Ionized flux fraction measurements were performed for all pulse power densities presented. Furthermore, three different on-times were also selected for these measurements: 50, 100, and 300 μs. To facilitate comparison between experimental series with different on-times, measurements were performed for the same values of duty cycle and hence also the same pulse power. The period of pulsing was therefore different for each on-time. For 50 μs on-time, a large fraction of Ar+ in the discharge was expected. The stable part of the pulse was likely dominated by a metal plasma [4] and it was reached after about 50 to 100 μs. Pulses with an on-time of 300 μs were therefore expected to contain a larger fraction of Ni+. An on-time of 100 μs was also investigated as an intermediate value between the two extreme cases.