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TY - CONF AU - Nghiem, P.A.P. AU - Chauvin, N. AU - Simeoni, W. AU - Uriot, D. AU - Valette, M. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - A Precise Determination of the Core-halo Limit J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - For high-intensity beams, the dynamics of the dense core is different from that of the much less dense halo. Relations between core emittance growth and halo generation are often studied, halo scraping often experienced and halo re-formation observed. For all that, a clear distinction between the core and the halo parts does not exist. This paper proposes a new method for precisely determining the core-halo limit applicable to any particle distribution type. Once this limit is known, the importance of the halo relative to the core can be precisely quantified. The core-halo limit determination may be easily extended to the nD phase space, allowing the definition of emittance and Twiss parameters for the core and the halo separately. PB - JACoW CP - Geneva, Switzerland SP - 3208 EP - 3210 KW - emittance KW - linac KW - space-charge KW - extraction KW - instrumentation DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-THPME003 UR - http://jacow.org/ipac2014/papers/thpme003.pdf ER -