Related Experiment Video
Updated: May 7, 2026
08:36
An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation
Published on: November 3, 2016
9.9K
All-in-one probe for exploring self-organized two-fluid equilibria in toroidal plasmas
H Himura1, A F Almagri2, J S Sarff2
1Department of Electronics, Kyoto Institute of Technology, Matsugasaki, Sakyo Ward, Kyoto 606-8585, Japan.
The Review of Scientific Instruments
|August 19, 2024
Summary
A novel all-in-one probe simultaneously measures generalized Ohm's law components in fusion plasmas. This tool aids in validating plasma physics theories by providing crucial 3D ion velocity data.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Diagnostic Instrumentation
Background:
- Understanding plasma behavior is crucial for fusion energy development.
- Accurate measurement of plasma parameters is essential for validating theoretical models.
- Existing probes often measure only limited components of plasma behavior.
Purpose of the Study:
- To develop an integrated probe for simultaneous measurement of all generalized Ohm's law components.
- To enable comprehensive characterization of plasma periphery in toroidal devices.
- To facilitate empirical validation of two-fluid plasma equilibria.
Main Methods:
- Development of a polyhedral Mach probe using a boron nitride cylinder.
- Precision drilling of collimator channel apertures for specific arrangement, angle, and depth.
- Integration of a central Mach probe for three-dimensional ion velocity field assessment.
Main Results:
- Successful development of an all-in-one probe for simultaneous multi-component plasma measurements.
- Initial tests on RELAX and Madison Symmetric Torus machines confirm probe functionality.
- Observed an octahedron-like form, validating the probe's design.
Conclusions:
- The developed probe effectively measures key plasma parameters simultaneously.
- The probe is expected to significantly advance the empirical validation of plasma physics theories.
- This innovation offers a powerful new diagnostic tool for fusion research.
Related Concept Videos
01:13Torque On A Current Loop In A Magnetic Field
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
01:19Inductively 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...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
01:26Inductively 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).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
01:17Steady, Laminar Flow Between Parallel Plates
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
01:22Couette Flow
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
01:23Steady, Laminar Flow in Circular Tubes
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...