Design study for an energy-efficient MeV-ranged photon-beam facility

The efficient use of energy resources for scientific research is a challenging and timely topic, in particular for scientific fields that require particle accelerator facilities, such as particle or nuclear physics. Accelerator facilities capable of providing high electron beam currents with minimum emittance to ultra-relativistic energies are needed for the production of intense, MeV-ranged, quasi-monochromatic photon beams for photonuclear research and nuclear photonics applications. This contribution presents a design for such an electron accelerator which is capable of recycling most of the kinetic energy of the ultra-relativistic electrons by beam deceleration after a quasi destruction-free usage, thereby lowering significantly the electrical power consumption footprint of operating the accelerator without compromising beam delivery performance. We provide for the first time a technically quantitative design for a thrice-recirculating, superconducting energy-recovery LINAC (ERL) with individual beam transport focusing primarily on its use as a driver for a source of MeV-ranged photons from a laser-Compton backscattering (LCB) scheme. As a specific example, we choose an ERL design for maximum electron energy of 520 MeV at an electron current of up to 26 mA in continous wave mode at 1.3 GHz. This allows for 0.79 mA average current in a pulsed mode at 39.4 MHz, providing unprecedented spectral densities on the order of 10⁵γ/(eV s) on target for photon energies around 5 MeV with the aforementioned repetition rate. Our Design concept of an Individually recirculating Compact ERL (DICE) is discussed. Options for its scientific use are sketched.

Duke Scholars

Author Calvin R. Howell Physics

Author Ying Wu Physics