Performance of the ATLAS Detector on First Single Beam and Cosmic Ray Data (2009)
We report on performance studies of the ATLAS detector obtained with first single LHC (Large Hadron Collider) beam data in September 2008, and large samples of cosmic ray events collected in the fall...
Aharrouche, M, Colas, Jacques, Di Ciaccio, L, El-Kacimi, M, Gaumer, O, Gouanère, M, ...
A module of the ATLAS electromagnetic barrel liquid argon calorimeter was exposed to the CERN electron test-beam at the H8 beam line upgraded for precision momentum measurement. The available...
Optimizing the Energy Measurement of the ATLAS Electromagnetic Calorimeter (2006)
Lampl, W, Fabjan, C, Aleksa, Martin
This PhD-thesis addresses the calibration of the ATLAS electromagnetic calorimeter. ATLAS is a high-energy physics experiment at the Large Hadron Collider (LHC) which is currently under construction...
Optimizing the Energy Measurement of the ATLAS Electromagnetic Calorimeter (2006)
Lampl, W, Fabjan, Christian Wolfgang, Aleksa, Martin
This PhD-thesis addresses the calibration of the ATLAS electromagnetic calorimeter. ATLAS is a high-energy physics experiment at the Large Hadron Collider (LHC) which is currently under construction...
Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter (2005)
Aubert, B, Beaugiraud, B, Colas, Jacques, Delebecque, P, Di Ciaccio, L, El-Kacimi, M, ...
The construction and assembly of the two half barrels of the ATLAS central electromagnetic calorimeter and their insertion into the barrel cryostat are described. The results of the qualification...
A Vector Hysteresis Model for Superconducting Filament Magnetization in Accelerator Magnets (2003)
Aleksa, Martin, Auchmann, Bernard, Russenschuck, Stephan, Völlinger, C
Magnetic field changes in the coils of superconducting magnets are shielded from the filaments' core by so-called persistent currents which can be modeled by means of the critical state model. This...
The Study of a European Neutrino Factory Complex (2003)
Gruber, P, Aleksa, Martin, Amand, J F, Autin, Bruno, Baldy, J L, Benedikt, Michael, ...
The Neutrino Factory is a new concept for an accelerator that produces a high-intensity, high-energy beam of electron and muon neutrinos - the ultimate tool for neutrino oscillation studies and the...
CLIC Beam Delivery System (2003)
Aleksa, Martin, Assmann, R W, Burkhardt, H, Jeanneret, J B, Redaelli, S, Risselada, Thys, ...
We review the present design for the CLIC beam delivery system as configured for 3 TeV and for 500 GeV, describe some recent developments (including the combined effect of solenoid, crab cavity, and...
Parametric Quadrilateral Meshes for the Design and Optimization of Superconducting Magnets (2002)
Aleksa, Martin, Russenschuck, Stephan, Völlinger, Christine
The program package ROXIE has been developed at CERN for the design and optimization of accelerator magnets. The necessity of extremely uniform fields in the superconducting accelerator magnets for...
Parametric Quadrilateral Meshes for the Design and Optimization of Superconducting Magnets (2002)
Aleksa, Martin, Russenschuck, Stephan, Völlinger, Christine
The program package ROXIE has been developed at CERN for the design and optimization of accelerator magnets. The necessity of extremely uniform fields in the superconducting accelerator magnets for...
Design Status of the CLIC Beam Delivery System (2002)
Aleksa, Martin, Assmann, R W, Blair, G A, Burkhardt, H, Faus-Golfe, A, Redaelli, S, ...
Recent developments on the CLIC collimation and final focus are described. The combination of a shortened linear, or alternative nonlinear, collimation section and a compact final focus substantially...
Aleksa, Martin, Amet, S, Ang, Z, Bottura, L, Buzio, M, Ferracin, P, ...
We report the main results of the magnetic field measurements performed on the full-size LHC superconducting dipoles tested at CERN since summer 1998. Main field strength and field errors are...
Aleksa, Martin, Amet, S, Ang, Z, Bottura, L, Buzio, M, Ferracin, P, ...
We report the main results of the magnetic field measurements performed on the full-size LHC superconducting dipoles tested at CERN since summer 1998. Main field strength and field errors are...
Compensation of magnetization effects in superconducting accelerator magnets (2002)
Völlinger, Christine, Aleksa, Martin, Russenschuck, Stephan
Magnetization effects in the coils of superconducting accelerator magnet deteriorate the field quality at injection field level. The CERN field computation program ROXIE has recently been extended to...
Beam Dynamics Study of a Muon Ionization Cooling Experiment (2002)
Aleksa, Martin, Amand, J F, Garoby, R, Gerigk, F, Hanke, K, Holzer, E B, ...
