3 research outputs found
Overview on electrical issues faced during the SPIDER experimental campaigns
SPIDER is the full-scale prototype of the ion source of the ITER Heating
Neutral Beam Injector, where negative ions of Hydrogen or Deuterium are
produced by a RF generated plasma and accelerated with a set of grids up to
~100 keV. The Power Supply System is composed of high voltage dc power supplies
capable of handling frequent grid breakdowns, high current dc generators for
the magnetic filter field and RF generators for the plasma generation. During
the first 3 years of SPIDER operation different electrical issues were
discovered, understood and addressed thanks to deep analyses of the
experimental results supported by modelling activities. The paper gives an
overview on the observed phenomena and relevant analyses to understand them, on
the effectiveness of the short-term modifications provided to SPIDER to face
the encountered issues and on the design principle of long-term solutions to be
introduced during the currently ongoing long shutdown.Comment: 8 pages, 12 figures. Presented at SOFT 202
The ITER Neutral Beam Test Facility toward SPIDER operation
SPIDER is one of two projects of the ITER Neutral Beam Test Facility under construction in Padova, Italy, at the Consorzio RFX premises. It will have a 100 keV beam source with a full- size prototype of the radiofrequency ion source for the ITER neutral beam injector (NBI) and also, similar to the ITER diagnostic neutral beam, it is designed to operate with a pulse length of up to 3600 s, featuring an ITER-like magnetic lter eld con guration (for high extraction of negative ions) and caesium oven (for high production of negative ions) layout as well as a wide set of diagnostics. These features will allow a reproduction of the ion source operation in ITER, which cannot be done in any other existing test facility. SPIDER realization is well advanced and the rst operation is expected at the beginning of 2018, with the mission of achieving the ITER heating and diagnostic NBI ion source requirements and of improving its performance in terms of reliability and availability. This paper mainly focuses on the preparation of the rst SPIDER operations\u2014integration and testing of SPIDER components, completion and implementation of diagnostics and control and formulation of operation and research plan, based on a staged strategy