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TY - CONF AU - Lobach, I. AU - Halavanau, A. AU - Huang, Z. AU - Kim, K. AU - Lebedev, V.A. AU - Murokh, A.Y. AU - Nagaitsev, S. AU - Romanov, A.L. AU - Shaftan, T.V. AU - Stancari, G. AU - Yakimenko, V. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab, with an InGaAs PIN photodiode and an integrating circuit. In this paper, we present a theoretical model for the experimental data from previous similar experiments and in our present experiment, we attempt to verify the model in an independent and a more systematic way. Moreover, in our experiment we consider the regime of very small fluctuation when the contribution from the photon shot noise is significant, whereas we believe it was negligible in the previous experiments. Accordingly, we present certain critical improvements in the experimental setup that let us measure such a small fluctuation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 934 EP - 937 DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-THYBA5 UR - http://jacow.org/napac2019/papers/thyba5.pdf ER -