Laser blow-off with photodiode detection system at the helically symmetric experiment

Castillo, J. F.; Clark, C.; Bader, A.; Likin, K. M.; Anderson, D. T.; Geiger, B.; Kumar, S. T. A.; Swee, C.

doi:10.1088/1748-0221/16/11/p11007

Title: Laser blow-off with photodiode detection system at the helically symmetric experiment

Journal Article · Mon Nov 01 00:00:00 EDT 2021 · Journal of Instrumentation

DOI:https://doi.org/10.1088/1748-0221/16/11/p11007· OSTI ID:1979428

Castillo, J. F.; Clark, C.; Bader, A.; Likin, K. M.; Anderson, D. T.; Geiger, B.; Kumar, S. T. A.; Swee, C.

Abstract A laser blow-off (LBO) system has been installed in the HSX stellarator to investigate impurity transport. A Nd:YAG laser is used to ablate a target area on a glass slide that has been coated with a thin film of aluminum and rapidly deposits a small, controlled quantity of aluminum atoms into HSX plasma. To study the radial propagation and confinement of the injected aluminum impurities, time-resolved emission measurements are made using a 20 channel AXUV photodiode detection system. The LBO system has achieved its design purpose, most notably the ability to make controlled impurity injection without significant perturbation to the background plasma. A detailed description of the setup as well as initial results of operation are presented.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-93ER54222

OSTI ID:: 1979428

Journal Information:: Journal of Instrumentation, Vol. 16, Issue 11; ISSN 1748-0221

Publisher:: Institute of Physics (IOP)

Country of Publication:: United States

Language:: English

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