15 ps temporal resolution of the electric field of Coherent Synchrotron Radiation using a high-T$_c$ YBa$_2$Cu$_3$O$_{7-x}$ real-time detection system

Raasch, J.; Thoma, P.; Scheuring, A.; Ilin, K.; Siegel, M.; Müller, A.-S.; Smale, N.; Roussel, E.; Evian, C.; Szwaj, C.; Bielawski, S.; Konomi, T.; Kimura, S.; Katoh, M.; Hosaka, M.; Yamamoto, N.; Zen, H.; Iida, K.; Holzapfel, B.