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Magnetic Field Behavior in High and Low Voltage Systems for LHC Experiments

Explore strategies for working in magnetic fields in LHC experiments, including power supply design and shielding. Test setups and results for different power supply modules and coil designs are discussed. Acknowledgments for cooperation with IEN and refined testing methods are highlighted.

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Magnetic Field Behavior in High and Low Voltage Systems for LHC Experiments

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  1. Magnetic Field Behaviour of Different HV and LV Systems for LHC Experiments 9th Workshop on Electronicsfor LHC Experiments Luciano Periale, Bruno Allongue CERN EP-ESS

  2. Summary • Different strategies for working in magnetic field: • by designing a high efficiency Power Supply with a new conception (CAEN) • with a suitable Power Supply shielding (WIENER) • CAEN and WIENER solutions and tests • Conclusions Luciano Periale, Bruno Allongue CERN EP-ESS

  3. Introduction • ALICE n-TOF requirements: • magnetic field tolerance up to 8 KG • CMS expected: • magnetic field in the range, 1.5 – 2.0 KG • IEN - Cooperation in magnetic metrology and standards, calibration and testing • CERN facilities – magnets of different dimensions and B field Luciano Periale, Bruno Allongue CERN EP-ESS

  4. CAEN R&D in Cooperation with IEN (I) • ’00: A selected choice of different compounds (ceramics etc.) for the toroidal coil to avoid magnetic saturation • Analysis of various types of wires to obtain the adequate coils • Optimization among several types of circuits for transformers • ’01: A new design (Patent Pending) for a family of high and low voltage DC/DC converters… Luciano Periale, Bruno Allongue CERN EP-ESS

  5. The CAEN SASY 2000 • A “functional prototype” solution Luciano Periale, Bruno Allongue CERN EP-ESS

  6. SASY 2000 Design • SASY 2000 Power Supply and Control: Implementation… Luciano Periale, Bruno Allongue CERN EP-ESS

  7. SA 2002 - 2 Ch Low Voltage Module • Main features for each channel • V out • 4.5 - 5.5 V • 6.5 - 7.5 V • I out • 2 A • 1 A • Ripple = < 20 mV pp Luciano Periale, Bruno Allongue CERN EP-ESS

  8. SA2004 - 1 Ch Low Voltage High Current Module • Main features • V out = 4 ÷ 6 V • I out = 60 A • Ripple = < 150 mV pp Luciano Periale, Bruno Allongue CERN EP-ESS

  9. Magnetic Field Test at CERN, 2001-2003 Luciano Periale, Bruno Allongue CERN EP-ESS

  10. Test Setup SASY 2004 (60 Amps) Luciano Periale, Bruno Allongue CERN EP-ESS

  11. Tests performed on a single SA2004 channel • Channel efficiency checked in the following condition: • Vin = 45.5 Volt, 48 Volt, 50.5 Volt • Vout = 5 Volt • Iout = 30, 40, 50 Amp • B = 0, 1, 3, 5 KG Luciano Periale, Bruno Allongue CERN EP-ESS

  12. SA2004 - Test Results Worst Case: Luciano Periale, Bruno Allongue CERN EP-ESS

  13. SA200x Tests Performed • Channel efficiency checked in the following condition: • Vout = 5 Volt • Iout = 40, 60, 80 Amp • B //and  = 0, 1, 2, 3, 4, 5 KG Luciano Periale, Bruno Allongue CERN EP-ESS

  14. Worst Case: SA200x Test Results - 1 Luciano Periale, Bruno Allongue CERN EP-ESS

  15. Best Case: SA200x Test Results - 2 Luciano Periale, Bruno Allongue CERN EP-ESS

  16. CMS-MNP2 Magnetic Map using Hall Calibrating Probes by IEN Luciano Periale, Bruno Allongue CERN EP-ESS

  17. Test SetupCMS MNP22 used for the final tests Test layout Luciano Periale, Bruno Allongue CERN EP-ESS

  18. SASY 2008 (100Amps) 16Ch-Distr. SASY2007 (7A-max) 48V Power Supply Test Magnet (6500Gauss-max) Active Load CAEN SY 2527 System (controller) Luciano Periale, Bruno Allongue CERN EP-ESS

  19. SASY2007 (2 single channels 7A-max) 16Ch - Distributor SASY 2008 (100Amps) Luciano Periale, Bruno Allongue CERN EP-ESS

  20. V V 1 4 V2 V3 CAEN SY 2527 SA2008 - - + + Out In Shunt (2 mΩ) R1 R4Shunt (1 mΩ) 0.1 V – 50 A 0.1 V – 100 A Active Load - + 48 V Luciano Periale, Bruno Allongue CERN EP-ESS

  21. V 1 V 4 V3 V2 CAEN SY 2527 SA2008 Distributor 16 channels In - - + + In Out Out Out Shunt (2 mΩ) R1 Shunt (1 mΩ) 0.1 V – 100 A 0.1 V – 50 A R4 Carico static (16 resistor passive) - + 48 V Luciano Periale, Bruno Allongue CERN EP-ESS

  22. Luciano Periale, Bruno Allongue CERN EP-ESS

  23. Luciano Periale, Bruno Allongue CERN EP-ESS

  24. Luciano Periale, Bruno Allongue CERN EP-ESS

  25. WIENER - The Classical Approach

  26. Coils sensitive to B field 5mm soft iron shielding Power Modules • A classical approach: • magnetic shielding of standard components • water cooling Luciano Periale, Bruno Allongue CERN EP-ESS

  27. Tests • Increase B field by steps of 50 Gauss • Check output voltage and ripple Luciano Periale, Bruno Allongue CERN EP-ESS

  28. ESS Test Magnet • Max field 1.8kG • Aperture ~ 18cm Luciano Periale, Bruno Allongue CERN EP-ESS

  29. Tests Luciano Periale, Bruno Allongue CERN EP-ESS

  30. Tests cont. Luciano Periale, Bruno Allongue CERN EP-ESS

  31. Tests cont. Luciano Periale, Bruno Allongue CERN EP-ESS

  32. Tests cont. • Ripple: Luciano Periale, Bruno Allongue CERN EP-ESS

  33. Conclusions • The two different approaches to magnetic field tolerance have allowed practical solutions to be achieved for specific applications • New technology for high-fields • Classical screening of sensitive components for lower fields • Test methods and procedures have been refined Luciano Periale, Bruno Allongue CERN EP-ESS

  34. Acknowledgments • We thank all LHC groups for their help and the open cooperation • I wish to address a peculiar thank to the IEN colleagues for their constant high class professionalism Luciano Periale, Bruno Allongue CERN EP-ESS

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