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Description
Based on the beam commissioning of CSNS-I RCS, the current tune above half-integer exhibits extremely small parameter margins and severe instabilities. Therefore, to further increase beam power in Phase II, significant optimization of the tune is required.Through extensive simulations, we identified that the tunes below half-integer (near 4.3/5.3) show no instabilities, which is crucial for power enhancement in Phase II. To verify stable operation at the tunes of this region in the actual machine, we conducted a series of machine studies. The results demonstrate that the tunes below half-integer is instability-free and can achieve stable beam supply at 140 kW (corresponding to 700 kW in Phase II under equivalent tune shift due to space charge).
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