15 research outputs found
New evidence and impact of electron transport non-linearities based on new perturbative inter-modulation analysis
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Handbuch zum 160 GHz Interferometer an W7-AS
No full textA newly designed 10-channel microwave interferometer for line integrated electron density measurements at the stellarator experiment W7-AS is described. The probing signals in the frequency range of 160-162 GHz are generated by Gunn-oscillators with subsequent frequency doublers. Double conversion heterodyne receivers with 2 MHz bandwidth are used for detection. All oscillators involved are phase-locked. Each Gunn-oscillator is used twofold: as source for the probing signal and as local oscillator for heterodyne detection. The dynamic range of the millimeter wave part is about 70 dB. The instrument operates up to a peak density of 7 x 10"1"9 m"-"3 with a temporal resolution of 5 #mu#s. The paper gives a detailed technical description of the system and demonstrates its usefulness by means of an experimental example. (orig.)SIGLEAvailable from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Electron cyclotron emission measurements during 28 GHz electron cyclotron resonance heating in Wendelstein WVII-A stellarator
No full textSIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Separation of transport in slow and fast time-scales using modulated heat pulse experiments (hysteresis in flux explained)
No full textHeat flux reconstruction and effective diffusion estimation from perturbative experiments using advanced filtering and confidence analysis
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