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Title: Langmuir probe diagnostic suite in the C-2 field-reversed configuration

Several in situ probes have been designed and implemented into the diagnostic array of the C-2 field-reversed configuration (FRC) at Tri Alpha Energy [M. Tuszewski et al. (the TAE Team), Phys. Rev. Lett. 108, 255008 (2012)]. The probes are all variations on the traditional Langmuir probe. They include linear arrays of triple probes, linear arrays of single-tipped swept probes, a multi-faced Gundestrup probe, and an ion-sensitive probe. The probes vary from 5 to 7 mm diameter in size to minimize plasma perturbations. They also have boron nitride outer casings that prevent unwanted electrical breakdown and reduce the introduction of impurities. The probes are mounted on motorized linear-actuators allowing for programmatic scans of the various plasma parameters over the course of several shots. Each probe has a custom set of electronics that allows for measurement of the desired signals. High frequency ( > 5MHz) analog optical-isolators ensure that plasma parameters can be measured at sub-microsecond time scales while providing electrical isolation between machine and data acquisition systems. With these probes time-resolved plasma parameters (temperature, density, spatial potential, flow, and electric field) can be directly/locally measured in the FRC jet and edge/scrape-off layer.
Authors:
; ; ;  [1] ;  [2]
  1. Tri Alpha Energy Inc., PO Box 7010, Rancho Santa Margarita, California 92688 (United States)
  2. Department of Modern Physics, University of Science and Technology of China, Hefei Anhui 230026 (China)
Publication Date:
OSTI Identifier:
22308612
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACTUATORS; BORON NITRIDES; DATA ACQUISITION SYSTEMS; DISTURBANCES; ELECTRIC FIELDS; ELECTRICAL FAULTS; ELECTRON TEMPERATURE; FIELD-REVERSED THETA PINCH DEVICES; ION TEMPERATURE; LANGMUIR PROBE; PLASMA; PLASMA DENSITY; PLASMA IMPURITIES; PLASMA JETS; PLASMA SCRAPE-OFF LAYER; TIME RESOLUTION