After the completion of the antiproton programme, the Low-Energy Antiproton Ring (LEAR) will be able to serve as an accumulator ring for heavy ions in the injector chain of the Large Hadron Collider (LHC). For injection and accumulation, a scheme is proposed, which exploits both the longitudinal and the transverse acceptances of LEAR. Compared to a classical multiturn injection, a factor 3 to 5 in intensity is gained for the set of parameters pertaining to this case; furthermore emittances, which are more favorable for electron cooling, result. The principle is outlined and computer simulations are presented.
With the intense electron beams used for cooling, matching of the ion and electron velocity over the la rgest possible fraction of the beam profile becomes important. In this situation, a finite dispersion from the ring in the cooling section can lea d to an appreciable gain in the transverse cooling speed. Based on a simple model of the cooling force, an expression for the "optimum" dispersion as a function of the electron beam intensity, the momentum sprea d and other properties of the ion beam will be derived. This simple theory will be compared to mea surements made on the Low Energy Ion Ring (LEIR) at CERN during 1997 . With the intense electron beams used for cooling, matching of the ion and electron velocity over the largest possible fraction of the beam profile becomes important. In this situation, a finite dispersion from the ring in the cooling section can lead to an appreciable gain in the transverse cooling speed. Based on a simple model of the cooling force, an expression for the "optimum" dispersion as a function of the electron beam intensity, the momentum spread and other properties of the ion beam will be derived. This simple theory will be compared to measurements made on the Low Energy Ion Ring (LEIR) at CERN during 1997.
CERN/PS 99-045
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