H α detector system for the Helically Symmetric Experiment
2004; American Institute of Physics; Volume: 75; Issue: 9 Linguagem: Inglês
10.1063/1.1784562
ISSN1527-2400
AutoresStefan Gerhardt, J.M. Canik, D. T. Anderson, L.W. Owen,
Tópico(s)Superconducting Materials and Applications
ResumoA system of absolutely calibrated Hα detectors for neutral hydrogen monitoring has been designed and implemented for the Helically Symmetric eXperiment. An array of detectors at fixed poloidal angle but many toroidal angles yields a measurement of the toroidal asymmetry in Hα emission and is used for monitoring hydrogen recycling. A multichord array at the toroidal angle of the gas puff allows an accurate determination of neutral gas penetration. Preliminary neutral gas modeling allows for the estimation of the density of atomic and molecular hydrogen from the Hα emission, which are used for particle transport and flow damping studies.
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