MOCOZBS01
JLab, Newport News, Virginia, USA
SLAC, Menlo Park, California, USA
BNL, Upton, New York, USA
Future electron-ion colliders collide high-intensity ion beams with high current electron beams. The electron beams take advantage of synchrotron radiation to damp emittances but the ion beams must be cooled via a beam cooling mechanism, including electron cooling. The ion energies are typically a few hundreds of GeV per nucleon, for an electron-ion collider envisioned to be built in US. At this energy, DC coolers powered by electrostatic accelerators, are not useful. The ERL, in principle, can provide the high current and brightness to cool these high-brightness ion beams. The beam quality requirements are much different from previous ERLs designs used for FELs. The cooling bunch must be much longer than in an FEL and the relative energy spread must be very small. Incoherent cooling can be enhanced with magnetized beams, but the magnetization must be maintained throughout the ERL. An alternate cooling mechanism, the so-called Coherent Electron Cooling, is, in principle, stronger and can be done with non-magnetized beams. We will present several applications of ERLs to high energy electron cooling and describe the technical challenges that must be overcome to build such an ERL.
TUCOWBS01
JLab, Newport News, Virginia, USA
Douglas Consulting, York, Virginia, USA
HZDR, Dresden, Germany
Both the dynamics and the architecture of an energy recovery linac are primarily determined by the longitudinal match. This match can be manipulated by both the magnetic lattice and the RF systems. Here we will present a few examples of systems and the longitudinal solutions found for each. The first application is a free-electron laser application where a short bunch and high peak current are required. The laser increases the energy spread and lowers the energy and this must be compensated in the ERL design. The second application is for an internal target experiment where the need was for small energy spread rather than a short bunch. The third example is for an electron cooler where the bunch must be very long with extremely small energy spread. The beam disruption due to cooling is small but CSR and microbunching effects are a real challenge. In the FEL, the longitudinal matching is mainly accomplished via lattice matching while in the cooler application the RF system is the dominant method to control the phase space. The internal target can be addressed either way.