A joint Institute of the College of Computer, Mathematical and Physical Sciences and the A. James Clark School of Engineering |
Previous multi-chord measurements of the Hydrogen Balmer-alpha emission line on the Maryland Centrifugal eXperiment have motivated the implementation of more chord measurements for the purpose of increasing the spatial resolution of the emission profile measurement. However, before serious experimental campaigns can be waged, three pressing issues must be resolved. First, plasma has been observed outside the expected last-good-flux-surface (lgfs) which may be linked to high Alfvén Mach numbers. Second, absolute sensitivity calibrations must be performed for each chord. Third, spectral reflections from the interior of the vacuum vessel must be characterized. These issues and their impact on the multi-chord H-alpha emission diagnostic will be discussed.