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PRODID:-//Memento EPFL//
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SUMMARY:Gyrotron physics from linear to chaotic regimes: experiment and nu
 merical modeling
DTSTART:20160307T103000
DTEND:20160307T113000
DTSTAMP:20260510T075051Z
UID:32b7bfae6224b3bebd34d973ddaaf64ba2065567926328b1cf84eaa2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Falk Braunmueller\, SPC-EPFL\nGyrotrons\, which are mainly dev
 eloped as a coherent radiation source for plasma-heating (P_rf=0.1-1MW\, f
 _rf=50-170GHz)\, are also increasingly used in Nuclear Magnetic Resonance 
 (NMR)  spectroscopy\, where a dramatic enhancement in sensitivity can be 
 achieved via Dynamic Nuclear Polarization (DNP).\nA gyrotron prototype dev
 eloped at SPC/EPFL for the DNP-application will be described and analyzed 
 in detail. The DNP-gyrotron\, which has a maximum RF-power of 150W and an 
 RF-frequency that is tunable over a small range around 260GHz\, has demons
 trated to be an ideal test-bench for fundamental research on the beam-wave
  interaction process.\nThe main topic of this presentation concentrates on
  the experimental measurements and numerical modeling of novel non-station
 ary regimes\, characterized by a multi-frequency spectrum and a nanosecond
 -modulated RF-power. For appropriately modeling these regimes\, a novel si
 mulation code has been developed\, based on a more generally valid model. 
 In an experiment-theory comparison\, the code has already proven its capab
 ility for reproducing and interpreting the experimental results.
LOCATION:PPB 019
STATUS:CONFIRMED
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