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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 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...
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Published on: December 22, 2015

A compact multichannel spectrometer for Thomson scattering.

N L Schoenbeck1, D J Schlossberg, A S Dowd

  • 1Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706, USA. nschoenbeck@wisc.edu

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

A simplified spectrometer using volume phase holographic gratings and intensified CCD cameras enables accurate Thomson scattering detection. This compact system efficiently measures electron temperature (T(e)) across various energy ranges.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Optical Diagnostics

Background:

  • Traditional Thomson scattering diagnostics can be complex and bulky.
  • Advances in volume phase holographic (VPH) gratings and intensified CCD (ICCD) cameras offer new possibilities for spectrometer design.
  • High-efficiency VPH gratings and fast-gated ICCD cameras are key components for improved detection.

Purpose of the Study:

  • To develop a simplified and compact spectrometer for Thomson scattering detection.
  • To enable efficient measurement of electron temperature (T(e)) using advanced optical components.
  • To enhance spatial and spectral resolution for plasma diagnostics.

Main Methods:

  • Utilized high-efficiency VPH gratings (2971 l/mm and 2072 l/mm) for different electron temperature ranges.
  • Employed a fast-gated (~2 ns) ICCD camera with a Gen III image intensifier for detection.
  • Implemented on-chip binning of the CCD to reduce read noise and match spatial/spectral channels.
  • Configured three spectrometers for a minimum of 12 spatial channels and 12 background subtraction channels.

Main Results:

  • Successfully achieved Thomson scattering detection with a simplified and compact spectrometer.
  • Demonstrated measurements of electron temperature (T(e)) for both < 100 eV and > 100 eV ranges.
  • The ICCD camera provided high quantum efficiency (~45%) in the visible region.
  • On-chip binning effectively reduced read noise, optimizing data acquisition.

Conclusions:

  • The developed spectrometer offers a simplified, compact, and efficient solution for Thomson scattering measurements.
  • The combination of VPH gratings and ICCD cameras provides robust electron temperature diagnostics.
  • The system's design supports multi-channel spatial and spectral analysis with background subtraction.