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The emerging field of orbitronics exploits the electron orbital momentum$\textit{L}$. Compared to spin-polarized electrons, $\textit{L}$ may allowmagnetic-information transfera with significantly higher density over longerdistances in more materials. However, direct experimental observation of$\textit{L}$ currents, their extended propagation lengths and their conversioninto charge currents has remained challenging. Here, we optically triggerultrafast angular-momentum transport in Ni|W|SiO$_2$ thin-film stacks. Theresulting terahertz charge-current bursts exhibit a marked delay and width thatgrow linearly with W thickness. We consistently ascribe these observations to aballistic $\textit{L}$ current from Ni through W with giant decay length (~80nm) and low velocity (~0.1 nm/fs). At the W/SiO$_2$ interface, the $\textit{L}$flow is efficiently converted into a charge current by the inverse orbitalRashba-Edelstein effect, consistent with ab-initio calculations. Our findingsestablish orbitronic materials with long-distance ballistic $\textit{L}$transport as possible candidates for future ultrafast devices and an approachto discriminate Hall- and Rashba-Edelstein-like conversion processes.

Time-domain observation of ballistic orbital-angular-momentum currents with giant relaxation length in tungsten