Tremendously increased lifetime of MCP-PMTs. - Lehmann, A.; Britting, A.; Eyrich, W.; Pfaffinger, M.; Uhlig, F.; Belias, A.; Dzhygadlo, R.; Gerhardt, A.; Götzen, K.; Kalicy, G.; Krebs, M.; Lehmann, D.; et al. (Nuclear Instruments & Methods in Physics Research Section A, 2017)