Implementation of multifilter based twin-prototypes for core electron temperature measurements in the TJ-II stellarator |
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Authors: | Baião D Medina F Ochando M A Varandas C Molinero A Chércoles J |
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Affiliation: | Associac?a?o EURATOM/IST, Instituto de Plasmas e Fusa?o Nuclear-Laborato?rio Associado, Instituto Superior Te?cnico, Av. Rovisco Pais, Lisboa 1049-001, Portugal. dbaiao@ipfn.ist.utl.pt |
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Abstract: | The design and preliminary results from a prototype of a multifilter based electron temperature diagnostic for the TJ-II stellarator are presented. The diagnostic consists of four photodiodes with filters of different thicknesses to determine the electron temperature in a wide variety of plasma compositions, thanks to the set of six different signal-pairs ratios available. The impurity transport code IONEQ, the TJ-II soft x-ray tomography, and the VUV survey diagnostics give the necessary information to assess the proposed diagnostic reliability. In parallel, a vacuum-compatible multichannel electronic board has been designed for a future linear array to determine electron temperature profiles in high-density plasmas. |
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