SM2 / Spectrometer |
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SM2 | |
RPABT.BA82.RSM2.COMPASS | CERN |
Power In | 3 ~ 18kV/2x2560kVA |
Power Out | 4800A/540V |
Converter Type | Thyristors 12P |
Control type | FGC3 / CESAR |
1st Intervention | ![]() |
Responsibles: | Yves GAILLARD |
Xavier GENILLON |
SM2 magnet is located on M2 beam line inside PPE221 zone.
It is supplied by the RPABT.BA82.RSM2.COMPASS power converter.
SM2 power converter architecture
The SM2 power converter consists of two 6-pulse rectifier modules, connected in parallel. The bridges are fed from the 18 kV network through two cast resin power transformers phase-shifted 30°. A mechanical polarity-reversal switch is present after the passive filter.
Power Part simplified Architecture / Topology .pdf
SM2 control synoptique
High precision current control loop is managed by the digital controller called FGC3 (Function Generator Controller 3). This unit includes a high precision Sigma Delta Analog to Digital Converter which digitalize the analog current measurement coming from 2 DCCTs (DC current Transducer). Precision is then directly relying on sensor precision: DCCT, the ADCs, and the algorithm being used for the regulation loop.
The SK101 cable brings back all the interlocks magnet of the spectrometer. There are 6 interlocks (Water Pressure, Water Temp, Coil Temp, Eletta, Red Button, Terminal Box) which are grouped in two interlocks for the regFGC3 electronics.
SM2 Magnet connection simplified schematic
Resistance: 0.115 Ohm |
Inductance: 1H |
Maximum field at 6 kA: 1800T |
Max. excitation current:5000A |
Water Flow: 150l/mn |
Weight:400t |
Year:1975 |
SM2 power converter is installed in North area: