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Tandem Mass Spectrometry01:21

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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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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Calibration techniques for Thomson scattering diagnostics on large fusion experiments.

G Fuchert1, J Wagner1, L V Henschke1,2

  • 1Max-Planck-Institut für Plasmaphysik (IPP), 17491 Greifswald, Germany.

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|August 16, 2024
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Summary
This summary is machine-generated.

New calibration methods for fusion diagnostics improve accuracy and reduce time. These techniques address challenges like beam displacement and window coating, crucial for future nuclear fusion experiments.

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Area of Science:

  • Fusion energy research
  • Plasma physics diagnostics
  • Optical calibration techniques

Background:

  • Large fusion experiments require stable laser diagnostics with long beam paths.
  • Technical and organizational constraints complicate calibration procedures.
  • Mid-sized experiments like Wendelstein 7-X (W7-X) serve as testbeds for new calibration methods.

Purpose of the Study:

  • To develop and validate novel calibration techniques for Thomson scattering diagnostics.
  • To address challenges including beam displacement, window contamination, and access restrictions at W7-X.
  • To improve profile quality and reduce calibration time for fusion plasma measurements.

Main Methods:

  • Developed an in situ spectral calibration using Rayleigh scattering for comprehensive diagnostic calibration.
  • Implemented a rapid spectral calibration using tunable optical parametric oscillator (OPO) stray-light, avoiding torus hall access.
  • Established a workflow to account for finite linewidths of calibration sources.

Main Results:

  • Positional variations of the laser beam are minimized and remaining displacements are corrected during absolute calibration.
  • The Rayleigh scattering method calibrates the entire diagnostic, including observation windows.
  • The OPO stray-light method provides a faster, albeit less accurate, spectral calibration within minutes.

Conclusions:

  • The developed calibration methods enhance the accuracy and efficiency of Thomson scattering diagnostics at W7-X.
  • These techniques are applicable to current and future fusion experiments, especially those with stringent access restrictions.
  • The methods offer solutions for critical calibration issues in demanding nuclear fusion environments.