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Magnetic Diagnostics for the Lithium Tokamak Experiment
(LTX) at PPPL
Andrew JonesPEI/GEC
Summer 2009
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Fusion, LTX, and Us Why is it useful?
How does it work?
What does LTX contribute?
What did I contribute to LTX?
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Fusion Energy
High energy per reaction Abundant, cheap fuel Safe Environmentally friendly Need three things:
High temperature (T) High density (n) Long confinement time (τ)
Image from www.atomicarchive.com
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Tokamaks
Changing magnetic fluxes accelerate particles
Magnetic fields provide confinement
Toroidal geometry-- no open ends
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LTX
Liquid lithium-walled tokamak
Flat temperature profile
Low recycling Decreased
structural damage
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Magnetic Diagnostics
Non-invasive sensors for data acquisition Changing magnetic fluxes cause voltage Hardware integrator circuits yield local
magnetic flux Digitizers output to computers Measured flux compared to calculated flux
for toroidally symmetric system (LRDFIT)
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Calibration
Integrator gains vary unpredictably
Gain factors obtained via comparison of simulated to measured flux
Only reliable where model captures behavior well
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Automation
Analyzed fit of model behavior to data Wrote calibration script to take in data from
LTX and check for regions of good behavior agreement
Calibration gain factor automatically calculated, output in readable format
Used in future to calibrate sensors via LRDFIT or new three-dimensional code
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Made possible by
Grant from PEI/Grand Energy Challenges initiative
Princeton Plasma Physics Laboratory Robert Kaita Jon Menard Laura Berzak
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Magnetic Diagnostics for the Lithium Tokamak Experiment
(LTX) at PPPL
Andrew JonesPEI/GEC
Summer 2009