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A LASER SCATTERING DIAGNOSTIC

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Presentation on theme: "A LASER SCATTERING DIAGNOSTIC"— Presentation transcript:

1 A LASER SCATTERING DIAGNOSTIC
TO STUDY THE ANOMALOUS FLUX DISSIPATION OF AN FRC Onnie Luk Advisor: Tobin Munsat

2 Some Preliminaries… FRC: Field-Reversed Configuration
Magnetic configuration for plasma confinement Fusion energy research My summer project Design a laser diagnostic instrument for fluctuation measurement in FRC experiment at Los Alamos National Laboratory

3 What is Plasma? 4th state of matter
Ionized gas with its motion controlled by electromagnetic fields 99% of all baryonic matter in the universe is made up of plasma Stars Interstellar gas Interplanetary space (solar wind)

4 What is Fusion? Need high temperature (~100 million K) to fuse atoms
Deuterium Tritium + 3 He4 Neutron 2 Need high temperature (~100 million K) to fuse atoms good confinement ITER: fusion experiment under construction

5 Alternate Magnetic Confinement Configuration
Field-Reversed Configuration (FRC) What's so great about FRC? Potential fusion reactor Simpler design than tokamak with better wall interaction Can possibly refuel tokamaks Study fast magnetic reconnection (basic science)

6 FRX-L: an FRC Experiment
Field Reversed Experiment-Liner Located at Los Alamos National Laboratory Anomalous flux dissipation observed; possibly caused by lower hybrid drift instability Expected characteristic of the density fluctuation: λ = 26 μm Guess: ñ/n = 1%

7 Study of Density Fluctuation – Laser Scattering Diagnostic
Detectors Plasma θ z Radius of Curvature Wavefront Beam Diameter Beam Divergence Gaussian Beam Diffraction Grating d φ mλ

8 Design Consideration: Laser
Wavelength: nm (HeNe) High power: 17mW Beam pointing stability: <0.002° small compared to scattering angle θ Beam diameter: 0.96mm not too big and not too small Beam divergence: 0.05° Polarization: Linear

9 Design Consideration: Detector
Power ratio : 2 x 10-5 Scattered power Ps: 3x10-7 W Size: Φ 0.23 mm compact, with active area similar to beam size (~ Φ2mm) Fast-responding: ≥ 20 MHz (fNyquist of digitizer) Noise Equivalent Power (NEP): 2.82x10-11 W as low as possible Signal-to-Noise Ratio (SNR): 1.2x104 SNR = Ps/NEP > 10 Nyquist freq: half of sampling rate Mounted High-speed PIN Photodiode (13 DAH 001): 2.86e9 freq

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