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Authors = Byonghoon Seo ORCID = 0000-0001-5782-5669

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12 pages, 3102 KiB  
Article
First Results from the Thomson Scattering Diagnostic on the Large Plasma Device
by Marietta Kaloyan, Sofiya Ghazaryan, Shreekrishna P. Tripathi, Walter Gekelman, Mychal J. Valle, Byonghoon Seo and Christoph Niemann
Instruments 2022, 6(2), 17; https://doi.org/10.3390/instruments6020017 - 7 Apr 2022
Cited by 8 | Viewed by 3877
Abstract
We present the first Thomson scattering measurements of electron density and temperature in the Large Plasma Device (LAPD), a 22 m long magnetized linear plasma device at the University of California Los Angeles (UCLA). The diagnostic spectrally resolves the Doppler shift imparted on [...] Read more.
We present the first Thomson scattering measurements of electron density and temperature in the Large Plasma Device (LAPD), a 22 m long magnetized linear plasma device at the University of California Los Angeles (UCLA). The diagnostic spectrally resolves the Doppler shift imparted on light from a frequency-doubled Nd:YAG laser when scattered by plasma electrons. A fiber array coupled to a triple-grating spectrometer is used to obtain high stray light rejection and discriminate the faint scattering signal from a much larger background. In the center of the plasma column, the measured electron density and temperature are about ne1.5×1013 cm3 and Te 3 eV, respectively, depending on the discharge parameters and in good agreement with Langmuir probe data. Optical design considerations to maximize photon count while minimizing alignment sensitivity are discussed in detail and compared to numerical calculations. Raman scattering off of a quartz crystal probe is used for an absolute irradiance calibration of the system. Full article
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