Target Bypass Beam Optics for Future High Intensity Fixed Target Experiments in the CERN North Area

Several of the proposed experiments for operation at the K12 beam line would profit from significant beam inten- sity increase. Among those, there is the KLEVER exper- iment that would require an intensity of 2 × 1013 protons per 4.8 s long spill. The main goal of the experiment is to measure 𝐵𝑅(𝐾𝐿 → 𝜋0𝜈𝜈) to test the Standard Model structure, by itself, and in combination with results from NA62 for 𝐵𝑅(𝐾+ → 𝜋+𝜈𝜈). NA62 could also profit from higher intensities, and could be run in a new configuration called NA62-HI(gher intensity). In the current configuration the beam is transported from the SPS to the TT24 beam- line. This beamline leads to the T4 target that attenuates the beam for P42. After T4 the beam is directed into the P42 beamline before impinging on the T10 target and creating the particles necessary for the experiment. Those are finally transported to the detector via K12. This paper presents the idea of partially bypassing T4 and changing the P42 beamline configuration in order to have a sufficiently small beam size at the T10 target for both KLEVER and NA62-HI. Optics studies are developed in MADX and the AppLE.py, software developed at CERN.