Chapter 4: Beamline – main components

Abstract

The East Area renovation will cover the refurbishment of the East Hall with its beamlines and infrastructures. A re-design of the beamlines is included to improve the magnet situation, the radiation situation, and maintainability in general. Thanks to a cycled powering mode of the magnets instead of a steady state one, considerable energy savings will be possible. Therefore, several magnet families have to be re-designed to be in accordance with the purposes of the project.

The new East Area magnet system consists of 12 different designs with a total of 58 magnets among which 15 are bending magnets, 31 are quadrupoles, and 12 are correctors. In the Proton Synchrotron (PS) area (Building 352), the primary area (Building 157), and the line T08 (Building 157), the magnets will be cycled every 2.4 s. This concerns the lines F61, F62, part of F63, and T08. The other lines, T09, T10, and T11, will be cycled with a period of 4.8 s. Cycling the magnets is an important constraint for the construction of the magnetic parts (yokes). In addition, the coils have to be adapted to match the power supply specifications. The magnets have to be laminated to avoid eddy currents and large delays between the magnetic field and the current application. All laminated magnets currently used and needed in the new in the East Area layout will be refurbished, this concerns four families (or 22 units). The new magnets will be manufactured by industry according to CERN’s design.

Another constraint is the magnet overall size limitations. As the layout was fixed at the beginning of the project, all new large magnet designs had to have the same length and width as the present ones. This complicates the designs, as laminated yokes need a larger mechanical structure around the yoke to maintain the laminations. The total lengths and widths have been discussed with the integration team and after few iterations a solution was found and the final designs approved.