Speaker
Description
A comprehensive assessment of the ionizing dose absorbed by the normal-conducting magnets in the Electron Storage Ring (ESR) was performed to evaluate their survival over the EIC lifetime. FLUKA simulations using detailed CAD-based geometry imported through unstructured meshes, together with realistic beam optics, were carried out for 10 and 18 GeV electron operation. The results show that dose levels are negligible at 10 GeV, but a critical issue emerges at 18 GeV due to the substantially higher synchrotron-radiation critical energy. At this energy, a non-negligible fraction of the emitted power penetrates the copper beam pipe, producing lifetime-integrated doses of several hundred MGy in regions of direct impact. Such levels would exceed the degradation limits of the G10 coil insulation—typically a few tens of MGy—within the first year of 18 GeV operation and would jeopardize the long-term integrity of the magnets. Preliminary studies indicate that an appropriate high-Z shielding solution can reduce the dose to acceptable levels, and a dedicated shielding-design campaign is now underway to ensure magnet survivability throughout EIC operation.
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