Over the last few years, scientists at various muon facilities are developing the use of negative muons for muon induced X-ray elemental analysis benefiting from the availability of high-intensity muon beams. At PSI, the Muon Induced X-ray Emission (MIXE) technique has made remarkable progress. As a further step towards a more flexible use of MIXE, we are planning to construct a new permanent branch for MIXE at the μE1 beamline, that can be operated alternatively to the existing mE1 branch hosting the GPD spectrometer of the mSR facility. In this presentation, I will discuss our recent beamline design and beam transport calculation for MIXE. As a non-destructive elemental composition investigation technique, MIXE is depth-sensitive due to the physical characteristic of a muon Bragg peak in the sample, so a narrow momentum dispersion of the beam is needed to achieve an optimum depth resolution. It is important to change the muE1 layout with an impact as weak as possible on the existing GPD experiments. Subsequently, I will discuss how we ensure the credibility of calculations, and then show the characteristic of the design of the negative muon beam line. Our work suggests the new branch of muE1 as a promising route for meeting the requirements of MIXE, which sets the stage for a significant expansion of muon applications.
Thomas Prokscha