Modeling of Non-Gaussian Beamlet Profile Based on Total-Beam Power Loss and Transmission
Fusion Science and Technology / Volume 8 / Number 1P2B / July 1985 / Pages 1717-1721
Plasma Heating, Impurity Control, and Fueling / Proceedings of the Sixth Topical Meeting on the Technology of Fusion Energy (San Francisco, California, March 3-7, 1985) / dx.doi.org/10.13182/FST85-A40008
Articles are hosted by Taylor and Francis Online.
The angular intensity profile of a single beamlet is expressed as a sum of a main Gaussian and a bump-on-the-tail representing the optical aberration. Transmission of a total beam comprised of a large number of beamlets is then analytically derived. By an iterative matching of the calculated transmissions to the measured transmissions through at least two downstream openings, the parameters that describe the single beamlet angular profile are determined. Some of the neutral beam injectors employed for heating fusion plasmas are characterized by this modeling. Also presented is an improved algorithm for calculating the intensity distribution at a downstream plane.
