Speaker
Description
In early 2025, Linac modulator 3 at the Taiwan Photon Source (TPS) exhibited signs of performance degradation. To reduce electrical stress and prevent an unplanned failure during user operations, BR injection feasibility was evaluated at 130 MeV, 140 MeV, and the nominal 150 MeV. Two compounding mechanisms limit low-energy injection efficiency: increased geometric emittance from the Linac, and degraded BR power supply waveform reproducibility at the earlier injection point on the ramp, which reduces the dynamic aperture. At 130 MeV, the mean BR current of 0.168 mA cannot satisfy the 5-second top-up window. At 140 MeV, a mean of 0.342 mA meets the >0.3 mA operational criterion, and this 140 MeV rescue mode maintained uninterrupted user service throughout the modulator degradation period.
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