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Updated: Jul 2, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

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Published on: September 8, 2016

Cornell Thomson scattering system.

J D Sethian¹, C A Ekdahl

¹Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14850.

The Review of Scientific Instruments

|June 1, 1978

Summary

This summary is machine-generated.

A new Thomson scattering system effectively measures relativistic electron beam heated plasma. This system can resolve electron temperatures and densities, with observed relativistic blue shifts at higher temperatures.

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Area of Science:

Plasma Physics
Laser-Plasma Interactions
Relativistic Electron Beams

Background:

Understanding plasma properties is crucial for fusion energy and astrophysics.
Relativistic electron beams create unique plasma conditions requiring advanced diagnostics.
Thomson scattering is a powerful, non-intrusive method for plasma characterization.

Purpose of the Study:

To design and construct a Thomson scattering system for probing relativistic electron beam heated plasmas.
To establish the system's capability in resolving electron temperature and density.
To investigate plasma behavior at elevated temperatures, including relativistic effects.

Main Methods:

Utilizing a 90-degree Thomson scattering setup with a ruby laser.
Employing a polychromator and photomultipliers for scattered light detection.
Implementing specific system design, calibration, alignment, and data reduction techniques.

Main Results:

The system successfully resolves electron temperatures of 150 eV at densities below 10^13 cm^-3 with a 4-J laser.
Potential for resolving densities around 10^12 cm^-3 with system upgrades (10-J laser, f/5 optics).
Observed evidence of relativistic blue shift at electron temperatures around 600 eV.

Conclusions:

The developed Thomson scattering system is a viable diagnostic for relativistic electron beam heated plasmas.
The system's sensitivity and resolution are suitable for current experimental regimes.
Further system enhancements can extend its capabilities to lower densities and higher energies, providing valuable data for plasma physics research.