Dependence of the confinement time of an electron plasma on the magnetic field in a quadrupole Penning trapB M Dyavappa, Durgesh Datar, Prakash and Sharath AnanthamurthyEPJ Techn Instrum, 4 1 (2017) 4DOI: https://doi.org/10.1140/epjti/s40485-017-0039-4