Related Experiment Video
Updated: Apr 19, 2026
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
10.4K
Current waveform reconstruction from an explosively emissive cathode at a subnanosecond voltage front
K A Sharypov1, M R Ul'masculov1, V G Shpak1
1Institute of Electrophysics UB RAS, 106 Amundsen Str., 620016 Ekaterinburg, Russia.
The Review of Scientific Instruments
|January 3, 2015
Summary
Researchers developed a method to precisely measure electron beam current using picosecond timing. This technique accurately tracks cathode emission changes pulse-to-pulse for advanced experimental analysis.
Area of Science:
- Physics
- Electrical Engineering
Background:
- Accurate timing of electron beams is crucial for high-speed experiments.
- Characterizing explosive electron emission from cathodes requires precise measurement techniques.
Purpose of the Study:
- To present a method for registering and reconstructing the envelope of explosive electron emission current.
- To establish a picosecond time reference for emitted electron beams.
- To enable precise tracking of cathode emission dynamics.
Main Methods:
- Utilizing a cylindrical cathode with explosive electron emission.
- Applying a subnanosecond voltage front to the accelerating gap.
- Employing dynamic time domain reflectometry for precise current measurement.
Main Results:
- Achieved a picosecond time reference for the electron beam.
- Demonstrated the ability to determine beam onset time by varying voltage front steepness.
- Obtained exact data on electron beam current rise with precision under 10 picoseconds.
- Tracked changes in cathode emission from pulse to pulse.
Conclusions:
- The described method provides a highly precise tool for analyzing electron beam characteristics.
- Dynamic time domain reflectometry offers sub-picosecond accuracy in measuring fast current dynamics.
- This technique is valuable for experiments requiring precise timing of electron emission.
Related Concept Videos
01:10Generating Electromagnetic Radiations
8.8K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
8.8K
01:20Atomic Emission Spectroscopy: Overview
4.5K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
4.5K
01:15Van de Graaff Generator
3.0K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
3.0K