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Scrape-off layer reflectometer for Alcator C-Mod.

G R Hanson1, J B Wilgen, C Lau

  • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

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A new reflectometer system on Alcator C-Mod measures plasma density and fluctuations in the scrape-off layer (SOL). This advanced diagnostic tool enhances understanding of fusion plasma edge conditions near new antennas.

Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Understanding plasma behavior in the scrape-off layer (SOL) is crucial for magnetic confinement fusion devices.
  • Accurate measurement of plasma density and fluctuations is essential for optimizing reactor performance and stability.
  • New antenna systems require advanced diagnostics to characterize their impact on the plasma edge.

Purpose of the Study:

  • To deploy and utilize a novel two-frequency X-mode reflectometer on the Alcator C-Mod tokamak.
  • To measure plasma density profiles and fluctuations in the SOL region adjacent to new ICRF and lower hybrid launchers.
  • To provide high-flexibility measurements capable of handling significant density variations in the SOL.

Main Methods:

  • A two-frequency X-mode reflectometer operating between 100-146 GHz was implemented.

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  • The system covers plasma densities from 10^16 to 10^20 m^-3 at magnetic fields of 5-5.4 T.
  • Both full-phase and differential-phase measurement modes were employed, with sweep speeds from 10 microseconds to over 1 millisecond, utilizing a 500 MHz difference frequency for differential-phase measurements.

    • Main Results:

    • The reflectometer successfully measured density profiles and fluctuations in the SOL near the J-port ICRF antenna and C-port lower hybrid launcher.
    • The system demonstrated capability to handle high density fluctuations (up to 100% peak-to-peak) in the SOL.
    • Differential-phase measurements provided high spatial resolution, resolving cutoff layer separations of 0.1-1 mm.

    Conclusions:

    • The deployed X-mode reflectometer is a capable diagnostic for characterizing SOL plasma conditions.
    • The system provides valuable data on plasma-antenna interactions, crucial for future fusion device designs.
    • The advanced measurement capabilities enhance the understanding of turbulent transport at the plasma edge.