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TY - CONF AU - Arnold, P. AU - Fydrych, J. AU - Hees, W. AU - Jurns, J.M. AU - Wang, X. AU - Weisend, J.G. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - The ESS Cryogenic System J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - Cryogenic cooling is vital for large sections at ESS. The ESS cryogenic system comprises three separate helium refrigeration/liquefaction plants and an extensive cryodistribution system. Mainly there is a 2.0 GeV proton linac using superconducting RF cavities operating at 2 K. In addition to cooling the SRF cavities, cryogenics is also used for the cold hydrogen moderator surrounding the target. There is also a cryogenic installation associated with the site acceptance testing of the ESS cryomodules. ESS furthermore uses both liquid helium and liquid nitrogen in a number of the neutron instruments. The test stand cryoplant will as well provide liquid helium for neutron instrument sample environments and comprise a helium purification unit. Together with the gas management, helium recovery and a considerable cold and warm storage system, cryogenics form a substantial part of ESS. This paper describes the current conceptual design of the ESS cryogenic system including the expected heat loads and operating modes for the linac cryoplant. Challenges associated with the required high efficiency, reliability and turn-down capability will be discussed. PB - JACoW CP - Geneva, Switzerland SP - 2756 EP - 2758 KW - cryogenics KW - cryomodule KW - linac KW - target KW - neutron DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-WEPRI109 UR - http://jacow.org/ipac2014/papers/wepri109.pdf ER -