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TY - CONF AU - Cox, M.P. AU - Burrows, C. AU - Day, A.G. AU - Dymoke-Bradshaw, J.A. AU - Grant, R.K. AU - Hammond, N.P. AU - Liu, X. AU - Miller, A.G. AU - Shiers, H.S. AU - Warner, N. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Conceptual Design of the Diamond-II Vacuum System J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The conceptual design of the vacuum system for the Diamond-II storage ring upgrade is described. Due to the small vessel cross section, typically 20 mm inside diameter (ID), and the consequent conductance limitation, distributed pumping is provided by non-evaporable getter (NEG) coating supplemented by ion pumps at high gas load locations. In-situ bakeout is incorporated to allow rapid recovery from both planned vacuum interventions and unplanned vacuum events. The vacuum vessels are constructed mainly from copper alloy while stainless steel is used in regions of AC magnets requiring low electrical conductivity. The proposed layout, engineering and build sequence of the vacuum system are described along with gas flow simulations confirming the vacuum performance advantages of NEG-coated vessels compared with uncoated vessels. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1362 EP - 1364 KW - vacuum KW - photon KW - storage-ring KW - target KW - controls DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP050 UR - http://jacow.org/ipac2019/papers/tupmp050.pdf ER -