Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Thomson's e/m Experiment

Thomson's e/m Experiment

In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...

Atomic Emission Spectroscopy: Instrumentation

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

Compass

Compass

The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...

Atomic Emission Spectroscopy: Lab

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

Atomic Emission Spectroscopy: Overview

Atomic Emission Spectroscopy: Overview

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...

Atomic Emission Spectroscopy: Interference

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Microwave reflectometer for density profile and turbulence measurements on the COMPASS tokamak.

The Review of scientific instruments·2020

Same author

Search for direct top squark pair production in final states with two leptons in <math> </math> TeV <i>pp</i> collisions with the ATLAS detector.

The European physical journal. C, Particles and fields·2020

Same author

Determination of the strong coupling constant <math></math> from transverse energy-energy correlations in multijet events at <math> </math> using the ATLAS detector.

The European physical journal. C, Particles and fields·2020

Same author

Radiometry for the vertical electron cyclotron emission from the runaway electrons at the COMPASS tokamak.

The Review of scientific instruments·2019

Same author

Comparison of hair manifestations in cardio-facio-cutaneous and Costello syndromes highlights the influence of the RAS pathway on hair growth.

Journal of the European Academy of Dermatology and Venereology : JEADV·2019

Same author

Observation of Electroweak Production of a Same-Sign W Boson Pair in Association with Two Jets in pp Collisions at sqrt[s]=13 TeV with the ATLAS Detector.

Physical review letters·2019

Search research articles

Related Experiment Video

Updated: May 17, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

First results from EBW emission diagnostics on COMPASS.

J Zajac¹, J Preinhaelter, J Urban

¹Institute of Plasma Physics AS CR, vvi, Association EURATOM∕IPP.CR, Prague, Czech Republic. zajac@ipp.cas.cz

The Review of Scientific Instruments

|November 7, 2012

Summary

Electron Bernstein waves (EBWs) in COMPASS tokamak plasmas are observed via O and X mode cutoff. Angular scans reveal reflections influence emission, and low temperatures cause damping, explaining lower radiative temperatures than electron temperatures.

More Related Videos

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Published on: August 25, 2016

Related Experiment Videos

Last Updated: May 17, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Published on: August 25, 2016

Area of Science:

Plasma physics
Fusion energy research
Tokamak diagnostics

Background:

COMPASS tokamak operates at low magnetic fields, producing overdense plasmas.
Electron cyclotron emission (ECE) is crucial for plasma diagnostics.
First harmonic ECE is cutoff for O and X modes in overdense plasmas.

Purpose of the Study:

Investigate electron Bernstein waves (EBWs) emission in overdense plasmas.
Determine the optimal antenna direction for EBW emission measurements.
Understand the factors affecting radiative temperature measurements.

Main Methods:

Performed angular scans of EBW emission during comparable tokamak shots.
Analyzed the influence of antenna direction on observed emission.
Compared radiative temperature with electron temperature measured by Thomson scattering.

Main Results:

Observed EBW emission due to EBW-X-O conversion process.
Weak dependence of radiative temperature on antenna angles suggests vessel wall reflections.
Measured radiative temperature was several times lower than electron temperature.

Conclusions:

Collisional damping of EBW at the mode conversion region explains the reduced radiative temperature.
Multiple reflections from the vessel wall impact emission measurements.
Understanding these effects is crucial for accurate plasma diagnostics in tokamaks.