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@InProceedings{lumpkin:ibic2020-tupp18, author = {A.H. Lumpkin and K.P. Wootton}, title = {{Observations of Optical Synchrotron Radiation from Ultra-low Charges Stored in a Ring Operating at 425 MeV}}, booktitle = {Proc. IBIC'20}, pages = {61--65}, paper = {TUPP18}, language = {english}, keywords = {electron, background, photon, radiation, synchrotron}, venue = {Santos, Brazil}, series = {International Beam Instrumentation Conference}, number = {9}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2020}, issn = {2673-5350}, isbn = {978-3-95450-222-6}, doi = {10.18429/JACoW-IBIC2020-TUPP18}, url = {https://www.jacow.org/ibic2020/papers/tupp18.pdf}, note = {https://doi.org/10.18429/JACoW-IBIC2020-TUPP18}, abstract = {The initial observations of optical synchrotron radiation (OSR) emitted over millions of passes from a few electrons circulating in the Particle Accumulator Ring (PAR) at the Advanced Photon Source have been done with a digital CMOS camera and a synchroscan streak camera operating at 117.3 MHz. The discrete changes of integrated counts in the CMOS image region of interest are ascribed to single electron steps at ~3500 cts per electron. Circulations of a single electron at 375 MeV and at 425 MeV were demonstrated in the 12-bit digital FLIR USB3 camera images. The Hamamatsu C5680 streak camera operating at the 12th harmonic of the fundamental revolution frequency at 9.77 MHz was used to measure the zero-current bunch length from 0.5 nC circulating charge down to 10s of electrons or <10 aC. The latter cases were performed with 6-ps temporal resolution for the first time anywhere, to our knowledge. We report a preliminary effective bunch length of 276 ± 36 ps for 57 electrons (9.1 aC) stored based on a fit to a single Gaussian peak. The results will be compared to the standard zero-current model for the ring.}, }