Scanning retarding field analyzer for plasma profile measurements in the boundary of the Alcator C-Mod tokamak

Journal Article · Fri Mar 15 00:00:00 EDT 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4793785· OSTI ID:22105453

Brunner, D.; LaBombard, B.; Ochoukov, R.; Whyte, D. ^[1]

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1. MIT PSFC Cambridge, Massachusetts 02139 (United States)

A new Retarding Field Analyzer (RFA) head has been created for the outer-midplane scanning probe system on the Alcator C-Mod tokamak. The new probe head contains back-to-back retarding field analyzers aligned with the local magnetic field. One faces 'upstream' into the field-aligned plasma flow and the other faces 'downstream' away from the flow. The RFA was created primarily to benchmark ion temperature measurements of an ion sensitive probe; it may also be used to interrogate electrons. However, its construction is robust enough to be used to measure ion and electron temperatures up to the last-closed flux surface in C-Mod. A RFA probe of identical design has been attached to the side of a limiter to explore direct changes to the boundary plasma due to lower hybrid heating and current drive. Design of the high heat flux (>100 MW/m{sup 2}) handling probe and initial results are presented.

• OSTI ID: 22105453
• Journal Information: Review of Scientific Instruments, Vol. 84, Issue 3; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALCATOR DEVICE
ELECTRON TEMPERATURE
ELECTRONS
HEAT FLUX
ION TEMPERATURE
IONS
LOWER HYBRID HEATING
MAGNETIC FIELDS
PLASMA
PLASMA DIAGNOSTICS
PLASMA RADIAL PROFILES
PROBES
TEMPERATURE MEASUREMENT