SY-EPC-HPC POPSB General

Power Converter Characteristics

Design & Operation Responsibles

Power Converter Architecture

Power Part

Control Part

Magnet Protection

Magnet Connection

Magnet Types

Machine Installation

Production Contract & Contact History

Power Converter Characteristics

RPOPQ	CERN
Power In	3 ~ 400V/300V 50KVA
Power Out	700A (350A RMS)/550V
Converter Type	Capacitive Storage
Control type	RegFGC3

Operation Responsibles

1st Intervention	Piquet SY-EPC Injector(160391)
Responsibles:	Fulvio BOATTINI
	Aramis SCHWANKA TREVISAN
	Arnaud BESSONNAT
	Manuel COLMENERO MORATALLA

Power Converter Architecture

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:

POPSB.QUAD.A: powers all 1&4 apertures of QFO magnets;

POPSB.QUAD.B : powers all 2&3 apertures of QDE magnets;

POPSB.QUAD.C: can be used to replace either POPSB.QUAD.A or POPSB.QUAD.B.

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.

MPS QUAD cycles

Generic POPS-B MPC and QUAD current demand

Power Part

Power In	3 ~ 400V/300V 50KVA
Power Out	700A peak,350A rms/550V
Cooling type	Air forced

The PANDORA converter design in based on the SATURN converter (developed by SY-EPC-MPC section) with the following modifications:

All electrical components floating with respect to ground, including control and instrumentation

Uprated internal converter energy storage - capacitor bank used in SIRIUS converter (SY-EPC-MPC);

Removal of the brake chopper and crowbar

Replacement of the 3-phase AC passive rectifier with an Active Front End, capable of rectification or inversion/re-generation

Separate transformer cabinet is not required for adaptation/isolation of AC input

POPSB Quads power converter schematic diagram

Control & Regulation Part

POPSB power converter schematic block diagram

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

Magnet 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

Magnet 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