Shaposhnikova, E N, Arduini, Gianluigi, Axensalva, J, Benedetto, E, Calatroni, S, Chiggiato, P, ...
Electron cloud build-up is a major limitation for the operation of the SPS with LHC beam above nominal intensity. These beams are envisaged in the frame of the LHC luminosity upgrade and will be...
Analysis of the transverse SPS Beam coupling impedance with short and long bunches (2009)
Salvant, B, Calaga, R, De-Maria, R, Arduini, Gianluigi, Burkhardt, H, Damerau, H, ...
The upgrade of the CERN Large Hadron Collider (LHC) would require a four- to fivefold increase of the single bunch intensity presently obtained in the Super Proton Synchrotron (SPS). Operating at...
Controlled Transverse Emittance Blow-up in the CERN SPS (2009)
Métral, E, Arduini, Gianluigi, Arnold Malandain, F, Höfle, Wolfgang, Manglunki, D
For several years, a large variety of beams have been prepared in the LHC injectors, such as single-bunch and multi-bunch beams, with 25 ns, 50 ns and 75 ns bunch spacings, nominal and intermediate...
Ions for LHC: Towards Completion of the Injector Chain (2008)
Manglunki, Django, Albert, M, Angoletta, M E, Arduini, Gianluigi, Baudrenghien, P, Bellodi, G, ...
The commissioning of CERN's ion injector complex [1] to allow 1.1 PeV collisions of ions in LHC is well under way. After the Low Energy Ion Ring (LEIR) in 2005 [2] and the Proton Synchrotron (PS) in...
Optics Measurements and Matching of TT2-TT10 Line for Injection of the LHC Beam in the SPS (2008)
Benedetto, E, Arduini, Gianluigi, Guerrero, A, Jacquet, D
A well matched injection in the SPS is very important for preserving the emittance of the LHC beam. The paper presents the algorithms used for the analysis and the results of the optics measurements...
Beam Commissioning of the SPS-to-LHC Transfer Line TI 2 (2008)
Uythoven, J, Arduini, Gianluigi, Assmann, Ralph Wolfgang, Gilbert, N, Goddard, B, Kain, V, ...
The transfer line for the LHC Ring 1 was successfully commissioned with beam in the autumn of 2007. After extraction from the SPS accelerator and about 2.7 km of new transfer line, the beam arrived...
Salvant, B, Arduini, Gianluigi, Calaga, R, Jones, R, Métral, E, Papotti, G, ...
Since 2003, single bunches of protons with high intensity (1.2e11 protons) and low longitudinal emittance (0.2 eVs) have been observed to suffer from heavy losses in less than one synchrotron period...
Experimental Study of the Electron Cloud Instability at the CERN SPS (2008)
Rumolo, G, Arduini, Gianluigi, Benedetto, E, Calaga, R, Métral, E, Papotti, G, ...
The electron cloud instability limits the performance of many existing proton and positron rings. A simulation study carried out with the HEADTAIL code revealed that the threshold for its onset...
CERN SPS Impedance in 2007 (2008)
Métral, E, Arduini, Gianluigi, Bohl, T, Burkhardt, H, Calaga, R, Caspers, F, ...
Each year several measurements of the beam coupling impedance are performed in both longitudinal and transverse planes of the CERN Super Proton Synchrotron to keep track of its evolution. In...
Nominal LHC Beam Instability Observations in the CERN Proton Synchrotron (2007)
Steerenberg, R, Arduini, Gianluigi, Benedetto, E, Blas, A, Höfle, Wolfgang, Métral, E, ...
The nominal LHC beam has been produced successfully in the CERN Proton Synchrotron since 2003. However, after having restarted the CERN PS in spring 2006, the LHC beam was set-up and observed to be...
Tomás, R, Arduini, Gianluigi, Calaga, R, Faus-Golfe, A, Rumolo, G, Zimmermann, F
In recent years several measurements of the SPS nonlinear chromaticity have been performed in order to determine the non-linear optics model of the SPS machine at injection energy for different...
