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Transmission of the Neutral Beam Heating Beams at TJ-II; Transmision del Haz de Neutros de Calentamiento en TJ-II

Abstract

Neutral beam injection heating has been development for the TJ-II stellarator. The beam has a port-through power between 700-1500 kW and injection energy 40 keV. The sensibility of the injection system to the changes of several parameters is analysed. Beam transmission is limited by losses processes since beam is born into the ions source until is coming into the fusion machine. For the beam transmission optimization several beam diagnostics have been developed. A carbon fiber composite (CFC) target calorimeter has been installed at TJ-II to study in situ the power density distribution of the neutral beams. The thermographic print of the beam can be recorded and analysed in a reliable way due to the highly anisotropic thermal conductivity of the target material. With the combined thermographic and calorimetric measurements it has been possible to determine the power density distribution of the beam. It has been found that a large beam halo is present, which can be explained by the extreme misalignment of the grids. This kind of halo has a deleterious effect on beam transport and must be minimized in order to improve the plasma heating capability of the beams. (Author) 155 refs.
Authors:
Publication Date:
Sep 27, 2007
Product Type:
Technical Report
Report Number:
CIEMAT-1116
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NEUTRAL ATOM BEAM INJECTION; PLASMA HEATING; TOKAMAK DEVICES; INFRARED THERMOGRAPHY; BEAM TRANSPORT; CARBON FIBERS
OSTI ID:
20930124
Research Organizations:
Centro de Investigaciones Energeticas Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)
Country of Origin:
Spain
Language:
Spanish
Other Identifying Numbers:
TRN: ES07B0490
Availability:
Commercial reproduction prohibited; OSTI as DE20930124
Submitting Site:
SPN
Size:
195 pages
Announcement Date:
Sep 27, 2007

Citation Formats

Fuentes Lopez, C. Transmission of the Neutral Beam Heating Beams at TJ-II; Transmision del Haz de Neutros de Calentamiento en TJ-II. Spain: N. p., 2007. Web.
Fuentes Lopez, C. Transmission of the Neutral Beam Heating Beams at TJ-II; Transmision del Haz de Neutros de Calentamiento en TJ-II. Spain.
Fuentes Lopez, C. 2007. "Transmission of the Neutral Beam Heating Beams at TJ-II; Transmision del Haz de Neutros de Calentamiento en TJ-II." Spain.
@misc{etde_20930124,
title = {Transmission of the Neutral Beam Heating Beams at TJ-II; Transmision del Haz de Neutros de Calentamiento en TJ-II}
author = {Fuentes Lopez, C}
abstractNote = {Neutral beam injection heating has been development for the TJ-II stellarator. The beam has a port-through power between 700-1500 kW and injection energy 40 keV. The sensibility of the injection system to the changes of several parameters is analysed. Beam transmission is limited by losses processes since beam is born into the ions source until is coming into the fusion machine. For the beam transmission optimization several beam diagnostics have been developed. A carbon fiber composite (CFC) target calorimeter has been installed at TJ-II to study in situ the power density distribution of the neutral beams. The thermographic print of the beam can be recorded and analysed in a reliable way due to the highly anisotropic thermal conductivity of the target material. With the combined thermographic and calorimetric measurements it has been possible to determine the power density distribution of the beam. It has been found that a large beam halo is present, which can be explained by the extreme misalignment of the grids. This kind of halo has a deleterious effect on beam transport and must be minimized in order to improve the plasma heating capability of the beams. (Author) 155 refs.}
place = {Spain}
year = {2007}
month = {Sep}
}