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Session C10 - Advances in Magnetic Confinement Fusion. ORAL session, Saturday afternoon, April 05 PowerPoint Presentation
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Session C10 - Advances in Magnetic Confinement Fusion. ORAL session, Saturday afternoon, April 05 Washington B, Loews Philadelphia Hotel [C10.009] High Speed Imaging of Edge Turbulence in Magnetic Fusion Plasmas Stewart Zweben (PPPL) Klaus Hallatschek (IPP Garching)

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slide1

Session C10 - Advances in Magnetic Confinement Fusion.

ORAL session, Saturday afternoon, April 05

Washington B, Loews Philadelphia Hotel[C10.009]

High Speed Imaging of Edge

Turbulence in Magnetic

Fusion Plasmas

Stewart Zweben (PPPL)

Klaus Hallatschek (IPP Garching)

John Lowrance (Princeton Scientific Instruments, Inc.)

Ricardo Maqueda (LANL), Daren Stotler (PPPL)

James Terry (MIT)

slide2

Images of NSTX Spherical Torus

1000 frames/sec @ 10 µsec exposure / frame

Visible line emission only from “cold” edge at T ≤ 50 eV

Plasma in core emits thermal x-rays at T ≥ 1 keV

slide3

What Causes Plasma Turbulence ?

• Large density or temperature gradient across B (≈ 1050K/cm)

• Linear “drift wave” instability grows with l ≈ 10riat g ≈ 106/sec

• Fast electron motion along B makes spatial structure ≈ 2-D

2-D  B

3-D

B

[Chen, Plasma Physics, 1984]

slide4

200

out

100

0

A Closer Look at NSTX

• Look at He1(587.6 nm) light from neutral gas puff  ne

• View along B field line to see 2-D structure  B

slide5

High Speed Imaging of NSTX Edge

[camera obtained from Princeton Scientific Instruments, NJ]

CCD camera with

100,000 frames/sec

at 10 µsec/frame

for 28 frames/shot

localized structures

move outward

at ≈ 105 cm/sec

slide6

Simulation of Plasma Turbulence

• Use 2-fluid equations in 3-D geometry

• Assume initial conditions and evolve

dB

dE

dn

dTi

dTe

dvII

radius

[Rogers, Drake, and Zeiler, PRL ‘98]

slide7

Experiment vs. Simulation

• Compare turbulence size (k=2π/l) spectrum vs. plasma

radius in Alcator C-Mod tokamak at MIT

Experiment

Simulation

k (cm-1)

k (cm-1)

radius

radius

radius

=> simulation reproduces average size scale to within x2

slide8

Where are We Going ?

Measure-

ments

Simulation

Theory

  • Increase red area to explain existing experiments
  • Determine optimum magnetic confinement system