1.
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Geometry and Alignment Requirements for the LHC Main Dipole
/ Scandale, Walter ; Bajko, M ; Savary, F
The 15 m long LHC superconducting dipole magnets, which contain two beam channels in a common mechanical structure, produce a magnetic field of 8.3 T required to deflect protons with 7 TeV/c momentum along a circular trajectory in the already existing LEP tunnel. The dipoles are bent in their horizontal plane to provide the largest possible mechanical aperture to the circulating beam. [...]
LHC-Project-Report-426; CERN-LHC-Project-Report-426.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2160
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4.
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First Results from COLDEX Applicable to the LHC Cryogenic Vacuum System
/ Baglin, V ; Collins, I R ; Grünhagel, C ; Gröbner, Oswald ; Jenninger, B
A cold bore experiment (COLDEX) has been installed in the electron-positron accumulator (EPA) at CERN. The ~2 m long COLDEX cryostat, that may be cooled to below 3 K, is fitted with an actively cooled perforated beam screen to simulate the conditions in the cold arcs of the LHC. [...]
LHC-Project-Report-435; CERN-LHC-Project-Report-435.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2283
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5.
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Electron Cloud : Observations with LHC-Type Beams in the SPS
/ Arduini, Gianluigi ; Cornelis, Karel ; Gröbner, Oswald ; Hilleret, Noël (CERN) ; Höfle, Wolfgang ; Jiménez, J M ; Laurent, Jean Michel ; Moulard, G ; Pivi, M ; Weiss, K P
In August 1999, strong pressure increases were observed in the SPS in the presence of the new LHC-type beams. This paper reports on observations of the electron cloud phenomenon and the related pressure increase as a function of parameters such as the number of protons per bunch, the number of bunches per batch, the shape of the vacuum chamber and the electron current collected on pick-ups. [...]
LHC-Project-Report-434; CERN-LHC-Project-Report-434.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 939
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6.
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The Secondary Electron Yield of Technical Materials and its Variation with Surface Treatments
/ Baglin, V ; Bojko, J ; Gröbner, Oswald ; Henrist, Bernard ; Hilleret, Noël (CERN) ; Scheuerlein, C ; Taborelli, M
Secondary electron emission of surfaces exposed to oscillating electromagnetic field is at the origin of the multipacting effect that could severely perturb the operation of particle accelerators. This contribution tries to illustrate by measurement results, the origin of the secondary electron emission as well as the main reasons for the discrepancies between technical materials and pure metals. [...]
LHC-Project-Report-433; CERN-LHC-Project-Report-433.-
Geneva : CERN, 2000 - 6 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 217
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8.
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Sensitivity and Accuracy of the Systems for the Magnetic Measurements of the LHC Magnets at CERN
/ Bottura, L ; Buzio, M ; Schnizer, P ; Smirnov, N ; Walckiers, L
Beam optics of the LHC accelerator require stringent control of the field quality of the main dipole and quadrupole magnets. The field quality measurements need challenging accuracy given the small size of the aperture (50 mm) : relative strength of the magnets within 2×10-4, harmonics in the ppm range, axis determination within 0.1 mm, main field direction within 0.2 mrad. [...]
LHC-Project-Report-431; CERN-LHC-Project-Report-431.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2181
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9.
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Manufacture and Performance of the LHC Main Dipole Final Prototypes
/ Modena, M ; Artoos, K ; Bajko, M ; Bottura, L ; Buzio, M ; Fessia, P ; Pagano, O ; Perini, D ; Savary, F ; Scandale, Walter et al.
This paper reports about the program of six LHC main dipole final prototypes. This program, launched in summer 1998, relies on industrially manufactured collared coils and cold masses assembled at the CERN Magnet Assembly Facility. [...]
LHC-Project-Report-430; CERN-LHC-Project-Report-430.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2148
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11.
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Performance of Series-Design Prototype Main Quadrupoles for the LHC
/ Billan, J ; Bottura, L ; Peyrot, M ; Remondino, Vittorio ; Rifflet, J M ; Siemko, A ; Simon, F ; Tortschanoff, Theodor
/CERN-CEA-IN2P3 LHC Construction Collaboration
After the successful construction of two first-generation prototypes of the main quadrupoles for the LHC, three series-design prototypes have been further manufactured at CEA-Saclay. Together with the sextupole-dipole corrector magnets and tuning quadrupoles, these twin-aperture main quadrupoles are assembled into the cold masses of the so-called short straight sections [...]
LHC-Project-Report-428; CERN-LHC-Project-Report-428.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2172
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12.
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Status of the LHC Short Dipole Model Programme
/ Tommasini, D ; Arteche, F ; Sanfilippo, S ; Siemko, A ; Vanenkov, I ; Wyss, C
The 1-m model program for the main LHC dipoles is now mainly focussed on double-aperture magnets. In the past years an intensive program based on single-aperture dipoles allowed to select the series-design features among several variants for the coil cross section, the material of the collars and of the coil end spacers, the coil pre-stress and the cable insulation. [...]
LHC-Project-Report-427; CERN-LHC-Project-Report-427.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2169
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13.
