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MICE Note-238 The Calculated and Measured Resistance for Splices between Conductors in a MICE Superconducting Coil Michael A. Green a , Dan Dietderich a , Hugh C. Higley a , Heng Pan b , Darren G. Tam a , Frederic Trillaud a , Li Wang b , Hong Wu b , and Feng Yu Xu b a )Lawrence Berkeley Laboratory, Berkeley CA 94720, USA b) Institute for Cryogenics and Superconductive Technology, HIT, Harbin China 1 March 2009* Abstract The resistance of superconducting joints within MICE coils is an important issue particularly for the coupling coils. The MICE tracker solenoids have only two superconducting joints in the three spectrometer set (end coil 1, the center coil and end coil 2). The AFC magnets may have only a single joint within the coil. The coupling coils may have as many as fifteen joints within the coil, due to relatively short piece lengths of the superconductor. LBNL and ICST looked at three types of coil joints. They are; 1) cold fusion butt joints, 2) side-by-side lap joints, and 3) up-down lap joints. A theoretical calculation of the joint resistance was done at LBNL and checked by ICST. After looking at the theoretical resistance of the three types of joints, it was decided that the cold welded butt joint was not an attractive alternative for joints within a MICE superconducting magnet coil. Side-by-side and up-down lap joints were fabricated at ICST using two types of soft solder between the conductors. These conductor joints were tested at LBNL at liquid helium temperatures over a range of magnetic fields. The joint resistance was compared with the theoretical calculations. Measurements of splice strength were also made at 300 K and 77 K. TABLE OF CONTENTS Abstract Theoretical Calculations of MICE Coil Joint Resistance Fabrication of Superconductor Joints at ICST Conductor Joint Resistance Measurement Technique Measured Joint Resistance Compared with Calculated Joint Resistance Measurements of the Joint Breaking Strength Some Concluding Comments Acknowledgements References * Last revision 8 March 2009 Page