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TY - CONF AU - Mitsuhashi, T.M. AU - Boland, M.J. AU - Corbett, W.J. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Horizontal Opening of the Synchrotron Radiation and Effect of Incoherent Depth of Field for Horizontal Beam Size Measurement J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - The incoherent depth-of-field due to the instantaneous opening angle of dipole SR emission can influence horizontal beam size measurements. In particular, for double-slit spatial interferometry, the opening angle introduces an intensity imbalance across the two slits that reduces interference contrast and therefore increases the apparent beam size. To investigate this effect, the instantaneous horizontal opening of the SR light must be known. Schwinger's theory gives the vertical opening angle and the qualitative theory of K.J. Kim gives an estimate for horizontal opening angle. An extension of Schwinger's theory to the horizontal plane by one of the authors leads to the same Bessel function distribution as the vertical plane using integration by parts. Neglecting the cubic phase term in the exponent, the expression agrees with Kim's diffraction theory. Using this result to correct for incoherent depth-of-field effects in double-slit measurements at the Australian Synchrotron, ATF and SPEAR3, the measured horizontal beam size is in good agreement with design values. PB - JACoW CP - Geneva, Switzerland SP - 364 EP - 368 KW - ion KW - radiation KW - synchrotron KW - synchrotron-radiation KW - dipole DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-WEPCC09 UR - http://jacow.org/ibic2017/papers/wepcc09.pdf ER -