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Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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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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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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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).
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Pump depletion and the Raman gap in ignition-scale plasmas.

S H Cao1,2, M J Rosenberg2, A A Solodov2

  • 1Department of Mechanical Engineering, <a href="https://ror.org/022kthw22">University of Rochester</a>, Rochester, New York 14627, USA.

Physical Review. E
|November 20, 2024
PubMed
Summary
This summary is machine-generated.

Simulations of laser-plasma instabilities in inertial confinement fusion show that stimulated Raman side-scattering depletes laser energy and creates spectral gaps, matching experimental observations.

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Area of Science:

  • Plasma Physics
  • Fusion Energy
  • Computational Physics

Background:

  • Laser-plasma instabilities are critical challenges in achieving inertial confinement fusion (ICF).
  • Understanding these instabilities is essential for efficient direct-drive ICF designs.

Purpose of the Study:

  • To investigate laser-plasma instabilities under direct-drive ICF ignition conditions.
  • To analyze the effects of combined in-plane (PP) and out-of-the-plane (SP) lasers on these instabilities.

Main Methods:

  • Utilizing two-dimensional particle-in-cell (PIC) simulations.
  • Employing a combination of PP and SP laser configurations.

Main Results:

  • Stimulated Raman side-scattering (SRS) was identified as a significant instability.
  • SRS was shown to cause substantial pump depletion, reducing laser energy available for fusion.
  • A characteristic gap was observed in the Raman scattered-light spectra, consistent with experimental findings.

Conclusions:

  • The simulation results validate the role of SRS in pump depletion and spectral gap formation.
  • These findings provide insights into controlling laser-plasma interactions for successful ICF.