BNL - Superconducting Accelerator Magnets [presentation by R. Gupta

By R. Gupta

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In that case you get A+; No questions asked). Good luck and enjoy the rest of the course !!! January 16-20, 2006, Superconducting Accelerator Magnets Slide No. 31 of Lecture 1 (Introduction) Ramesh Gupta, BNL Lecture II Superconducting Magnet Division Superconductivity (A brief and limited overview) Ramesh Gupta Superconducting Magnet Division Brookhaven National Laboratory US Particle Accelerator School Arizona State University Phoenix, Arizona January 16-20, 2006 January 16-20, 2006, Superconducting Accelerator Magnets Slide No.

2 Scaling Ratio, Ic(T,B)/Ic(77K,0) High Temperature Superconductors (HTS) now carry significantly higher current over Low Temperature Superconductors (LTS), at low temperature high fields (see below) or at high temperature low fields (see right). 9 2 Parallel Magnetic Field (Tesla) January 16-20, 2006, Superconducting Accelerator Magnets Slide No. 31 of Lecture 2 (Superconductivity) Ramesh Gupta, BNL Superconducting Magnet Division High Field Superconductors Differences between Low field and High field superconductors: Low field superconductors (NbTi) are ductile.

RF cavities are made with high purity Niobium Note: Niobium (Nb) is only one of three metals that is Type II superconductor (others are vanadium and technetium). Hc1 of Niobium ~ kG. Note that high purity bulk Niobium (RRR >150) is Type I superconductor. January 16-20, 2006, Superconducting Accelerator Magnets Slide No. 16 of Lecture 2 (Superconductivity) Ramesh Gupta, BNL Superconducting Magnet Division Flux Jumping Initially, when the field is raised, large screening currents are generated to oppose the changes.

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