Feasibility of Electron Cooling for Low-Energy RHIC Operation

Feasibility of Electron Cooling for Low-Energy RHIC Operation

“…This would allow us to reduce the beam size at the interaction points and provide larger luminosity. We can summarize [6] that electron cooling would offer long stores for physics and a 3-fold increase in average luminosity for low-energy points (~2.7-5). For higher energies (y > 5), it would provide for about a 6-fold increase in average luminosity.…”

“…For higher energies (y > 5), it would provide for about a 6-fold increase in average luminosity. Note that if hard spacecharge limit is not reached, electron cooling can provide additional factors in luminosity improvement on top of the factor 3-6 quoted above [6].…”

“…electron cooling. Electron cooling of RHIC ion beams will increase the average integrated luminosity, and will provide longer stores for physics [7]. If a critical point signature is found, a larger statistical sample (on the order of 50M events) will be requested to characterize it.…”

“…The main problem for bunched electron beam is transport of electron bunches without significant degradation of the electron beam emittance and energy spread. Two approaches to an RF-gun-based cooler have been considered and found promising [6].…”

Projections of potential luminosity improvement for low-energy RHIC operation with electron cooling

“…Electron cooling was proposed to increase luminosity of the RHIC collider for heavy ion beams at low energies [1][2]. Luminosity decreases as the square of bunch intensity due to the beam loss from the RF bucket as a result of the longitudinal intra beam scattering (IBS), as well as due to the transverse emittance growth because of the transverse IBS.…”