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The paper summarizes the technical and experimental efforts on Diagnostic Neutral Beam Injector (DNBI) [1,2] application on the TCV (Tokamak à Configuration Variable) [3-5]. The main task of the DNBI is to provide together with Charge exchange Recombination Spectroscopy (CXRS) [2] a local measurement of plasma ion temperature, velocity and impurity density. A series of DNBI technical upgrades was undertaken to increase the neutral beam current density in the observation region, which was required to extend the operational range of the CXRS diagnostic. The aim of DNBI upgrade, presented in this paper, is to increase the full energy beam current density in plasma by a factor of 2. A new ion source was installed on DNBI with corresponding changes in power supplies. The diameter of RF cylindrical plasma box and the extraction area of ion optical system were also increased; the full energy (52 keV) beam fraction was increased from 0.5 to 1 A.

Additional information

Authors: KARPUSHOV A N ET AL, Association EURATOM-Confédération Suisse, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);ABDRASHITOV G F ET AL, Budker Institute of Nuclear Physics, Novosibirsk (RU)
Bibliographic Reference: An oral report given at: 22nd Symposium on Fusion Technology (SOFT) Organised by: Association Euratom-Tekes Held at: Helsinki (FI), 9-13 September 2002
Availability: Available online at: It is also published in report LRP 733/02, available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6
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