While operating at a lower-than-normal beam energy of 100 MeV, the Operators raised a bending magnet supply current to its maximum value. The combination of lower-than-normal beam energy and maximum bending magnet field strength allowed the beam to pass through the beam pipe, miss the supplemental (shadow) shielding, and impinge upon and through the Linac/Booster shield wall. This created elevated localized radiation levels (maximum of 350 mR/hr) in the Booster Ring, which was occupied, and caused several radiation monitors to alarm locally. No one was injured or exposed to radiation.
Lessons Learned: Unclear operating organizational roles and responsibilities and failure to implement a performance-based approach to determining readiness contributed to an electron beam miss-steering event.
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