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Analysis of Warm Magnetic Measurements of the First Series-Design Prototypes of the LHC Main Quadrupoles
/ Peyrot, M ; Redaelli, S ; Remondino, Vittorio ; Rifflet, J M ; Scandale, Walter ; Simon, F ; Todesco, Ezio ; Tortschanoff, Theodor
/CERN-CEA-IN2P3 LHC Construction Collaboration
The room temperature magnetic measurements of the first series-design prototypes of the LHC main quadrupoles are analysed. Data relative to the collared coils and to the assembled cold mass are considered. [...]
LHC-Project-Report-425; CERN-LHC-Project-Report-425.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2166
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14.
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Modelization of the Thermo-Mechanical Structure of the LHC Main Dipole and Influence on Field Quality
/ Ferracin, P ; Scandale, Walter ; Todesco, Ezio ; Tropea, P ; Vanenkov, I
The mechanical structure of the main LHC dipole is analysed. A finite element model is used to estimate the loads and the deformations at cryogenic temperature. [...]
LHC-Project-Report-424; CERN-LHC-Project-Report-424.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 330
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15.
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Performance of the 1-m Model of the 6 kA Superconducting Quadrupole for the LHC Insertions
/ Lucas, J ; Bottura, L ; Dariol, H ; Ostojic, R ; Sanfilippo, S ; Siemko, A ; Sonnemann, F ; Tommasini, D ; Vanenkov, I
The LHC dispersion suppressors and matching sections will be equipped with individually powered superconducting quadrupoles with an aperture of 56 mm. In order to minimise the cost of the powering circuits, the quadrupole has been designed on the basis of an 8 mm wide NbTi Rutherford-type cable for a nominal current of 5300 A, corresponding to a gradient of 200 T/m at 1.9 K. [...]
LHC-Project-Report-423; CERN-LHC-Project-Report-423.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2145
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16.
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Overview of the LHC Magnets other than the Main Dipoles
/ Siegel, N
The Large Hadron Collider, due for commissioning in 2005, features a large and complex magnet system that includes about 3000 double aperture magnets and 5000 single aperture ones. Most of these magnets are super-conducting, using conductors made of NbTi alloy, with a coil bore of 56 mm and operating in a static bath of su-perfluid helium at 1.9 K, fully exploiting the conductor limit at these low temperatures. [...]
LHC-Project-Report-422; CERN-LHC-Project-Report-422.-
Geneva : CERN, 2000 - 6 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 23
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17.
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Energy Extraction Resistors for the Main Dipole and Quadrupole Circuits of the LHC
/ Dahlerup-Petersen, K ; Kazmine, B ; Popov, V ; Sytchev, V V ; Vasilev, L B ; Zubko, V G
/CERN-Russia Collaboration
When the LHC will be operating at its maximum beam energy, its superconducting dipole chains store a total magnetic energy of more than 11 GJ. At the same time, the QF and QD quadrupole circuits store a total energy of 400 MJ. [...]
LHC-Project-Report-421; CERN-LHC-Project-Report-421.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2420
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18.
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Application of High Temperature Superconductors to Accelerators
/ Ballarino, A
Since the discovery of high temperature superconductivity, a large effort has been made by the scientific community to investigate this field towards a possible application of the new oxide superconductors to different devices like SMES, magnetic bearings, flywheels energy storage, magnetic shielding, transmission cables, fault current limiters, etc. However, all present day large scale applications using superconductivity in accelerator technology are based on conventional materials operating at liquid helium temperatures. [...]
LHC-Project-Report-420; CERN-LHC-Project-Report-420.-
Geneva : CERN, 2000 - 6 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 227
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19.
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Protection of the Superconducting Corrector Magnets for the LHC
/ Schmidt, R ; Giloux, C ; Hilaire, A ; Ijspeert, Albert ; Rodríguez-Mateos, F ; Sonnemann, F
n the LHC about 6500 superconducting corrector magnets will be powered either in stand-alone mode or in electrical circuits of up to 154 magnets. Single corrector magnets are designed to be self-protected in case of a quench. [...]
LHC-Project-Report-419; CERN-LHC-Project-Report-419.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2163
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20.
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Quench Heater Experiments on the LHC Main Superconducting Magnets
/ Rodríguez-Mateos, F ; Pugnat, P ; Sanfilippo, S ; Schmidt, R ; Siemko, A ; Sonnemann, F
In case of a quench in one of the main dipoles and quadrupoles of CERN's Large Hadron Collider (LHC), the magnet has to be protected against excessive temperatures and high voltages. In order to uniformly distribute the stored magnetic energy in the coils, heater strips installed in the magnet are fired after quench detection. [...]
LHC-Project-Report-418; CERN-LHC-Project-Report-418.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2154
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22.
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The Electrical Distribution Feed Box for the LHC Prototype Cell
/ Hauviller, Claude ; Ivanov, P M ; Poncet, Alain ; Sacré, P ; Trilhe, P
/CERN-Russia Collaboration
The Electrical Distribution Feed Box (DFB) for the Large Hadron Collider (LHC) Prototype Cell (String 2) is a 6 meter-long 4.6 K / 0.135 MPa liquid helium cryostat which supports and cools 13 kA and 600 A High-Temperature Superconductor (HTS) current leads. These are used for powering the String 2 main dipole and quadrupole superconducting magnets, together with their correctors. [...]
