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TY - CONF AU - Lobach, I. AU - Halavanau, A. AU - Huang, Z. AU - Kim, K. AU - Lebedev, V.A. AU - Nagaitsev, S. AU - Romanov, A.L. AU - Stancari, G. AU - Valishev, A. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Transverse Beam Emittance Measurement by Undulator Radiation Power Noise J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - Generally, turn-to-turn power fluctuations of incoherent spontaneous synchrotron radiation in a storage ring depend on the 6D phase-space distribution of the electron bunch. In some cases, if only one parameter of the distribution is unknown, this parameter can be determined from the measured magnitude of these power fluctuations. In this contribution, we report the results of our experiment at the Integrable Optics Test Accelerator (IOTA) storage ring, where we carried out an absolute measurement (no free parameters or calibration) of a small vertical emittance (5–15 nm rms) of a flat beam by this new method, under conditions, when the small vertical emittance is unresolvable by a conventional synchrotron light beam size monitor. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2794 EP - 2794 KW - radiation KW - emittance KW - undulator KW - optics KW - synchrotron DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-WEPAB088 UR - https://jacow.org/ipac2021/papers/wepab088.pdf ER -