Noninvasive THz-TDS measurements of plasma bounded and optically shielded by Hall thruster wall material

Brown, Nathan P.; Eladl, Muhannad M.; Steinberg, Adam M.; Deibel, Jason A.; Walker, Mitchell L. R.

doi:10.1088/1361-6595/ac12be

Noninvasive THz-TDS measurements of plasma bounded and optically shielded by Hall thruster wall material

Journal Article · Thu Jul 29 00:00:00 EDT 2021 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ac12be· OSTI ID:1822225

^[1]; Eladl, Muhannad M. ^[2]; ^[2]; Deibel, Jason A. ^[3]; Walker, Mitchell L. R. ^[2]

Georgia Inst. of Technology, Atlanta, GA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Wright State Univ., Dayton, OH (United States)

We experimentally demonstrate the capability of terahertz time-domain spectroscopy (THz-TDS) to noninvasively measure the electron density and collision frequency of plasma bounded and optically shielded by Hall thruster wall material. This paper augments the standard THz-TDS plasma diagnostic theory to account for plasma boundaries, presents THz optical property measurements of three different wall materials (grades M, M26, and HP boron nitride composite), and provides electron density and collision frequency measurements of an inductively coupled plasma bounded and optically shielded by each wall material. We find that the electron density measurement capability is weakly impacted by the boundaries, whereas the electron collision frequency measurement capability is strongly reduced by the boundaries. Here, the bounded plasma electron density trends deviate substantially from those of the unbounded plasma.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: National Science Foundation Graduate Research Fellowship; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1822225

Report Number(s):: SAND--2021-8516J; 697173

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 7 Vol. 30; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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