voltages up to 450 kV are required. [1,2]. In parallel with the studies on MA cavities conventional ferriteloaded cavities are studied as an alternative for the needed accelerating system. 2. Q-Loss Effect Limitations In ferrite-tuned cavities, the maximum accelerating voltage is most often strongly restricted by the Q-Loss-effect (QLE) [3, et al.] as illustrated in Fig.1. When a square pulse of rf power with constant frequency is applied to the ferrite cavities, above a certain level, the rf voltage follows the pulse shape only for about 5-10 ms and then drops to a lower level. In GSI the lowest Q-loss threshold (QLT) is about 16 kV in the SIS18 and 5 kV in the ESR cavities. Fig.1: Example of the Q-Loss-Effect in the ESR cavit
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