Abstract
In this paper we investigate the production of a muon beam by positrons on target. We describe the characteristics of the muon beam as produced by different target configurations. We present an optics for the muon accumulator ring, discussing how it fulfils the large energy acceptance requirement and the high order chromaticity correction at the target, as well as other parameters relevant to enhance the muon bunch quality. We discuss the muon beam dynamics through the ring for the configuration of the single-pass LEMMA scheme, and the optimization study performed with the goals of maximizing the muon bunch population and minimizing its emittance.
Highlights
A novel approach has been recently proposed to produce low emittance muon beams using electron-positron collisions at a center-of-mass energy just above the μþμ− production threshold, corresponding to the direct annihilation of approximately 45 GeV positrons and atomic electrons in a target
We present an optics for the muon accumulator ring, discussing how it fulfils the large energy acceptance requirement and the high order chromaticity correction at the target, as well as other parameters relevant to enhance the muon bunch quality
Liquid lithium–diamond target In the previous section we have shown that using a liquid lithium film jet target yields an improvement in the quality of the accumulated muon beam, as it mitigates the effect of multiple scattering
Summary
A novel approach has been recently proposed to produce low emittance muon beams using electron-positron collisions at a center-of-mass energy just above the μþμ− production threshold, corresponding to the direct annihilation of approximately 45 GeV positrons and atomic electrons in a target. The cross section for continuum muon pair production peþffiffie− → μþμ− has a maximum value of aboupt ffi1ffi μb at s ∼ 0.230 GeV In our proposal these values of s can be obtained from fixed target interactions with a positron beam energy of about 45 GeV. We present here the design of the muon accumulator ring with the target insertion region, and the muon beam dynamics through this ring. In order to study the interplay of the different effects a simulation tool, MUFASA (MUon FAst Simulation Algorithm), has been developed It is a C++ based Monte Carlo code. A novel high momentum acceptance accumulator ring with a proper insertion region has been designed in order to deal with the energy spread at production and the low cross section. IV by summarizing the results from the particle tracking simulation studies and presenting an outlook on the future studies
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