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TY - CONF AU - Fiorito, R.B. AU - Conde, M.E. AU - Mete Apsimon, O. AU - Neveu, N.R. AU - Power, J.F. AU - Shkvarunets, A.G. AU - Welsch, C.P. AU - Zhang, H.D. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Validation of a Novel Emittance Diagnostic Method for Beams with Significant Space Charge J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - Exact knowledge of beam emittance is of central importance for essentially every accelerator. However, there are only few methods to determine it when the beam has significant space charge. We report on our progress to validate a novel diagnostic method that has been proposed to determine the RMS emittance of an electron beam with space charge. This method uses RMS divergence and beam size data measured at a screen placed in a free drift region for selected values of magnetic focusing strength. A novel algorithm is then used to determine the cross correlation term and consequently the RMS emittance of the beam. Simulations, quadrupole scans, phase space tomography and optical diffraction-dielectric foil radiation interferometry are currently being employed to determine and compare the horizontal (x) and vertical (y) emittances of the 14 MeV witness electron beam at Argonne National Laboratory's Wakefield Accelerator. The results of simulations and current measurements are presented and the advantages of the new technique are discussed. PB - JACoW CP - Geneva, Switzerland SP - 451 EP - 454 KW - emittance KW - space-charge KW - focusing KW - quadrupole KW - simulation DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-MOPAB137 UR - http://jacow.org/ipac2017/papers/mopab137.pdf ER -