Abstract
A diagnostic neutral beam injector has been developed at BINP for beam emission spectroscopy measurements in TCV tokamak, Lausanne, Switzerland. The beam has been commissioned in 1999. It operates with a beam energy of up to 50 keV, equivalent neutral beam current (for hydrogen) up to 1 A and pulse duration up to 2 s. Plasma in the ion source is produced by inductively coupled 4.6 MHz radio-frequency discharge. Ions are extracted and accelerated by a four-grid ion optical system with 163 circular 4 mm i.d. apertures. The beam is to provide local measurements of plasma ion temperature, velocity, and impurity densities through active charge exchange recombination spectroscopy. The beam parameters of the diagnostic injector enabled to carry out the measurements at plasma density up to 5×1019 m−3. In order to improve signal to noise ratio in the charge exchange recombination spectroscopy (CXRS) measurements and extend the operational density up to 1020 m−3, the diagnostic injector has been upgraded in 2002. As a result, the neutral beam fraction of full energy was increased from 0.5 to 1 equivalent A (eq A). This paper describes the results of the beam parameters measurements after upgrade.
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