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2.
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Vacuum Characterization of a Woven Carbon Fiber Cryosorber in Presence of $H_2$
/ Baglin, V ; Dupont, H ; Garcin, T
Some of the cold bores of the Large Hadron Collider (LHC) will operate at 4.5K. In these elements, the desorbed H2 pressure will rapidly reach the saturated vapour pressure, 3 orders of magnitude larger than the design pressure. [...]
LHC-Project-Report-744; CERN-LHC-Project-Report-744.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1603
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3.
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The Design of Cold to Warm Transitions of the LHC
/ Knaster, J R (CERN) ; Jenninger, B ; Ramos, D ; Ratcliffe, G ; Veness, R J M
The Large Hadron Collider (LHC), the next accelerator being constructed on the CERN site, will accelerate and collide 7 TeV protons and heavier ions up to lead. More than 1700 cryomagnets working at 1.9 or 4.5 k will form part of the magnetic lattice of the LHC. [...]
LHC-Project-Report-743; CERN-LHC-Project-Report-743.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1624
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5.
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Beam-Loss Induced Pressure Rise of LHC Collimator Materials Irradiated with 158 GeV/u $In^{49+}$ Ions at the CERN SPS
/ Mahner, Edgar ; Efthymiopoulos, Ilias ; Hansen, Jan ; Page, Eric ; Vincke, Helmut H
During heavy ion operation, large pressure rises, up to a few orders of magnitude, were observed at CERN, GSI, and BNL. The dynamic pressure rises were triggered by lost beam ions that impacted onto the vacuum chamber walls and desorbed about 1044 to 107 molecules per ion. [...]
LHC-Project-Report-741; CERN-LHC-Project-Report-798.-
2004 - 4 p.
APS Published version, local copy: PDF; Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1633
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6.
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Cold Beam Vacuum Interconnects for the LHC Insertion Regions
/ Ramos, D ; Chauville, D ; Knaster, J R (CERN) ; Veness, R J M
The LHC machine is composed of arcs and insertion regions where superconducting magnets, working at temperatures of 1.9 K and 4.5 K, have flexibly interconnected beam vacuum chambers. These interconnects must respect strict requirements in terms of impedance, aperture, space optimization and reliability. [...]
LHC-Project-Report-740; CERN-LHC-Project-Report-740.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.599
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7.
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LHC Dipole Axis, Spool Piece Alignment and Field Angle in Warm and Cold Conditions
/ Coccoli, M ; Buzio, M ; García-Pérez, J
The installation and commissioning of LHC requires knowledge of the magnetic alignment of the spool piece correctors mounted on the dipole end plates are, as well as of the dipole main field direction. The installation is based on the use of geometric information derived from mechanical measurements performed in warm conditions, assuming that geometric and magnetic axes coincide, and that thermal contractions of the assembly are homothetic. [...]
LHC-Project-Report-739; CERN-LHC-Project-Report-739.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1618
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8.
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Magnetic Field Tracking Experiments for LHC
/ Granata, V ; Billan, J ; Bordry, Frederick ; Bottura, L ; Coutinho-Ferreira, P M ; Effinger, E ; Fernqvist, G ; Galbraith, P ; King, Q ; Pett, John G et al.
At the Large Hadron Collider (LHC) at CERN one of the difficult requirements during the energy ramp is that the ratio between the field produced by the quadrupoles and the field in the dipoles remains constant in order to minimize the variation of the betatron tune that could induce particle loss. With a series of tracking experiments it has been demonstrated that this ratio can be maintained constant to better than 10-4 throughout the same current ramp as foreseen for the LHC. [...]
LHC-Project-Report-738; CERN-LHC-Project-Report-738.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1621
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9.
