Evaluation of Possible Nuclear Magnetic Resonance Diagnostic Techniques for Tokamak Experiments
Authors: S.J. Zweben, T.W. Kornack, D. Majeski, G. Schilling, C.H. Skinner, R. Wilson, and N. Kuzma
Date of PPPL Report: August 2002
Presented at: the 14th Topical Conference on High Temperature Diagnostics, Madison, Wisconsin, July 8-11, 2002. Proceedings to be published by the Review of Scientific Instruments.
Potential applications of nuclear magnetic resonance (NMR) diagnostic techniques to tokamak experiments are evaluated. NMR frequencies for hydrogen isotopes and low-Z nuclei in such experiments are in the frequency range of approximately equal to 20-200 MHz, so existing RF antennas could be used to rotate the spin polarization and to make the NMR measurements. Our tentative conclusion is that such measurements are possible if highly spin polarized H or 3He gas sources (which exist) are used to fuel these plasmas. In addition, NMR measurements of the surface layers of the first wall (without plasma) may also be possible, e.g. to evaluate the inventory of tritium inside the vessel.