Abstract: Described herein are systems and methods for ensuring plasma homogeneity in a discharge cell. The discharge cell may include a first hollow electrode and a second hollow electrode spaced away from the first electrode to define a discharge gap therebetween. A fluid inlet port may in fluid communication with an internal bore of the first electrode. A fluid outlet port may be in fluid communication with the discharge gap. A first pair of viewports may define a first optic pathway through the discharge gap. A second pair of viewports may define a second optic pathway through the discharge gap. A third pair of viewports may define a third optic pathway through the discharge gap, the third optic pathway defined through the hollow interior of the first and second electrodes.