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A Strategy for Sampling the Field Quality of the LHC Dipoles
/ Bottura, L ; Granata, V ; Fartoukh, Stéphane David ; Todesco, Ezio
We have measured the magnetic field of a large fraction of the LHC main dipoles, to date more than 400 in warm conditions and over 100 in cold conditions. Using the available data we analysed the distributions of the main field and higher order field errors in warm and cold conditions, as well as the distribution of the warm-to-cold correlation. [...]
LHC-Project-Report-737; CERN-LHC-Project-Report-737.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1606
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10.
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Testing of the LHC Magnets in Cryogenic Conditions: Current Experience and Near Future Outlook
/ Chohan, V ; Buzio, M ; de Rijk, G ; Miles, J ; Pugnat, P ; Remondino, Vittorio ; Sanfilippo, S ; Siemko, A ; Smirnov, N ; Vullierme, B et al.
For the Large Hadron Collider under construction at CERN, a necessary and primordial condition prior to its installation is that all the main twin-aperture dipole and quadrupole magnets are tested in the 1.9 K cryogenic conditions. These tests are not feasible at the manufacturers and hence, are carried out at CERN at a purpose built facility on the site. [...]
LHC-Project-Report-736; CERN-LHC-Project-Report-736.-
Geneva : CERN, 2004 - 3 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.560
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11.
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Performance of the Superconducting Matching Quadrupoles for the LHC Insertions
/ Catalan-Lasheras, N ; Kirby, G A ; Ostojic, R ; Pérez, J C ; Prin, H ; Venturini-Delsolaro, W
The optics flexibility of the LHC insertions is provided by the individually powered superconducting quadrupoles in the dispersion suppressors and matching sections. These cryo-magnets comprise special quadrupoles of the MQM and MQY type, and range in length from 5.4 m to 11.4 m. [...]
LHC-Project-Report-735; CERN-LHC-Project-Report-735.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF;
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1615
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12.
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Field Quality and Hysteresis of LHC Superconducting Corrector Magnets
/ Allitt, M ; Bagre, M ; Giloux, C ; Karppinen, M ; Khare, P ; Lombardi, A M ; Maurya, T ; Puntambekar, A ; Remondino, Vittorio ; Santrich-Badal, A et al.
The Large Hadron Collider (LHC) will use some 7600 superconducting corrector magnets. The magnetic field quality is measured at room temperature by 12 magnetic measurement benches employed by the corrector manufacturers. [...]
LHC-Project-Report-734; CERN-LHC-Project-Report-734.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1600
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13.
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Design of an Automatic System for the Electrical Quality Assurance during the Assembly of the Electrical Circuits of the LHC
/ Bozzini, D ; Chareyre, V ; Jacob, A ; Mess, K H ; Russenschuck, Stephan ; Solaz-Cerdan, R
A method has been developed to verify automatically in the LHC tunnel the correct wiring of the 1712 circuits with about 70000 splices for the powering of all-together 10094 magnet units in the LHC machine. The test equipment first detects the continuity of a part of the electrical circuit and then verifies the polarity and type of the magnets connected in the circuit. [...]
LHC-Project-Report-733; CERN-LHC-Project-Report-733.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1612
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14.
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Instrumental Uncertainty in Measuring the Geometry of the LHC Main Dipoles
/ Gubello, G ; La China, M ; Scandale, Walter
In the Large Hadron Collider 1232 superconducting dipoles will bend the two 7 TeV energy beams along a 27 km-long circular trajectory. The series production (assigned to three European firms) requires a well-defined procedure to check, in every magnet, the respect of the dimensional specifications. [...]
LHC-Project-Report-732; CERN-LHC-Project-Report-732.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1627
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15.
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The 5 T Superconducting Undulator for the LHC Synchrotron Radiation Profile Monitor
/ MacCaferri, R ; Facchini, M ; Jung, R ; Tommasini, D ; Venturini-Delsolaro, W
A synchrotron radiation profile monitor will be used in the LHC to measure the beam profiles from the injection energy of 450 GeV to the nominal energy of 7 TeV. The radiation will be provided by a sequence of two separate magnets: a two-periods superconducting undulator and the beam separation dipole D3. [...]
