title: An instrumental and numerical method to determine the hydrogenic ratio in isotopic experiments in the TJ-II stellarator.
abstract: The isotope effect is an important topic that is relevant for future D-T fusion reactors, where the use of deuterium, rather than hydrogen, may lean to improved plasma confinement. An evaluation of the ratio of hydrogen/deuterium is needed for isotope effect studies in current isotopic experiments. Here, the spectral range around Hα and Dα lines, obtained with an intensified multi-channel detector mounted to a 1-m focal length spectrometer, is analyzed using a fit function that includes several Gaussian components. The isotopic ratio evolution for a single operational day of the TJ-II stellarator is presented. The role of injected hydrogen by Neutral Beam Injection heating is also studied.
authors.affiliation: Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Baciero
authors.affiliation: Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Zurro
authors.affiliation: Departamento de Física, Universidad Carlos III de Madrid, Leganés, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Martínez