Polar charts are provided not by a series type, but by an axis type. The PolarXAxis and PolarYAxis transform a standard SciChartSurface into a Polar chart:

Further Reading

For further information, please see the The Polar Charts Type  documentation article.

Also there are several examples that demonstrate features of Polar Charts available in SciChart Examples Suite:

• Polar Chart
• Polar Chart With Annotations
• Dashboard Style Polar Charts
• Realtime Polar Charts
• Polar Chart with Multiple Axis