Neutral beam injection optimization at TJ-II

Fuentes, C.; Liniers, M.; Wolfers, G.; Alonso, Javier; Marcon, Gianluca; Carrasco, R. C.; Guasp, J.; Acedo, M.; Sánchez, E.; Medrano, M.; Díaz, Antonio; Doncel, J.; Alejaldre, C.; Tsai, C. C.; Barber, G. C.; Sparks, D. O.

doi:10.1016/j.fusengdes.2005.06.315

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…In the early phase of the ORNLICIEMA T collaboration, two ORNL neutral beam injectors (NBls) and ion sources were loaned to CIEMAT, through a contract with the U.S. Department of Energy. Thus, the NBI at TJ-II consists of two tangential injectors in the co-counter configuration [13]. At present, each NBI provides up to 450 kW of additional heating (tNBI ::; 100 ms) and, as a result, plasmas with ne(O) ::; 5 x 10 19 m-3 have been attained with a lithium coating on the vacuum vessel wall [12].…”

Section: Introductionmentioning

confidence: 99%

A new four-barrel pellet injection system for the TJ-II stellarator

Combs

Foust

McGill

et al. 2011

2011 IEEE/NPSS 24th Symposium on Fusion Engineering

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A new pellet injection system for the T J-II stellarator has been developed/constructed as part of a collaboration between the Oak Ridge National Laboratory (ORNL) and the Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT). ORNL is providing most of the injector hardware and instrumentation, the pellet diagnostics, and the pellet transport tubes; ClEM AT is responsible for the injector stand/interface to the stellarator, cryogenic refrigerator, vacuum pumps/ballast volumes, gas manifolds, remote operations, plasma diagnostics, and data acquisition. The pellet injector design is an upgraded version of that used for the ORNL injector installed on the Madison Symmetric Torus (MST). It is a four-barrel system equipped with a cryogenic refrigerator for in situ hydrogen pellet formation and a combined mechanical punch/propellant valve system for pellet acceleration (speeds -100 to 1000 m/s). On T J-II, it will be used as an active diagnostic and for fueling. To accommodate the plasma experiments planned for T J-II, pellet sizes significantly smaller than those typically used for the MST application are required. The system will initially be equipped with four different pellet sizes, with the gun barrel bores ranging between -0.5 to 1.0 mm. The new system is almost complete and is described briefly here, highlighting the new features added since the original MST injector was constructed. Also, the future installation on TJ-I1 is reviewed.

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Section: Introductionmentioning

confidence: 99%

A new four-barrel pellet injection system for the TJ-II stellarator

Combs

Foust

McGill

et al. 2011

2011 IEEE/NPSS 24th Symposium on Fusion Engineering

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“…The project of the NBI system at 2 × 2 MW/100 s for EAST, started in 2008, will be completed in 2011. As one of the important sub-systems, its power supply [4,5] with a transmission line [6,7] (shown in Fig. 1) was designed in 2009 and will be built up in 2010.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of the Iron Core as the Arc Snubber in the EAST NBI System

Yiyun

Wang

et al. 2010

Plasma Sci. Technol.

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A special winding iron-core is designed to act as the snubber for the neutral beam injection (NBI) power supply (PS) system in EAST, which will limit the fault current and energy caused by occasional sparking in the NBI ion source. 50-50 Ni-Fe is chosen as the high-frequency magnetization material for the iron-core. Equations for the snubber is derived from the design of the iron-core. The iron-loss factor and eddy-current losses are found to increase in a sample experiment at a frequency from 1 kHz to 20 kHz. A 1:10 miniature of the iron-core is tested and performs well with a fine capability.

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