Beam Scraping for LHC Injection (2007)
Burkhardt, H, Arduini, Gianluigi, Fischer, C, Gras, J-J, Koschik, A, Kramer, Daniel, ...
Operation of the LHC will require injection of very high intensity beams from the SPS to the LHC. Fast scrapers have been installed and will be used in the SPS to detect and remove any existing halo...
Transverse Impedance of LHC Collimators (2007)
Métral, E, Arduini, Gianluigi, Assmann, Ralph Wolfgang, Boccardi, A, Bracco, C, Bohl, T, ...
The transverse impedance in the LHC is expected to be dominated by the numerous collimators, most of which are made of Fibre-Reinforced-Carbon to withstand the impacts of high intensity proton beams...
Tracking Study of the Effect of BPM Impedances in the SPS (2007)
Rumolo, G, Arduini, Gianluigi, Métral, E, Spataro, B
Following the observation of a Transverse Mode Coupling Instability (TMCI) in the SPS [1, 2], a systematic estimate of the impedance of the various pieces of equipment installed in the machine has...
Studies of Beam Losses from Failures of SPS Beam Dump Kickers (2007)
Kramer, T, Arduini, Gianluigi, Berrig, O, Carlier, E, Ducimetière, L, Goddard, B, ...
The SPS beam dump extraction process was studied in detail to investigate the possibility of operation with reduced kicker voltage and to fully understand the trajectories and loss patterns of...
Fast Vertical Single-bunch Instability at Injection in the CERN SPS: An Update (2007)
Arduini, Gianluigi, Bohl, T, Burkhardt, H, Métral, E, Rumolo, G, Salvant, B
Following the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed...
Beam Loss Response Measurements with a LHC Prototype Collimator in the SPS (2007)
Weiler, Th, Arduini, Gianluigi, Assmann, Ralph Wolfgang, Bracco, C, Braun, H, Dehning, B, ...
Beam tests with a Large Hadron Collider (LHC) prototype collimator were performed at the Super Proton Synchrotron (SPS) in autumn 2006. Applying a new collimator control system many new beam...
Comparison between measured and simulated beam loss patterns in the CERN SPS (2006)
Redaelli, S, Arduini, Gianluigi, Assmann, R W, Robert-Démolaize, G
A prototype of an LHC collimator has been tested with proton beams at the CERN SPS. The interaction of the circulating proton beam with the carbon collimator jaws generated secondary proton beams...
Tune shift induced by nonlinear resistive wall wake field of flat collimator (2006)
Zimmermann, Frank, Arduini, Gianluigi, Assmann, R W, Burkhardt, H, Caspers, F, Gasior, M, ...
We present formulae for the coherent and incoherent tune shifts due to the nonlinear resistive wall wake field for a single beam traveling between two parallel plates. In particular, we demonstrate...
Métral, Elias, Arduini, Gianluigi, Bohl, Thomas, Burkhardt, Helmut, Rumolo, Giovanni, Spataro, Bruno
Since 2003, high-intensity single-bunch proton beams with low longitudinal emittance have been affected by heavy losses after less than one synchrotron period after injection. The effects of the...
SPS Working Point Studies (2006)
Roncarolo, F, Arduini, Gianluigi, Arimatea, C, Jacquet, D, Normann, L, Pereira, L
The values of the betatron tunes (i.e. the working point) of a circular accelerator are a key feature for the machine operation. This report presents systematic studies, carried out in the SPS, aimed...
LHC Collimation: Design and Results from Prototyping and Beam Tests (2005)
Assmann, R W, Aberle, Oliver, Arduini, Gianluigi, Baishev, Igor S, Holzer, Eva Barbara, Bertarelli, Alessandro, ...
The problem of collimation and beam cleaning is one of the most challenging aspects of the LHC project. A collimation system must be designed, built, installed and commissioned with parameters that...
