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Multi-dimensional incoherent Thomson scattering system in PHAse Space MApping (PHASMA) facility.

Peiyun Shi1, Earl E Scime1

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A new diagnostic system measures electron temperature anisotropies using Thomson scattering. This allows detailed investigation of electron energization during magnetic reconnection events.

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Area of Science:

  • Plasma physics
  • Astrophysics
  • Magnetic reconnection

Background:

  • Electron temperature anisotropies are crucial for understanding plasma behavior.
  • Magnetic reconnection is a key process in space and laboratory plasmas.
  • Investigating electron energization mechanisms requires precise measurements of the electron velocity distribution function (EVDF).

Purpose of the Study:

  • To implement and validate a multi-dimensional incoherent Thomson scattering diagnostic system.
  • To measure electron temperature anisotropies at the EVDF level.
  • To investigate electron energization mechanisms during magnetic reconnection.

Main Methods:

  • Utilizing a multi-dimensional incoherent Thomson scattering system on the PHAse Space MApping (PHASMA) facility.
  • Employing two injection paths (perpendicular and parallel) and two collection paths for four independent EVDF measurements.
  • Reconstructing a 3D EVDF with two characteristic electron temperatures (perpendicular and parallel) from measured data.

Main Results:

  • Successfully implemented a Thomson scattering diagnostic system for EVDF measurements.
  • Demonstrated the capability to measure electron temperature anisotropies.
  • Validated the system's performance in a single magnetic flux rope and a steady-state helicon plasma with isotropic electrons.

Conclusions:

  • The developed Thomson scattering system is effective for measuring electron temperature anisotropies.
  • This diagnostic tool advances the study of electron energization during magnetic reconnection.
  • The system provides a foundation for future investigations into complex plasma phenomena.