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Description
A beam-dynamics matching design is developed for the 11.07 m injection line of a 150 MeV separated-sector cyclotron using an Opera-3D and OPAL workflow. The adopted scheme combines two 50.85 MHz bunchers upstream of an opposite-bend vertical Z-dogleg, a con-ventional upstream matching channel, and independently powered inter-bend triplets. At the design beam current of 7.77 mA, two otherwise identical full-bunch OPAL simulations including space charge are compared to evaluate the effect of the bunchers. With both bunchers switched off, the output rms bunch length is 76.27 mm and the rms momentum spread is 0.718%. Operating F1 and F2 reduces these values to 24.83 mm and 0.194%, respectively. The corresponding rms output spot changes from 7.438 × 12.810 mm to 9.514 × 5.803 mm, indicat-ing a transverse redistribution accompanying the longi-tudinal compression, while the transmission efficiency remains 99.99%. These results demonstrate that buncher-induced longitudinal matching must be evaluated togeth-er with space-charge effects and transverse envelope matching at the design current.
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