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26 April 2024 |
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Observations of 2D Doppler backscattering on MAST | | D. A. Thomas
; K. J. Brunner
; S. J. Freethy
; B. K. Huang
; V. F. Shevchenko
; R. G. L. Vann
; | | Date: |
23 Jul 2015 | | Abstract: | The Synthetic Aperture Microwave Imaging (SAMI) diagnostic has conducted
proof-of-principle 2D Doppler backscattering (DBS) experiments on MAST. SAMI
actively probes the plasma edge using a wide (+-40 degrees vertical and
horizontal) and tuneable (10-35.5 GHz) beam. The Doppler backscattered signal
is digitised in vector form using an array of eight Vivaldi PCB antennas. This
allows the receiving array to be focused in any direction within the field of
view simultaneously to an angular range of 6-24 degrees FWHM at 10-34.5 GHz.
This capability is unique to SAMI and is an entirely novel way of conducting
DBS experiments. In this paper the feasibility of conducting 2D DBS experiments
is explored. Initial measurements of phenomena observed on conventional DBS
experiments are presented; such as momentum injection from neutral beams and an
abrupt change in power and turbulence velocity coinciding with the onset of
H-mode. In addition, being able to carry out 2D DBS imaging allows a
measurement of magnetic pitch angle to be made; preliminary results are
presented. Capabilities gained through steering a beam using a phased array and
the limitations of this technique are discussed. | | Source: | arXiv, 1507.6555 | | Services: | Forum | Review | PDF | Favorites | |
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