42 research outputs found
PYG4OMETRY: a Python library for the creation of Monte Carlo radiation transport physical geometries
Creating and maintaining computer readable geometries for use in Monte Carlo
Radiation Transport (MCRT) simulations is an error-prone and time-consuming
task. Simulating a system often requires geometry from different sources and
modelling environments, including a range of MCRT codes and computer-aided
design (CAD) tools. PYG4OMETRY is a Python library that enables users to
rapidly create, manipulate, display, read and write Geometry Description Markup
Language (GDML)-based geometry used in simulations. PYG4OMETRY provides
importation of CAD files to GDML tessellated solids, conversion of GDML
geometry to FLUKA and conversely from FLUKA to GDML. The implementation of
PYG4OMETRY is explained in detail along with small examples. The paper
concludes with a complete example using most of the PYG4OMETRY features and a
discussion of extensions and future work
BDSIM: An Accelerator Tracking Code with Particle-Matter Interactions
Beam Delivery Simulation (BDSIM) is a program that simulates the passage of
particles in a particle accelerator. It uses a suite of standard high energy
physics codes (Geant4, ROOT and CLHEP) to create a computational model of a
particle accelerator that combines accurate accelerator tracking routines with
all of the physics processes of particles in Geant4. This unique combination
permits radiation and detector background simulations in accelerators where
both accurate tracking of all particles is required over long range or over
many revolutions of a circular machine, as well as interaction with the
material of the accelerator.Comment: 20 pages, 17 figures. Accepted for publication 28th Jan 202
Results from the laser-wire at ATF2 and development of a fibre laser for its upgrade
The commissioning and development of a laser-wire transverse electron beam profile monitor at the Accelerator Test Facility 2 in Japan is presented. The experimental setup used including a gigawatt laser system is detailed and characterised. Results from data taking in December 2010 are presented detailing the use of the laser-wire to tune the electron beam. In conjunction with this, the use of a fibre-based laser system as a suitable laser source for a laser-wire is discussed. A test bed fibre laser system was constructed to investigate the suitability of fibre lasers and the results are presented demonstrating high efficiency and excellent spatial quality. From this, a laser system capable of high resolution and high repetition intra-train scanning for demonstration at the Accelerator Test Facility 2 was designed, constructed and characterised. A commercial fibre laser system was extended using a photonic crystal fibre where periodic amplification designed to match the duty cycle of an accelerator was used advantageously to achieve higher than normal pulse energies. The results and techniques developed to measure them are presented
Forward neutrino fluxes at the LHC
With the upcoming Run 3 of the LHC, the FASERν and SND@LHC detectors will start a new era of neutrino physics using the far-forward high-energy neutrino beam produced in collisions at ATLAS. This emerging LHC neutrino physics program requires reliable estimates of the LHC’s forward neutrino fluxes and their uncertainties. In this paper, we provide a new fast-neutrino flux simulation, implemented as a RIVET module, to address this issue. We present the expected energy distributions going through the FASERν and SND@LHC detectors based on various commonly used event generators, analyze the origin of those neutrinos, and present the expected neutrino event rates.With the upcoming Run 3 of the LHC, the FASERv and SND@LHC detectors will start a new era of neutrino physics using the far-forward high-energy neutrino beam produced in collisions at ATLAS. This emerging LHC neutrino physics program requires reliable estimates of the LHC's forward neutrino fluxes and their uncertainties. In this paper we provide a new fast-neutrino flux simulation, implemented as a RIVET module, to address this issue. We present the expected energy distributions going through the FASERv and SND@LHC detectors based on various commonly used event generators, analyze the origin of those neutrinos, and present the expected neutrino event rates
First Studies of Ion Collimation for the LHC Using BDSIM
At the Large Hadron Collider (LHC) at CERN ion physics runs are performed in addition to proton physics runs. In ion operation the cleaning efficiency of the collimation system is lower than in the case of protons and the ion showering process is more complicated and produces a larger variety of secondary particles. In particular, lighter ion species can be produced as fragmentation products in the collimation system and specialised physics lists are required to simulate their production and propagation in matter. The Geant4 toolkit offers comprehensive physics process lists that extend to the case of arbitrary ion species at high energies. First results from a study of ion collimation for the LHC using the Geant4 physics library in BDSIM are presented here. These include simulations of a full ring loss map and particle spectra for collimator leakage for a Pb beam at injection energy in the LHC
Results from the laser-wire at ATF2 and development of a fibre laser for its upgrade
The commissioning and development of a laser-wire transverse electron beam profile monitor at the Accelerator Test Facility 2 in Japan is presented. The experimental setup used including a gigawatt laser system is detailed and characterised. Results from data taking in December 2010 are presented detailing the use of the laser-wire to tune the electron beam. In conjunction with this, the use of a fibre-based laser system as a suitable laser source for a laser-wire is discussed. A test bed fibre laser system was constructed to investigate the suitability of fibre lasers and the results are presented demonstrating high efficiency and excellent spatial quality. From this, a laser system capable of high resolution and high repetition intra-train scanning for demonstration at the Accelerator Test Facility 2 was designed, constructed and characterised. A commercial fibre laser system was extended using a photonic crystal fibre where periodic amplification designed to match the duty cycle of an accelerator was used advantageously to achieve higher than normal pulse energies. The results and techniques developed to measure them are presented.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Possible operational scenarios for a quasi-simultaneous operation of proton and ion beams in the North Area Experimental Areas
The implications of the experimental proposals for ion operation in the North Area post-LS3 are being studied within the framework of the Physics Beyond Colliders framework in collaboration with an ATS Future Ions Working Group established with the mandate to study possibilities and limitations of the CERN injector complex for delivering ions to the SPS experimental areas and the LHC post-LS3. This document describes three conceptual scenarios for "quasi-simultaneous" operation of protons and ions slowly extracted towards the North Area beam lines as a possible mean to optimize the overall beam delivery to the NA experiments. All these scenarios need to be checked against all accident scenarios in a dedicated risk assessment and the overall gain of such an investment to be weighted versus simple time-sharing of the two different modes
Investigation of CLIC 380 GeV post-collision line
It has been proposed that the Compact Linear Collider (CLIC) be commissioned in stages, starting with a lower-energy, 380 GeV version for the first stage, and concluding with a 3 TeV version for the final stage. In the Conceptual Design Report (CDR) [1] published in 2012, the post-collision line is described for the 3 TeV and 500 GeV stages. However, the post-collision line for the 380 GeV design was not investigated. This work will describe the simulation studies performed in BDSIM [2] for the 380 GeV post-collision line