779205 SzGeCERN 20230531152234.0 DOI 10.5170/CERN-2005-001.123 oai:cds.cern.ch:779205 cerncds:FULLTEXT DOI cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-721 eng CERN-LHC-Project-Report-721 Baglin, V Pressure and Heat Load in a LHC Type Cryogenic Vacuum System Subjected to Electron Cloud 2005 CERN Geneva CERN 14 Jul 2004 16 p The electron cloud is of major concern for most of the storage rings operating with large bunch currents and low bunch spacing. The Large Hadron Collider (LHC) operated at cryogenic temperature will have to face the electron cloud when running with proton beams. For this reason, the first experimental studies related to the electron cloud in a LHC type cryogenic vacuum system have been launched in 2002 after the closure of the Electron Positron Accumulator (EPA) synchrotron radiation experimental program. The cold bore experiment (COLDEX) has been installed in the CERN Super Proton Synchrotron (SPS) where electron clouds could be produced with proton beams. The detailed results of the investigations, which include measurements of the dynamic heat deposition, dynamic total pressure rise and residual gas composition as a function of beam operation dose will be presented. The beam conditioning efficiency is studied as a function of temperature. The results of dedicated experiments with pre-condensed gas layers onto the beam screen are shown. The preliminary results with 75 ns bunch spacing are presented. The experimental results obtained as a function of beam operation dose are compared to the outputs of the ECLOUD simulation code. Finally, the implications to the LHC design and operation are discussed. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE YELLOWREPCONTRIB CERN LHC Not applicable Jenninger, B LHC http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-721 Fulltext http://documents.cern.ch/cgi-bin/setlink?base=yellowarticle&categ=2005-001&id=p123 Published version from CERN http://cds.cern.ch/record/779205/files/lhc-project-report-721.pdf Fulltext http://cds.cern.ch/record/779205/files/p123.pdf Published version from CERN evelyne.delucinge@cern.ch CERN n 200433 a2005 13 20100401 2001 CER01 20040721 719657 123-137 napa20040419 PUBLIC 002469829CER ARTICLE ConferencePaper 0001