We present a summary of simulation results on a muon cooling experiment based on 88MHz cavities. The systems studied are subsections of the cooling channel in the CERN reference scheme for a neutrino...
Study of some options for the CLIC final focusing quadrupole (2002)
Aleksa, Martin, Russenschuck, Stephan
This paper describes a feasibility study and the preliminary design for the CLIC final focusing quadrupoles. A possible design for a quadrupole consisting of rare-earth permanent magnet material is...
Aleksa, Martin, Russenschuck, Stephan, Völlinger, Christine
The magnetic field in the coils of superconducting magnets induces so-called persistent currents in the filaments. Persistent currents are bipolar screening currents that do not decay due to the lack...
An Improved Method using RBF Neural Networks to Speed up Optimization Algorithms (2001)
Aleksa, Martin, Bazan, M, Russenschuck, Stephan
The paper presents a method using Radial Basis Function (RBF) neural networks to speed up deterministic search algorithms used for the optimization of superconducting magnets for the LHC accelerator...
The CLIC Study of Magnet Stability and Time-dependent Luminosity Performance (2001)
Aleksa, Martin, Assmann, R W, Coosemans, Williame, Guignard, Gilbert, Leros, Nicolas, Mayoud, Michel, ...
The present parameters of the CLIC study require the collision of small emittance beams with a vertical spot size of 1 nm. The tolerances on vertical quadrupole vi-bration (above a few Hz) are as...
Völlinger, Christine, Aleksa, Martin, Russenschuck, Stephan
Field variations in the LHC superconducting magnets, e. g. during the ramping of the magnets, induce magnetization currents in the superconducting material, the so-called persistent currents that do...
Integrated Design of Superconducting Magnets with the CERN Field Computation Program ROXIE (2000)
Russenschuck, Stephan, Aleksa, Martin, Bazan, M, Lucas, J, Ramberger, S, Völlinger, Christine
The program package ROXIE has been developed at CERN for the field computation of superconducting accelerator magnets and is used as an approach towards the integrated design of such magnets. It is...
Calculation of Persistent Currents in Superconducting Magnets (2000)
Völlinger, Christine, Aleksa, Martin, Russenschuck, Stephan
The paper describes a semi-analytical hysteresis model for hard superconductors. The model is based on the critical state model considering the dependency of the critical current density on the...
Parametric Quadrilateral Meshes for the Design and Optimization of Superconducting Magnets (2000)
Aleksa, Martin, Russenschuck, Stephan, Völlinger, Christine
The program package ROXIE [1] has been developed at CERN for the design and optimization of the superconducting magnets for the LHC.The necessity of extremely uniform (coil dominated) fields in...
Calculation of Persistent Currents in Superconducting Magnets (2000)
Völlinger, Christine, Aleksa, Martin, Russenschuck, Stephan
The paper describes a semi-analytical hysteresis model for hard superconductors. The model is based on the critical state model considering the dependency of the critical current density on the...
Völlinger, Christine, Aleksa, Martin, Russenschuck, Stephan
Field variations in the LHC superconducting magnets, e. g. during the ramping of the magnets, induce magnetization currents in the superconducting material, the so-called persistent currents that do...
Dependence of Drift Tube Performance on the Anode Wire Diameter (2000)
Deile, M, Aleksa, Martin, Dubbert, J, Fabjan, Christian Wolfgang, Gruhn, Charles R, Hessey, N P, ...
Cylindrical pressurized drift tubes with different anode wire diameters wereoperated in a 170~GeV muon test beam. The dependences of spatialresolution, efficiency and streamer probability on the...
Resolution limits of drift tubes (1999)
Riegler, W, Aleksa, Martin, Deile, M, Dubbert, J, Fabjan, Christian Wolfgang, Gruhn, Charles R, ...
Measurements of the drift-tube response to charged particle tracks are compared with a complete simulation. The measured resolution of typically 80\,$\mu$m agrees well with the simulation and allows...
Front-end electronics for drift tubes in a high-rate environment (1999)
Riegler, W, Aleksa, Martin, Deile, M, Dubbert, J, Fabjan, Christian Wolfgang, Gruhn, Charles R, ...
A front-end electronics readout for drift tubes in a high-rate environment is presented. This system allows us to encode several pieces of information (leading edge time, trailing edge time, signal...
Rate effects in high-resolution drift chambers (1999)
Aleksa, Martin, Deile, M, Dubbert, J, Fabjan, Christian Wolfgang, Gruhn, Charles R, Hessey, N P, ...
The impact of high counting rates on the spatial resolution of cylindrical drift tubes is investigated in detail and the results are compared with simulations. Electronics effects and space-charge...