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Rise time

About: Rise time is a research topic. Over the lifetime, 4748 publications have been published within this topic receiving 47512 citations.


Papers
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Journal ArticleDOI
R. Bartnikas1, J.P. Novak1
TL;DR: In this article, a two-dimensional mathematical model has been employed to characterize the breakdown behavior of a short gap in air, and it has been established that the form or shape of a breakdown current pulse is very much determined by the overvoltage developed across the gap.
Abstract: A two-dimensional mathematical model has been employed to characterize the pulse or spark breakdown behavior of a short gap in air. It has been established that the form or shape of a breakdown current pulse is very much determined by the overvoltage developed across the gap. Large overvoltages lead to intense space charge effects, which appreciably modify the breakdown current pulse form, leading to more rapid rise times, greater peak current amplitudes and reduced pulse widths. In so far as the overvoltage across a given cavity affects the rise time and amplitude of the pulse resulting from a spark type discharge, the response of a conventional partial discharge pulse detector is necessarily a function of the overvoltage developed across the cavity. >

41 citations

Patent
23 Sep 2005
TL;DR: In this article, a high current density plasma generator includes a chamber that contains a feed gas and an anode is positioned in the chamber, and a cathode assembly is position adjacent to the anode inside the chamber.
Abstract: A high current density plasma generator includes a chamber that contains a feed gas. An anode is positioned in the chamber. A cathode assembly is position adjacent to the anode inside the chamber. A power supply having an output is electrically connected between the anode and the cathode assembly. The power supply generates at the output an oscillating voltage that produces a plasma from the feed gas. At least one of an amplitude, frequency, rise time, and fall time of the oscillatory voltage is chosen to increase an ionization rate of the feed gas.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed a finite element micromagnetic model to investigate the dynamics of write heads for perpendicular recording at high density and high data-rates, which includes the entire head geometry, with the large return pole and the soft underlayer.
Abstract: We have developed a finite-element micromagnetics model to investigate the dynamics of write heads for perpendicular recording at high density and high data-rates. The model includes the entire head geometry, with the large return pole and the soft underlayer. The response of the head to the coil current is determined by the current waveform shape and duration, Gilbert damping constant, and presence of soft underlayer and shields. Large damping leads to a large phase shift between the coil current and the head field while small damping causes strong gyromagnetic precession. We find that an intermediate value of the damping constant gives the fastest head field rise time. The intrinsic reversal time decreases from 540 to 250 ps by reducing coil-turns from two to one and shortening the yoke length. Thus, an intermediate value of the damping constant, short yoke length, and fast current rise time are needed for maximum data rate.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the probability of reaching a critical electron density within a given time period is composed of the statistical waiting time for the appearance of initiating electrons in the high-field region and the build-up of an avalanche with an inherent statistical distribution of the electron number.
Abstract: Characterizing and modeling the statistics associated with the initiation of gas breakdown has proven to be difficult due to a variety of rather unexplored phenomena involved. Experimental conditions for high power microwave window breakdown for pressures on the order of 100 to several 100 torr are complex: there are little to no naturally occurring free electrons in the breakdown region. The initial electron generation rate, from an external source, for example, is time dependent and so is the charge carrier amplification in the increasing radio frequency (RF) field amplitude with a rise time of 50 ns, which can be on the same order as the breakdown delay time. The probability of reaching a critical electron density within a given time period is composed of the statistical waiting time for the appearance of initiating electrons in the high-field region and the build-up of an avalanche with an inherent statistical distribution of the electron number. High power microwave breakdown and its delay time is of...

41 citations

Proceedings ArticleDOI
17 Jun 2001
TL;DR: In this paper, the authors present the design and test results of a fast LTD stage with 100 ns current rise time, which is the first stage with a 100 ns rise time.
Abstract: Summary form only given. LTD stages are designed to be used as primary storage of pulsed power generators. Their main difference compared to the Marx scheme is ground potential on the stage housing during the shot. This reduces the dimensions of the storage, makes it flexible for reconstruction, simplifies the assembling and maintenance. Other advantage of the grounded housing is the possibility to trigger each stage from the external trigger circuit. This allows to distribute the current flow inside the stage in multiple parallel channels, reducing the equivalent inductance and the current rise time. Previously LTD stages providing 1000 ns and 400 ns current rise time were reported (Bastrikov et al., 1997, Kim et al., 1999). This report presents the design and test results of a fast LTD stage with 100 ns current rise time.

41 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
202264
2021111
2020146
2019157
2018147