Study of low-frequency density fluctuations in the PETULA B tokamak by sub-millimetre laser interferometry

SIGLEAvailable from CEN Saclay, Service de Documentation, 91191 - Gif-sur-Yvette Cedex (France) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Simple Emittance Measurement of H- Beams from a Large Plasma Source

"An emittance meter is developed using pepper-pot method. Kapton foils are used to detect intensity distributions of small beamlets at the ""image"" plane of the pepper-pot. Emittance of H^- beams from a large plasma source for the neutral beam injector of the Large Helical Device (LHD) has been measured The normalized emittance (95%) of a 6 mA H^- beam with emission current density of about 10 mA/cm^2 is ~ 0.59 mm mrad. The present system is very simple, and it eliminates many complexities of the existing schemes.