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TY - CONF AU - Yamashita, H. AU - Kii, T. AU - Masuda, K. AU - Nagasaki, K. AU - Nogi, T. AU - Ohgaki, H. AU - Torgasin, K. AU - Zen, H. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - The Influence of Initial Current Density Distribution on the Emittance Reduction J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - In this study, the influence of current density distribu-tion on the cathode surface on the beam emittance evolution was investigated. The emittance evolution with different beam profiles (flat-top, peak and hollow distribution) have been compared. The modification of the current profile was shown to affect the axial distance of the point of minimal emittance over wide range. The hollow profile allows extending the axial distance of the point of emittance minimum keeping its value extremely low. Further the parameters of a peak profile, which give the smallest emittance were determined. This work demonstrates the significance of initial current density distribution for the emittance evolution. PB - JACoW CP - Geneva, Switzerland SP - 3744 EP - 3746 DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-THPAB023 UR - http://jacow.org/ipac2017/papers/thpab023.pdf ER -