[Show abstract][Hide abstract] ABSTRACT: NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose
experimental facility to study hadron production in hadron-proton,
hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton
Synchrotron. It recorded the first physics data with hadron beams in 2009 and
with ion beams (secondary 7Be beams) in 2011.
NA61/SHINE has greatly profited from the long development of the CERN proton
and ion sources and the accelerator chain as well as the H2 beamline of the
CERN North Area. The latter has recently been modified to also serve as a
fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous
components of the NA61/SHINE set-up were inherited from its predecessors, in
particular, the last one, the NA49 experiment. Important new detectors and
upgrades of the legacy equipment were introduced by the NA61/SHINE
This paper describes the state of the NA61/SHINE facility - the beams and the
detector system - before the CERN Long Shutdown I, which started in March 2013.
[Show abstract][Hide abstract] ABSTRACT: The H8 beam line on the North Area of CERN SPS is a multipurpose experimental
secondary particle beam able to transport particles of various types (hadrons,
electrons, muons and ions) in a large momentum range from 10 GeV/c up to the
top SPS energy (400 or 450 GeV/C). During the 2003-2004 shutdown the beam line
was modi?fied in order to accommodate a new tertiary beam line, able to produce
and transport particles in the momentum range of 1 to 9 GeV/c. Such low
momentum hadron and electron particle beams are requested by the LHC
experiments in order to calibrate various sub-detector systems. The design and
?rst performance results from this new tertiary beam are described here.
[Show abstract][Hide abstract] ABSTRACT: MedAustron is a synchrotron based light-ion beam therapy centre for cancer treatment as well as for clinical and non-clinical research currently in its construction phase. The accelerator design is based on the CERN-PIMMS study and its technical implementation by CNAO. This paper presents a status overview over the whole project detailing the achieved progress of the building construction & technical infrastructure installation in Wiener Neustadt, Austria, as well as of the accelerator development, performed at CERN and partially at PSI. The design and procurement status and future planning of the various accelerator components is elaborated.
[Show abstract][Hide abstract] ABSTRACT: The reconstruction of photons in the ATLAS detector is studied with data taken during the 2004 Combined Test Beam, where a full slice of the ATLAS detector was exposed to beams of particles of known energy at the CERN SPS. The results presented show significant differences in the longitudinal development of the electromagnetic shower between converted and unconverted photons as well as in the total measured energy. The potential to use the reconstructed converted photons as a means to precisely map the material of the tracker in front of the electromagnetic calorimeter is also considered. All results obtained are compared with a detailed Monte-Carlo simulation of the test-beam setup which is based on the same simulation and reconstruction tools as those used for the ATLAS detector itself.
Journal of Instrumentation 03/2011; 6(04):P04001. · 1.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: MedAustron , the Austrian hadron therapy center is currently under construction. Irradiation will be performed using active scanning with proton and carbon ion pencil beams. Major beam delivery system contributors to dose heterogeneities are evaluated: beam position, beam size and spot weight errors. Their individual and combined effect on the dose distribution is quantified, using semianalytical models of lateral beam spread in the nozzle and target and depth-dose curves for protons and carbon ions. Deduced requirements on critical parts of the beam delivery system are presented. Preventive and active methods to suppress the impact of beam delivery inaccuracies are proposed.
[Show abstract][Hide abstract] ABSTRACT: The Beta-Beam is a concept of large scale facility that aims at providing pure electronic neutrino and antineutrino beams for the measurement of νe → νμ oscillations. Beta-decaying nuclides are produced in large amounts in a facility of the scale of EURISOL, and are then post-accelerated and stored at large $\gamma$ in a racetrack decay ring. We present here a conceptual design of the accelerator chain of a Beta-Beam based at CERN.