Electron Cloud Measurements in the SPS in 2004 (2005)
Schulte, Daniel, Arduini, Gianluigi, Baglin, Vincent, Jiménez, J M, Zimmermann, Frank
Novel measurements of the electron cloud have been performed in the SPS in 2004. The LHC beam in the SPS consists of a number of short bunch trains. By varying the distance between these trains it is...
Electron Cloud Measurements in the SPS in 2004 (2005)
Schulte, Daniel, Arduini, Gianluigi, Baglin, Vincent, Jiménez, J M, Zimmermann, Frank
Novel measurements of the electron cloud have been performed in the SPS in 2004. The LHC beam in the SPS consists of a number of short bunch trains. By varying the distance between these trains it is...
Measurements of the LHC Collimator Impedance with Beam in the SPS (2005)
Burkhardt, Helmut, Arduini, Gianluigi, Assmann, R W, Caspers, Fritz, Gasior, Marek, Grudiev, Alexei, ...
The transverse impedance of the LHC collimators will likely dominate the overall transverse impedance in the LHC at high energies and potentially limit the maximum intensity. A prototype collimator...
2003-2004 Nonlinear Optics Measurements and Modeling for the CERN SPS (2005)
Faus-Golfe, Angeles, Arduini, Gianluigi, Tomas, Rogelio, Zimmermann, Frank
In 2003 and 2004 nonlinear chromaticity, amplitude detuning, chromatic phase advance, resonance driving terms and off-energy orbits were measured in the CERN SPS at 14 GeV/c and 26 GeV/c,...
Benedetto, Elena, Arduini, Gianluigi, Feng, Bing, Franchetti, Giuliano, Ghalam, Ali F, Katsouleas, Thomas C, ...
Several simulation codes have been adapted so as to model the single-bunch electron-cloud instability including a realistic variation of the optical functions with longitudinal position. In addition,...
Benedetto, Elena, Arduini, Gianluigi, Feng, Bing, Franchetti, Giuliano, Ghalam, Ali F, Katsouleas, Thomas C, ...
Several simulation codes have been adapted so as to model the single-bunch electron-cloud instability including a realistic variation of the optical functions with longitudinal position. In addition,...
Measurements of the LHC Collimator Impedance with Beam in the SPS (2005)
Burkhardt, Helmut, Arduini, Gianluigi, Assmann, R W, Caspers, Fritz, Gasior, Marek, Grudiev, Alexei, ...
The transverse impedance of the LHC collimators will likely dominate the overall transverse impedance in the LHC at high energies and potentially limit the maximum intensity. A prototype collimator...
Optics Studies of the LHC Beam Transfer Line TI 8 (2005)
Arduini, Gianluigi, Chao Yu Chiu, Goddard, B, Jacquet, D, Kain, V, Lamont, M, ...
The optics of the newly commissioned LHC beam transfer line TI 8 was studied with beam trajectories, dispersion and profile measurements. Steering magnet response measurements were used to analyze...
Optics Studies of the LHC Beam Transfer Line TI 8 (2005)
Arduini, Gianluigi, Chao Yu Chiu, Goddard, B, Jacquet, D, Kain, V, Lamont, M, ...
The optics of the newly commissioned LHC beam transfer line TI 8 was studied with beam trajectories, dispersion and profile measurements. Steering magnet response measurements were used to analyze...
Energy Calibration of the SPS with Proton and Lead Ion Beams (2005)
Wenninger, Jörg, Arduini, Gianluigi, Arimatea, Claudio, Bohl, T, Collier, Paul, Cornelis, Karel
The momentum of the 450 GeV/c proton beam of the CERN Super Proton Synchrotron was determined by a high precision measurement of the revolution frequencies of proton and lead ion beams. To minimize...
Recent intensity increase in the CERN accelerator chain (2005)
Shaposhnikova, Elena, Arduini, Gianluigi, Bohl, T, Chanel, Michel, Garoby, Roland, Hancock, Steven, ...
