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1.
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Beam-Induced Electron Cloud in the LHC and Possible Remedies
/ Baglin, V ; Brüning, Oliver Sim ; Calder, R ; Caspers, Friedhelm ; Collins, I R ; Gröbner, Oswald ; Hilleret, Noël (CERN) ; Laurent, Jean Michel ; Morvillo, M ; Pivi, M et al.
Synchrotron radiation from proton bunches in the LHC creates photoelectrons at the beam screen wall. These photoelectrons are accelerated towards the positively charged proton bunch and drift across t he beam pipe between successive bunches.When they hit the opposite wall, they generate secondary electrons which can in turn be accelerated by the next bunch if they are slow enough to survive. [...]
LHC-Project-Report-188; CERN-LHC-Project-Report-188.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.359-361
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2.
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Measurements of the LHC Corrector Magnets at Room and Cryogenic Temperatures
/ Ang, Z ; Arn, A ; Bottura, L ; Giloux, C ; Sievers, P ; Smirnov, N ; Vincent, S ; Walckiers, L
The superconducting twin aperture main dipole magnets of the LHC accelerator are equipped with pairs of sextupole and decapole correctors at their ends. Similarly, octupole correctors are aligned at t he end of the main quadrupole magnets. [...]
LHC-Project-Report-201; CERN-LHC-Project-Report-201.-
Geneva : CERN, 1998 - 4 p.
Fulltext: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2044-2046
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3.
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Multipacting Tests with Magnetic Field for the LHC Beam Screen
/ Brüning, Oliver Sim ; Caspers, Friedhelm ; Laurent, Jean Michel ; Morvillo, M ; Ruggiero, F
In connection with electron-cloud induced heating of the LHC beam screen, multipacting tests with a resonant coaxial cavity have been successfully performed in presence of a solenoid and a dipole magn etic field. We have developed a simple and reliable technique, based on amplitude modulation of the input signal, to detect electronically the onset of multipacting and to monitor the field and power level in the resonator. [...]
LHC-Project-Report-187; CERN-LHC-Project-Report-187.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.356-358
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4.
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Mechanical and Vacuum Stability Design Criteria for the LHC Experimental Vacuum Chambers
/ Collins, I R ; Gröbner, Oswald ; Lepeule, P ; Veness, R J M
Four colliding beam experiments are planned for the Large Hadron Collider (LHC) requiring experimental vacuum chambers in the interaction region. The beam pipe should be as transparent as possible to scattered particles and detectors should be as close as possible to the interaction point, resulting in small diameter beam pipes. [...]
LHC-Project-Report-205; CERN-LHC-Project-Report-205.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2202-2204
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6.
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Development and Test Results of a low-$\beta$ Quadrupole Model for the Large Hadron Collider
/ Ajima, Y ; Burkhardt, E E ; Doi, Y ; Haruyama, T ; Higashi, N ; Iida, M ; Kawamata, H ; Kimura, N ; Makida, Y ; Nakamoto, T et al.
A 1-m model of the high gradient 70 mm aperture superconducting low-b quadrupoles for the Large Hadron Collider (LHC) has been developed. A field gradient of 250 T/m at 1.9 K has been achieved with a peak field of 10 T in the coil. [...]
LHC-Project-Report-271; CERN-LHC-Project-Report-271; KEK-98-114.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF; External link: Fulltext
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2047-2049
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8.
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ROXIE : A Computer Code for the Integrated Design of Accelerator Magnets
/ Russenschuck, Stephan
The paper describes the ROXIE software program package which has been developed for the design of the superconducting magnets for the LHC at CERN. The software is used as an approach towards the integrated design of superconducting magnets including feature-based coil geometry creation, conceptual design using genetic algorithms, optimization of the coil and iron cross-sections using a reduced vector-potential formulation, 3-D coil end geometry and field optimization using deterministic vector-optimization techniques, tolerance analysis, production of drawings by means of a DXF interface, end-spacer design with interfaces to CAD-CAM for the CNC machining of these pieces, and the tracing of manufacturing errors using field quality measurements..
LHC-Project-Report-276; CERN-LHC-Project-Report-276.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2017-2019
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10.
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Performance of the 1-meter models of the 70 mm aperture quadrupole for the LHC low-beta insertions
/ Bottura, L ; Giloux, C ; Kirby, G A ; Lamm, M J ; Milward, S R ; Ostojic, R ; Rival, F ; Rodríguez-Mateos, F ; Schloss, S ; Siemko, A et al.
Following the successful testing of the first 1-metre model of the 70 mm aperture quadrupole for the LHC low-beta insertions, two further 1-metre magnets have been built. All magnets feature a four-layer coil wound from two 8.2 mm wide graded NbTi cables and a four-way split yoke supporting structure. [...]
