Koutchouk, Jean-Pierre, Zimmermann, F
An LHC high-luminosity upgrade has been studied by various European and international collaborations since about 2001. Ingredients of such an LHC upgrade include the optimization of the...
First field test of FiDeL: The magnetic field description for the LHC (2009)
Bottura, L, Buzio, M, Catalan-Lasheras, N, Deniau, L, Di Castro, M, Fartoukh, S, ...
The start-up of the LHC has provided the first field test for the concept, functionality and accuracy of FiDeL, the Field Description for the LHC. FiDeL provides a parametric model of the transfer...
WISE: A Simulation of the LHC Optics including Magnet Geometrical Data (2008)
Hagen, P, Giovannozzi, M, Koutchouk, Jean-Pierre, Risselada, Thys, Schmidt, F, Todesco, E, ...
The beam dynamics in the LHC require a tight control of the field quality and geometry of its magnets. At the EPAC06 we presented the simulation tool WISE which generates magnetic field errors to be...
Energy Deposited in the High Luminosity Inner Triplets of the LHC by Collision Debris (2008)
Wildner, E, Broggi, F, Cerutti, F, Ferrari, A, Hoa, C, Koutchouk, Jean-Pierre, ...
The 14 TeV center of mass proton-proton collisions in the LHC produce not only debris interesting for physics but also showers of particles ending up in the accelerator equipment, in particular in...
Increasing the Integrated Luminosity of SLHC by Luminosity Levelling via the Crossing Angle (2008)
Koutchouk, Jean-Pierre, Ohmi, K, Sterbini, G
With an increase of luminosity by a factor of 10, the luminosity lifetime in an upgraded LHC would decrease from 15 hours to two to four hours, depending on the upgrade strategy. If the luminosity...
Hoa, C, Broggi, F, Cerutti, F, Koutchouk, Jean-Pierre, Sterbini, G, Wildner, E
With a new geometry in a higher luminosity environment, the power deposition in the superconducting magnets becomes a critical aspect to analyze and to integrate in the insertion design. In this...
Koutchouk, Jean-Pierre, Assmann, Ralph Wolfgang, Métral, E, Todesco, E, Zimmermann, F, De Maria, R, ...
A significant reduction of b* requires a new beam crossing scheme to overcome the consequence of the luminosity loss factor. We define in this paper the parameters of a possible solution taking...
Todesco, E, Bellesia, B, Koutchouk, Jean-Pierre, Santoni, C
Random components of field harmonics in superconducting quadrupoles are usually estimated by computing the effect of a random positioning of the coil blocks with an r.m.s. of 0.05 mm. Here, we review...
Space-Charge Compensation Options for the LHC Injector Complex (2007)
Aiba, M, Chanel, M, Dorda, U, Franchetti, G, Garoby, R, Koutchouk, Jean-Pierre, ...
Space-charge effects have been identified as the most serious intensity limitation in the CERN PS and PS Booster, on the way towards ultimate LHC performance and beyond. We here explore the...
Todesco, E, Bellesia, B, Koutchouk, Jean-Pierre
A possible scenario for the luminosity upgrade of the Large Hadron Collider is based on large aperture quadrupoles to lower b* in the interaction regions. Here we analyze the measurements relative to...
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...
A Solution for Phase-one Upgrade of the LHC Low-beta Quadrupoles Based on Nb-Ti (2007)
Koutchouk, Jean-Pierre, Rossi, L, Todesco, E
We discuss the possibilities of upgrading the LHC triplet quadrupoles by significantly increasing their aperture (and length), using the Nb-Ti cable of the main dipoles. The goal of this first phase...
Towards full automation of accelerators through computer control (2007)
Gamble, J, Hémery, J Y, Kemp, D, Keyser, R, Koutchouk, Jean-Pierre, Martucci, P P, ...
Operation of the CERN-ISR for high luminosity (2007)
Fischer, G, O'Hanlon, H, Koutchouk, Jean-Pierre, Lemeilleur, F, Lewis, D, Myers, S, ...
