Fast Neutral Lithium Beam for Density and its Fluctuation Measurements at the Boundary Regions of ETE Tokamak

A Fast Neutral Lithium Beam Probe (FNLBP) is being developed, in order, to perform measurement of the boundary plasma density in discharges of the Spherical Tokamak ETE, recently built at LAP/INPE. This plasma diagnostic method is adequate for use in fusion devices because it does not perturb the plasma and it provides data with high space and time resolution for the entire discharge lifetime. To obtain reliable measurements, however, FNLB probing depends on high signal-to-noise ratio (S/N) during beam emission spectroscopy of the Li beam injected into the plasma, specially if density uctuation measurements are sought. Hence, our eort is been focused in the achievement of high intensity Li 0 output. Recently, probing of a low temperature (T 5eV) and low density target plasma (n 10 10 cm 3) produced in a plasma immersion ion implantation experiment (PIIIE) was performed by a 2-5keV FNLBP. The method used for the density determination of this glow discharge plasma was based on the comparison of the uxes of 6708 A photons emitted fro