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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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...
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...

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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Published on: January 20, 2022

Calibration techniques for fast-ion Dα diagnostics.

W W Heidbrink1, A Bortolon, C M Muscatello

  • 1University of California, Irvine, California 92697, USA. bill.heidbrink@uci.edu

The Review of Scientific Instruments
|November 7, 2012
PubMed
Summary
This summary is machine-generated.

Fast-ion D(α) measurements using visible charge-exchange recombination (CER) spectroscopy are calibrated using integrating spheres or synthetic diagnostics. Discrepancies between methods highlight the need for robust calibration checks in fusion plasma research.

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Area of Science:

  • Plasma physics
  • Spectroscopy
  • Fusion energy research

Background:

  • Fast-ion D(α) measurements are crucial for understanding energetic ion populations in fusion plasmas.
  • Visible charge-exchange recombination (CER) spectroscopy is a key diagnostic technique.
  • Standard intensity calibration relies on integrating spheres during vacuum vessel openings.

Purpose of the Study:

  • To evaluate alternative calibration methods for fast-ion D(α) measurements.
  • To compare the standard integrating sphere method with a synthetic diagnostic approach.
  • To identify and address discrepancies in calibration results.

Main Methods:

  • Utilizing visible charge-exchange recombination (CER) spectroscopy for fast-ion D(α) measurements.
  • Employing integrating spheres for standard intensity calibration.
  • Developing and using synthetic diagnostic codes with known fast-ion populations.
  • Implementing different background subtraction techniques.
  • Performing simultaneous measurements of visible bremsstrahlung and beam emission.

Main Results:

  • The standard integrating sphere calibration and the synthetic diagnostic code method show agreement in some cases but discrepancies in others.
  • Background subtraction techniques and auxiliary measurements provide valuable cross-checks for calibration accuracy.
  • The study identifies specific scenarios where calibration methods diverge, necessitating further investigation.

Conclusions:

  • Both calibration methods have limitations, and discrepancies require careful analysis.
  • Auxiliary measurements and refined background subtraction are essential for reliable fast-ion D(α) diagnostics.
  • Accurate calibration of fast-ion diagnostics is critical for advancing fusion energy research.