An Early Beam Separation Scheme for the LHC Luminosity Upgrade (2006)
Koutchouk, Jean-Pierre, Sterbini, G
The high nominal luminosity of the LHC requires a large number of bunches spaced by about 7.5 m. To prevent more than one head-on collision in each interaction region, a crossing angle of 0.285 mrad...
WISE: An Adaptative Simulation of the LHC Optics (2006)
Hagen, P, Giovannozzi, Massimo, Koutchouk, Jean-Pierre, Risselada, Thys, Sanfilippo, S, Todesco, E, ...
The beam dynamics in LHC requires a tight control of the field quality and geometry of the magnets. As the production advances, decisions have to be made on the acceptance of possible imperfections....
Investigations of the Parameter Space for the LHC Luminosity Upgrade (2006)
Increasing the LHC luminosity by a factor of ten is a major challenge, especially for the beam-beam long-range interactions and even more for the magnet technology and insertion layout. To help...
Performance of LHC Main Dipoles for Beam Operation (2006)
De Rijk, Gijsbert, Bajko, Marta, Bottura, Luca, Buzio, Marco Carlo Luigi, Chohan, Vinod, Deniau, Laurent, ...
At present about 90% of the main dipoles for the LHC have been manufactured and one of the three cold mass assemblers has already completed the production. 85% of the 1232 dipoles needed for the...
First Computation of Parasitic Fields in LHC Dipole Magnet Interconnects (2006)
Devred, Arnaud, Auchmann, Bernard, Boncompagni, Yann, Ferapontov, V, Koutchouk, Jean-Pierre, Russenschuck, Stephan, ...
The Large Hadron Collider (LHC), now under construction at CERN, will rely on about 1600 main superconducting dipole and quadrupole magnets and over 7400 superconducting corrector magnets distributed...
Results from the SPS 1.7 GHz travelling wave schottky monitor (2005)
Castro, M E, Caspers, F, Kroyer, T, Jones, R, Koutchouk, Jean-Pierre, Tranquille, G
A 1.7 GHz waveguide Schottky detector system was recently built and installed in the SPS accelerator following the design of the detectors of the Fermilab Tevatron and Recycler accelerators. The...
Zimmermann, Frank, Koutchouk, Jean-Pierre, Papaphilippou, Yannis, Roncarolo, Federico, Sen, Tanaji, Shiltsev, Vladimir, ...
Experiments with two prototype long-range beam-beam compensators (current-carrying wires) during the 2004 CERN SPS run explored the efficiency of a proposed long-range beam-beam compensation for the...
Experiments on LHC Long-Range Beam-Beam Compensation in the CERN SPS (2004)
Koutchouk, Jean-Pierre, Wenninger, J, Zimmermann, Frank
Long-range beam-beam collisions may limit the dynamic aperture and the beam lifetime in colliders. Their effect can be compensated by a current-carrying wire mounted parallel to the beam. A...
Zimmermann, Frank, Koutchouk, Jean-Pierre, Wenninger, J
Contributions to the 30th Advanced ICFA Beam Dynamics Workshop on High Luminosity e+e- Collisions " FACTORIES 03", SLAC, Stanford, 13-16 October 2003. Contents: 1.Summary of the Working Group on IR...
Advanced Diagnostics of Lattice Parameters in Hadron Colliders (2003)
With a beam stored energy exceeding by several orders of magnitude the quench level of the magnets and non-negligible non-linear field components, the control of the beam dynamics and losses in LHC...
On-line Monitoring of the Linear Coupling Resonances for the LHC (2003)
Catalan-Lasheras, N, Fartoukh, Stéphane David, Koutchouk, Jean-Pierre
Before correction, the difference coupling coefficient in LHC is expected to reach 0.2 at injection and vary by 30 to 40% from injection to top energy. These high values arise mostly from the field...
The energy calibration of LEP in 1992 (2002)
Arnaudon, L, Assmann, R W, Billan, J, Birr, W, Blondel, A, Bobbink, Gerjan J, ...
