynamics of Al thin liner explosion are investigated in this manuscript. The size of 12 mm in diameter, 10 μm in thickness Al liners are exploded on the Qin-1 facility (about 450 ns, 450 kA). An axial laser shadowgraphy and interferometry platform is set up to observe the plasma dynamics inside the liner. To solve the problem that the inside plasma density of the liner cannot be absolutely calibrated due to the lack of a zero plasma density area, we have established a CW laser interference system using a streak camera which can trace the interference lines over time. Low-density (10−7−10−6 g cm−3) precursor plasma is generated from the interior wall and flows towards the center with a velocity of about 150–200 km s−1, thus forming a column with high electron density by accumulation. Simultaneously, a high-density plasma layer flows toward the center at about 10 km s−1. The electron density of the central plasma column rises up rapidly after the precursor reaches the center and achieves 2.5 × 1018 cm−3 at 280 ns after the current starts. To fully understand the process, we have used the resistive magnetohydrodynamic code FLASH to realize a simulation to study interior precursor dynamics. We compared these simulation results with our experiments. Finally, we measured the voltage for the whole process and derived the inductance change and effective current radius. We compared the simulated current density distribution with the experimental result which proves that a considerable amount of current flows through the center plasma column, making the effective radius of current become smaller over time.

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“…125-127), [9], for example, measurements of fast high-voltage pulses are essential for the functionality, e.g., the separation of the ions in a field asymmetric time of flight ion mobility spectrometer (FAT-IMS) [7,10]. For these measurements, a constant transfer function over a wide frequency range is important for precisely measuring the waveforms occurring in the aforementioned applications, consisting of a DC voltage in the kilovolt (kV) range with superimposed fast high voltage pulses [3,11].…”

Section: Introductionmentioning

confidence: 99%

“…The final approach worth mentioning here to acquire a signal containing DC and AC components is described by Shi et al [11]. Their approach uses a ceramic tube resistor with a conductive layer vaporized on the outside and a compensation electrode made of a specially shaped metallic torso inserted inside.…”

Section: Introductionmentioning

confidence: 99%

“…Their approach uses a ceramic tube resistor with a conductive layer vaporized on the outside and a compensation electrode made of a specially shaped metallic torso inserted inside. Through this inserted cone, an almost constant transmission behavior of the resistive voltage divider is achievable up to a frequency of 1 GHz [11]. The maximum achieved input impedance is 250 kΩ, which is still too low for high DC voltages and leads to an excessive distortion of the measurement signal, due to the high input current.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Resistive High-Voltage Probe with Frequency Compensation by Planar Compensation Electrode Integrated in Printed Circuit Board Design

et al. 2022

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Resistive voltage dividers tend to have a highly non-linear transfer function as parasitic and stray capacitances exert an increasing influence with increasing frequency. The non-linear transfer function depends on the topology and resistors used and consists of a low-pass filter with an additional high-pass component in the GHz range. Due to the non-linear transfer function the measured signal differs from the original input signal. Here, we present an improved resistive voltage divider with additional compensation capacities to extend the linear bandwidth. With this new concept, the linear bandwidth is improved from 115 kHz to 88 MHz, while maintaining a DC input impedance of 10 MΩ. For high-voltage insulation and easy manufacturing, surface mounted resistors on a printed circuit board with a compensation electrode on the adjacent side are used. The performance of this resistive voltage divider is demonstrated by measuring a series of high-voltage pulses with an amplitude of 2.5 kVpeak-peak. The measured pulse rise time is about 16 ns, corresponding to an average slew-rate of 150 V/ns. Finally, the developed resistive voltage divider is successfully used to measure fast high-voltage transients required for advanced ion mobility spectrometers with integrated collision induced fragmentation.

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Frequency compensation for resistive voltage divider using specially shaped inner conductor

Cited by 7 publications

References 13 publications

Experimental study of the magnetic field and current distribution in double-wire Z-pinch

Experimental study of the magnetic field and current distribution in double-wire Z-pinch

Ablated precursor plasma and evolution of magnetic field of exploding cylindrical thin liner

Resistive High-Voltage Probe with Frequency Compensation by Planar Compensation Electrode Integrated in Printed Circuit Board Design

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