Speakers
Description
Four beam lines are currently in operation at the RFT-30 cyclotron. As the demand for various radioisotopes continues to grow, we focused on proton irradiation stability to improve the production yield. The beam behavior along the transport line was investigated so that the irradiation area could be matched to the geometry of the target. For this purpose, the beam trajectory was first aligned with a steering magnet, and the size of the irradiated spot was then tuned through a triplet quadrupole. A sine-wave driven wobbler magnet was subsequently introduced to sweep the beam along a circular waveform, thereby flattening the beam profile across the target surface. The resulting proton distribution was recorded on a Gafchromic film under a low-current beam, and an irradiation area was achieved at an optimal wobbler current.
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