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TY - CONF AU - Santana-Leitner, M. AU - Ibrahimov, A. AU - Nicolas, L.Y. AU - Rokni, S.H. AU - Walz, D.R. AU - Welch, J.J. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Beam Dumps of the New LCLS-II J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - In 2013 the design of the new LCLS-II new hard X-FEL facility at the SLAC National Accelerator Laboratory was rescoped to operate two parallel variable gap undulator lines at repetition rates up to 1MHz and above. A new superconducting RF structure will be installed in the first third of the SLAC two-mile Linac to provide a few hundred kWof beam power at energies of up to 4 GeV. This paper describes the radiological aspects of the dumps that are being designed for the end of the electron beam lines. A layered arrangement of shielding materials is being optimized to reduce instantaneous dose leakage to occupied areas, minimum cool-down time to access the tunnel, and impact to equipment and to the environment. Calculations deal with numerous constraints, as legacy beam components will be used, and the existing tunnel structure was designed for beam powers fifty times below those envisaged for LCLS-II. PB - JACoW CP - Geneva, Switzerland SP - 3973 EP - 3975 KW - shielding KW - electron KW - neutron KW - radiation KW - operation DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-THPRI086 UR - http://jacow.org/ipac2014/papers/thpri086.pdf ER -