In order to have better control of the orbit deviations of the beam in the booster, a mechanical system that allows a quadrupole to be moved transversely has been conceived and implemented. This mechanical system and the motorisation for the remote control of the translation was conceived so that it could be installed underneath a quadrupole magnet without dismounting the magnet and without stopping the vacuum system in the booster chamber. A total of three quadrupoles were equipped during the summer shutdown (see Figure 166) and their subsequent use has allowed a reduction of the rms orbit deviation by nearly 50%. It is planned to install motorisation systems on other quadrupoles in order to reduce the orbit distortions in the booster by about a factor of 5 overall.

Motorisation enabling a quadrupole in the booster to be displaced

Fig. 166: Motorisation enabling a quadrupole in the booster to be displaced.