title: Swinging reciprocating Mach probes for the high field side scrape-off layer in DIII-D.
abstract: A new pair of in situ reciprocating Mach probes termed swing probes has been deployed on the DIII-D centerpost for the 2012 experimental campaign. When not deployed, the entire assembly is housed in a <5 cm space underneath the centerpost tiles. This design is unique in that the probe swings vertically through the edge plasma, taking measurements along a 180° arc with a 20 cm radius. The motion is powered by actuator coils that interact with the tokamak's magnetic field. Two electrodes maintain a Mach-pair orientation throughout the swing and provide measurements of saturation current, electron temperature, and parallel flow speeds up to the separatrix.
authors.affiliation: University of Toronto Institute for Aerospace Studies, Canada. cedric@starfire.utias.toronto.ca
authors.forename: C K
authors.initials: CK
authors.lastname: Tsui
authors.forename: D A
authors.initials: DA
authors.lastname: Taussig
authors.forename: M G
authors.initials: MG
authors.lastname: Watkins
authors.forename: R L
authors.initials: RL
authors.lastname: Boivin
authors.forename: P C
authors.initials: PC
authors.lastname: Stangeby