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Related Concept Videos

Mass Analyzers: Common Types01:19

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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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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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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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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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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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Design of solid state neutral particle analyzer array for National Spherical Torus Experiment-Upgrade.

D Liu1, W W Heidbrink1, K Tritz2

  • 1Department of Physics and Astronomy, University of California - Irvine, Irvine, California 92697, USA.

The Review of Scientific Instruments
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Summary
This summary is machine-generated.

A new Solid State Neutral Particle Analyzer (SSNPA) diagnostic is being developed for the NSTX-U. This advanced diagnostic provides fast temporal resolution and coarse energy measurements for fast ions.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Technology

Background:

  • Fast ions play a crucial role in heating and sustaining plasma in fusion devices.
  • Accurate measurement of fast ion behavior is essential for understanding and controlling fusion plasmas.
  • Existing diagnostics may have limitations in temporal resolution or energy discrimination for fast ions.

Purpose of the Study:

  • To design and fabricate a new compact, multi-channel Solid State Neutral Particle Analyzer (SSNPA) diagnostic.
  • To achieve fast temporal resolution and coarse energy information for fast ions in the NSTX-U.
  • To differentiate between passing and trapped fast ions and monitor passive signals.

Main Methods:

  • Utilizing silicon photodiode arrays in current mode with varying filter thicknesses.
  • Employing vertically stacked arrays for fast temporal resolution (∼120 kHz bandwidth).
  • Implementing 15 radial and 15 tangential sightlines intersecting neutral beams at specific major radii.
  • Incorporating a dedicated photodiode array for monitoring passive charge-exchange signals.

Main Results:

  • The SSNPA system is designed to provide energy information in three bands: >25 keV, >45 keV, and >65 keV.
  • The diagnostic aims to separate the responses of passing and trapped fast ions.
  • The system is capable of monitoring fast ion behavior with high temporal resolution.

Conclusions:

  • The developed SSNPA diagnostic is a promising tool for fast ion research in the NSTX-U.
  • This diagnostic advancement will enhance the understanding of fast ion physics in toroidal fusion devices.
  • The SSNPA's multi-channel and multi-energy band capabilities offer significant advantages for plasma diagnostics.