Future requests for protons from the physics community at CERN, especially after the start-up of the CNGS experiments in 2006, can only be satisfied by a substantial increase in the SPS beam...
Performance of the CERN SPS Fast Extraction for the CNGS Facility (2005)
Gaxiola, Enrique, Arduini, Gianluigi, Höfle, Wolfgang, Roncarolo, Federico, Vogel, Elmar, Vossenberg, Eugène B
The SPS LSS4 fast extraction system will serve both the anti-clockwise ring of the LHC and the long baseline neutrino (CNGS) facility. For the latter two extractions spaced by 50 ms, each affecting...
Commissioning of the LHC Beam Transfer Line TI 8 (2005)
Uythoven, Jan, Arduini, Gianluigi, Chao Yu Chiu, Goddard, Brennan, Jacquet, Delphine, Kain, Verena, ...
The first of the two LHC transfer lines was commissioned in autumn 2004. Beam reached an absorber block located some 2.5 km downstream of the SPS extraction point at the first shot, without the need...
Commissioning of the LHC Beam Transfer Line TI 8 (2005)
Uythoven, Jan, Arduini, Gianluigi, Chao Yu Chiu, Goddard, Brennan, Jacquet, Delphine, Kain, Verena, ...
The first of the two LHC transfer lines was commissioned in autumn 2004. Beam reached an absorber block located some 2.5 km downstream of the SPS extraction point at the first shot, without the need...
Transverse Mode-Coupling Instability in the CERN Super Proton Synchrotron (2005)
Arduini, Gianluigi, Benedetto, Elena, Burkhardt, H, Métral, E, Rumolo, Giovanni, Shaposhnikova, Elena
A vertical single-bunch instability has been observed in 2003 right after injection at 26 GeV/c in the CERN Super Proton Synchrotron (SPS). High-intensity proton bunches (~1.2 1011 p/b) with low...
Electron-Cloud Build-Up Simulations and Experiments at CERN (2004)
Arduini, Gianluigi, Baglin, V, Bohl, T, Jenninger, B, Jiménez, M, Laurent, Jean Michel, ...
We benchmark the predictions of electron-cloud buildup simulations against measurements at the CERN SPS. Specifically we compare the electron flux at the wall, electron-energy spectra, heat loads and...
Localizing Impedance Sources from Betatron-phase Beating in the CERN SPS (2004)
Arduini, Gianluigi, Carli, Christian, Zimmermann, Frank
Multi-turn beam-position data recorded after beam excitation can be used to extract the betatron-phase advance between adjacent beam position monitors (BPMs) by a harmonic analysis. Performing this...
Accuracy of Profile Monitors and LHC Emittance Measurements (2004)
Arduini, Gianluigi, Dehning, Bernd, Ferioli, G, Koopman, J, Kramer, Daniel, Roncarolo, F
The monitoring and controlling of the beam transverse emittance is essential to allow high luminosity performances in a collider operation. The profile monitors in the LHC injection chain are...
Observation of a Fast Single-Bunch Transverse Instability on Protons in the SPS (2004)
Arduini, Gianluigi, Benedetto, Elena, Burkhardt, H, Métral, Elias, Rumolo, Giovanni
The longitudinal impedance of the SPS has been reduced significantly by hardware modifications over the last years and the threshold for longitudinal instabilities increased accordingly. We now...
Beam Quality Preservation in the CERN PS-SPS Complex (2004)
The LHC will require beams of unprecedented transverse and longitudinal brightness. Their production imposes tight constraints on the emittance growth in each element of the LHC injector chain,...
Beam Quality Preservation in the CERN PS-SPS Complex (2004)
The LHC will require beams of unprecedented transverse and longitudinal brightness. Their production imposes tight constraints on the emittance growth in each element of the LHC injector chain,...
Beam Induced Heating of the SPS Fast Pulsed Magnets (2004)
Arduini, Gianluigi, Bohl, T, Caspers, Friedhelm, Gaxiola, E H, Kroyer, T, Timmins, M, ...
