Related Experiment Video
Updated: May 6, 2026
11:44
Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
Published on: November 12, 2016
19.6K
Toroidal charge exchange recombination spectroscopy measurements on MST
R M Magee1, D J Den Hartog, G Fiksel
1University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA. rmmagee@wisc.edu
The Review of Scientific Instruments
|November 2, 2010
Summary
Researchers measured the parallel impurity ion temperature in a reversed field pinch plasma. This advancement in diagnostics provides new insights into plasma ion dynamics.
Area of Science:
- Plasma Physics
- Atomic Physics
- Spectroscopy
Background:
- Charge exchange recombination spectroscopy (CXRS) is crucial for understanding ion dynamics in reversed field pinch (RFP) plasmas.
- Previous CXRS measurements in RFPs focused on the poloidal component of impurity ion temperature and flow.
Purpose of the Study:
- To expand diagnostic capabilities in RFP research by enabling toroidal measurements.
- To achieve the first localized measurements of the parallel component of impurity ion temperature in the core of an RFP.
Main Methods:
- Utilized a new toroidal view for CXRS measurements, overcoming low signal-to-background ratios (5%-15%).
- Employed maximal light collection and extensive atomic modeling for accurate line fitting.
- Implemented an absolute calibration to quantify Poisson noise effects.
- Stimulated emission using a 50 keV hydrogen diagnostic neutral beam.
- Achieved radial localization of ~4 cm^2 and temporal resolution of 100 μs via simultaneous emission and background measurements with a high-throughput spectrometer.
Main Results:
- Successfully performed the first localized measurements of the parallel component of C(+6) ion temperature in the RFP core.
- Demonstrated the feasibility of toroidal CXRS measurements despite challenging signal-to-background ratios.
Conclusions:
- The new toroidal CXRS capability significantly enhances the understanding of ion dynamics in RFP plasmas.
- This diagnostic advancement opens new avenues for studying parallel transport and kinetic effects in fusion devices.
More Related Videos
11:33All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
8.3K
10:28Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy NMR and Microscale Thermophoresis MST
Published on: November 2, 2018
13.5K
Related Concept Videos
01:13¹H NMR: Complex Splitting
1.7K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.7K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
1.3K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.3K
01:23Magnetic Field due to Moving Charges
11.3K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
11.3K
01:21Tandem Mass Spectrometry
3.0K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
3.0K
01:12Double Resonance Techniques: Overview
874
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
874