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| WEPOR043 | End-to-end FEL Beam Stability Simulation Engine | 2768 |
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Funding: Work supported by U.S. Department of Energy During the design, commissioning and operation of a linac-driven Free Electron Laser (FEL) it is important to have a good understanding of the implications of accelerator design choices on beam figures of merit. This simulation engine combines a full state-space model of the RF system (High-Power Amplifier, RF cavities, LLRF controllers, etc.), a characterization of beam properties such as energy, bunch length and arrival time as electrons propagate through the Linac and beam-based feedback. The combination of these models with the ability to introduce both correlated and uncorrelated noise sources at any point of the machine, allows for a complete transposition of noise sources to beam performance parameters, including frequency dependence, in order to analyze implications of accelerator design choices in a simulation environment. |
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| WEPOR045 | PACMAN - the MedAustron Measurement Data Analysis Framework | 2774 |
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| During the commissioning of the synchrotron-based MedAustron accelerator facility, the analysis and interpretation of data of various sources was required. A dedicated framework was developed to analyze the raw data provided by the accelerator control system (ACS). A tested and documented software core with a simple and standardized interface allows also non-programming professionals to easily base their applications on this framework which is essential to efficiently make progress in the dynamic environment of commissioning. This document presents the structure of the framework, the interface between the software core and higher level applications and gives an example using all framework levels. | ||
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| WEPOR049 | Jupyterhub at the ESS. An Interactive Python Computing Environment for Scientists and Engineers | 2778 |
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| The European Spallation Source will be the world's most powerful neutron source, once its construction is finished. In order to design, build and operate this complex machine many different software components and frameworks will be needed. One of those is Jupyterhub, a scripting environment for data analysis, scientific computing and physics simulations. Jupyterhub is a multiuser version of the IPython notebook (Jupyter) that can be deployed in a centralized server; It provides centralized authentication, centralized deployment, promotes collaboration and provides access to the most advanced libraries for data cleaning and transformation, simulation and statistics. At the Integrated Controls System Division a customized version of Jupyterhub was deployed, providing sandboxed environments to users using Docker containers. Among other characteristics of this installation we can find: clustering, load balancing, A/B testing, Amazon Web Services integration, nbviewer and OpenXAL integration. | ||
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| WEPOR050 | How to Build and Maintain a Development Environment for the Development of Controls Software Applications: An Example of "Infrastructure as Code" within the Physics Accelerator Community. | 2781 |
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| The Integrated Control System Division (ICS) at the European Spallation Source (ESS) has the mandate to provide all the needed tools to ESS staff, in-kind contributors and consultants spread all over Europe, in order for them to build software for the commissioning and operation of the ESS. This includes EPICS applications, scripting environments, physics simulators and commissioning tools among others. ICS needs to provide support for new releases of the different software components, guaranteeing that the development environment of all the users can be properly updated. ICS needs to guarantee as well that environments can be reproducible and at the same time give the flexibility to users to own and customize their environments. ICS used a new virtualization technology (Vagrant) and a new configuration management system (Ansible) to provide a cutting edge development environment where all the software infrastructure can be described as code and properly stored in a version control system, tagged, tested, versioned and rollbacked if needed. | ||
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| WEPOR051 | Second Generation LHC Analysis Framework: Workload-based and User-oriented Solution | 2784 |
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| Consolidation and upgrades of accelerator equipment during the first long LHC shutdown period enabled particle collisions at energy levels almost twice higher compared to the first operational phase. Consequently, the software infrastructure providing vital information for machine operation and its optimisation needs to be updated to keep up with the challenges imposed by the increasing amount of collected data and the complexity of analysis. Current tools, designed more than a decade ago, have proven their reliability by significantly outperforming initially provisioned workloads, but are unable to scale efficiently to satisfy the growing needs of operators and hardware experts. In this paper we present our progress towards the development of a new workload-driven solution for LHC transient data analysis, based on identified user requirements. An initial setup and study of modern data storage and processing engines appropriate for the accelerator data analysis was conducted. First simulations of the proposed novel partitioning and replication approach, targeting a highly efficient service for heterogeneous analysis requests, were designed and performed. | ||
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| WEPOR052 | Emittance Measurements in Low Energy Storage Rings | 2788 |
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Funding: Work supported by the EU under grant agreement 624854 and the STFC Cockcroft Institute Core Grant No. ST/G008248/1. The development of the next generation of ultra-low energy antiproton and ion facilities requires precise information about the beam emittance to guarantee optimum performance. In the Extra-Low ENergy Antiproton storage ring (ELENA) the transverse emittances will be measured by scraping. However, this diagnostic measurements faces several challenges: non-zero dispersion and systematic errors due to diffusion processes, such as intra-beam scattering, and the speed of the scraper with respect to the beam revolution frequency. In addition, the beam distribution will likely be non-Gaussian. Here, we present algorithms to efficiently address the emittance reconstruction in presence of the above effects, and present simulation results for the case of ELENA. We also discuss the feasibility of using alternative non-invasive techniques for profile and emittance measurements. |
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| WEPOR053 | Software Tools for Emittance Measurement and Matching for 12 GeV CEBAF | 2792 |
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Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. This poster discusses model-driven setup of the Continuous Electron Beam Accelerator Facility (CEBAF) for the 12 GeV era, focusing on qsUtility. qsUtility is a set of software tools created to perform emittance measurements, analyze those measurements, and compute optics corrections based upon the measurements. qsUtility was developed as a toolset to facilitate reducing machine configuration time and reproducibility by way of an accurate accelerator model, and to provide Operations staff with tools to measure and correct machine optics with little or no assistance from optics experts. |
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| WEPOW055 | Bayesian Optimization of FEL Performance at LCLS | 2972 |
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Funding: Research is supported by the U.S. Department of Energy under Contract No. DE-AC02-76SF00515. The LCLS free-electron laser at SLAC is tuned via a huge number of parameters such as energy and magnet settings. Much of this tuning, including quadrupole magnet settings, is typically done by hand by the LCLS operators. In this paper we introduce an automated tuning system using Bayesian optimization, and describe its application to the optimization of noisy objectives such as FEL performance. We demonstrate with preliminary results from our implementation at LCLS that this system can improve both the speed of tuning procedures as well as the quality of the resulting solution. |
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| WEPOY043 | Plans for the European Spallation Source Beam Physics Control Software | 3086 |
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| The commissioning and operations planning for the European Spallation Source is currently being defined. It is foreseen that the ESS will begin to deliver beam on target by mid 2019, something which is urging a well structured and thought through plan both for commissioning and operations. In this paper we will discuss the plans for beam physics operational software, priorities and software services needed during the different stages of beam commissioning. | ||
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