14th International Computational Accelerator Physics Conference

The beam longitudinal dynamics code BLonD is a framework developed in the RF group at CERN since 2014. It has emerged as a central tool for performing particle tracking simulations in the longitudinal plane in synchrotrons. This talk covers several applications for existing accelerator facilities (e.g., Proton Synchrotron Booster, Large Hadron Collider, etc.) and future projects. The main code...

High-order transfer maps offer many advantages in the study of both single-pass systems, where they represent optical aberrations, and multi-pass systems, where they allow the direct computation of relevant properties like high-order dispersions, chromaticities, and amplitude- and parameter dependent tune shifts. They also allow for symplectic tracking even for very complicated systems that...

Slow beam losses have been consistently observed during operation of the Large Hadron Collider (LHC) with closely-spaced proton bunches. Observations after dedicated studies support that a significant part of the losses is driven by the non-linear forces of electron clouds in the Inner Triplet quadrupoles of the LHC. This contribution presents a method for efficient weak-strong simulations of...

The nonlinear space-charge effects play an important role in
high intensity high brightness particle accelerators.
In this talk, we will report on progress in modeling space-charge
effects in recent years.
We will discuss about simulating the space-charge effects using
a quantum Schrodinger approach and possible implementation on
quantum computers. We will also discuss differentiable...

CERN has recently launched the Efficient Particle Accelerators (EPA) project to enhance the reliability, efficiency, and beam performance of its injector complex. Over the next five years, both classical automation concepts and advanced machine learning (ML) techniques will be pivotal in achieving the project's goals. This talk will provide a brief overview of the EPA project scope and CERN’s...

Fourth-generation synchrotron light sources enable orders-of-magnitude increases in beam brightness and corresponding X-ray source flux. Operating these machines at such high energy densities necessitates improvements in machine protection systems, as equipment failures may trigger beam aborts capable of depositing significant energy in collimators and beam dumps. We present a code coupling...

Model and computation of photoionization of negative hydrogen ion by using strong laser is considered. The method of H- photoionization is interesting for laser assisted charge exchange injection project. In this paper we develop calculation of high efficiency photoionization through time dependent wave equation with application of powerful lasers that has nonlinear effects compared to...

A simulation workflow has been developed to study dark current (DC) radiation effects using ACE3P and Geant4. The integrated workflow interfaces particle data transfer and geometry between the electromagnetic (EM) cavity simulation code ACE3P and the radiation code Geant4, targeting large-scale problems using high-performance computing. The process begins by calculating the operating mode in...

Design parameters in accelerator projects are frequently subject to change, necessitating repeated optimisation and calculation of various figures of merit, along with updating plots and tables, which can be time-consuming. In the context of designing superconducting radiofrequency (SRF) cavity geometries, these tasks typically involve eigenmode and wakefield simulations and occasionally...

PyORBIT is a Partice-in-Cell simulation code widely used in the accelerator community. We have developed accelerator simulation software that includes EPICS and runs PyORBIT as its physics model. This PyORBIT virtual accelerator is currently in use as a digital twin for developing Control Room software, training and testing Machine Learning models, and training operators at the Spallation...

In this study, we introduce a novel application of data-driven Model Predictive Control (MPC) to enhance the multi-turn injection (MTI) process within the SIS18 synchrotron, diverging from traditional numerical optimization techniques our approach epitomizes a sample-efficient strategy that resides at the confluence of model-based reinforcement learning and advanced control theory. This...

Ultrashort bunch length measurements are essential in modern accelerator experiments like high-gradient plasma-based accelerators and free electron lasers. These require quality electron bunches in the femtosecond-length scale and thus pose significant challenges for developing novel beam instrumentation and diagnostics. This contribution presents current results on the development of a...

The development of ultra-low emittance storage rings, such as the e+/e- Future Circular Collider (FCC-ee) with a circumference of about 90 km, aims to achieve unprecedented luminosity and beam size. One significant challenge is correcting the optics, which becomes increasingly difficult as we target lower emittances. The use of stronger quadrupoles and sextupoles makes these machines...

The SNS Beam Test Facility is equipped with advanced phase space diagnostics that enable very detailed characterization of beam distributions at the beginning and end of a test beamline. I show the latest results in benchmarking with PyORBIT after a significant reconfiguration of the beamline. I will discuss on-going efforts to improve the simulation accuracy, with implications for modeling of...

