Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1886406 | Radiation Physics and Chemistry | 2012 | 16 Pages |
Abstract
The yield of bremsstrahlung from collisions of fast electrons (energy at least 6Â MeV) with a Tungsten target can be significantly improved by exploitation of Tungsten wall scatter in a multi-layered target. The Tungsten wall can serve to refocuse small angle scattered electrons. It is necessary that the thickness of one Tungsten layer does not exceed 0.02Â mm. Further repeated focusing of electrons results from suitable magnetic fields with field strength between 0.5Â T and 6Â T (if the cone with multi-layered targets is rather narrow). Linear accelerators in radiation therapy only need repeated focusing by wall scatter without further magnetic fields (standard case: ca. 100-000 plates with 0.01Â mm thickness and 1Â mm distance between the plates). The construction of a very narrow bremsstrahlung beam with extremely high photon intensity requires an additional strong magnetic field (order 1-6Â T), which provides the possibility to check Heisenberg-Euler scatter of high energy photons.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
W. Ulmer,