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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation
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Published on: November 3, 2016

A 1 MA, variable risetime pulse generator for high energy density plasma research.

J B Greenly1, J D Douglas, D A Hammer

  • 1Laboratory of Plasma Studies, 439 Rhodes Hall, Cornell University, Ithaca, New York 14853, USA.

The Review of Scientific Instruments
|August 7, 2008
PubMed
Summary
This summary is machine-generated.

The COBRA pulse generator uses laser-triggered switches in water lines to create high currents (>1 MA) for inductive loads. This design enables adjustable current pulse shapes and rise times for advanced pulsed power applications.

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Last Updated: Jul 3, 2026

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

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Published on: July 2, 2012

Area of Science:

  • Pulsed Power Science and Engineering
  • High Energy Density Physics
  • Laser-Triggered Switching

Background:

  • Pulsed power systems are crucial for applications like fusion energy and materials science.
  • Achieving high currents (>1 MA) with controlled pulse shapes is a key challenge.
  • Existing systems often face limitations in switching reliability and parameter control.

Purpose of the Study:

  • To present the design and operational capabilities of the COBRA pulse generator.
  • To detail the laser-triggered switching mechanism for pulse shaping.
  • To introduce a novel solution for reliable operation in water-based systems.

Main Methods:

  • Utilized four parallel water pulse-forming lines with independent laser triggering.
  • Drove inductive loads (approx. 10 nH) to currents exceeding 1 MA.
  • Developed a simple inductive load voltage monitor for impedance and energy analysis.
  • Implemented a novel method to eliminate gas bubbles on insulator surfaces.

Main Results:

  • Achieved a wide variety of current pulse shapes and rise times (95–230 ns).
  • Demonstrated reliable operation of the laser-triggered switches.
  • Successfully monitored load impedance and energy dissipation.
  • The gas bubble elimination method proved effective for stable operation.

Conclusions:

  • The COBRA pulse generator offers a flexible and reliable platform for high-current pulsed power research.
  • Laser-triggered switching provides precise control over current pulse parameters.
  • The developed techniques enhance the operational stability and diagnostic capabilities of water-dielectric pulsed power systems.