Development of a LIBS system for in situ surface measurements during plasma exposure in PISCES-A

Nishijima, D.; Patino, M.; Doerner, R. P.

doi:10.1063/1.5034349

Development of a LIBS system for in situ surface measurements during plasma exposure in PISCES-A

Journal Article · Sun Jul 01 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5034349· OSTI ID:1609934

Nishijima, D. ^[1]; Patino, M. ^[2]; Doerner, R. P. ^[2]

Univ. of California, San Diego, CA (United States); DOE/OSTI
Univ. of California, San Diego, CA (United States)

A laser-induced breakdown spectroscopy (LIBS) system has been developed with a Q-switched Nd:YAG laser (wavelength = 1064 nm and pulse width ~5 ns) to conduct in situ surface measurements during plasma exposure in the PISCES-A linear divertor plasma simulator. The LIBS signal enhancement is obtained with both the magnetic field normal to the surface of a target and steady-state background plasma. Migration of sputtered Ta impurities onto the neighboring Cr surface is identified during He plasma exposure, only when cone structures are formed on the Cr surface. D retention in W during D plasma exposure is observed to decrease with increasing the sample temperature. The temporal evolution of D outgassing from W is measured in a time range of ~10-420 s right after D plasma exposure. A power law fit, t^-α, yields α ~ 0.34 ± 0.09, which is nearly consistent with calculated and measured values.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER54912

OSTI ID:: 1609934

Alternate ID(s):: OSTI ID: 1460025

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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