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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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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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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Fast-ion Dα spectrum diagnostic in the EAST.

Y M Hou1, C R Wu1, J Huang1

  • 1Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, China.

The Review of Scientific Instruments
|December 3, 2016
PubMed
Summary
This summary is machine-generated.

Fast-ion D-alpha diagnostic (FIDA) systems were enhanced on the Experimental Advanced Superconducting Tokamak (EAST). These systems now capture fast-ion characteristics simultaneously, improving fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Spectroscopy

Background:

  • Fast-ion D-alpha diagnostic (FIDA) is crucial for studying fast-ion behavior in toroidal magnetic fusion devices.
  • Fast-ion characteristics are inferred from Doppler-shifted Dα light spectra via charge exchange recombination.
  • Previous conceptual designs have been advanced for FIDA application on the Experimental Advanced Superconducting Tokamak (EAST).

Purpose of the Study:

  • To detail the significant progress in applying FIDA systems on the EAST.
  • To present the hardware descriptions and experimental spectra of the newly installed FIDA systems.
  • To enable simultaneous capture of passing and trapped fast-ion characteristics.

Main Methods:

  • Installation of two high-throughput spectrometer systems on EAST.
  • Utilizing Kaiser HoloSpec transmission grating spectrometers and Bunkoukeiki FLP-200 volume phase holographic spectrometers.
  • Coupling spectrometers with Princeton Instruments ProEM 1024B eXcelon and Andor DU-888 iXon3 1024 CCD cameras.

Main Results:

  • Successful implementation of FIDA systems on EAST, leveraging both co-current and counter-current neutral beam injectors (2-4 MW, 50-80 keV).
  • Acquisition of experimental spectra enabling the study of fast-ion behavior.
  • Demonstration of simultaneous capture of passing and trapped fast-ion characteristics.

Conclusions:

  • The enhanced FIDA systems on EAST provide advanced capabilities for fast-ion research.
  • The detailed hardware and spectral data contribute to a deeper understanding of fusion plasma dynamics.
  • This advancement supports the development of future magnetic fusion energy devices.