Investigation of a coherent instability with an ion beam probe
Abstract
considerably improved. A complete 1 MHz data handling system using buffer storage has been developed for use with the Tokamak facility. In addition a beam trajectory programmer has been developed for controlling the position of the probing beam in the plasma, and the frequency response of the analyzer/detector systems has been improved. The concept of using a beam probe for mapping general magnetic fields has also been further developed. The technique has been placed on firmer theoretical grounds, and numerical simulations have been performed to return a known poloidal field from what we believe to be measureable parameters. The Rensselaer Tokamak, which will be the focus of our on-campus program in the immediate future, has been constructed and installed. The diagnostic equipment for use with the Tokamak is progressing and measurements will begin shortly. Finally, preliminary designs of ion beam probe systems have been performed for several existing or planned confinement devices, including the ELMO Bumpy Torus, the PDX Tokamak, and the Tokamak Fusion Test Reactor.
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