7th International Reflectometry Workshop for Fusion Plasma Diagnostics, 9-12 de Maio de 2005, Garching, Alemanha

	Frequency Hopping Millimeter-wave Reflectometry in ASDEX Upgrade
	L. Cupido, S. Graça, L. Meneses, J. Santos, M. Manso e F. Serra
	Resumo
	Millimeter-wave reflectometers to perform density fluctuations measurements have been for quite a long time either fixed frequency (heterodyne and homodyne) systems in tunable or traditional multi-channel fixed frequency arrangements. Only recently novel systems were brought into operation with the ability to hop from frequency to frequency over a large bandwidth, during each plasma discharge, while retaining the quality of fixed frequency phase locked sources. The new hopping reflectometer system recently installed at ASDEX upgrade to study the radial distribution of turbulence characteristics is here briefly described and the proposed operation schemes envisaged are detailed.