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First B-dot measurements in the RAID device, an alternative negative ion source for DEMO neutral beams
- Source :
- Fusion Eng.Des., 30th Symposium on Fusion Technology (SOFT-30), 30th Symposium on Fusion Technology (SOFT-30), Sep 2018, Messina, Italy. pp.1140-1144, ⟨10.1016/j.fusengdes.2019.02.025⟩, Fusion Engineering and Design
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- International audience; As a new concept of Neutral Beam Injectors (NBI) for DEMO-like reactors, SIPHORE (IRFM, CEA, in France) expects to extract negative deuterium ions and photo-neutralize the accelerated D-. The Swiss Plasma Center (SPC) of EPFL is involved in this project by developing an innovative helicon source, which could provide the adequate D 2 negative ion blade-shaped plasma, in terms of density and homogeneity along the axial direction. In the Resonant Antenna Ion Device (RAID), the test bed, a helicon wave is sustained by a resonant antenna plasma source at 13.56 MHz (input power ≤ 10 kW), connected to a cylindrical vacuum chamber (1.5 m long, 0.4 m diameter) and is surrounded by 6 Helmholtz coils, providing a DC magnetic field up to 800 G on axis. To characterize the helicon wave propagation, RAID has been recently equipped with a three-axis magnetic probe (B-dot). The paper describes the RAID experiment and its helicon source, including a 3D characterization of density and temperature, together with the B-dot design and calibration. It presents measurements of helicon wave propagation; in typical H 2 plasmas (0.3 Pa), preliminary results show a helicon wave right-handed polarized with a wavelength of approximately 240 mm.
- Subjects :
- Wave propagation
Source
01 natural sciences
010305 fluids & plasmas
Ion
Plasma
Optics
0103 physical sciences
General Materials Science
Wave
Resonant antenna
Civil and Structural Engineering
010302 applied physics
Physics
[PHYS]Physics [physics]
business.industry
Mechanical Engineering
Magnetic field
Helicon
Wavelength
B-dot
Nuclear Energy and Engineering
Vacuum chamber
Magnetic probe
business
Beam (structure)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Fusion Eng.Des., 30th Symposium on Fusion Technology (SOFT-30), 30th Symposium on Fusion Technology (SOFT-30), Sep 2018, Messina, Italy. pp.1140-1144, ⟨10.1016/j.fusengdes.2019.02.025⟩, Fusion Engineering and Design
- Accession number :
- edsair.doi.dedup.....d2d1dee2937914fe28684016ecab2649