Calculational analysis of structural activation induced by 20-100 MeV proton beam loss in high-power linear accelerators
Date
1994
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University
Abstract
For the new, high-power accelerators currently being designed, the amount of activation of the accelerator structure has become an important issue. To quantify this activation, a methodology was utilized that coupled transport and depletion codes to obtain dose rate estimates at several locations near the accelerator. To perform these calculations, simplified computer models were developed from detailed engineering drawings of a typical high-power accelerator design. This research focused on the 20 and 100 MeV sections of the Bridge-Coupled Drift Tube Linear Accelerator. The peak dose rate was found to be approximately 6 mR/hr in the 100 MeV section near the quadrupoles at a 25 cm radius for an assumed beam loss of 1 nA/m. This peak occurs after the longest irradiation time (one year) and the shortest subsequent decay time (ten seconds) considered for this research. It was determined that the activation was dominated by the proton interactions and subsequent spallation product generation, as opposed to the presence of the generated neutrons. The worst contributors were the spallation products created by proton bombardment of iron, and the worst component was the beam pipe, which consists mostly of iron. No definitive conclusions about the feasibility of hands-on maintenace can be determined, as the design is still not finalized.
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Includes bibliographical references.
Includes bibliographical references.
Keywords
nuclear engineering., Major nuclear engineering.