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The transition energy must be crossed in the CERN PS to accelerate proton andion beams to flat-top energy. A phase jump of the accelerating RF voltage withrespect to the phase of the bunches by about 180 degrees minus twice thesynchronous phase is required at the instant of transition. This phase offsetis injected into the beam phase loop which locks the phase of the vector sum ofthe RF voltage in the cavities to the beam. The polarities of the cavity returnsignal and of the stable phase programme are usually flipped at transition.However, both actions are difficult to perfectly synchronize in time, causingthe beam phase loop to partially lock out and relock at the new stable phase.The resulting glitch can be avoided by well-controlled phase jumps applied toboth, cavity drive and return signals simultaneously. This improvedimplementation of transition crossing makes it virtually transparent to thebeam phase loop. The new scheme has been successfully tested with proton andion beams, and it will become fully operational in the CERN PS after the longshutdown.

Compensated Phase Jump at Transition Crossing in the CERN PS