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TJ-II:Neutral Beam Injection: Difference between revisions
TJ-II:Neutral Beam Injection (view source)
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<ref>[http://www.new.ans.org/store/j_75 J. Guasp, M. Liniers, C. Fuentes, and G. Barrera, ''Thermal load calculations at TJ-II vacuum vessel under NBI,'' Fusion Tech., '''35''', pp. 32-41 (1999)]</ref> | <ref>[http://www.new.ans.org/store/j_75 J. Guasp, M. Liniers, C. Fuentes, and G. Barrera, ''Thermal load calculations at TJ-II vacuum vessel under NBI,'' Fusion Tech., '''35''', pp. 32-41 (1999)]</ref> | ||
<ref>[http://dx.doi.org/10.1016/j.fusengdes.2005.06.315 C. Fuentes et al, ''Neutral beam injection optimization at TJ-II'', Fusion Engineering and Design '''74''', Issues 1-4 (2005) 249-253]</ref> | <ref>[http://dx.doi.org/10.1016/j.fusengdes.2005.06.315 C. Fuentes et al, ''Neutral beam injection optimization at TJ-II'', Fusion Engineering and Design '''74''', Issues 1-4 (2005) 249-253]</ref> | ||
NBI1 is located in [[TJ-II:Sectors|sector]] D8. | NBI1 is located in [[TJ-II:Sectors|sector]] D8. | ||
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In order to keep reionization losses at an acceptable level, the maximum allowed pressure during the beam pulse is 10<sup>−4</sup> mbar, which requires an installed pumping speed of 350,000 l/s. Titanium getter pumps have been chosen as the primary vacuum system for these injectors. Base pressures in the range of 5 × 10<sup>−9</sup> mbar are attainable with titanium pump operation. | In order to keep reionization losses at an acceptable level, the maximum allowed pressure during the beam pulse is 10<sup>−4</sup> mbar, which requires an installed pumping speed of 350,000 l/s. Titanium getter pumps have been chosen as the primary vacuum system for these injectors. Base pressures in the range of 5 × 10<sup>−9</sup> mbar are attainable with titanium pump operation. | ||
<ref>[http://dx.doi.org/10.1016/S0042-207X(02)00208-7 M. Liniers et al, ''Vacuum system of the neutral beam injectors at the stellarator TJ-II'', Vacuum '''67''', Issues 3-4 (2002) 379-384]</ref> | <ref>[http://dx.doi.org/10.1016/S0042-207X(02)00208-7 M. Liniers et al, ''Vacuum system of the neutral beam injectors at the stellarator TJ-II'', Vacuum '''67''', Issues 3-4 (2002) 379-384]</ref> | ||
=== Calorimeter === | |||
A carbon fiber composite (CFC) target calorimeter has been installed 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. Direct conversion from temperature to power density is possible due to the independent thermocouple measurements on two adiabatically mounted copper buttons. With the combined thermographic and calorimetric measurements it has been possible to determine the power density distribution of the beams. | |||
<ref>[http://dx.doi.org/10.1016/j.fusengdes.2007.07.054 C. Fuentes et al, ''Power transmission of the neutral beam heating beams at TJ-II'', Fusion Engineering and Design '''82''', Issues 5-14 (2007) 926-932]</ref> | |||
==References== | ==References== | ||
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