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DE200515013335

Publication Date	2002
Personal Author	McLean, H. S.; Hill, D. N.; Rutov, D. D.; Chen, H.
Page Count	22
Abstract	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.
Keywords	Plasmas Measurement testing Magnetically confined plasmas Magnetic field topology Laser-based diagnostics Spheromaks FLIRT (Field Line TRacing)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200524

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

Laser-Based Diagnostic for Tracing Magnetic Field Lines in Spheromaks and Other Self-Organized Magnetically Confined Plasmas.
DE200515013335

Publication Date	2002
Personal Author	McLean, H. S.; Hill, D. N.; Rutov, D. D.; Chen, H.
Page Count	22
Abstract	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.
Keywords	Plasmas Measurement testing Magnetically confined plasmas Magnetic field topology Laser-based diagnostics Spheromaks FLIRT (Field Line TRacing)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200524