LHC-Project-Report-416; CERN-LHC-Project-Report-416.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2217
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24.
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A Virtual CAD Model of the LHC
/ Chemli, S ; Hauviller, Claude ; Messerli, R ; Muttoni, Y ; Prin, H ; Van Uytvinck, E
Integrating the large and complex LHC machine into the existing LEP tunnel is a major challenge. Space was not really a problem to fit the LEP machine into its tunnel, but LHC cryostats are much larger than the LEP quadrupoles and the external cryogenic line fills even more the tunnel. [...]
LHC-Project-Report-414; CERN-LHC-Project-Report-414.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2139
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25.
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Layout and Design of the Auxiliary Bus-Bar Line for the LHC Arc Main Cryostat
/ Kowalczyk, P ; Poncet, Alain ; Skoczen, Blazej
The superconducting multipole magnets housed in the cold mass of the LHC arc short straight sections, together with the arc dispersion suppressor and matching section quadrupole magnets, will be electrically fed along the 3 km arcs via 600 A and 6 kA superconducting flexible cables. These will be routed into a tube running parallel to the cold masses, placed inside their cryostat [1], from power converters located at each of the 16 arc extremities. [...]
LHC-Project-Report-413; CERN-LHC-Project-Report-413.-
Geneva : CERN, 2000 - 4 p.
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2456
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27.
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Application of Bent Crystals at IHEP 70-GeV Accelerator to Enhance the Efficiency of its Usage
/ Kotov, V.I. (Serpukhov, IHEP) ; Afonin, A.G. (Serpukhov, IHEP) ; Biryukov, V.M. (Serpukhov, IHEP) ; Chesnokov, Yu.A. (Serpukhov, IHEP) ; Galyaev, N.A. (Serpukhov, IHEP) ; Gres, V.N. (Serpukhov, IHEP) ; Maisheev, V.A. (Serpukhov, IHEP) ; Medvedev, V.A. (Serpukhov, IHEP) ; Minchenko, A.V. (Serpukhov, IHEP) ; Terekhov, V.I. (Serpukhov, IHEP) et al.
Bent crystal was extracting 70-GeV protons with average intensity 4x10$^{11}$ (as measured in external beamline) per spill of ~1.6 s duration, in parallel to the simultaneous work of two internal targets in the accelerator ring. An additional crystal, placed in the external beamline, was deflecting a small part of the extracted beam with intensity ~10$^7$ protons toward another physics experiment. [...]
hep-ex/0111001; CERN-LHC-2000-007-MMS; CERN-LHC-2000-7; CERN-LHC-2000-07; CERN-LHC-2000-007; CERN-LHC-2000-007-MMS.-
Geneva : CERN, 2000 - 5 p.
Report
- Published in : , pp. 364-366
Access to fulltext document: PDF; Fulltext: PDF; External links: Fulltext; Full-text at JACoW Server
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 364
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28.
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Application of Ferroelectric Cathodes to Enhance the Ion Yield in the Caesar Source at LNS
/ Boscolo, I ; Celona, L ; Cialdi, S ; Ciavola, G ; Cipriani, D ; Gammino, S ; Handerek, J ; Marletta, S ; Riege, H ; Somarè, G et al.
With increasing RF power the electron concentration in the plasma of ECR ion sources is decreasing in comparison to the ion concentration, so that the plasma is charging up positively. Direct injection of electrons into the ECR plasma can increase the electron charge density and the ion current yield. [...]
CERN-LHC-2000-003-DLO.-
Geneva : CERN, 2000 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 1631
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29.
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The LEP Vacuum System : A Summary of 10 Years of Successful Operation
/ Billy, J C ; Bojon, J P ; Gröbner, Oswald ; Hilleret, Noël (CERN) ; Jiménez, M ; Laugier, I ; Strubin, Pierre M
he LEP accelerator is now operating regularly above 100 GeV and its vacuum system is submitted to the impact of energetic photons with a critical energy approaching 1 MeV. The consequences of this high energy on the photon induced desorption will be reviewed in the light of the various photon absorption mechanisms for aluminium. [...]
CERN-LHC-2000-002-VAC.-
Geneva : CERN, 2000 - 4 p.
Report
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2286
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30.
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Experience with the Multi-Year Implementation of an Industrial Control System
/ Kuhn, H K ; Gayet, P ; Juillerat, A C ; Rabany, Michel ; Wollès, J C
In 1990, CERN passed a multi-year purchasing and installation contract for the LEP 200 Cryogenics control system with ABB, one of the world's leading suppliers of integrated Distributed Control Systems (DCS). A financial framework provided over a period of eight years the required supplies. [...]
CERN-LHC-2000-001-IAS.-
Geneva : CERN, 2000 - 4 p.
Report
Access to fulltext document: PDF;
In : 7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 2432
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