Contributions of the SL Division to the Workshop on Beam-beam Effects at Fermilab, June 2001 (2001)
Grote, H, Herr, Werner, Koutchouk, Jean-Pierre, Luo, Y, Schmidt, F, Zimmermann, Frank
This is a compilation of the papers and presentations contributed to the workshop on beam-beam effects, held from 25-28.6 2001 at Fermilab, Batavia, Illinois, USA
Koutchouk, Jean-Pierre, Pilat, F, Ptitsyn, V I
The multipolar content of the dipoles and quadrupoles is known to limit the stability of the beam dynamics in super-conducting machines like RHIC and even more in LHC. The low-beta quadrupoles are...
Correction of the Long-Range Beam-Beam Effect in LHC using Electro-Magnetic Lenses (2001)
The beams in LHC collide head-on in at most four experimental points. Due to the small bunch spacing, the beams experience more than one hundred 'near-misses' on either side of the collision points....
Berrig, O E, Höfle, Wolfgang, Jones, R, Koopman, J, Koutchouk, Jean-Pierre, Schmickler, Hermann, ...
The so-called "AC-Dipole" principle allows the excitation of transverse oscillations to large (several sigma) excursions without emittance blow-up. The idea was originally proposed and tested at BNL...
Chromatic coupling in LHC and its correction (2000)
Fartoukh, Stéphane David, Koutchouk, Jean-Pierre
The geometrical optical aberrations dominate the dynamic aperture in LHC and were therefore much studied. It turned out however that a large second order chromaticity was observed for some possible...
Measurements Of Phase Advance Between Arcs (2000)
Brandt, D, Burkhardt, H, Hofmann, A, Koutchouk, Jean-Pierre, Von Holtey, G
Preliminary Space Requirements For Beam Diagnostics, Correcting Elements And Related Devices (2000)
Borer, J, Hofmann, A, Koutchouk, Jean-Pierre, Placidi, Massimo
LEP Optics Measurements (2000)
Bordry, Frederick, Koutchouk, Jean-Pierre, Piwinski, A, Von Holtey, G
The LHC dynamic aperture (1999)
In 1996, the expected field errors in the dipoles and quadrupoles yielded a long-term dynamic aperture of some 8sigma at injection. The target was set to 12sigma to account for the limitations of our...
Dynamic Effects and their Control at the LHC (1997)
Bailey, R, Bordry, Frederick, Bottura, L, Burla, P, Collier, Paul, Henrichsen, K N, ...
Tune, chromaticity and orbit of the LHC beams have to be precisely controlled by synchronising the magnetic field of quadrupole, sextupole and corrector magnets.This is a challenging task for an...
A more robust and flexible lattice for LHC (1997)
Koutchouk, Jean-Pierre, Faus-Golfe, A, Grote, H, Risselada, Thys, Verdier, A, Weisz, S
To correct more efficiently the arc dispersion, the exact antisymmetry of the LHC optics is now broken, except in the low-b triplets common to the two rings. A new quadrupole is added between the...
Overview of the LHC dynamic aperture studies (1997)
Koutchouk, Jean-Pierre, Böge, M, Faus-Golfe, A, Gareyte, Jacques, Grote, H, Miles, J, ...
The dynamic aperture (D.A.) of the LHC is estimated by tracking a thin-lens model of the lattice over a real machine time of 9 seconds. This raw result is then processed to predict the D.A. over...
Feasibility study for compensating the anharmonicities in LEP with additional octupoles (1997)
Brüning, Oliver Simon, Koutchouk, Jean-Pierre
Operating LEP with the 108/90 optics at the end of the 1996 run indicated a limitation of the dynamic aperture due to a combined effect of non-linear resonances and anharmonicities. This note...
Landau damping dynamic aperture and octupole in LHC (1997)
Gareyte, Jacques, Koutchouk, Jean-Pierre, Ruggiero, F
Maximization of the dynamic aperture and Landau damping of the collective instabilities are partly conflicting requirements. On the one hand, the non-linearities of the lattice must be minimized at...
