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Incoherent Thomson scattering system for PHAse space MApping (PHASMA) experiment.

Peiyun Shi1, Prabhakar Srivastav1, Cuyler Beatty1

  • 1Department of Physics and Astronomy, West Virginia University and Center for KINETIC Plasma Physics, Morgantown, West Virginia 26506, USA.

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Summary
This summary is machine-generated.

A new Thomson scattering system precisely measures electron behavior during magnetic reconnection events. This advancement aids in understanding plasma dynamics in fusion experiments.

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Area of Science:

  • Plasma Physics
  • Magnetic Reconnection
  • Fusion Energy Research

Background:

  • Magnetic reconnection is crucial for energy release in plasmas.
  • Understanding electron dynamics is key to controlling fusion processes.
  • Previous diagnostic limitations hindered detailed analysis of reconnection regions.

Purpose of the Study:

  • To develop and implement a novel incoherent Thomson scattering system.
  • To measure electron velocity distribution functions during flux rope kinking and merging.
  • To diagnose the electron diffusion region in magnetic reconnection events within the PHAse Space MAppgin experiment.

Main Methods:

  • Utilized a new incoherent Thomson scattering system with sub-millimeter spatial resolution.
  • Employed a notch filter with two volume Bragg gratings for stray light suppression (<0.1 nm spectral bandwidth).
  • Used a CCD with a Gen III intensifier and a 1.3 m spectrometer for detection.

Main Results:

  • Successfully measured electron velocity distribution functions perpendicular and parallel to the magnetic field.
  • Diagnosed the electron diffusion region in magnetic reconnection events.
  • Obtained preliminary electron temperature measurements for comparison.

Conclusions:

  • The new Thomson scattering system is effective for diagnosing magnetic reconnection.
  • The system's resolution and sensitivity are suitable for modest plasma parameters.
  • Results will be compared with triple Langmuir probe measurements for validation.