Development of a low-energy, high-brightness $μ^+$ beam line

We are developing a beam line which compresses the phase space of a standard surface $μ^+$ beam by 10 orders of magnitude with an efficiency of $10^{-3}$. Phase space compression occurs in a He gas target and consists of three consecutive stages: Transverse (perpendicular to the beam axis) compression, longitudinal compression and re-extraction into vacuum. Transverse compression was observed for the first time and longitudinal compression has been measured to occur within 2.5 $μ$s with high efficiency.

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