TJ-II:Neutral Beam Injection: Difference between revisions

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TJ-II:Neutral Beam Injection (view source)

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additional heating for central electron densities up to 1.6×10<sup>20</sup>
additional heating for central electron densities up to 1.6×10<sup>20</sup>
m<sup>-3</sup>.
m<sup>-3</sup>.
<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>J. Guasp, M. Liniers, ''Theoretical evaluations of Neutral beam Injection efficiency for the TJ-II helical-axis stellarator'', [http://www.ans.org/store/j_30199 Fusion technology '''24''', 3, 251 (1993)]</ref>
<ref>[[doi: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>J. Guasp, M. Liniers, ''Loss cone structure for ions in the TJ-II helical axis stellarator. Part I: properties without a radial electric field'', [[doi:10.1088/0029-5515/40/3/309|Nucl. Fusion '''40''' (2000) 397-409]]</ref>
<ref>[[doi:10.1016/j.fusengdes.2013.04.014|M. Liniers, G. Wolfers,J.A. Sebastián, et al, ''Beamline duct monitoring of the TJ-II neutral beam injectors'', Fusion Engineering and Design '''88''', Issues 6-8 (2013), 960–963]]</ref>
<ref>J. Guasp, M. Liniers, ''Loss cone structure for ions in the TJ-II helical axis stellarator. Part II: radial electric field effects'', [[doi:10.1088/0029-5515/40/3/310|Nucl. Fusion '''40''' (2000) 411-427]]</ref>
<ref>J. Guasp, M. Liniers, C. Fuentes, and G. Barrera, ''Thermal load calculations at TJ-II vacuum vessel under NBI,'' [http://www.new.ans.org/store/j_75 Fusion Tech., '''35''', pp. 32-41 (1999)]</ref>
<ref>C. Fuentes et al, ''Neutral beam injection optimization at TJ-II'', [[doi:10.1016/j.fusengdes.2005.06.315|Fusion Engineering and Design '''74''', Issues 1-4 (2005) 249-253]]</ref>
<ref>M. Liniers, G. Wolfers,J.A. Sebastián, et al, ''Beamline duct monitoring of the TJ-II neutral beam injectors'', [[doi:10.1016/j.fusengdes.2013.04.014|Fusion Engineering and Design '''88''', Issues 6-8 (2013), 960–963]]</ref>


NBI1 is located in [[TJ-II:Sectors|sector]] D8.
NBI1 is located in [[TJ-II:Sectors|sector]] D8.
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The two high voltage power supplies feeding the acceleration grids of the injectors are of the transformer–rectifier type, taking their primary energy from a pulsed [[TJ-II:Power supply|flywheel generator]], and are coupled to the acceleration grids through a switching device.
The two high voltage power supplies feeding the acceleration grids of the injectors are of the transformer–rectifier type, taking their primary energy from a pulsed [[TJ-II:Power supply|flywheel generator]], and are coupled to the acceleration grids through a switching device.
<ref>[[doi:10.1016/S0920-3796(01)00389-1|J. Alonso et al, ''High voltage power supplies for the neutral beam injectors of the stellarator TJ-II'', Fusion Engineering and Design '''56-57''' (2001) 693-697]]</ref>
<ref>J. Alonso et al, ''High voltage power supplies for the neutral beam injectors of the stellarator TJ-II'', [[doi:10.1016/S0920-3796(01)00389-1|Fusion Engineering and Design '''56-57''' (2001) 693-697]]</ref>


=== Control system ===
=== Control system ===
The NBI system has its own control system, based on [[:Wikipedia:VMEbus|VMEbus]], with controller boards running the [[:Wikipedia:OS9|OS9]] real-time operating system.
The NBI system has its own control system, based on [[:Wikipedia:VMEbus|VMEbus]], with controller boards running the [[:Wikipedia:OS9|OS9]] real-time operating system.
<ref>[[doi:10.1016/S0920-3796(01)00349-0|L. Martínez-Laso et al, ''TJ-II neutral beam injectors control and data acquisition system'', Fusion Engineering and Design '''56-57''' (2001) 477-480]]</ref>
<ref>L. Martínez-Laso et al, ''TJ-II neutral beam injectors control and data acquisition system'', [[doi:10.1016/S0920-3796(01)00349-0|Fusion Engineering and Design '''56-57''' (2001) 477-480]]</ref>
<ref>[[doi:10.1016/j.fusengdes.2006.04.014|R. Carrasco et al, ''The NBI control system for the TJ-II'', Fusion Engineering and Design '''81''', Issues 15-17 (2006) 1813-1816]]</ref>
<ref>R. Carrasco et al, ''The NBI control system for the TJ-II'', [[doi:10.1016/j.fusengdes.2006.04.014|Fusion Engineering and Design '''81''', Issues 15-17 (2006) 1813-1816]]</ref>


=== Vacuum system ===
=== Vacuum system ===
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 &times; 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 &times; 10<sup>−9</sup> mbar are attainable with titanium pump operation.
<ref>[[doi: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>M. Liniers et al, ''Vacuum system of the neutral beam injectors at the stellarator TJ-II'', [[doi:10.1016/S0042-207X(02)00208-7|Vacuum '''67''', Issues 3-4 (2002) 379-384]]</ref>


=== Calorimeter ===
=== Calorimeter ===
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[[File:TJ-II NBI Calorimeter.jpg|400px|thumb|right|The target calorimeter (red) in its operating position. Only part of the vacuum vessel is shown. The neutral beam is injected from the right. The infrared (IR) camera (below) views the calorimeter via a mirror]]
[[File:TJ-II NBI Calorimeter.jpg|400px|thumb|right|The target calorimeter (red) in its operating position. Only part of the vacuum vessel is shown. The neutral beam is injected from the right. The infrared (IR) camera (below) views the calorimeter via a mirror]]
A carbon fiber composite (CFC) target calorimeter has been installed to study the power density distribution of the neutral beams in situ. The thermographic print of the beam can be recorded using an infrared camera, permitting a reliable analysis due to the highly anisotropic thermal conductivity of the target material. Direct conversion from temperature to power density is possible due to 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.
A carbon fiber composite (CFC) target calorimeter has been installed to study the power density distribution of the neutral beams in situ. The thermographic print of the beam can be recorded using an infrared camera, permitting a reliable analysis due to the highly anisotropic thermal conductivity of the target material. Direct conversion from temperature to power density is possible due to 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://link.aip.org/link/?RSINAK/77/10E519/1 C. Fuentes et al, ''Thermographic calorimetry of the neutral beam injectors heating beams at TJ-II'', Rev. Sci. Instrum. '''77''' (2006) 10E519]</ref>
<ref>C. Fuentes et al, ''Thermographic calorimetry of the neutral beam injectors heating beams at TJ-II'', [http://link.aip.org/link/?RSINAK/77/10E519/1 Rev. Sci. Instrum. '''77''' (2006) 10E519]</ref>
<ref>[[doi: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>
<ref>C. Fuentes et al, ''Power transmission of the neutral beam heating beams at TJ-II'', [[doi:10.1016/j.fusengdes.2007.07.054|Fusion Engineering and Design '''82''', Issues 5-14 (2007) 926-932]]</ref>


==References==
==References==
<references />
<references />
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