POPSB - QUAD / PANDORA
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The Quadrupole Trim power converters (PANDORA) are required to match the tune of the machine, and compensate for the additional MPS current due to saturation in the bending magnets.
The Quadrupole focussing (QFO) trim power converter is connected across the 128 QFO magnets (rings 1,2,3,4) and is therefore directly connected to the electrical circuit of Main Power Supply (MPS) POPS-B 1&4.The POPSB.QFO power converter removes current from the quadrupole magnets
The Quadrupole defocussing (QDE) trim power converter will be connected across the 64 QDE magnets (rings 1,2,3,4) and is therefore directly connected to the electrical circuit of Main Power Supply (MPS) POPS-B 2&3.The POPSB.QDE power converter adds current to the quadrupoles magnets.
In total there are three POPSB.QUAD power converters:
The three POPSB.QUAD power converters are identical.
POPSB converter architecture
The current that it to be supplied by the QUAD power converters is a function of both the current provided by the main power converter, the magnetic properties of the magnet to be compensated and the desired tune of the machine. Thus, the QUAD power converters shall be synchronised with the main power converter. The magnet current demand for a generic POPS-B cycle is illustrated in Figure below, with the stages of accelerator operation labelled at the top of the waveform.
Generic POPS-B MPC and QUAD current demand
The PANDORA converter design in based on the SATURN converter (developed by SY-EPC-MPC section) with the following modifications:
POPSB Quads power converter schematic diagram
POPSB power converter schematic block diagramThe 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 viewWIC (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
POPSB Circuit connection
QDE Quadrupole magnet.
QFO magnet parameters.
QDE magnet parameters.
The POPSB equipements are installed inside the building 245:
POPSB 245 Layout