Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak

Brunner, D.; Kuang, A. Q.; LaBombard, B.; Burke, W.

doi:10.1063/1.4990043

Title: Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak

Journal Article · Wed Jul 05 00:00:00 EDT 2017 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4990043· OSTI ID:1474327

^[1];

^[1]; LaBombard, B. ^[1]; Burke, W. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

A new servomotor drive system has been developed for the horizontal reciprocating probe on the Alcator C-Mod tokamak. Real-time measurements of plasma temperature and density—through use of a mirror Langmuir probe bias system—combined with a commercial linear servomotor and controller enable self-adaptive position control. Probe surface temperature and its rate of change are computed in real time and used to control probe insertion depth. It is found that a universal trigger threshold can be defined in terms of these two parameters; if the probe is triggered to retract when crossing the trigger threshold, it will reach the same ultimate surface temperature, independent of velocity, acceleration, or scrape-off layer heat flux scale length. Finally, in addition to controlling the probe motion, the controller is used to monitor and control all aspects of the integrated probe drive system.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FC02-99ER54512

OSTI ID:: 1474327

Alternate ID(s):: OSTI ID: 1367935

Journal Information:: Review of Scientific Instruments, Vol. 88, Issue 7; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (20)

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Cited By (4)

Outlier classification using autoencoders: Application for fluctuation driven flows in fusion plasmas Kube, R.; Bianchi, F. M.; Brunner, D. Review of Scientific Instruments, Vol. 90, Issue 1 https://doi.org/10.1063/1.5049519	journal	January 2019
An experimental assessment of methods used to compute secondary electron emission yield for tungsten and molybdenum electrodes based on exposure to Alcator C-Mod scrape-off layer plasmas McCarthy, W.; LaBombard, B.; Brunner, D. Plasma Physics and Controlled Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1361-6587/aaa51c	journal	February 2018
Edge transport and mode structure of a QCM-like fluctuation driven by the Shoelace antenna Golfinopoulos, T.; LaBombard, B.; Brunner, D. Nuclear Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/1741-4326/aab2c8	journal	March 2018
Outlier classification using Autoencoders: application for fluctuation driven flows in fusion plasmas Kube, R.; Bianchi, F. M.; Brunner, D. arXiv https://doi.org/10.48550/arxiv.1804.08927	text	January 2018

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