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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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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...
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
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A new compact solid-state neutral particle analyser at ASDEX Upgrade: Setup and physics modeling.

P A Schneider1, H Blank1, B Geiger1

  • 1Max-Planck-Institut für Plasmaphysik, Garching, Germany.

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A new solid-state detector at ASDEX Upgrade measures fast neutral particle energy spectra. Modeling this data helps reconstruct fast-ion velocity distributions, crucial for fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Technology

Background:

  • Fast ions play a critical role in heating plasmas in fusion devices.
  • Measuring the energy spectra of these fast ions is essential for understanding plasma confinement and stability.
  • Existing diagnostics have limitations in spatial and temporal resolution for fast-ion measurements.

Purpose of the Study:

  • To introduce and validate a new compact solid-state detector for measuring fast neutral particle energy spectra at ASDEX Upgrade.
  • To utilize charge exchange principles for inferring confined fast-ion energy spectra.
  • To develop and apply advanced modeling techniques for signal analysis and fast-ion profile reconstruction.

Main Methods:

  • Installation and calibration of a new compact solid-state detector at ASDEX Upgrade (AUG).
  • Utilizing the charge exchange of fast ions with plasma neutrals to measure energy spectra.
  • Employing a 3D Monte Carlo code (F90FIDASIM) with a new module for data modeling and analysis.
  • Distinguishing between active (heating beam) and passive signal contributions.

Main Results:

  • The new detector demonstrates good signal-to-noise characteristics and energy calibration (40-200 keV).
  • It achieves high count rates (up to 140 kcps) and has an active view on a heating beam.
  • The developed modeling accurately reproduces measured energy spectra, accounting for passive contributions.
  • Reconstruction of the birth profile of fast neutrals is achieved.

Conclusions:

  • The new solid-state detector is a valuable diagnostic for fast neutral particle energy spectrum measurements at AUG.
  • Advanced modeling techniques enable accurate reconstruction of fast-ion velocity distributions and birth profiles.
  • This diagnostic and modeling approach enhances the understanding of fast-ion behavior in fusion plasmas.