In the extracted proton beamline (EPB) in target station one, there is an intermediate target, used to produce pions. These then decay to muons, which are directed down the beamlines on either side of the EPB for experiments.

The intermediate target is a small plate of thin carbon. The muon target ladder consists of three water cooled targets. Only one target is in the proton beam at any given time, but if one fails then a new one can be quickly inserted. Unlike at some other facilities the muon target is static (i.e. not rotating) and is edge cooled.

The intermediate target assembly has a lifespan of 5-7 years, and the current unit is due for replacement. The design of the new assembly includes some changes, including an addition to the target holders to make them easier to handle with the remote handling arms.

During the build, it is crucial that the utmost care is taken to get everything right as, once the target is inserted into the extracted proton beamline, the unit will become too contaminated to rectify most faults.

In 2023, a cleanroom was set up in R106 for the intermediate target pre-build. Since then, the cooling system has been pressure-tested, and intricate wiring for the profile monitor installed. The mechanical build is now complete, and the motion system has been built and commissioned.

Now the target assembly is complete, it is ready for installation in the EPB, which will happen in early 2026.