Slip stacking experiments at Fermilab Main Injector

In order to achieve an increase in proton intensity, Fermilab Main Injector will use a stacking process called "slip stacking". The intensity will be doubled by injecting one train of bunches at a slightly lower energy, another at a slightly higher energy, then bringing them together for the final capture. Beam studies have started for this process and we have already verified that, at least for a low beam intensity, the stacking procedure works as expected. For high intensity operation, development work of the feedback and feedforward systems is under way.