XP 514: Thermal Electron Bernstein Wave Conversion to O-Mode at 20-40 GHz G. Taylor, P. Efthimion, J. Wilgen, J. Caughman Goals for this experiment: –Measure.

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Presentation transcript:

XP 514: Thermal Electron Bernstein Wave Conversion to O-Mode at GHz G. Taylor, P. Efthimion, J. Wilgen, J. Caughman Goals for this experiment: –Measure T e (R,t) via thermal EBW emission –Analyze polarization of thermal EBW emission –Demonstrate >80% coupling of thermal EBWs at ~ 28 GHz

Dual Channel GHz Radiometer & Steerable Quad- Ridged Horn Provide Orthogonal Polarization Measurements New instrument will allow measurement of GHz thermal EBW emission with ~ 10  s time resolution to support T e (R,t) diagnostic development

XP405 Demonstrated ~ 80% B-X-O Coupling at 16.5 GHz via Thermal EBW Coupling Full wave coupling model/3-D EBW ray tracing predicts ~ 62-67% coupling in good agreement with measurements Modeling predicts circularly polarized emission, consistent with measurements Pickup from UCLA reflectometer

AORSA1D Full Wave Coupling Calculations Predict Efficient Coupling at ~ 28 GHz 28 GHz being considered as operating frequency for megawatt-level NSTX EBWCD system Experiment will aim to benchmark modeling predictions, including emission polarization at ~28 GHz

Run Plan Initial measurements in “piggyback” mode to identify optimum antenna alignment for a dedicated experiment Dedicated experiment will probably use plasma parameters similar to NSTX shot , (I p = 800 kA, B o = 4 kG & ~ 2 MW NBI) - would benefit from a relatively long, ~200 ms, I p flattop Dedicated experiment requires at least 12 shots Essential diagnostics: - Thomson scattering T e (R) and n e (R) - Scrape off density profile from ORNL and/or UCLA reflectometer for input to full wave coupling code - EFIT to reconstruct equilibria for 3-D EBW ray tracing

Run Plan - Dedicated Shots 1. Setup & repeat shot similar to (outer gap ~ 5 cm) until the plasma condition becomes reasonably reproducible. Run EBW radiometer in swept GHz mode (2-3 shots) 2. Set radiometer receive frequency ~ 28 GHz (1 shot) 3. Increase outer gap in 5 cm steps to ~ 20 cm, take radiometer data at ~ 28 GHz and GHz swept mode for each outer gap (6 shots) 4.In controlled access, rotate antenna by 45 degrees, then run plasma from step 3 that provided maximum EBW signal with radiometer receive frequency ~ 28 GHz and GHz swept mode (2 shots) 5. In controlled access, insert quarter wave plate in front of antenna, then run plasma with radiometer receive frequency ~ 28 GHz and in GHz swept mode (2 shots)