Laser-wake field accelerators (LWFAs) are potential candidates to produce intense relativistic electron beams to drive compact free electron lasers (FELs) in VUV and X-ray regions. The High-Field Physics and Ultrafast Technology Laboratory at National Central University (NCU) is actively developing a compact LWFA-based high gain harmonic generation (HGHG) FEL aimed at coherent extreme...

The International Muon Collider Collaboration (IMCC) is engaged in a design study for a future facility intended for the collision of muons.Subsequent to the initial linear acceleration, the counter-rotating muons and anti-muons are accelerated in a chain of rapid cycling synchrotrons (RCS) up to the multi-TeV collision energy. To maximise the number of muons available in the collider, it is...

Storage rings based on the integrable optics concept, such as the Integrable Optics Test Accelerator (IOTA) at Fermilab, pose several challenges to effective numerical modeling due to the complex, nonperturbative structure of the nonlinear dynamics and (for operation with protons) the interplay with high-intensity space charge. A primary modeling goal is to ensure symplectic treatment of both...

Machine learning has emerged as a powerful solution to the modern challenges in accelerator physics. However, the limited availability of beam time and the high computational cost of simulation codes pose significant hurdles in generating the necessary data for training state-of-the-art machine learning models. Furthermore, optimisation methods can be used to tune accelerators and perform...

The Muon $g\textrm{-}2$ Experiment (E989) at Fermilab conducted high-precision measurements of the muon anomalous magnetic moment $a_\mu$ using a storage ring from 2018 to 2023, achieving a remarkable precision of $0.20\:\mathrm{ppm}$ over Runs 1-3, with analyses for Runs 4-6 ongoing. A comprehensive understanding of the storage ring's beam dynamics and its accurate simulations are crucial for...

The projected SIS-100 synchrotron at FAIR will provide heavy ion beams
for many different user experiments. Most of these experiments will require
beams from slow extraction. Slow extraction is mainly characterized by the
amount of uncontrolled beam losses and temporal microscopic structures on the
extracted beam also referred to as spill. For both characteristics, predictions
are...

The Muon $g\textrm{-}2$ Experiment (E989) at Fermilab aims to measure the muon anomalous magnetic moment $a_{\mu}$ with unprecedented precision, potentially uncovering physics beyond the Standard Model of particle physics. The result based on Runs 1-3, released in 2023, achieved a precision of $0.20\:\mathrm{ppm}$. The experiment circulates muons in a storage ring, measuring $a_{\mu}$ from...

The system under investigation is an infinite plasma column surrounded by a perfect conducting cylindrical wall and space charge fields govern the motion of the particles. Additionally, the drift-kinetic approximation is valid which allows to track just the drift centers of the particles. Commonly, perturbations of the equilibrium space charge field are decomposed into modes. Driving those...

Intense THz radiation has found critical applications in the study of quantum and semiconductor materials, as well as in the manipulation of electron beams. In response to this, a THz Free Electron Laser (FEL) facility has been developed at NSRRC, designed to deliver high peak power for user operations. This facility generates coherent radiation within the 0.6 to 1.4 THz frequency range. The...

We will discuss the modeling and simulation of intrabeam scattering (IBS) in single pass electron injectors. This effect is well known and thoroughly investigated for circular machines and storage rings. Recently, however, concerns have been raised regarding the IBS induced growth of uncorrelated energy spread in electron linacs for coherent light sources. In particular, the IBS effect in the...

In this research, we present a detailed electromagnetic characterization and optimization study of nanostructured photocathodes for electron gun applications. The study concentrates on photocathodes operated at visible to infrared wavelengths, for which an accurate simulation model is constructed. For this, we apply a customized dispersion model for the cathode material, which can describe the...

In the injector section of electron linacs, both internal space charge forces and wake field effects influence the beam dynamics. Full electromagnetic PIC codes solving for the full set of particle motion and Maxwell’s equations require too high computational effort for practical applications.
On the other hand, conventional space charge solvers neglect transient EM waves, while wake field...

The DA methods employed in COSY allow for the computation of arbitrary order transfer maps. The derivation and antiderivation operations of the differential algebraic structure allow the construction of map integrators based on either Picard iteration or directional derivates that are significantly more efficient than conventional integrators. The tools also allow the automatic computation of...

Advances in fidelity and performance of accelerator modeling tools, in tandem with novel machine learning capabilities, has prompted community initiatives aiming to realize “virtual test stands” that can serve as true analogues to physical machines. Such efforts require integrated, end-to-end modeling capabilities with support for parametric optimization and benchmarking. We present the...