title: Note: spectral motional Stark effect diagnostic for measurement of magnetic fields below 0.3 T.
abstract: The paper reports on development of the spectral motional Stark effect (MSE) diagnostic in the midplane of the gas dynamic trap (GDT) linear system for magnetic confinement of anisotropic hot-ion plasma. The axially symmetric GDT vacuum magnetic field has a minimum value in the midplane, which varies from 0.2 to 0.35 T in different regimes of operation. Buildup of 15 keV ion population generates a diamagnetic reduction of magnetic field in the plasma core of up to 30% in the maximum density region, as measured by the existing eight-line MSE diagnostic. Commissioning of the midplane MSE provided first direct measurements of diamagnetic modifications in the minimum magnetic field GDT section, a necessary complement to the understanding of equilibrium and self-organization of high-β plasmas in GDT. Making use of the stable short-pulse diagnostic beam and calibration of the apparent spectral width of beam emission lines allow for the measurement of the plasma magnetic field of 0.29 ± 0.007 T with the integration time of 200 μs.
authors.affiliation: Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Lizunov
authors.forename: A
authors.initials: A
authors.lastname: Donin
authors.forename: V
authors.initials: V
authors.lastname: Savkin