TJ-II:Neutral Beam Injection: Difference between revisions
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<ref>[http://dx.doi.org/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>[http://dx.doi.org/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>[http://dx.doi.org/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>[http://dx.doi.org/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> | ||
=== 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 × 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> | |||
==References== | ==References== | ||
<references /> | <references /> | ||
Revision as of 17:54, 24 September 2009
TJ-II disposes of two neutral beam injectors (NBI), each of which can produce ≤ 300 ms pulses of neutral hydrogen accelerated to 40 keV, to provide up to 1.2 MW of absorbed additional heating for central electron densities up to 1.6×1020 m-3. [1] [2] [3]
NBI1 is located in sector D8. NBI2 is located in sector C1.
Power supply
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 flywheel generator, and are coupled to the acceleration grids through a switching device. [4]
Control system
The NBI system has its own control system. [5] [6]
Vacuum system
In order to keep reionization losses at an acceptable level, the maximum allowed pressure during the beam pulse is 10−4 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 × 10−9 mbar are attainable with titanium pump operation. [7]
References
- ↑ 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)
- ↑ C. Fuentes et al, Neutral beam injection optimization at TJ-II, Fusion Engineering and Design 74, Issues 1-4 (2005) 249-253
- ↑ 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
- ↑ 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
- ↑ L. Martínez-Laso et al, TJ-II neutral beam injectors control and data acquisition system, Fusion Engineering and Design 56-57 (2001) 477-480
- ↑ R. Carrasco et al, The NBI control system for the TJ-II, Fusion Engineering and Design 81, Issues 15-17 (2006) 1813-1816
- ↑ M. Liniers et al, Vacuum system of the neutral beam injectors at the stellarator TJ-II, Vacuum 67, Issues 3-4 (2002) 379-384