Multichannel
Tangential FIR Laser
Interferometer/Polarimeter for NSTX (FIReTIP)
Far-infrared (FIR) lasers are widely
utilized for interferometric/polarimetric measurements of plasma electron
density profiles and parallel magnetic field profiles in contemporary magnetic
fusion devices. UC Davis, in collaboration with PPPL, is developing a
seven-channel, Tangential Interferometer/Polarimeter (FIReTIP)
for The National
Spherical Torus Experiment (NSTX) in the Princeton
Plasma Physics Laboratory (PPPL). A triple
FIR laser configuration has been adopted for the system.
The objectives of this project are:
·
To provide
temporally and radially resolved electron density profile data for transport
and equilibrium studies in NSTX.
·
To provide
temporally and radially resolved toroidal field profile data for the study of
paramagnetism and diamagnetism in NSTX.
·
To measure
the plasma density fluctuations due to coherent waves (RF products, MHD modes
such as TAE, etc.) and incoherent waves (turbulence) in NSTX.
The FIReTIP system is presently operating on four of an eventual seven-channel system. Further information is available via the links below:
Principles of Interferometry/Polarimetry
The CO2/FIR Lasers for the FIReTIP System
Optical Layouts of the FIReTIP System
Phase Detection Electronics for the FIReTIP
System
Computer Simulations of Anticipated Performance
Recent Progress and Physics Results
Send comments
to: cwdomier@ucdavis.edu.