Modular optical design of the LHC experimental insertions (1996)
Koutchouk, Jean-Pierre, Faus-Golfe, A, Verdier, A, Weisz, S
To optimize the use of space, the LHC insertions combine dispersion matching (arc and ring separation/recombination), beam focalization at the interaction point and betatron phase advance control...
Decoupling of a strongly coupled lattice with an application to LHC (1996)
The systematic skew quadrupole field in the LHC superconducting dipole is estimated to be a2 = 0.310-4 at 1 cm. It causes systematic linear coupling resonances to be strongly excited (width up to 0.2...
The lattice of the CERN Large Hadron Collider (1995)
Scandale, Walter, Jeanneret, J B, Koutchouk, Jean-Pierre, Luo, X, Méot, F, Ostojic, R, ...
The lattice of the CERN Large Hadron Collider is designed with 23 regular cells per arc, each containing 6 tightly packed 14.2 m long dipoles. This allows to reach 7 TeV per beam with a dipole field...
Low emittance lattice for LEP (1995)
Alexakhin, V Yu, Brandt, D, Cornelis, Karel, Hofmann, A, Koutchouk, Jean-Pierre, Meddahi, Malika, ...
In order to obtain the largest luminosity with LEP2, it is attractive to make the beam emittance as small as possible because the beam-beam effect is not a limitation at the energy of E~90 GeV for...
Lepton beam polarization at LEP (1995)
Assmann, R W, Blondel, A, Dehning, Bernd, Drees, A, Grosse-Wiesmann, P, Grote, H, ...
Results from studies on transverse polarization in LEP over the past two years are presented. A single beam transverse polarization level of 57% at 45 GeV was reached adopting strategies to...
The energy calibration of LEP in the 1993 scan (1995)
Assmann, R W, Beuret, A, Blondel, A, Billan, J, Billen, R, Bobbink, Gerjan J, ...
Accurate determination of the LEP beam energy by resonant depolarization (1994)
Arnaudon, L, Assmann, R W, Blondel, A, Dehning, Bernd, Grosse-Wiesmann, P, Jacobsen, R, ...
Recent achievements in transverse spin-polarization at LEP (1994)
Arnaudon, L, Assmann, R W, Blondel, A, Bouchet, B, Camas, J, Dehning, Bernd, ...
Energy calibration with resonant depolarization at LEP in 1993 (1994)
Assmann, R W, Blondel, A, Dehning, Bernd, Grosse-Wiesmann, P, Jacobsen, R, Koutchouk, Jean-Pierre, ...
Deterministic harmonic spin matching in LEP (1994)
Assmann, R W, Blondel, A, Dehning, Bernd, Grosse-Wiesmann, P, Jacobsen, R, Koutchouk, Jean-Pierre, ...
Effects of terrestrial tides on the LEP beam energy (1994)
Arnaudon, L, Assmann, R W, Blondel, A, Dehning, Bernd, Fischer, G E, Grosse-Wiesmann, P, ...
Polarization studies at LEP in 1993 (1994)
Assmann, R W, Blondel, A, Dehning, Bernd, Grosse-Wiesmann, P, Grote, H, Jacobsen, R, ...
Suppression of the main LEP coupling source (1993)
Billan, J, Gourber, J P, Koutchouk, Jean-Pierre, Remondino, Vittorio
Effects of tidal forces on the beam energy in LEP (1993)
Arnaudon, L, Bordry, Frederick, Coosemans, Williame, Dehning, Bernd, Henrichsen, K N, Hofmann, A, ...
Measurement of the mass of the Z boson and the energy calibration of LEP (1993)
Arnaudon, L, Assmann, R W, Billan, J, Birr, W, Blondel, A, Bobbink, Gerjan J, ...