Fast pulsed magnets with ferrite yokes are used in CERN's SPS accelerator for beam injection, extraction and excitation for tune measurements. The impedance of the ferrite structures can provoke...
The AB-LHC Technical Review - November 2003 (2004)
Albert, M, Arduini, Gianluigi, Bailey, R, Brüning, Oliver Simon, Collier, Paul, Hanke, K, ...
The AB-LTC review was held over 3 days and five open sessions in November 2003. It was designed to cover all technical sub-projects of the LHC under the authority of the AB department. There had been...
New SPS cooling system: "The day after" (2003)
During the shutdown from November 2000 until May 2001, major modifications of the cooling system of SPS have been carried out in the frame of the refurbishment and restructuring of the water network...
Present Understanding of Electron Cloud Effects in the Large Hadron Collider (2003)
Arduini, Gianluigi, Baglin, V, Benedetto, Elena, Cimino, R, Collier, Paul, Collins, I R, ...
We discuss the predicted electron cloud build up in the arcs and the long straight sections of the LHC, and its possible consequences on heat load, beam stability, long-term emittance preservation,...
Present Understanding of Electron Cloud Effects in the Large Hadron Collider (2003)
Arduini, Gianluigi, Baglin, V, Benedetto, Elena, Cimino, R, Collier, Paul, Collins, I R, ...
We discuss the predicted electron cloud build up in the arcs and the long straight sections of the LHC, and its possible consequences on heat load, beam stability, long-term emittance preservation,...
The Electron Cloud Instability of the LHC Beam in the CERN SPS (2003)
Arduini, Gianluigi, Cornelis, K, Höfle, Wolfgang, Rumolo, Giovanni, Zimmermann, Frank
The electron cloud induced by the LHC beam in the SPS occurs mainly in the dipoles and it is responsible for strong transverse instabilities. In the horizontal plane a coupled bunch mode instability...
The LHC Proton Beam in the CERN SPS (2003)
Arduini, Gianluigi, Baudrenghien, P, Bohl, T, Collier, Paul, Cornelis, K, Höfle, Wolfgang, ...
During the 2001 run the beam-induced electron-cloud, generating dramatic vacuum pressure increases and fast transverse instabilities, was the main limitation in the achievement of the nominal LHC...
The Electron Cloud Instability of the LHC Beam in the CERN SPS (2003)
Arduini, Gianluigi, Cornelis, K, Höfle, Wolfgang, Rumolo, Giovanni, Zimmermann, Frank
The electron cloud induced by the LHC beam in the SPS occurs mainly in the dipoles and it is responsible for strong transverse instabilities. In the horizontal plane a coupled bunch mode instability...
The LHC Proton Beam in the CERN SPS: an Update (2003)
Arduini, Gianluigi, Baudrenghien, P, Bohl, T, Collier, Paul, Cornelis, K, Höfle, Wolfgang, ...
During the 2001 run the beam-induced electron-cloud, generating dramatic vacuum pressure increases and fast transverse instabilities, was the main limitation in the achievement of the nominal LHC...
2002 Nonlinear Optics Measurements and Modelling for the CERN SPS (2003)
Faus-Golfe, Angeles, Tomas, Rogelio, Arduini, Gianluigi, Zimmermann, Frank
In 2002, nonlinear chromaticity, coupling, amplitude-dependent detuning, chromatic phase advance, resonance driving terms, and off-energy orbits were measured in the CERN SPS at 26 GeV/c. The optics...
Electron Cloud Studies and Beam Scrubbing Effect in the SPS (2003)
Jim Nez, J M, Arduini, Gianluigi, Collier, Paul, Ferioli, G, Henrist, Bernard, Hilleret, Noël, ...
The performance of the SPS as LHC injector has been limited, with LHC-type beams, by the electron cloud multipacting for high bunch intensities (>6.0x10**10 protons/bunch). To study in detail the...
