At the S-DALINAC, Norbert Pietralla's team has succeeded for the first time in demonstrating the reuse of previously used energy in a two-fold energy recovery mode: Electrons were sent twice through the main accelerator for double acceleration by using recirculation beamlines. Following the double acceleration, a phase shift was implemented, so that the electrons were decelerated again during the following two main accelerator passes. The recovery of energy during deceleration allows higher beam currents and thus higher beam powers to be achieved. This development enables future large-scale projects, such as LHeC at CERN, which would not be technically and economically feasible without the energy recovery technology.

Further details on the realization and the results achieved can be found in the publication in Nature Physics.

Also read the comment 'A route to greener Big Science' by Peter Williams on this publication in Nature Physics and the article 'A multi-turn energy recovery accelerator that achieves high beam power with lower power consumption' by Ingrid Fadelli at Phys.org.