A 2.45 GHz multicusp ECR-ion source for neutral-beam diagnostics at the tokamak TEXTOR
In order to implement a new setup for neutral-beam activated impact excitation spectroscopy at the nuclear fusion experiment TEXTOR (Tokamak Experiment for Technology Oriented Research) a 2.45 GHz ECR multicusp ion source was built. Special emphasis was given to the extraction of an intense He(+) ion beam. After neutralisation, the slow (2.2 x 1.0 E7 cm/s, 1 keV) He atoms are injected into the tokamak plasma. The atom beam needs to have a small divergence. To optimise the extraction optics, calculations concerning the multihole extraction aperture have been made, taking different ECR-plasma parameters into account. The divergence shows a strong dependence on the extracted beam current density (greater than 5 mA/cm2) and the chosen optics. The ion source has to be operated in a pulsed mode (max. 5 kHz, duty cycle 50%) due to experimental constraints.
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 63 (1992) No. 4, pp. 2544-2546
Record Number: 199211066 / Last updated on: 1994-11-29
Original language: en
Available languages: en