A Green's function method for heavy ion beam transport |
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Authors: | J. L. Shinn J. W. Wilson W. Schimmerling M. R. Shavers J. Miller E. V. Benton A. L. Frank F. F. Badavi |
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Affiliation: | (1) NASA Langley Research Center, 23681-0001 Hampton, VA, USA;(2) Lawrence Berkeley Laboratory, 94720 Berkeley, CA, USA;(3) University of San Francisco, 94117 San Francisco, CA, USA;(4) Newport News, Christopher Newport University, 23601, VA, USA |
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Abstract: | Abtract The use of Green's function has played a fundamental role in transport calculations for high-charge high-energy (HZE) ions. Two recent developments have greatly advanced the practical aspects of implementation of these methods. The first was the formulation of a closedform solution as a multiple fragmentation perturbation series. The second was the effective summation of the closedform solution through nonperturbative techniques. The nonperturbative methods have been recently extended to an inhomogeneous, two-layer transport media to simulate the lead scattering foil present in the Lawrence Berkeley Laboratories (LBL) biomedical beam line used for cancer therapy. Such inhomogeneous codes are necessary for astronaut shielding in space. The transport codes utilize the Langley Research Center atomic and nuclear database. Transport code and database evaluation are performed by comparison with experiments performed at the LBL Bevalac facility using 670A MeV20Ne and 600A MeV56Fe ion beams. The comparison with a time-of-flight and E detector measurement for the20Ne beam and the plastic nuclear track detectors for56Fe show agreement up to 35%–40% in water and aluminium targets, respectively.Submitted paper presented at the International Symposium on Heavy Ion Research: Space, Radiation Protection and Therapy, Sophia-Antipolis, France 21–24 March 1994 |
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