LHC-Project-Report-240; CERN-LHC-Project-Report-240.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2011-2013
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11.
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Testing of the large bore single aperture 1-meter superconducting dipoles made with phenolic inserts
/ Boschmann, H ; Bottura, L ; Dubbeldam, R L ; Kirby, G A ; Lucas, J ; Ostojic, R ; Russenschuck, Stephan ; Siemko, A ; Taylor, T M ; Vanenkov, I et al.
Two identical single aperture 1-metre superconducting dipoles have been built in collaboration with HMA Power Systems and tested at CERN. The 87.8 mm aperture magnets feature a single layer coil wound using LHC main dipole outer layer cable, phenolic spacer type collars, and a keyed two part structural iron yoke. [...]
LHC-Project-Report-238; CERN-LHC-Project-Report-238.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2008-2010
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14.
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Field-shape imperfections of the CERN-LHC dipole arising from mechanical deformations and component tolerances
/ Scandale, Walter ; Bartolini, R ; Ferracin, P ; Fessia, P ; Todesco, Ezio
The stability of the geometry of the superconducting coils is essential to the field homogeneity of the LHC dipole magnets. Mechanical stresses during coil assembly, thermal stresses during cool-down and electromagnetic stresses during operation are the source of deformations of the coil geometry. [...]
LHC-Project-Report-225; CERN-LHC-Project-Report-225.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2023-2025
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15.
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Manufacturing features and performances of long models and first prototype for the LHC project
/ Billan, J ; Bóna, M ; Bottura, L ; Pagano, O ; Perin, R ; Perinet-Marquet, J L ; Perini, D ; Rossi, L ; Savary, F ; Spigo, G et al.
This paper reports about the 10-m-long models and one 15-m-long prototype. Their main design features are a 5-block coil cross section, an intra-beam distance of 194 mm at room temperature and a 15-mm-wide superconducting cable. [...]
LHC-Project-Report-224; CERN-LHC-Project-Report-224.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.2041-2043
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16.
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Magnetic Performance of First low-$\beta$ dipole corrector prototype, MCBX
/ Ang, Z ; Bottura, L ; Ijspeert, Albert ; Hauge, N ; Karppinen, M ; Nielsen, B R ; Walckiers, L
The LHC low-beta triplets require a short and strong dipole corrector. The MCBX is a superconducting single aperture magnet, which features a horizontal dipole nested inside a vertical dipole. [...]
LHC-Project-Report-237; CERN-LHC-Project-Report-237.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PS.GZ;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.1996-1998
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17.
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Training Study on Superconducting Coils of the LHC Sextupole Corrector Magnet
/ Bajko, M ; Calero, J ; García-Tabarés, L ; Ijspeert, Albert ; Pérez, J C ; Toral, F
A study on a single sextupole coil, working under the same conditions as the full magnet, has been made to evaluate the effect of the azimuthal pre-compression and the longitudinal pre-tension on the training of superconducting coils. A testing device has been used that allows to test individual sextupole type coils in a cryostat at 4.2 K by exerting variable pre-stresses in situ. [...]
LHC-Project-Report-236; CERN-LHC-Project-Report-236.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.1984-1986
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18.
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State of the Short Dipole Model Program for the LHC
/ Andreyev, N I ; Artoos, K ; Kurtyka, T ; Oberli, L R ; Perini, D ; Russenschuck, Stephan ; Siegel, N ; Siemko, A ; Tommasini, D ; Vanenkov, I et al.
Superconducting single and twin aperture 1-m long dipole magnets are currently being fabricated at CERN at a rate of about one per month in the framework of the short dipole model program for the LHC. The program allows to study performance improvements coming from refinements in design, components and assembly options and to accumulate statistics based on a small-scale production. [...]
LHC-Project-Report-223; CERN-LHC-Project-Report-223.-
Geneva : CERN, 1998 - 4 p.
Access to fulltext document: PDF; External links: Abstract from JACoW; Published version from JACoW
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.311-313
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19.
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Experience with the LEP vacuum system at energies above 90 GeV and future expectations
/ Billy, J C ; Bojon, J P ; Hilleret, Noël (CERN) ; Jiménez, M ; Laugier, I
The LEP storage ring has been operated at energies above 90 GeV for more than 1000 hours during 1997. Because of the rapid increase with the beam energy of the power radiated as synchrotron light, the vacuum system has been submitted to very stringent conditions as far as power evacuation and photon stimulated gas desorption are concerned. [...]
CERN-LHC-98-004-VAC.-
Geneva : CERN, 1998 - 4 p.
Report
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.314-316
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