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Comparison between OPERA models without and with the drilled hole necessary for the laser beam access (no hole—symbols/with hole—solid lines) for three different values of the current I (A), needed to have masses A/q = 1, 100, and 300 in the central trajectory, respectively (Left). Relative integrated field error [10−4] for I = 70.3 which corresponds to A = 300 amu at 30 keV for a magnet with the laser window incorporated (Right).