Performance and limitations of the LEP polarimeter (1993)
Assmann, R W, Blondel, A, Dehning, Bernd, Ferri, G, Jacobsen, R, Koutchouk, Jean-Pierre, ...
The energy calibration of LEP in 1991 (1992)
Arnaudon, L, Assmann, R W, Billan, J, Birr, W, Blondel, A, Bobbink, Gerjan J, ...
Energy calibration with a polarized beam at LEP (1992)
Arnaudon, L, Knudsen, L, Koutchouk, Jean-Pierre, Olsen, R, Placidi, Massimo, Schmidt, R, ...
Measurement of LEP beam energy by resonant spin depolarization (1992)
Arnaudon, L, Knudsen, L, Koutchouk, Jean-Pierre, Olsen, R, Placidi, Massimo, Schmidt, R, ...
A study of longitudinal polarization at LEP (1992)
Bovet, Claude, Burkhardt, H, Couchot, F, Föth, H, Grote, H, Von Holtey, G, ...
First observation of tranverse beam polarization in LEP (1991)
Knudsen, L, Koutchouk, Jean-Pierre, Placidi, Massimo, Schmidt, R, Crozon, M, Badier, J, ...
Observation of transverse polarization in LEP (1991)
Badier, J, Blondel, A, Crozon, M, Dehning, Bernd, Knudsen, L, Koutchouk, Jean-Pierre, ...
First evidence of transverse polarization in LEP (1991)
Knudsen, L, Koutchouk, Jean-Pierre, Placidi, Massimo, Schmidt, R, Dehning, Bernd, Badier, J, ...
Compensation of linear betatron coupling in LEP (1990)
Gourber, J P, Guignard, Gilbert, Hofmann, A, Koutchouk, Jean-Pierre, Moshammer, Herbert W
Measurement and compensation of the solenoid effects in LEP (1990)
Guignard, Gilbert, Hand, L, Koutchouk, Jean-Pierre, Moshammer, Herbert W
Implementation of the LEP optics model (1990)
Iselin, F Christoph, Koutchouk, Jean-Pierre, Marti, Y, Poole, John
Orbit processing for LEP (1990)
Brandt, D, Defert, Philippe, Herr, Werner, Koutchouk, Jean-Pierre, Miles, J, Risselada, Thys, ...
LEP optical configurations for injection, acceleration and physics (1990)
Guignard, Gilbert, Koutchouk, Jean-Pierre, Marti, Y, Ruggiero, F, Verdier, A
Measurement of the LEP coupling source (1990)
Billan, J, Brandt, D, Fauchet, A M, Fieguth, T, Gourber, J P, Guignard, Gilbert, ...
Optimization of the LHC lattice and chromaticity (1990)
Koutchouk, Jean-Pierre, Scandale, Walter, Verdier, A, Bassetti, M
Measurements of betatron phase advance and beta function in the ISR (1990)
Borer, J, Hofmann, A, Koutchouk, Jean-Pierre, Risselada, Thys, Zotter, Bruno W
Performance of the CERN ISR at 31.4 GeV (1990)
Fischer, C, Jacquiot, P, Koutchouk, Jean-Pierre, Lemeilleur, F, Lewis, D, Myers, S, ...
Plans for the LEP control system (1990)
Keyser, R, Koutchouk, Jean-Pierre, Pett, John G, Wolstenholme, P
Investigation of the coherent beam-beam effects in the ISR (1990)
Hémery, J Y, Hofmann, A, Koutchouk, Jean-Pierre, Myers, S, Vos, L
Acceleration and stacking of alpha particles in the CERN Linac, PS and ISR (1990)
Bouthéon, M, Cappi, R, Haseroth, H, Hill, C E, Koutchouk, Jean-Pierre
ISR beam monitoring system using "Schottky noise" and transfer function (1990)
Borer, J, Hémery, J Y, Koutchouk, Jean-Pierre, Peschardt, E, Vos, L
Système de compression d'informations issues de télémétrie spatiale / (1973)
Thesis (doctoral)--Université de Paris-Sud, 1973.