European Physical Journal A 01/2011; · 2.42 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: MedAustron, the Austrian hadron therapy center is currently under construction. Irradiations will be performed using active scanning with a proton or carbon ion pencil beam which is subject to scattering in vacuum windows, beam monitors and air gap. For applications where sharp lateral beam penumbras are required in order to spare critical organs from unwanted dose, scattering should be minimal. A semi-empirical scattering model has been established to evaluate beam size growth at the patient due to upstream scattering. Major design choices for proton gantry and nozzle based on the scattering calculations are presented.
[Show abstract][Hide abstract] ABSTRACT: A new method for calibrating the hadron response of a segmented calorimeter
is developed and successfully applied to beam test data. It is based on a
principal component analysis of energy deposits in the calorimeter layers,
exploiting longitudinal shower development information to improve the measured
energy resolution. Corrections for invisible hadronic energy and energy lost in
dead material in front of and between the calorimeters of the ATLAS experiment
were calculated with simulated Geant4 Monte Carlo events and used to
reconstruct the energy of pions impinging on the calorimeters during the 2004
Barrel Combined Beam Test at the CERN H8 area. For pion beams with energies
between 20 GeV and 180 GeV, the particle energy is reconstructed within 3% and
the energy resolution is improved by between 11% and 25% compared to the
resolution at the electromagnetic scale.
Journal of Instrumentation 12/2010; 6(06). · 1.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: In 2004 at the ATLAS (A Toroidal LHC ApparatuS) combined test beam, one slice of the ATLAS barrel detector (including an Inner Detector set-up and the Liquid Argon calorimeter) was exposed to particles from the H8 SPS beam line at CERN. It was the first occasion to test the combined electron performance of ATLAS. This paper presents results obtained for the momentum measurement p with the Inner Detector and for the performance of the electron measurement with the LAr calorimeter (energy E linearity and resolution) in the presence of a magnetic field in the Inner Detector for momenta ranging from 20 GeV/c to 100 GeV/c. Furthermore the particle identification capabilities of the Transition Radiation Tracker, Bremsstrahlungs-recovery algorithms relying on the LAr calorimeter and results obtained for the E/p ratio and a way how to extract scale parameters will be discussed.
Journal of Instrumentation 11/2010; 5:11006. · 1.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A fully instrumented slice of the ATLAS detector was exposed to test beams from the SPS (Super Proton Synchrotron) at CERN in 2004. In this paper, the results of the measurements of the response of the barrel calorimeter to hadrons with energies in the range 20–350 GeV and beam impact points and angles corresponding to pseudo-rapidity values in the range 0.2–0.65 are reported. The results are compared to the predictions of a simulation program using the Geant 4 toolkit.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 09/2010; A621:134-150. · 1.32 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The response of the ATLAS barrel calorimeter to pions with momenta from 2 to 180~GeV~ is studied in a test--beam at the CERN H8 beam line. %Various methods to reconstruct the deposited pion energies are studied. The mean energy, the energy resolution and the longitudinal and radial shower profiles, and, various observables characterising the shower topology in the calorimeter are measured. The data are compared to Monte Carlo simulations based on a detailed description of the experimental set--up and on various models describing the interaction of particles with matter based on Geant4.
[Show abstract][Hide abstract] ABSTRACT: The Large Hadron Collider (LHC) now under commissioning at CERN is a 26.7 km collider based on several thousand high-field superconducting magnets, the majority of which operating in superfluid helium below 2 K and some isolated magnets operating in normal helium at 4.5 K. Four superconducting links (DSLs) of about 76 m in length and one of about 517 m in length, were designed, constructed and installed over a three year period. Their purpose is to transport current over long distances whenever underground LHC space constraints prevents to put power converters, current feed boxes and magnets in each others’ proximity. The four 76 m long DSLs transport current between current feed boxes and several of the isolated magnets, whereas the 517 m long DSL transports current between two current feed boxes. The links are comprised of cryogenic, vacuum-insulated, transfer lines housing one or more superconducting cables. The operating temperatures are about 5 K for the DSL part that houses the cable and about 60 K for the heat shield. Their commissioning and performance results at first operational experience in the beginning of 2008 are discussed
[Show abstract][Hide abstract] ABSTRACT: MedAustron is a synchrotron based accelerator facility for cancer treatment in Austria currently in the development phase. The design is based on the PIMMS study  and CNAO  synchrotron. In addition to the clinical application, the accelerator will also provide beams for nonclinical research in the fields of medical radiation physics, radiation biology and experimental physics with an extended proton energy range beyond medical requirements to 800 MeV. The differences to others medical acceleratorbased facilities will be elaborated, specifically the used source technologies and configuration (starting up with protons (p) and carbon ions (C6+) allowing a later upgrade to ion species up to neon) and the online verification of all relevant beam parameters. The current project status is presented.
