High voltage generator with fast risetime for EMP simulation

Schilling, H.; Schlüter, Jochen; Peters, M.F.; Nielsen, Rikke Kristine; Naff, J.T.; Hammon, H.G.

doi:10.1109/ppc.1995.599806

Cited by 18 publications

(15 citation statements)

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“…The 'pre-pulse' is a characteristic of displacement current which appears during the charging state of the capacitor (t < τ 0 = 20 ns) when the switch is open. The (20-90)% risetime t r of the main pulse is 1.4 ns -close to the designed value of 1 ns [4]. The negative pulse is a reflection from the resistive sheet termination at z = 10.4 m from the observation point.…”

Section: Resultssupporting

confidence: 72%

“…This has now been modelled by including the dielectric properties of SF 6 gas with losses. Third, using a fine mesh and running the code on an Itanium II 160 processor cluster allows a risetime of 1.4 ns, which is close to the experimental design of 1 ns [4]. Fourth, the interaction of high-power EMP with the human body in presence of a mobile telephone handset is studied.…”

Section: Introductionmentioning

confidence: 83%

“…First, the air-gap parallel-plate capacitor is replaced by a real dielectric compact size parallel-plate capacitor. Second, the narrow region of the tapered section of the simulator is normally pressurized with SF 6 gas [4] to avoid breakdown. This has now been modelled by including the dielectric properties of SF 6 gas with losses.…”

Section: Introductionmentioning

confidence: 99%

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Transient analysis of the human body with a mobile phone subject to intense UWB pulses

Ahmed

Linton

2007

2007 IEEE Antennas and Propagation Society International Symposium

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Self-consistent 3-D FDTD analysis of a bounded-wave EMP simulator with a human model in the presence of a complex electrical environment is performed. The designed EMP simulator could be directly applied to the optimization of EMP for a desired level of the field intensity and risetime in UWB pulsed applications. Using a fine mesh and an Itanium II 160 processor cluster allowed the risetime of 1.4 ns -very close to the experimental design of 1 ns. This study is significantly important for investigating the effects of intense UWB pulses on biological cells. A detailed analysis from the pointof-view of physical understanding the effects of EMP on human tissue is presented. The biological cell of high conductivity i.e. small relaxation time inducing minimum field inside the human body is studied. A detailed picture of electric field and current evolution is demonstrated.

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 83%

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Transient analysis of the human body with a mobile phone subject to intense UWB pulses

Ahmed

Linton

2007

2007 IEEE Antennas and Propagation Society International Symposium

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“…For purposes of illustration, the parameters of the pulser and the TEM structure are chosen to be similar to those of the EMP simulator described in [2]. The TEM structure of [2] has a characteristic impedance of 90 and a matching resistive termination at the aperture. It is driven by an 82-pF peaking capacitor charged to 1 MV.…”

Section: Scope Of This Workmentioning

confidence: 99%

“…The object to be tested is mounted in the bounded volume of the parallel-plate region. The discharging capacitor produces an intense, rapidly varying electromagnetic field, covering a wide frequency range, in the vicinity of the test object [2].…”

Section: Introductionmentioning

confidence: 99%

Modeling of an EMP simulator using a 3-D FDTD code

Ahmed

Sharma

Chaturvedi

2003

IEEE Trans. Plasma Sci.

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We have performed self-consistent, three-dimensional (3-D), time-domain calculations for a bounded-wave electromagnetic pulse simulator. The simulator consists of a constantimpedance transverse electromagnetic structure driven by a charged capacitor, discharging through a fast closing switch. These simulations yield the detailed 3-D electromagnetic field structure in the vicinity of the simulator. The prepulse seen in these simulations can be explained quantitatively in terms of capacitive coupling across the switch and the known charging waveform across the capacitor. Placement of a test object within the simulator significantly modifies the electric fields within the test volume, in terms of field strength as well as the frequency spectrum. This means that, for a given simulator, larger objects would be subjected to somewhat lower frequencies. The E-field waveform experienced by a small test object is reasonably close to that for free-space illumination, but the mismatch increases with object size. The use of a resistive sheet as a matching termination significantly reduces radiation leakage as compared to two parallel resistive rods. For a given termination, larger test objects marginally reduce leakage. A physical interpretation of these conclusions is also included. This work is a first step toward full-fledged optimization of such simulators using 3-D modeling.

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A 800 kV compact peaking capacitor for nanosecond generator

Jia

Chen

Tang

et al. 2014

Review of Scientific Instruments

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An extremely compact high voltage peaking capacitor is developed. The capacitor has a pancake structure with a diameter of 315 mm, a thickness of 59 mm, and a mass of 6.1 kg. The novel structural design endows the capacitor with a better mechanical stability and reliability under hundreds of kilovolts pulse voltage and an inner gas pressure of more than 1.5 MPa. The theoretical value of the capacitor self-inductance is near to 17 nH. Proved by series of electrical experiments, the capacitor can endure a high-voltage pulse with a rise time of about 20 ns, a half-width duration of around 25 ns, and an amplitude of up to 800 kV in a single shot model. When the capacitor was used in an electromagnetic pulse simulator as a peaking capacitor, the rise time of the voltage pulse can be reduced from 20 ns to less than 3 ns. The practical value of the capacitor's inductance deduced from the experimental date is no more than 25 nH.

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High voltage generator with fast risetime for EMP simulation

Cited by 18 publications

References 0 publications

Transient analysis of the human body with a mobile phone subject to intense UWB pulses

Transient analysis of the human body with a mobile phone subject to intense UWB pulses

Modeling of an EMP simulator using a 3-D FDTD code

A 800 kV compact peaking capacitor for nanosecond generator

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