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Title: The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor

Abstract

An array of flush-mounted and toroidally elongated Langmuir probes (henceforth called rail probes) have been specifically designed for the Alcator C-Mod’s vertical target plate divertor and operated over multiple campaigns. The “flush” geometry enables the tungsten electrodes to survive high heat flux conditions in which traditional “proud” tungsten electrodes suffer damage from melting. The toroidally elongated rail-like geometry reduces the influence of sheath expansion, which is an important effect to consider in the design and interpretation of flush-mounted Langmuir probes. The new rail probes successfully operated during C-Mod’s FY2015 and FY2016 experimental campaigns with no evidence of damage, despite being regularly subjected to heat flux densities parallel to the magnetic field exceeding ∼1 GW per square meter for short periods of time. A comparison between rail and proud probe data indicates that sheath expansion effects were successfully mitigated by the rail design, extending the use of these Langmuir probes to incident magnetic field line angles as low as 0.5 degree.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1878735
DOE Contract Number:  
SC0014264; FC02-99ER54512
Resource Type:
Data
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kuang, Adam, Brunner, Dan, LaBombard, Brian, Leccacorvi, Rick, and Vieira, Rui. The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor. United States: N. p., 2018. Web. doi:10.7910/DVN/4TVWRE.
Kuang, Adam, Brunner, Dan, LaBombard, Brian, Leccacorvi, Rick, & Vieira, Rui. The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor. United States. https://doi.org/10.7910/DVN/4TVWRE
Kuang, Adam, Brunner, Dan, LaBombard, Brian, Leccacorvi, Rick, and Vieira, Rui. 2018. "The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor". United States. https://doi.org/10.7910/DVN/4TVWRE. https://www.osti.gov/servlets/purl/1878735.
@article{osti_1878735,
title = {The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor},
author = {Kuang, Adam and Brunner, Dan and LaBombard, Brian and Leccacorvi, Rick and Vieira, Rui},
abstractNote = {An array of flush-mounted and toroidally elongated Langmuir probes (henceforth called rail probes) have been specifically designed for the Alcator C-Mod’s vertical target plate divertor and operated over multiple campaigns. The “flush” geometry enables the tungsten electrodes to survive high heat flux conditions in which traditional “proud” tungsten electrodes suffer damage from melting. The toroidally elongated rail-like geometry reduces the influence of sheath expansion, which is an important effect to consider in the design and interpretation of flush-mounted Langmuir probes. The new rail probes successfully operated during C-Mod’s FY2015 and FY2016 experimental campaigns with no evidence of damage, despite being regularly subjected to heat flux densities parallel to the magnetic field exceeding ∼1 GW per square meter for short periods of time. A comparison between rail and proud probe data indicates that sheath expansion effects were successfully mitigated by the rail design, extending the use of these Langmuir probes to incident magnetic field line angles as low as 0.5 degree.},
doi = {10.7910/DVN/4TVWRE},
url = {https://www.osti.gov/biblio/1878735}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Sep 19 00:00:00 EDT 2018},
month = {Wed Sep 19 00:00:00 EDT 2018}
}

Works referencing / citing this record:

The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor
journal, April 2018