434210 SzGeCERN 20230531152001.0 oai:cds.cern.ch:434210 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERCER 2183783 LHC-Project-Report-375 eng CERN-LHC-Project-Report-375 Moulard, G Industrial Surfaces Behaviour Related to the Adsorption and Desorption of Hydrogen at Cryogenic Temperature 2000 Geneva CERN 11 Apr 2000 14 p paper The determination of the hydrogen adsorption capacity on different industrial surfaces has been carried out by measuring isothermal adsorption. First results show that the adsorption capacity is mainly determined by surface porosity. Therefore, the samples may be classified in two categories: smooth surfaces and porous surfaces. Thermal desorption spectra reveal two adsorption energy levels for hydrogen physisorbed on porous materials, but only a single one on smooth samples. The value of the lowest energy level seems to be independent on the substrate nature. The physisorption process studied at low coverage, well below a monolayer, shows that these two levels are not well defined but an energy distribution exists for each of them.The influences of the isotherm temperature and an annealing at 7 K of an adsorbed monolayer on hydrogen adsorption capacity have been studied. CERN EDS 20000508SLAC SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable Jenninger, B Saitô, Y LHC CERN-Japan LHC Construction Collaboration CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-375 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-375 Access to fulltext document http://cds.cern.ch/record/434210/files/lhc-project-report-375.pdf Access to fulltext document http://cds.cern.ch/record/434210/files/lhc-project-report-375.ps.gz Access to fulltext document evelyne.delucinge@cern.ch CERN KEK, Tsukuba, Japan n 200019 11 20100401 2001 CER01 20000412 411184 villeurbanne991207 PUBLIC 002183783CER PREPRINT ConferencePaper 0001 432236 SzGeCERN 20230531152024.0 oai:cds.cern.ch:432236 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN 10.1016/S0042-207X(00)00392-4 DOI CERCER 2181730 INSPEC 6825502 CERN annual report 2001-3.1090 SPIRES 4410130 Inspire 529149 LHC-Project-Report-373 eng CERN-LHC-Project-Report-373 Anashin, V V Magnetic and Electric Field Effects on the Photoelectron Emission from Prototype LHC Beam Screen Material 2001 Geneva CERN 15 Mar 2000 9 p paper This paper describes experimental studies of the effect of a dipole field on the photoelectron emission and on the photon reflectivities from LHC beam screen material. These studies were performed using synchrotron radiation from the VEPP-2M storage ring at BINP (Novosibirsk). The particular surface roughness and geometry of the prototype LHC beam screen material requires dedicated experimental measurements. The experiments were performed under conditions close to those expected in the LHC. An important result obtained is that a dipole magnetic field attenuates the photoelectron emission from surface by more than two orders of magnitude with the magnetic field aligned parallel to the surface. The measurements of photon reflectivities, forward scattered and diffuse, and the azimuthal distribution of emitted photoelectrons from the same material are reported. These experimental results are important input for the final design of the LHC beam screen. CERN EDS 20000331SLAC SIS INSP2001 6825502 SIS:2001 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Collins, I R Dostovalov, R V Fedorov, N V Gröbner, Oswald Krasnov, A A Malyshev, O B Pyata, E E LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-373 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-373 Access to fulltext document http://cds.cern.ch/record/432236/files/lhc-project-report-373.pdf Access to fulltext document http://cds.cern.ch/record/432236/files/lhc-project-report-373.ps.gz Access to fulltext document evelyne.delucinge@cern.ch CERN Budker Inst. Nucl. Phys. Novosibirsk n 200013 a2001 13 20100723 1345 CER01 20000327 411184 255-60 villeurbanne991207 PUBLIC 0001 002181730CER ARTICLE ConferencePaper 432235 SzGeCERN 20230531152023.0 oai:cds.cern.ch:432235 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERCER 2181729 SPIRES 4410122 Inspire 529148 LHC-Project-Report-372 eng CERN-LHC-Project-Report-372 Anashin, V V Photon Stimulated Desorption and the Effect of Cracking of Condensed Molecules in a Cryogenic Vacuum System 2000 Geneva CERN 15 Mar 2000 15 p paper The design of the Large Hadron Collider (LHC) vacuum system requires a complete understanding of all processes which may affect the residual gas density in the cold bore of the 1.9 K cryomagnets. A wealth of data has been obtained which may be used to predict the residual gas density inside a cold vacuum system exposed to synchrotron radiation. In this study the effect of cracking of cryosorbed molecules by synchrotron radiation photons has been included. Cracking of the molecular species CO2 and CH4 has been observed in recent studies and these findings have been incorporated in a more detailed dynamic gas density model for the LHC. In this paper, we describe the relevant physical processes and the parameters required for a full evaluation. It is shown that the dominant gas species in the LHC vacuum system with its beam screen are H2 and CO. The important result of this study is that while the surface coverage of cryosorbed CH4 and CO2 molecules is limited due to cracking, the coverage of H2 and CO molecules may increase steadily during the long term operation of the machine. CERN EDS 20000330SLAC SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable Collins, I R Gröbner, Oswald Malyshev, O B LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-372 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-372 Access to fulltext document http://cds.cern.ch/record/432235/files/lhc-project-report-372.pdf Access to fulltext document http://cds.cern.ch/record/432235/files/lhc-project-report-372.ps.gz Access to fulltext document evelyne.delucinge@cern.ch CERN INP, Novosibirsk, Russia n 200013 11 20100723 1334 CER01 20000327 411184 villeurbanne991207 PUBLIC 002181729CER PREPRINT ConferencePaper 0001