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Stability evaluation for long FB loop delay in the ACS cavity field control for the J-PARC linac 400-MeV upgrade

Kobayashi, Tetsuya

For 400-MeV upgrade of the J-PARC linac. ACS (Annular Coupled Structure) cavities, which are driven by 972-MHz RF, will be installed. The ACS cavity has complicated structure. Its Q-value is very low and the operation frequency is three times high in comparison with that of the SDTL cavity. So the stabilizing control of the ACS accelerating field will be more difficult than present RF system. Further more the chopped beam loading compensation is required. Especially, a debuncher, which has ACS structure, will be located very far from the klystron, consequently the feedback loop delay will be about 1.5 $$mu$$s. This paper will show the simulation results of the feedback control of the ACS cavity field including long loop delay. As the result, it was found that the required stability could be satisfied by giving high integral gain in FB control.

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