title: Magnetic diagnostic suite of the C-2 field-reversed configuration experiment confinement vessel.
abstract: Magnetic measurements are a fundamental part of determining the size and shape of field-reversed configuration (FRC) plasmas in the C-2 device. The magnetic probe suite consists of 44 in-vessel and ex-vessel probes constructed using various technologies: ultra-high vacuum compatible mineral-insulated cable, nested triple axis coils hand-wound on ceramic bobbins, and commercial chip inductors mounted on printed circuit boards. Together, these probes measure the three-dimensional excluded flux profile of the FRC, which approximates the shape of the separatrix between the confined plasma volume and the scrape-off layer. High accuracy is achieved by using the extensive probe measurements to compensate for non-ideal effects such as flux leakage through the vacuum vessel and bulk motion of the FRC towards the wall. A subset of the probes is also used as a set of Mirnov arrays that provide sensitive detection of perturbations and oscillations of the FRC.
authors.affiliation: Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA. mthompson@trialphaenergy.com
authors.forename: M C
authors.initials: MC
authors.lastname: Thompson
authors.forename: J D
authors.initials: JD
authors.lastname: Douglass
authors.forename: P
authors.initials: P
authors.lastname: Feng
authors.forename: K
authors.initials: K
authors.lastname: Knapp
authors.forename: Y
authors.initials: Y
authors.lastname: Luo
authors.forename: R
authors.initials: R
authors.lastname: Mendoza
authors.forename: V
authors.initials: V
authors.lastname: Patel
authors.forename: M
authors.initials: M
authors.lastname: Tuszewski
authors.forename: A D
authors.initials: AD
authors.lastname: Van Drie