Thomsen, H., Langenberg, A., Zhang, D., Bertschinger, G., Biedermann, C., Biel, W., et al. (2015). Startup impurity diagnostics in Wendelstein 7-X stellarator in the first operational phase. Journal of Instrumentation, 10: P10015. doi:10.1088/1748-0221/10/10/P10015.