Electron cloud with LHC-type beams in the SPS: A review of three years of measurements (2003)
Jiménez, J M, Arduini, Gianluigi, Collier, Paul, Ferioli, G, Henrist, Bernard, Hilleret, Noël, ...
In August 1999, high bunch intensities LHC-type beams were injected for the first time in the SPS inducing strong vacuum pressure rises, perturbations on the electrostatic pick-ups and beam...
Status of the LHC proton beam in the CERN SPS (2002)
Arduini, Gianluigi, Baudrenghien, P, Bohl, T, Collier, Paul, Cornelis, Karel, Höfle, Wolfgang, ...
During the 2000-2001 shutdown the SPS has undergone a major hardware upgrade to cope with its role of LHC injector. An impedance reduction campaign, improvements to the RF beam-control systems, and...
Arduini, Gianluigi, Collier, Paul, Dehning, Bernd, Ferioli, G, Henrist, Bernard, Jensen, L, ...
Electron cloud effects presently limit the performances of the CERN SPS with LHC type beams [1] and are of concern for the LHC itself [2]. Electron multipacting in the SPS produces dramatic dynamic...
Electron cloud and ion effects (2002)
The significant progress in the understanding and control of machine impedances has allowed obtaining beams with increasing brilliance. Dense positively charged beams generate electron clouds via gas...
Modelling Nonlinear Optics in the CERN SPS (2002)
Zimmermann, Frank, Arduini, Gianluigi, Faus-Golfe, A, Collier, Paul
Nonlinear fields arising from eddy currents in the vac-uum chamber and remanent fields in the magnets of the CERN SPS vary with time and with the acceleration cycle. We describe a procedure of...
Towards a common monitoring system for the accelerator and technical control rooms at CERN (2002)
Arduini, Gianluigi, Arimatea, C, Bätz, M, Manglunki, Django, Priestnall, K, ...
The communication and coordination between the CERN accelerator and technical control rooms will be a critical issue for an efficient operation of the LHC and its injectors, which are expected to...
Transverse Behaviour of the LHC Proton Beam in the SPS: an Update (2001)
Arduini, Gianluigi, Cornelis, Karel, Höfle, Wolfgang, Rumolo, Giovanni, Zimmermann, Frank
During the 1999 SPS run, strong transverse instabilities were observed with the LHC beam [1]. Both the instability characteristics and the identical threshold current as for beam-induced electron...
The SPS as a Vacuum Test Bench for the Electron Cloud Studies with LHC Type Beams (2001)
Arduini, Gianluigi, Jiménez, J M, Weiss, K
The SPS machine has been operating with LHC-type beams with bunch intensities up to 8x1010 protons (70% of LHC nominal intensity). This paper will give evidence of the electron cloud phenomenon as...
The SPS as a Vacuum Test Bench for the Electron Cloud Studies with LHC Type Beams (2001)
Arduini, Gianluigi, Jiménez, J M, Weiss, K
The SPS machine has been operating with LHC-type beams with bunch intensities up to 8x1010 protons (70% of LHC nominal intensity). This paper will give evidence of the electron cloud phenomenon as...
Arduini, Gianluigi, Chao, Y, Giovannozzi, Massimo, Klem, J T, Manglunki, Django, Martini, M
The tight emittance budget for injection into the LHC demands an accurate matching of the transfer line from the PS to the SPS to minimise blow-up at injection into the SPS. Precise two-dimensional...
Measurements of the SPS transverse impedance in 2000 (2001)
Arduini, Gianluigi, Burkhardt, H, Cornelis, Karel, Klem, J T, Zimmermann, Frank, Zorzano-Mier, M P
We report on measurements of coherent tune shifts, head-tail growth rates, and current-dependent betatron phase advances at the CERN SPS in the year 2000. Comparing results obtained at two different...
Arduini, Gianluigi, Cornelis, Karel, Gröbner, Oswald, Hilleret, Noël, Höfle, Wolfgang, Jiménez, J M, ...
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...
