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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Atomic Emission Spectroscopy: Overview01:20

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...
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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...

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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Published on: June 9, 2016

Alpha channeling in a rotating plasma.

Abraham J Fetterman1, Nathaniel J Fisch

  • 1Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA.

Physical Review Letters
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

Radio frequency waves can channel alpha particles in rotating plasma, enhancing fusion reactor confinement and reactivity. This wave-particle effect boosts rotation energy and aids in rapid alpha particle removal.

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Last Updated: Jun 26, 2026

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Published on: June 9, 2016

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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Published on: October 5, 2018

Area of Science:

  • Plasma physics
  • Fusion energy research
  • Wave-particle interactions

Background:

  • The wave-particle alpha-channeling effect is crucial for understanding particle behavior in plasma.
  • Rotating plasma introduces complexities in particle dynamics, particularly for fusion applications.
  • Alpha particles play a significant role in fusion reactor energy balance and stability.

Purpose of the Study:

  • To generalize the wave-particle alpha-channeling effect for rotating plasma.
  • To investigate the resonance between radio frequency (RF) waves and alpha particles in a rotating mirror machine.
  • To explore the potential of this effect for enhancing plasma confinement and fusion reactivity.

Main Methods:

  • Theoretical generalization of the wave-particle alpha-channeling effect.
  • Analysis of RF wave resonance with alpha particles in a plasma with ExB rotation.
  • Phase space diffusion modeling of alpha particles.

Main Results:

  • The study demonstrates that RF waves can resonate with alpha particles in rotating plasma.
  • Alpha particles diffuse along constrained paths in phase space due to this resonance.
  • Alpha particle energy directly enhances plasma rotation energy, improving confinement.
  • Rapid removal of alpha particles is achieved, increasing fusion reactivity.

Conclusions:

  • The generalized wave-particle alpha-channeling effect offers a novel mechanism for plasma control in fusion reactors.
  • Enhanced plasma rotation and efficient alpha particle removal contribute to improved fusion performance.
  • This research has significant implications for the design and operation of centrifugal fusion reactors.