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Prior to establishing operation of the world's first mulit-turnsuperconducting Energy Recovery Linac, (ERL) the Cornell-BNL Energy RecoveryTest Accelerator (CBETA) was configured for one turn energy recovery. In thissetup, direct measurement of the beam loading in each of the main linaccavities demonstrated high energy recovery efficiency. Specifically, a totalone-turn power balance efficiency of 99.4%, with per cavity power balancesranging from 99.2-99.8%, was measured. When accounting for small particlelosses occurring in the path length adjustment sections of the return loop,this corresponds to per cavity single particle energy recovery efficienciesranging from 99.8 to 100.5%. A maximum current of 70 microamps was energyrecovered, limited by radiation shielding of the beam stop in its preliminaryinstallation.

Measurement of the Per Cavity Energy Recovery Efficiency in the Single Turn CBETA Configuration