New Methods to Derive the Optical and Beam Parameters in Transport Channels (2000)
Arduini, Gianluigi, Giovannozzi, Massimo, Hanke, K, Manglunki, Django, Martini, M
The standard approach to compute the optical parameters and the beam emittance in a transport channel is based on the analysis of the profiles measured by three monitors. This requires the...
Electron Cloud: Observations with LHC-Type Beams in the SPS (2000)
Arduini, Gianluigi, Cornelis, Karel, Gröbner, Oswald, Hilleret, Noël, Höfle, Wolfgang, Jiménez, J M, ...
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...
Transverse Instabilities of the LHC Proton Beam in the SPS (2000)
Arduini, Gianluigi, Cornelis, Karel, Ferioli, G, Jensen, L, Zimmermann, Frank
The availability from the injectors of the proton beam required for the LHC era has allowed studying its transverse behaviour in the SPS. Profile and beam oscillation measurements evidenced the...
LEP Operation and Performance with 100 GeV Colliding Beams (2000)
Assmann, R W, Arduini, Gianluigi, Bailey, R, Butterworth, A, Collier, Paul, Cornelis, Karel, ...
Luminosity production in LEP was extended to 101 GeV beam energy in 1999 and 104.4 GeV in 2000. The performance was continually optimised, resulting in 1999 peak and integrated luminosities higher...
Multiturn Measurements at the CERN SPS (2000)
Klem, J T, Arduini, Gianluigi, Morpurgo, G
The CERN SPS multiturn facility, based on the new beam orbit measurement system MOPOS, enables the User to acquire the position of the beam at each beam position monitor (BPM) over a number of...
Measurements of coherent tune shifts and head-tail growth rates at the CERN SPS (2000)
Zorzano-Mier, M P, Arduini, Gianluigi, Burkhardt, H, Cornelis, Karel, Zimmermann, Frank, Papaphilippou, Y
As part of an ongoing effort to monitor SPS impedance changes with regard to LHC, the coherent tune shifts and head-tail growth rates in the SPS were measured for single proton bunches at 26 GeV....
Electron Cloud Effects in the CERN SPS and LHC (2000)
Arduini, Gianluigi, Baglin, V, Brüning, Oliver Simon, Cappi, R, Caspers, Friedhelm, Collier, Paul, ...
Electron cloud effects have been recently observed in the CERN SPS in the presence of LHC type proton beams with 25 ns bunch spacing. Above a threshold intensity of about 4 X 10^12 protons in 81...
Measurement and Optimisation of the PS-SPS Transfer Line Optics (1999)
Arduini, Gianluigi, Giovannozzi, Massimo, Hanke, K, Manglunki, Django, Martini, M, Metral, C
The beam optics of the PS-SPS transfer line at CERN has been studied and optimised for a variety of beams. Betatron and dispersion matching has been performed for the fixed-target proton and ion...
Overview of LEP operation in 1998 (1999)
Arduini, Gianluigi, Assmann, R W, Bailey, R, Burkhardt, H, Butterworth, A, Collier, Paul, ...
After the installation of 32 additional RF cavities in the 1997-1998 shutdown LEP was operated at a beam energy of 94.5 GeV. The total integrated luminosity for the year 1998 clearly surpassed its...
Tuning Knobs for the PS-SPS Transfer Line (1999)
Transverse emittance preservation will be an important issue for the LHC injector chain. Minimisation of the blow-up at injection by tuning independently the Twiss parameters (a,b), the dispersion D...
Acceleration of High Intensity Proton Beams (1999)
Altuna, X, Arduini, Gianluigi, Arimatea, C, Bailey, R, Billen, R, Bohl, T, ...
In 1998 the CERN SPS accelerator finished a five years long program providing 450GeV proton beams for neutrino physics. These experiments required the highest possible beam intensity the SPS can...
Measurement of the optical parameters of a transfer line using multi-profile analysis (1998)
Arduini, Gianluigi, Giovannozzi, Massimo, Manglunki, Django, Martini, M
The standard approach to measure the optical parameters and the emittance in a transfer line is based on the analysis of the profiles measured by three monitors. This is feasible, provided the...
