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topPower Converter Characteristics

POPSB Converter Room
RPOPB GENERAL ELECTRIC
Power In 3 ~ 18KV/1950V 2.5MVA
Power Out 5.6KA/3050V
Converter Type Capacitive Storage
Control type General electric Control + FGC3

topOperation Responsibles

1st Intervention Piquet Injector icon Piquet SY-EPC Injector(160391)
Responsibles: Fulvio BOATTINI Fulvio BOATTINI
Arnaud BESSONNAT Arnaud BESSONNAT
Yves GAILLARD Yves GAILLARD

topPower Converter Architecture

POPSB supplies the PSB magnets without drawing all the power from the network. A storage capacitor bank connected on the DC side provide power decoupling from the network. The storage capacitance is around 0.3F (@5kV Udc nominal)

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

Dipole and quadrupole magnets of the PSB accelerator are grouped in two independent series (“Magnet string 1&4” and “Magnet string 2&3” in Figure 2) each one powered by one POPSB.MPS power converter.

In total there are three POPSB.MPS power converters:

  • POPSB.MPS.A: powers all 1&4 apertures of bending magnets and all 4 apertures of quadrupole focusing magnets;
  • POPSB.MPS.B : powers all 2&3 apertures of bending magnets and all 4 apertures of quadrupole de-focusing magnets;
  • POPSB.MPS.C: can be used to replace either POPSB.MPS.A or POPSB.MPS.B.
  • The three POPSB.MPS power converters are identical.

    POPSB converter architecture

    POPSB.MPS converter architecture

    topPower Part

    Power In 3 ~ 18KV/1950V 2.5MVA
    Power Out 6KA peak,3KA rms/3KV
    Cooling type Demineralized water

    The POPSB.MPS power converter is composed of an AC/DC (AFE) units which supply power to a DC/DC power converter. The capacitor banks are used to exchange the energy with the PSB magnets during converter pulsing operation.

    POPSB power converter schematic diagram

    POPSB power converter schematic diagram

    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 converter provides only the losses required by the magnets and the converter itself.

    POPSB Magnet current & voltage

    POPSB Magnet current & voltage

    POPSB Power balance

    POPSB Power balance

    topControl & Regulation Part

    POPSB power converter schematic block diagram

    POPSB power converter schematic block diagram

    POPSB control functional diagram

    POPSB control functional diagram

    POPSB control scheme

    POPSB control scheme

    The supervision application has been developed at CERN using the technologie WinCC-OA-UNICOS.Many views were developed for the operation and diagnostic: detail view on the AC/DC, DC/DC, capacitors banks, interlocks, etc.

    POPSB HMI view

    POPSB HMI view

    topMagnet Protection

    The booster magnets are protected by a WIC (Warm Interlock Controller) system installed in the BT, BTP, BTM transfer lines. The WIC is a Programmable Logic Controller (PLC) based system. It protects the normal conducting magnets from overheating by switching off the power converter when a fault occurs.

    PSB WIC supervision

    PSB WIC supervision

    topMagnet connection

    • Main Magnets / Power Converters connections: The PSB main magnets can be supplied by POPSB or BR_MPS system. The power switch RSOPS.271.RMPS.1 located in the 271 building allows to select the desired power conveter.
    • Magnets are split into 2 equivalent series and 2 separated power converters are used to power each half string of magnets:
      • Rings 1&4 + QFO
      • Rings 2&3 + QDE
      Only 2 trim converters required for quadrupoles.

    Circuit connection

    POPSB Circuit connection


    topMagnet Types

    • Dipole magnets: The BHZ MAIN bending magnet as shown in the picture below features four vertically stacked apertures.

    Dipole magnet.

    Dipole magnet.

    BHZ Main magnet characteristics.

    BHZ Main magnet characteristics.

    • Quadrupole magnets: As per the BHZ magnets the QFO and QDE quadrupole magnets feature four vertically stacked apertures.

    Quadrupole magnet.

    QDE Quadrupole magnet.

    QFO magnet parameters.

    QFO magnet parameters.

    QDE magnet parameters.

    QDE magnet parameters.

    topMachine Installation

    The POPSB equipements are installed inside the building 245:

    POPSB 245 Layout

    POPSB 245 Layout

    topProduction Contract & Contract History

    • Manufacturer: GENERAL ELECTRIC
    • Production year: 2018
    • First cycle in PSB Magnets: December 2018
    • First beam in PSB with POPSB: 2021

    topConverter circuit names