Arrangement for scattering electrons
First Claim
1. An arrangement for scattering electrons in an electron accelerator with selectable acceleration energies, comprising:
- (a) acceleration means for providing a beam of electrons;
(b) first and second scattering foils arranged at a mutual spacing from one another along a direction of the beam for producing scattering properties;
(c) the first scattering foil in the beam direction having a constant thickness;
(d) the second scattering foil having a thickness decreasing from its center towards its margin;
(e) means for adapting the scattering properties to the selected acceleration energy including a set of scattering foils, each having a scattering property corresponding to a selected acceleration energy, the scattering properties of the set of foils decreasing with decreasing acceleration energy, a corresponding one of said set of foils being placed by said means into the beam path of said first scattering foil for a second acceleration energy; and
(f) said second scattering foil remaining unchanged in the beam.
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Accused Products
Abstract
An arrangement is provided for scattering electrons in an electron accelerator capable of variable acceleration energies. The arrangement has two scattering foils arranged at a mutual spacing from one another along a direction of an electron beam. A first scattering foil in the beam direction has a constant thickness whereas a second scattering foil has a thickness which decreases from its center towards its margin. The first scattering foil comprises a set of foils each of which have a scattering capability which corresponds to a selectable acceleration energy. The appropriate member of the set is selected and placed in the beam as the first scattering foil so as to create a relatively constant intensity of radiation over a given volume. The second scattering foil, which is of a more costly and complex construction, remains unchanged in the electron beam.
45 Citations
11 Claims
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1. An arrangement for scattering electrons in an electron accelerator with selectable acceleration energies, comprising:
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(a) acceleration means for providing a beam of electrons; (b) first and second scattering foils arranged at a mutual spacing from one another along a direction of the beam for producing scattering properties; (c) the first scattering foil in the beam direction having a constant thickness; (d) the second scattering foil having a thickness decreasing from its center towards its margin; (e) means for adapting the scattering properties to the selected acceleration energy including a set of scattering foils, each having a scattering property corresponding to a selected acceleration energy, the scattering properties of the set of foils decreasing with decreasing acceleration energy, a corresponding one of said set of foils being placed by said means into the beam path of said first scattering foil for a second acceleration energy; and (f) said second scattering foil remaining unchanged in the beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An arrangement for scattering electrons in an electron accelerator with selectable acceleration energies, comprising:
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(a) acceleration means for providing a beam of electrons; (b) first and second scattering foils arranged at a mutual spacing from one another along a direction of the beam for scattering the electron beam to produce a relatively constant intensity of the beam over a given volume; (c) the first scattering foil in the beam direction having a relatively constant thickness; (d) the second scattering foil in the beam direction having a variable thickness; (e) said first scattering foil comprising one of a set of foils, each foil in the set having a differing scattering property which corresponds to a selected acceleration energy, the scattering properties of the set decreasing with decreasing acceleration energy; and (f) means for selecting a corresponding one of said set of foils and placing it in the beam in accordance with a selected acceleration energy. - View Dependent Claims (11)
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Specification