Powering the damping rings wigglers Daniel Siemaszko, Serge Pittet 03.12.2010 OUTLINE : Powering superconductive magnets, Powering wigglers strategy, Existing.

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Presentation transcript:

Powering the damping rings wigglers Daniel Siemaszko, Serge Pittet OUTLINE : Powering superconductive magnets, Powering wigglers strategy, Existing converters, Control and Magnet protection. TE EPC

Superconductive magnets The powering of superconducting magnets doesn't require much power when it comes to DC steady state operation. What counts essentially is the requirement in the dynamics in start/stop procedures which is essentially dependent on the inductance and the applied voltage (U=Ldi/dt). 03/12/2010Daniel Siemaszko, Serge Pittet - EDMS TE EPC In one quadrant operation, the current decreases only with dissipative components. In two quadrants operation, the magnet energy is taken back to the power converter Four quadrant converters allow full flexibility.

Powering CLIC wigglers Wigglers parameters : – L = 1.6 H – I = 600A (possibly 1kA) – Stored Energy = 250kJ (possibly 1MJ) – Precision = 50ppm – dI/dt =1A/s (given by D. Schoerling) Voltage required for bringing one wigglers to nominal current: – V rise =LdI/dt = 1.6V – V cable =3.6V cable =100m, S cable =300mm 2, R cable =6m  ) – V magnet =0? Power converter minimum voltage is 6V. For powering 104 wigglers: – Individual powering: 104 (600A/6V) power converters + 5 spare (30kCHF/converter => 3.3MCHF in total). – Serial powering: 4 (600A/45V) power converter +1 hot spare (55kCHF/convert => 275kCHF in total). In case of 1kA wigglers, price of converter doubles. 03/12/2010Daniel Siemaszko, Serge Pittet - EDMS TE EPC

Similar converter in the LHC Power converter used in LHC to power superconductive magnets, located in underground installation, close to the load to limit cable losses. ±600A/±40V. Current precision: – min – h – year 03/12/2010Daniel Siemaszko, Serge Pittet - EDMS TE EPC

Control High precision current loop managed by digital controller. High precision Analog to Digital Converter digitalizing the analog current measurement coming from DCCT (DC current Transducer). Precision is directly relying on sensor precision DCCT, ADCs and regulation algorithm. High bandwidth low precision voltage loop controlled by slow current high precision regulation loop. 03/12/2010Daniel Siemaszko, Serge Pittet - EDMS TE EPC

Magnet Protection Power converter is part of magnet protection without being responsible of the protection itself, diagnosis and monitoring of the magnet status. Power converter ensures that powering is stopped and its output is shorted in case of ‘Fast abort’. Monitor Earth current in converter and magnet. 03/12/2010Daniel Siemaszko, Serge Pittet - EDMS TE EPC

03/12/2010Daniel Siemaszko, Serge Pittet - EDMS TE EPC Conclusions All technical challenges of CLIC wigglers have been solved for LHC superconductive magnets. Powering of wigglers based on existing and proven solution. Serial connection of wigglers allows reductions in costs, maintenance and spare management (Cold connections allow to reduce overall resistance). Magnet discharge path ensured by power converter through its crowbar. Protection, monitoring and diagnosis of magnet status not performed by the power converter.