[Show abstract][Hide abstract] ABSTRACT: A fully instrumented slice of the ATLAS central detector was exposed to test beams from the SPS (Super Proton Synchrotron) at CERN in 2004. In this paper, the response of the central calorimeters to pions with energies in the range between 3 and 9 GeV is presented. The linearity and the resolution of the combined calorimetry (electromagnetic and hadronic calorimeters) was measured and compared to the prediction of a detector simulation program using the toolkit Geant 4.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 08/2009; A607(2):372-386. · 1.32 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The MERIT experiment is a proof-of-principle test of a target system for high power proton beam to be used as front-end for a neutrino factory complex or amuon collider. The experiment took data in autumn 2007 with the fast extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of about 30 × 1012 protons per pulse. We report results from the portion of the MERIT experiment in which separated beam pulses were delivered to a free mercury jet target with time intervals between pulses varying from 2 to 700 μs. The analysis is based on the responses of particle detectors placed along side and downstream of the target.
[Show abstract][Hide abstract] ABSTRACT: MedAustron is a synchrotron based accelerator facility for cancer treatment with proton and carbon ion beams. In addition to the clinical application, the accelerator will also provide beams for non-clinical research, in the fields of medical radiation physics, radiation biology and experimental physics.
[Show abstract][Hide abstract] ABSTRACT: High power targets are one of the major issues in an accelerator complex for future HEP physic studies. The paper will review status of studies worldwide. It will focus on the status of the MERIT mercury-jet target experiment at CERN.
[Show abstract][Hide abstract] ABSTRACT: This document summarizes the work of the Accelerator Working Group (AWG) of the International Scoping Study (ISS) of a Future Neutrino Factory and Superbeam Facility. The main goal of the activity was to reach consensus on a baseline design for a Neutrino Factory complex, including proton driver parameters, choice of target, front-end design, acceleration system design, and decay ring geometry. Another goal was to explore the commonality, if any, between the proton driver for a Neutrino Factory and those for a Superbeam or Beta Beam facility. In general, the requirements for either of the latter facilities are less stringent than those for a Neutrino Factory. Here, we discuss concepts, parameters, and expected performance of the required subsystems for our chosen baseline design of a Neutrino Factory. We also give an indication of the main R&D tasks -- many of which are already under way -- that must be carried out to finalize facility design approaches.
[Show abstract][Hide abstract] ABSTRACT: Thermal stress-waves are generated in the solid target
material when the proton beam interacts. These stress waves excite
natural oscillations of the target or cause plastic deformations.
Hence, an experimental setup with a laser Doppler vibrometer
[CITE] was developed to investigate free surface
vibrations of cylindrical targets. The target configurations for
RIB and conventional neutrino beams (CNGS project) were
investigated to analyze proton induced thermal stress-wave
generation and propagation.
The European Physical Journal Special Topics 10/2007; 150(1):373-378. · 1.76 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We test a target concept devised for the purpose of producing copious secondary pions and capturing the muon decay products. This experiment is designed to test the target system for a neutrino factory or muon collider and consists of a free flowing mercury stream embedded in a high-field solenoid. Key components are described.