1959

First MPS: BBC (6kA/5.4kV)

1968

Second MPS: SIEMENS (6kA/10.8kV)

Power Part simplified Architecture / Topology

2010 POPS / POwer for PS

POPS supplies the PS magnets without drawing all the power from the network. The maximum stored energy in the magnets is 14MJ. This energy is supplied by the capacitor banks (CS). 

This exchange of energy between the capacitor banks and the load is controlled by DC/DC converters. The system is connected to the electrical network by two AC/DC converters (Active Front End). These converters charges the capacitor banks and supplies the losses of the load and of the converters.

POPS Power Converter Achitecture

The POPS power converter is composed of two identical AC/DC (AFE) units which supply power to six DC/DC power converters (4 floating and 2 charges). The DC/DC converters are designated as "Floatings" if the relative capacitor bank is floating otherwise "Chargers" when an AFE is present. The capacitor banks are used to exchange the energy with the PS magnets during converter pulsing operation.

POPS Power Part simplified Architecture / Topology

As the current in the magnets rises, the voltage across storage capacitors drops. The energy stored in the magnets is then given back to capacitors at the end of the cycle. In this way the AFE converters provides only the losses required by the magnets and the converter itself. 

POPS capacitors discharge and AFE power during cycles

POPS installation

Converter room

IGBT Stacks

New capacitor containers installed in 2020

Capacitor bank

Reporting from Yves Gaillard