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TY - CONF AU - Fisher, A.S. AU - Clarke, C.I. AU - Field, R.C. AU - Frisch, J.C. AU - Herbst, R.T. AU - Kadyrov, R.A. AU - McKee, B.D. AU - Tao, F. AU - Welch, J.J. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Beam Containment and Machine Protection for LCLS-2 J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - The first km of the 3-km SLAC linac is being replaced by LCLS-2, a superconducting linac with continuous RF and a maximum beam rate of 1 MHz. The beam will have an energy of 4 GeV and a maximum power of 250 kW, with an upgrade to 8 GeV and 1 MW in planning. The beam will be transported through the accelerator tunnel, passing over the future 1-km FACET-2 and the existing 1-km LCLS linacs, both using normal-conducting copper cavities at repetition rates of up to 120 Hz. The LCLS and LCLS-2 beams will continue together through the Beam Transport Hall to two new undulators, for hard and soft x rays. Kickers will direct individual pulses to either undulator or to a dump. The high power in the beam and potentially in cavity field emission necessitate integrating losses over 500 ms but responding within 0.1 ms. A capacitor for integration and a comparator for the threshold give a simple and robust approach over a wide dynamic range. We plan both long loss monitors covering regions of typically 100 m and point monitors. In regions with two or more beamlines, the system will attempt to determine the line that caused a loss, so that only one is shut off. PB - JACoW CP - Geneva, Switzerland SP - 478 EP - 481 KW - ion KW - detector KW - linac KW - radiation KW - electron DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-TH1AB2 UR - http://jacow.org/ibic2017/papers/th1ab2.pdf ER -