3D NUMERICAL MODEL TO INVESTIGETE CABLE TWISTING PATTERN FOR SUPERCONDUCTING CENTARAL SOLENOID OF SST-1

Abstract

Under upgradation activities for SST-1, it is decided to design and manufacture superconducting central
solenoid based on Nb3Sn cable in conduit conductor (CICC). Optimization of cabling technology is under progress with
simulation and cabling trials. Multi-stage twisted superconducting cable is the main component of SST-1 CS. It is critical
to understand twisting pattern to estimate the performance of conductor. 3D Numerical model is developed using matrix
methodology to project trajectories of strands during cabling process for Nb3Sn CICC of CS.
The neighbouring relation between the Nb3Sn and copper as well as the contact angle between the strands in the
superconducting cable has been identified using simulation of the twisting pattern. Multistage twisting pattern for
3×3×4×5 configuration with required twist pitch for single strand and multistrands in each stage is modelled in this 3D
model. The inputs obtained from this numerical investigation will used to study stress-strain state of strands for
optimization of cabling process using finite element method.