Technical Design Report Super Fragment Separator

External
Control System
Data transfer
using
High Level Protocol
DRAFT
Figure 2.4.75: Communication to external control system.
The controller for the load quantities can be realized by analogue electronics or by digital control
algorithms. Where ever possible digital control is preferred. Excellent results have been achieved
with digital control algorithms based on analogue control strategies enhanced by the possibilities of
digital signal processing.
The link to the external control system as well as the power converter control have been decided to
have the same design and the same technical realisation in all power converters of FAIR. That
applies to the load current measuring devices too, the DCCTs.
2.4.3.2 Dipole Power Converters
The power converter is a 12 pulse SCR with parallel active filter and must be able to return the
stored magnet energy (0.9 MJ) to the power converter. A basic circuit diagram is given in Figure
2.4.71.
2.4.3.3 Quadrupole Power Converters
The quadrupole magnets are normal or superferric conducting magnets. 4-quadrant converters will
be used to allow for bipolar currents which are required for different ion-optical modes of the
Super-FRS depending on the specific experimental condition. Part of the magnet energy has to be
dumped in a brake chopper parallel to the capacitor of the DC-link.
2.4.3.4 Multipole Power Converters
Link to
External
Control System
Data Translation
Real time data transfer
Low Level Protocol
The hexapole magnets are normal or superferric conducting. The power supplies are equipped with
4-quadrant switching circuits. The capacitor of the DC-link can absorb the small amount of magnet
energy.
using
Power Converter
75