Development of Superconducting Electrical Joints for a Superconducting Shim Coil System in the Baryon Antibaryon Symmetry Experiment

The standard model of particle physics has been observed to be both incredibly successful and incomplete at the same time. Despite its success, it is unable to correctly predict the observed baryon asymmetry in the universe, known as the baryon asymmetry problem. Mod ern particle physics experiments investigate physics beyond the standard model by making measurements of fundamental predictions made by the model. BASE makes world-leading high-precision measurements on protons/anti-protons as a search for CPT symmetry violation. They make these measurements inside of Penning traps. One possibility is to test the CPT invariance theorem, which states that a particle is invariant under combination of charge conjugation (C), parity transformation (P), and time reversal (T). This is true for any local relativistic point-particle field theory, which means that testing CPT invariance tests the most fundamental assumptions of our current under standing of Nature. BASE tests CPT by comparing fundamental properties of particles and anti-particles. BASE measures the anti-proton-to-proton charge to mass ratio and the comparison of the proton and antiproton magnetic moment. BASE compares the charge to mass ratio of protons and antiprotons by testing the equation qp/mp = − qp¯/ mp¯ , (1) where the quantities are measured through the free cyclotron frequency νc = qB/2πm (2) for a particle in a Penning trap. The magnetic moment of protons and anti-protons is measured via g/2 = νL/νc (3) where νL is the Larmor frequency and νc is the free cyclotron frequency. This report discusses work towards the improvements of systematic magnetic field effects which are holding back these two precision measurements.