Abstract
Beam-beam effects in eRHIC, the proposed energy recovery linac (ERL)-based electron-ion collider (EIC) at BNL, have several unique features distinguishing them from those in hadron and lepton colliders. Taking the advantage of the fact that the electron beam is used only once, we expect the luminosity to be 10 times that of a ring-ring collision scheme with similar parameters. However, without instituting proper treatments, the quality of electron and hadron beams can undergo degradation or even beam loss, driven by the beam-beam interactions. Kink instability is one of the most important collective effects of the ion ring due to the special beam-beam interaction in an ERL-based EIC. In this article, we present novel treatments for kink instability in ERL-based EICs including a scheme dedicated to suppressing instability.
Highlights
The main advantage of an energy recovery linac (ERL) based electron-ion collider (EIC) compared with a ringring collider is the higher achievable luminosity of the former [1]
The beam-beam parameter for the electrons in ERL scheme can exceed by a large margin that permissible for electron circulating in a ring
The range of beam-beam parameter for the electron beam is much larger than the achieved value in an lepton collider ($0:1), while the parameters for the ion/proton beam are limited to the proven value in RHIC operation
Summary
The main advantage of an energy recovery linac (ERL) based electron-ion collider (EIC) compared with a ringring collider is the higher achievable luminosity of the former [1]. In an ERL-based EIC, which we call a linac-ring scheme, the electron bunch collides only once with the ion bunch and thereafter is recycled. While the beam-beam parameter for the ions remains the same in both schemes, the luminosity achieved in the linac-ring collision scheme exceeds that of the ring-ring collider scheme by 1 to 2 orders of magnitude [1]. The range of beam-beam parameter for the electron beam is much larger than the achieved value in an lepton collider ($0:1), while the parameters for the ion/proton beam are limited to the proven value in RHIC operation. We detail a unique feedback scheme that acts only on the electron beam to suppress the emittance growth of the ion beam caused by this instability
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