LEP Performance at 91.5 GeV (1998)
Arduini, Gianluigi, Bailey, R, Burkhardt, H, Collier, Paul, Cornelis, Karel, Faugier, A, ...
The 1997 LEP collider run was the first year of the LEP2 program devoted to stable high luminosity running. The good performance of the LEP superconducting RF system allowed to run at beam energies...
On the energy dependence of proton beam extraction with a bent crystal (1998)
Arduini, Gianluigi, Elsener, K, Fidecaro, Giuseppe, Gyr, Marcel, Herr, Werner, Klem, J T, ...
Proton beam extraction from the CERN SPS by means of a bent silicon crystal is reported at three different energies, 14 GeV, 120 GeV and 270 GeV. The experimental results are compared to computer...
Deflection and extraction of Pb ions up to 33 TeV/c by a bent silicon crystal (1997)
Arduini, Gianluigi, Biino, C, Clément, M, Cornelis, Karel, Doble, Niels T, Elsener, K, ...
The first results from an experiment to deflect a beam of fully stripped, ulta-relativistic Pb ions of 400 GeV/c per unit of charge, equivalent to 33 TeV/c, by means of a bent crystal are reported....
Energy Dependence of Crystal Assisted Extraction at the CERN SPS (1997)
Arduini, Gianluigi, Elsener, K, Fidecaro, Giuseppe, Gyr, Marcel, Herr, Werner, Klem, J T, ...
The feasibility of extracting particles from the halo of a circulating beam has been successfully demonstrated in an experiment at the SPS. Although most measurements were obtained at an intermediate...
Parasitic Energy Loss in the LEP Superconducting Cavities (1997)
Arduini, Gianluigi, Brüning, Oliver Simon, Cavallari, Giorgio, Gayet, P, Geschonke, Günther, Häbel, E, ...
The energy loss of bunches in the LEP superconducting (SC) cavities has been determined by measuring the closed orbit as a function of current with the beam position monitors located at finite...
Extraction of 22 TeV/c lead ions from the CERN SPS using a bent silicon crystal (1997)
Arduini, Gianluigi, Cornelis, Karel, Elsener, K, Ferioli, G, Fidecaro, Giuseppe, Gyr, Marcel, ...
The extraction of protons from the halo of a circulating beam has been repeatedly demonstrated at the SPS. In a recent experiment a coasting lead ion beam was available at a momentum of 270 GeV/c per...
Lead ion beam emittance and transmission studies in the PS-SPS complex at CERN (1996)
Arduini, Gianluigi, Bailey, R, Bohl, T, Burkhardt, H, Cappi, R, Carter, C, ...
In the Lead Ion Facility at CERN [1] Pb53+ ion beams are accelerated up to a kinetic energy of 4.2 GeV/u in the CERN PS, extracted and stripped to Pb82+ in the transfer line from PS to SPS where they...
LEP1 operation, 1989-1995 (1996)
Arduini, Gianluigi, Bailey, R, Bohl, T, Bordry, Frederick, Burkhardt, H, Cornelis, C, ...
In October 1995, the last run foreseen for dedicated Z production at CERN was performed in LEP, thereby bringing to a close the first phase of operation of the machine. A total luminosity of 200 pb-1...
The SPS as lead-ion accelerator (1996)
Altuna, X, Arduini, Gianluigi, Arimatea, C, Bailey, R, Blanchard, R R, Bohl, T, ...
In 1995 the CERN SPS was used during two months to accelerate fully stripped ions of the Pb208 isotope from the equivalent proton momentum of 13 GeV/c to 400 GeV/c. The radio frequency swing which is...
Detector magnets for charged particle momentum measurement (1995)
Arduini, Gianluigi, Petrucci, Guido
Basic formulae related to the momentum measurement of charged particles by tracking devices in magnetic fields and typical detector magnet geometries are briefly revised. From these, guidelines are...