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A new italian test facility for accelerator magnets

This article discusses the establishment of a new infrastructure (NAFASSY) for power superconductivity testing in Italy. The facility, funded in 2011, boasts advanced equipment like a large refrigeration system, power converters, and a Nb3Sn CICC solenoid. The laboratory enables various activities in power superconductivity and magnet testing, promoting self-sustainability. The INFN targets the superconducting magnet test facility and manages essential equipment to support its objectives. The cryogenic plant, fast-ramped Power Converter, and superconducting HTS current leads are essential components of this facility promoting advancements in power superconductivity.

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A new italian test facility for accelerator magnets

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  1. A new italian test facility for accelerator magnets Umberto Gambardella G. Iannone, A. Saggese, A. Ferrentino, N. Califano INFN Sezione di Napoli, Gruppo Collegato di Salerno

  2. Overview • INFN motivation for new infrastructure • Joining different needs to make a strong proposal • The infrastructure potentials • INFN targets and equipment • Conclusion

  3. INFN motivations In the recent past the the DISCORAP project (a prototype dipole for the FAIR SIS300 machine) made it clear there was not a laboratory where to perform a full test of such advanced magnet, so we just performed limited tests at our LASA laboratory. DISCORAP prototype: 4.5 T bended dipole 4 m long, 6 tons weight ramp rate 1 T/s

  4. We did not have available any cryogenic plant providing supercritical He. • We did not have available a suitable Power Converter to run the magnet at 1 T/s. Actually the study of losses in power superconductivity is of primary interest. The easiest way to procure these (expensive) equipment is to use special funds available for underdeveloped areas. The drawback is that the infrastructure must be installed in the underdeveloped regions.

  5. A wider approach To strengthen the proposal we take the opportunity that also ENEA was looking for support to its high current CICC cable test facility. Finally, due to long and withstanding cooperation with University of Salerno, it became a natural host institution where to realize a new infrastructure for power superconductivity (NAFASSY). A joint proposal was submitted on Aug. 2011, and funded with 10.8 M€ in Dec. 2011.

  6. Università di Salerno, € 2.375.634,34 (+ 700 k€ per la formazione) ENEA, € 2.541.903,50 INFN, Sezione di Napoli, € 3.472.586,20 CRdC scarl, Napoli, € 1.709.875,96 PON a3_0007 rafforzamentostrutturaleRealizzazione di una facility di test per magnetisuperconduttori e misure di correntecritica

  7. The infrastructure potentials The laboratory is provided with • A large refrigeration system, able to provide cold He stream, either supercritical or two phase, up to 15 g/s at 4.6K, additional refrigeration power of 500 W at 60-80K, and 1.5 g/s at 4.6K for superconducting current leads • A Power Converter able to provide up to 20kA +/- 25V (or 10kA +/-50V) at 2500A/s

  8. A large bore (1150 mm) Nb3Sn CICC solenoid able to achieve a central field of 7 T at 20 kA, the ENFASI magnet • A 50 kA Power Converter (+10V) With such equipment the laboratory can perform several activities in the field of power superconductivity, ranging from critical current measurements of CICC power cables (e.g. fusion magnets cables) to a test facility of magnets (e.g. accelerator magnets), including several services related to cryogenic technologies. Our target is the self sustainability of the laboratory, according to the funding rules

  9. INFN targets and equipment In this joint program INFN defined as its target the superconducting magnet test facility, thus INFN has procured and manage: • the cryogenic plant • the fast ramped Power Converter • the superconducting HTS current leads Of course all these items had also to serve the ENFASI facility for critical current test.

  10. Cooling Tower: 20m3/h of water at 25ºC, 300kW He gas storage: V=30m3, P=12bar Power supply for magnet biasing: 20kA, +25V/-20V 10kA, +50V/-40V Kaeser Compressor 20kA Current leads Cold Box 200W @4.5K 500W @60K Gas management skid Connection box ENFASI magnet: 7 T, 1150 mm bore DC Power supply for samples: 50kA, +12V Connection cryostat

  11. The cryogenic plant The minimum ideal power to be used at RT for extracting power at 4.6 K is 70 W (RT)/1 W (4 K). Actually this figure is much worse, depending mostly on the size of the plant: from 8kW/W for small cryocoolers to 300W/W for large (kW order) cryogenic plants.

  12. Actually two preset refrigeration modes have been implemented in the refrigerator control system: • accelerator dipole; • ENFASI magnet; Either modes foresee the use of supercritical He stream at 4.6 K An additional liquefier mode is also available, as well as a full manual control of the cold box parameters.

  13. The power converter Producer: DANFYSIK A/S DK-2630 Taastrup, DK Outputs: 20 kA - 25 Volts 10 kA - 50 Volts Main Input is 400 Volts ac 3 Phase Water cooled The power converter is made of two 10 kA converters that can be switched in series/parallel to achieve either high voltages (for SIS300 dipoles) or high currents (e.g. for the ENFASI solenoid). The controller is able to provide custom current profiles as well as subsequent cycles of a customized profile for specific applications.

  14. The current leads: introducing new flexibility A current lead has the special function to deliver the power from the room temperature side to the cryogenic environment. It has great influence on the cryogenic losses of devices, and has to be designed carefully. In recent years the use of HTS have been pursued to reduce the heat load at low temperature. It can be found that exists a fixed ratio among the length L and the cross sectional area S for a current lead connecting two temperatures TH (hot) and TC (cold):   being (T) the electrical resistivity of the lead, (T) its thermal conductivity, and I0 the current flowing into the lead.

  15. Combining the Joule effect dissipation QJ and the Fourier heat conduction QF we have: Most metals obey to the Wiedemann-Franz law : Vapor cooled leads steady state equation where dm/dt is the cooling gas mass flow rate to be optimized

  16. Thermal map of the current lead: Left I = 12 kA - Right I = 20 kA + LN2

  17. Conclusion • A large investment for power superconductivity has been done at University of Salerno site, pushed from ENEA and INFN needs. • The new facility can perform accelerator magnet cryogenic tests, widening the possibilities of the infrastructures already working in INFN laboratories (Genova and Milano). It will be ready for magnet test by 2016, and in 2017 the facility for critical current measurement will be also operational. • This new laboratory has a self sustainability target, which means no extra charge for the partners which realized it.

  18. THANK YOU FOR YOUR ATTENTION

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