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TY - CONF AU - Peterson, D.P. AU - Alexander, J.P. AU - Chatterjee, A. AU - Ehrlichman, M. P. AU - Flanagan, J.W. AU - Heltsley, B.K. AU - Lyndaker, A. AU - Rider, N.T. AU - Rubin, D. L. AU - Seeley, R.D. AU - Shanks, J.P. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Low Energy Coded Aperture Performance at the CesrTA x-Ray Beam Size Monitor J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - We report on the design and performance of coded aperture optics elements in the CesrTA x-ray beam size monitor (xBSM). Resolution must be sufficient to allow single-turn measurements of vertical beam sizes of order 10um by imaging synchrotron radiation photons onto a one-dimensional photodiode array. Measurements with beam energies above 2.1GeV and current above 0.1mA can be performed with a single-slit (pinhole) optic. At lower energy or current, small beam size measurements are limited by the diffractive width of a pinhole image and counting statistics. A coded aperture is a multi-slit mask that can improve on the resolution of a pinhole in two ways: higher average transparency improves counting statistics; and the slit pattern and masking transparency can be designed to obtain a diffractive image with narrower features. We have previously implemented coded apertures that are uniform redundant arrays (URA). A new coded aperture design is optimized for imaging with 1.8 GeV beam energy (1.9keV average x-ray energy) and with beam sizes below 20um. Resolution measurements were made in December 2013. Performance of the new coded aperture is compared to the pinhole and the URA. PB - JACoW CP - Geneva, Switzerland SP - 3741 EP - 3743 KW - detector KW - electron KW - synchrotron KW - photon KW - operation DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-THPME196 UR - http://jacow.org/ipac2014/papers/thpme196.pdf ER -