Speaker
Description
In high current pulsed beam accelerators such as the J-PARC linac, beam loading compensation is essential for maintaining uniform accelerating fields in the presence of beam loading and reducing momentum variation within a pulse. In practice, fluctuations in high power RF components and beam conditions cause the optimal compensation parameters to vary continuously. To address this issue, we developed an adaptive beam loading compensation system that models the RF system using transfer functions derived from measured time domain responses and calculates optimal parameters in the frequency domain. The accelerating field converges to its optimal value within about two to three iterations without error accumulation or divergence. This enables stable field control under typical operating conditions. Furthermore, the system has been further improved and is operated to maintain field stability even under thinned intermediate-pulse operation. These results demonstrate the applicability of the transfer function measured in the RF system of accelerators.
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