<?xml version="1.0" encoding="UTF-8"?> <collection xmlns="http://www.loc.gov/MARC21/slim"> <record> <controlfield tag="001">2712616</controlfield> <controlfield tag="003">SzGeCERN</controlfield> <controlfield tag="005">20200310212646.0</controlfield> <datafield tag="024" ind1="7" ind2=" "> <subfield code="2">DOI</subfield> <subfield code="9">JACoW</subfield> <subfield code="a">10.18429/JACoW-SRF2019-THP031</subfield> </datafield> <datafield tag="024" ind1="8" ind2=" "> <subfield code="a">oai:inspirehep.net:1780592</subfield> <subfield code="p">cerncds:FULLTEXT</subfield> <subfield code="p">cerncds:CERN:FULLTEXT</subfield> <subfield code="p">cerncds:CERN</subfield> <subfield code="q">INSPIRE:HEP</subfield> <subfield code="q">ForCDS</subfield> </datafield> <datafield tag="035" ind1=" " ind2=" "> <subfield code="9">http://inspirehep.net/oai2d</subfield> <subfield code="a">oai:inspirehep.net:1780592</subfield> <subfield code="d">2020-03-09T14:15:59Z</subfield> <subfield code="h">2020-03-10T08:00:54Z</subfield> <subfield code="m">marcxml</subfield> </datafield> <datafield tag="035" ind1=" " ind2=" "> <subfield code="9">Inspire</subfield> <subfield code="a">1780592</subfield> </datafield> <datafield tag="041" ind1=" " ind2=" "> <subfield code="a">eng</subfield> </datafield> <datafield tag="088" ind1=" " ind2=" "> <subfield code="a">SRF2019</subfield> </datafield> <datafield tag="100" ind1=" " ind2=" "> <subfield code="a">Turaj, Katarzyna</subfield> <subfield code="j">JACoW-00094998</subfield> <subfield code="m">katarzyna.turaj@cern.ch</subfield> <subfield code="u">CERN</subfield> </datafield> <datafield tag="245" ind1=" " ind2=" "> <subfield code="9">JACoW</subfield> <subfield code="a">Operation Experience with the LHC ACS RF System</subfield> </datafield> <datafield tag="260" ind1=" " ind2=" "> <subfield code="c">2019</subfield> </datafield> <datafield tag="300" ind1=" " ind2=" "> <subfield code="a">4 p</subfield> </datafield> <datafield tag="520" ind1=" " ind2=" "> <subfield code="9">JACoW</subfield> <subfield code="a">The LHC accelerating RF system consists of two cryomodules per beam, each containing four single-cell niobium sputtered 400.8 MHz superconducting cavities working at 4.5 K and an average accelerating voltage of 2 MV. The paper summarises the experience, availability and evolution of the system within 10 years of operation. The lessons learned from the successful replacement and re-commissioning of one cryomodule with a spare module, and the recent re-test of the originally installed module on the test stand are also included. 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