Report of the Task Force on the Incident of 19th September 2008 at the LHC (2009)
Bajko, M, Bertinelli, F, Catalan-Lasheras, N, Claudet, S, Cruikshank, P, Dahlerup-Petersen, K, ...
This report summarizes the findings and recommendations of the AT department Task Force established to investigate the 19th September 2008 incident which occurred in sector 3-4 of the LHC. It...
Description of the Main Features of the Series Production of the LHC Main Dipole Magnets (2008)
Savary, F, Bajko, M, Chevret, P, De Rijk, G, Fessia, P, Liénard, P, ...
The series production of the LHC main dipole magnets was completed in November 2006. This paper presents the organization implemented at CERN and the milestones fixed to fullfil the technical...
Final Geometry of the 1232 LHC Dipoles (2008)
Wildner, E, Bajko, M, Bestmann, P, Fartoukh, S, Jeanneret, JB, Missiaen, D, ...
The 15 m long main dipoles for the Large Hadron Collider have now been installed in their final positions in the accelerator tunnel. Geometric measurements of the magnets after many of the production...
Status Report on the Superconducting Dipole Magnet Production for the LHC (2007)
Bajko, M, Bertinelli, F, Bellesia, B, Fessia, P, Hagen, P, Koutchouk, Jean-Pierre, ...
In August 2006, about 95 % of the production of the 1232 LHC superconducting dipole cold masses, whose coils are wound with Cu/Nb-Ti cables, is completed. One of the 3 manufacturers, having produced...
Savary, F, Bajko, M, Beauquis, J, Emelianenko, N, Fessia, P, Hagen, P, ...
The LHC accelerator, under construction at CERN, is characterized by the use on a large scale of high field superconducting dipoles: the 27-km ring requires 1232 15-m long dipole magnets designed for...
Electrical Integrity Tests during Production of the LHC Dipoles (2006)
DeRijk, G, Bajko, M, Cornelis, M, Fessia, P, Miles, J, Modena, M, ...
For the LHC dipoles, mandatory electrical integrity tests are performed to qualify the cold mass (CM) at four production stages: individual pole, collared coil, CM before end cover welding and final...
LHC Superconducting Dipole Production Follow-up: Results of Audit on QA Aspects in Industry (2006)
Modena, M, Bajko, M, Cornelis, M, Fessia, P, Liénard, P, Miles, J, ...
The manufacturing of the 1232 Superconducting Main Dipoles for LHC is under way at three European Contractors: Alstom-Jeumont (Consortium), Ansaldo Superconduttori Genova and Babcock Noell Nuclear....
The LHC Dipole Geometry as Built in Industry (2006)
Bajko, M, Chamizo, R, Charrondiere, C, Kuzmin, A, Savary, F
The LHC dipoles magnets are produced in 5 industrial production sites in Europe. The production is well underway and more than half of the total quantity has been delivered to CERN. One of the...
Status Report on the LHC Main Magnet Production (2005)
De Rijk, G, Bajko, M, Cornelis, M, Durante, M, Fessia, P, Miles, J, ...
The LHC ring will contain 1232 main dipole and 382 main quadrupole twin aperture magnets. All main magnets are superconducting and employ NbTi/Cu Rutherford type cables operated at 1.9 K. The dipole...
The LHC Pre-series Dipole Cold Mass Geometry (2004)
Bajko, M, Chamizo, R, Savary, F, Skoczen, B, Veness, R J M, Jeanneret, J B
In order to provide the necessary mechanical aperture for the LHC beam, the main dipole cold masses have to match precisely the nominal circular trajectory of the particles beam. The requirements on...
Magnetic Axis and Geometric Measurement for the LHC Cryomagnet (2003)
Bajko, M, Charrondière, C, García-Pérez, J, Gorskaya, E A, Koltin, G, Rijllart, A
The LHC cryomagnets are made with several types of magnets which all need to be aligned. Both magnetic and geometric axis need to be well known before the installation in the LHC tunnel. These...
Status of the LHC Main Dipole Pre-Series Production (2003)
Modena, M, Bajko, M, Cornelis, M, Fessia, P, Miles, J, Pugnat, P, ...
The procurement of a pre-series of 90 main dipoles was decided as the first step towards the series production of 1232 arc main dipoles within the LHC magnet program. The pre-series production is...
Bajko, M, Chamizo, R, Pardons, A
In order to predict the mechanical behavior of the LHC dipole cold mass in situations such as handling, transport and cool down, a number of important structural parameters are required. The dipole's...
Modena, M, Bajko, M, Bottura, L, Buzio, M, Fessia, P, Pagano, O, ...
The LHC, a 7 TeV proton collider presently under construction at CERN, requires 1232 superconducting dipole magnets, featuring a nominal field of 8.33 T inside a cold bore tube of 50 mm inner...
Geometric and Magnetic Axes of the LHC Dipole (2001)
Bajko, M, Billan, J, Buzio, M, Deferne, G, Ferracin, P, García-Pérez, J, ...
The 15-m long superconducting dipoles of the Large Hadron Collider (LHC) with two-in-one design are curved by about 5 mrad to follow the beam trajectory. They are supported on three cold feet to...
Geometry and Alignment Requirements for the LHC Main Dipole (2000)
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...
Manufacture and Performance of the LHC Main Dipole Final Prototypes (2000)
Modena, M, Artoos, K, Bajko, M, Bottura, L, Buzio, M, Fessia, P, ...
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...
FEM Computations Concerning the Effect of Friction in Two LHC Main Dipole Structures (1999)
Bajko, M, Fessia, P, Perini, D
The mechanical behaviour of a dipole structure is considered when also friction is taken into account, studying its effect on different components and in different conditions. In particular the...
Further Development of the Sextupole Dipole Corrector (MSCB) Magnet for the LHC (1999)
Ang, Z, Arshad, S A, Bajko, M, Bottura, L, Coxill, D, Giloux, C, ...
Combined sextupole-dipole corrector magnets (MSCB) will be mounted in each half cell of the new Large Hadron Collider (LHC) being built at CERN. The dipole part, used for particle orbit corrections,...
Statistical Studies of the Robustness of the LHC Main Dipole Mechanical Structure (1999)
Bajko, M, Fessia, P, Perini, D
This paper describes two methods used to study the effect of the tolerances of the components on the structure of the LHC main dipole. The first method, called semi-statistical, is useful for the...
Artoos, K, Bottura, L, Fessia, P, Bajko, M, Modena, M, Pagano, O, ...
This paper reports about the program of six LHC superconducting main dipole final prototypes and the steps towards series manufacture. The above program, launched in summer 1998, relies on collared...
Training Tests on Single Superconducting Coils of Sextupolar Correctors for LHC (1999)
Bajko, M, Ijspeert, Albert, Pérez, J C, García-Tabarés, L, Calero, J, Toral, F
The precompression of the coils is considered to be one of the most important parameters to achieve good training performance in a superconducting magnet. In order to better understand and optimise...
Training Study on Superconducting Coils of the LHC Sextupole Corrector Magnet (1998)
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...