STI Publications - View Publication Form #10501
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Publication Information
| Title | Generation of gamma ray beams with tunable energy by annihilation of positrons in flight | ||||
| Abstract | Design concepts are presented for a system to produce beams of nearly monoenergetic gamma rays tunable in an energy range around 10 MeV. The gamma rays are produced in the forward direction by annihilation in flight of nearly monoenergetic positrons. The positrons are produced by an electron beam impinging on a target subsystem optimized for positron production within the acceptance of the downstream subsystems. The target is followed by an innovative ?dipole plus wedge? monochromator, in which the positrons are bent 180° in a uniform magnetic field to disperse their momenta, after which a wedge absorber selectively reduces their momentum spread to a narrow range. Those positrons then impinge on a low-Z converter plate in which some of them annihilate with atomic electrons in the converter to produce the desired gamma ray beam. Simulations using G4Beamline (which in turn uses Geant4) have been performed to verify the concepts and to evaluate the system performance. | ||||
| Author(s) | R. Abrams, Andrei Afanasev, Charles Ankenbrandt, Kevin Beard, Alex Bogacz, L. Campbell, James Fast, G. Flanagan, Rolland Johnson, D. Neuffer, M. Popovic, C. Yoshikawa | ||||
| Publication Date | December 2012 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Accelerator Ops, R&D / Cntr-Adv Studies of Acce / Ctr for Adv Stud of Accel | ||||
| Funding Source | |||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Preprint |
| Refereed | No |
| Volume | |
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Attachments/Datasets/DOI Link
| Document(s) |
JLAB-ACP-11-1356.pdf
(STI Document)
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| Dataset(s) | (none) |
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