title: Design and operation of a fast electromagnetic inductive massive gas injection valve for NSTX-U.
abstract: Results from the operation of an electromagnetic valve, that does not incorporate ferromagnetic materials, are presented. Image currents induced on a conducting disc placed near a pancake solenoid cause it to move away from the solenoid and open the vacuum seal. A new and important design feature is the use of Lip Seals for the sliding piston. The pressure rise in the test chamber is measured directly using a fast time response Baratron gauge. The valve injects over 200 Torr l of nitrogen in less than 3 ms, which remains unchanged at moderate magnetic fields.
authors.affiliation: William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA.
authors.forename: R
authors.initials: R
authors.lastname: Raman
authors.affiliation: William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA.
authors.forename: T R
authors.initials: TR
authors.lastname: Jarboe
authors.affiliation: William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Nelson
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: S P
authors.initials: SP
authors.lastname: Gerhardt
authors.affiliation: William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA.
authors.forename: W-S
authors.initials: WS
authors.lastname: Lay
authors.affiliation: William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA.
authors.forename: G J
authors.initials: GJ
authors.lastname: Plunkett