Dose estimates when electrons strike a copper absorber during injection at the Canadian Light Source

• Published in: Radiation measurements Vol. 51-52; pp. 92 - 98
• Main Authors: Asai, J., Hirayama, H.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.04.2013; Elsevier
• Subjects: Beams (radiation); CONCRETE; Copper; Devices; Dose estimate; Earth sciences; Earth, ocean, space; ELECTRONIC PRODUCTS; ELECTRONS; Estimates; Exact sciences and technology; Geochronology; Injection efficiency; Isotope geochemistry. Geochronology; Light sources; Loss of electrons; MATHEMATICAL ANALYSIS; Mathematical models; Shielding walls; Stainless steel beam pipe; Strikes; Tapered copper absorber; Walls; Wiggler vessel; Dose estimate; Stainless steel beam pipe; Loss of electrons; Shielding walls; Injection efficiency; Tapered copper absorber; Wiggler vessel; models; efficiency; strike; storage; electrons; pipes(igneous rocks); shields; copper; injection; energy
• ISSN: 1350-4487; 1879-0925
• DOI: 10.1016/j.radmeas.2013.02.010

Dose estimates are undertaken when injected electrons strike a tapered copper absorber of the insertion device beamline during injection at the Canadian Light Source (CLS). A model consisting of a tapered copper absorber, a wiggler vessel, a stainless steel beam pipe and a concrete ratchet and side wall is constructed. The doses immediately behind the ratchet wall are estimated by calculating the energy depositions in a water phantom that encloses the entire structure. Also estimated are the doses along the side wall and near the inner edge of the ratchet wall. The accumulated doses are calculated assuming various injection efficiencies to the storage ring and the number of electrons lost at the tapered copper absorber during injection. From these values, the dose rates are obtained with or without a local shield. ► Electrons striking the absorber are considered responsible for high radiation. ► A model is constructed to estimate the dose when the absorber is hit by electrons. ► The dose rates are obtained assuming the number of electrons lost at the absorber. ► Dose rates are also examined for various injection efficiencies.