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Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer

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A new fast-ion D(alpha) diagnostic for DIII-D.

W W Heidbrink¹, Y Luo, C M Muscatello

¹University of California, Irvine, California 92697, USA. bill.heidbrink@uci.edu

The Review of Scientific Instruments

|December 3, 2008

Summary

The new fast-ion D(alpha) (FIDA) diagnostic improves measurements by minimizing background light interference. This enhanced design focuses on specific fast-ion populations in fusion plasmas.

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Area of Science:

Nuclear Fusion Energy
Plasma Physics
Spectroscopy

Background:

The fast-ion D(alpha) (FIDA) technique uses Doppler-shifted Balmer-alpha light to measure energetic ion density in fusion plasmas.
Operational experience with the initial DIII-D FIDA diagnostic highlighted background light as a primary source of measurement uncertainty.
Plasma instabilities can cause dynamic changes in background light, significantly impacting FIDA measurement accuracy.

Purpose of the Study:

To guide the design of a second-generation FIDA instrument based on lessons learned from the first DIII-D diagnostic.
To minimize measurement uncertainties caused by background light, particularly from cold D(alpha) light scattering and injected neutral beams.
To optimize FIDA sightlines for enhanced sensitivity to specific fast-ion populations.

Main Methods:

Minimizing the scattering of cold D(alpha) light into the diagnostic.
Implementing a new sightline with a toroidal component to isolate blueshifted fast-ion light.
Monitoring background light levels to account for residual interference.

Main Results:

The new instrument design effectively minimizes interference from cold D(alpha) light.
The toroidal sightline successfully separates fast-ion light from injected neutral beam emissions.
The modified views demonstrate increased sensitivity to co-current circulating fast ions.

Conclusions:

The second-generation FIDA diagnostic design addresses key limitations of the first instrument, particularly background light noise.
The new design enhances the ability to accurately infer fast-ion density by improving signal-to-noise ratio.
Future FIDA instruments can benefit from these design criteria for more precise fast-ion measurements in fusion devices.