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Using X-mode L, R and O-mode reflectometry cutoffs to measure scrape-off-layer density profiles for upgraded ORNL

C Lau¹, J B Wilgen¹, J B Caughman¹

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

The Review of Scientific Instruments

|November 29, 2014

Summary

The upgraded ORNL scrape-off-layer (SOL) reflectometer will use multiple wave cutoffs to measure plasma density on the NSTX-U tokamak. This method avoids higher frequencies, enabling SOL density and magnetic field profile analysis.

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Area of Science:

Plasma physics
Fusion energy research
Tokamak diagnostics

Background:

The Oak Ridge National Laboratory (ORNL) scrape-off-layer (SOL) reflectometer previously measured SOL density profiles on the National Spherical Torus Experiment (NSTX).
NSTX-U spherical tokamak operates at increased magnetic fields, necessitating an upgrade to the existing reflectometer system.

Purpose of the Study:

To adapt the ORNL SOL reflectometer for use on the NSTX-U.
To determine if combined X-mode R, L, and O-mode cutoffs can measure SOL density profiles at NSTX-U's higher magnetic fields.
To explore the potential for measuring SOL magnetic field profiles.

Main Methods:

Utilizing the existing 6-27 GHz frequency range of the reflectometer.
Employing a combination of X-mode R, L, and O-mode cutoffs.
Analyzing reflectometer data to derive SOL density and magnetic field profiles.

Main Results:

Demonstrating that combined cutoffs can successfully measure SOL density profiles on NSTX-U without increasing operating frequencies.
Identifying potential capabilities for SOL magnetic field profile measurements.
Highlighting challenges and limitations of the proposed technique.

Conclusions:

The upgraded reflectometer, using combined cutoffs, offers a viable method for SOL density profile measurement on NSTX-U.
The technique shows promise for SOL magnetic field diagnostics, though further investigation is needed.
The study addresses the challenges of plasma density measurement in high-field tokamak environments.