LHC-Project-Report-731; CERN-LHC-Project-Report-731.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1630
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17.
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The Geometry of the LHC Main Dipole
/ Wildner, E ; Beauquis, J ; Gubello, G ; La China, M ; Scandale, Walter
The main lines of discussion and analysis for the LHC dipole geometry are related to the shape of the cold mass at different stages of production and tests. The limitations in the stability of the cold mass shape induces constraints for the positioning of the spool pieces (feed down effects), for the flanges (interconnectivity) and the overall shape (aperture considerations). [...]
LHC-Project-Report-729; CERN-LHC-Project-Report-729.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1648
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18.
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Design and Fabrication of Superfluid Heat Exchanger Tubes for the LHC Superconducting Magnets
/ Bertinelli, F ; Boter, E ; Favre, G ; Ferreira, L M A ; Rossi, L ; Savary, F
The dipole and quadrupole cold masses of the LHC machine require about 1 700 heat exchanger tubes (HET). In operation the HET carries a two-phase flow of superfluid helium at sub-atmospheric pressure. [...]
LHC-Project-Report-728; CERN-LHC-Project-Report-728.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1837
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20.
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Structural Analysis of an Integrated Model of Short Straight Section, Service Module, Jumper Connection and Magnet Interconnects for the Large Hadron Collider
/ Dutta, S ; Dwivedi, J ; Kumar, A ; Skoczen, B ; Soni, H C
The Short Straight Section (SSS) of the Large Hadron Collider (LHC) may undergo relative displacements between cold-mass and cryostat for the following three reasons: - Fabrication tolerance of interconnection bellows - Global smoothing after pre-alignment - Ground motion in a sector of the LHC tunnel The forces responsible for such displacements stem from finite stiffness of interconnect bellows & metal hoses of the internal piping of the jumper connection and from relatively flexible 'glass fibre reinforced epoxy' (GFRE) composite supports of the cold mass. In addition, the vacuum jacket of the jumper connection and the large sleeves attached to both ends of SSS produce elastic deformations of the cryostat vessel. [...]
LHC-Project-Report-726; CERN-LHC-Project-Report-726.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1684
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21.
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The Alignment Jacks of the LHC Cryomagnets
/ Dwivedi, J ; Kumar, A ; Goswami, S G ; Madhumurthy, V ; Parma, V ; Soni, H C
The precise alignment of the 1232 dipoles, 474 Short Straight Sections (SSS) and some other components of the LHC collider, requires the use of 6800 jacks. The specific requirements and the need for a cost-effective solution for this large production, justified the development and industrialisation of a dedicated mechanical jack. [...]
LHC-Project-Report-725; CERN-LHC-Project-Report-725.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1687
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22.
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Electro-Mechanial Aspects of the Interconnection of the LHC Superconducting Corrector Magnets
/ Tock, J P ; Bozzini, D ; Laurent, F ; Russenschuck, Stephan ; Skoczen, B
In addition to the main 1232 bending dipoles and 474 focusing and defocusing quadrupoles, more than 6800 superconducting corrector magnets are included in the LHC machine. They are housed in the superfluid helium enclosures of the main cryomagnets. [...]
LHC-Project-Report-724; CERN-LHC-Project-Report-724.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1645
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24.
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A Scaling Law for Predicting Snap-Back in Superconducting Accelerator Magnets
/ Bottura, L ; Pieloni, T ; Sanfilippo, S ; Ambrosio, G ; Bauer, P ; Haverkamp, M
The decay and snap-back of sextupole in the bending dipoles are issues of common concern, albeit at different levels of criticality, for all superconducting colliders built (Tevatron, HERA, RHIC) or in construction (LHC) to date. The main difficulty is the correction of the relatively large and fast sextupole change during snap-back. [...]
CERN-AT-2004-016-MTM.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1609
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