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Creating magnetized relativistic pair plasma in the laboratory would enablethe exploration of unique plasma physics relevant to some of the most energeticevents in the universe. As a step towards a laboratory pair plasma, we havedemonstrated effective confinement of multi-$\mathrm{MeV}$ electrons inside apulsed-power-driven $13$ $\mathrm{T}$ magnetic mirror field with a mirror ratioof $2.6$. The confinement is diagnosed by measuring the axial and radial losseswith magnetic spectrometers. The loss spectra are consistent with $\leq 2.5$$\mathrm{MeV}$ electrons confined in the mirror for $\sim 1$ $\mathrm{ns}$.With a source of $10^{12}$ electron-positron pairs at comparable energies, thismagnetic mirror would confine a relativistic pair plasma with Lorentz factor$\gamma \sim 6$ and magnetization $\sigma \sim 40$.

Confinement of relativistic electrons in a magnetic mirror en route to a magnetized relativistic pair plasma