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TY - CONF AU - Ruisard, K.J. AU - Aleksandrov, A.V. AU - Shishlo, A.P. ED - Tavares, Daniel ED - Picoreti, Renan ED - Bruno, Gustavo ED - Marques, Sergio ED - Schaa, Volker R.W. TI - Virtual Slit for Improved Resolution in Longitudinal Emittance Measurement J2 - Proc. of IBIC2020, Santos, Brazil, 14-18 September 2020 CY - Santos, Brazil T2 - International Beam Instrumentation Conference T3 - 9 LA - english AB - A technique to reduce point-spread originating from physical slit width in emittance measurements is described. This technique is developed to improve phase resolution in a longitudinal emittance apparatus consisting of a dipole magnet, energy-selecting slit and bunch shape monitor. In this apparatus, the energy and phase resolutions are directly proportional to the width of the slit, but the virtual slit method enables sub-slit resolution. The bunch phase profile is measured at two points in the energy distribution with a separation less than the physical slit width. The difference of these two profiles is used to reconstruct the profile from a virtual slit of width equal to the separation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 241 EP - 245 KW - simulation KW - emittance KW - dipole KW - rfq KW - quadrupole DA - 2020/10 PY - 2020 SN - 2673-5350 SN - 978-3-95450-222-6 DO - doi:10.18429/JACoW-IBIC2020-THPP20 UR - https://www.jacow.org/ibic2020/papers/thpp20.pdf ER -