Laser-Based Diagnostic for Tracing Magnetic Field Lines in Spheromaks and Other Self-Organized Magnetically Confined Plasmas.

McLean, H. S. ; Hill, D. N. ; Rutov, D. D. ; Chen, H.

Technical Information Center Oak Ridge Tennessee

关键词: Plasmas;    Measurement testing;    Magnetically confined plasmas;    Magnetic field topology;    Laser-based diagnostics;   

RP-ID  :  DE200515013335

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We are in the process of testing a new technique for measuring the magnetic field-line topology in magnetically confined plasmas. The basic idea behind the FLIRT (Field Line TRacing) diagnostic is to use a high powerful short pulse laser to launch a burst of energetic (-100keV) electrons from a target passing through the plasma of interest; these electrons then generally follow field lines until they strike a solid surface, where a burst of x-rays is produced and then detected. The field line connection length can be determined from the time delay between the laser pulse and the burst of x-rays. The topology of the field lines can be inferred by measuring the connection length as a function of initial target location inside the plasma. Measuring the spatial distribution of the x-ray production will provide further information on the field topology, including the effects of magnetic field fluctuations and stochasticity.