Keyword: database
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MOPML033 Data Supply of Accelerator Devices - Data Management of Device Process Data at a Medical Accelerator controls, operation, MMI, linac 477
  • M. Galonska, R. Cee, Th. Haberer, K. Höppner, J.M. Mosthaf, A. Peters, S. Scheloske, C. Schömers
    HIT, Heidelberg, Germany
  HIT is the first dedicated proton and carbon cancer therapy facility in Europe. It uses the full 3D intensity controlled raster scanning dose delivery method of pencil beams with ion beams of 48 - 430 MeV/u provided by a linac-synchrotron-system. Ion beams in this wide range of energies, different beam sizes, and intensities have to be provided by the control system to all treatment rooms at any time with high accuracy, stability, and reproducibility. This paper briefly reflects some aspects of the data supply, i. e. the settings of accelerator devices at a medical accelerator. This includes the generation of control data, storage, and data recovery routines, which have been developed at HIT in the recent years. That is in particular the management of verified therapy data and settings, which are stored in a non-volatile memory of the device controllers, and – as a backup – in a database and which are protected against unintended changes for safety reasons.  
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WEPAF013 Database for the Management of NSLS-II Active Interlock System interface, synchrotron, MMI, storage-ring 1841
  • J. Choi, R.P. Fliller, K. Ha, Y. Tian
    BNL, Upton, Long Island, New York, USA
  Funding: DOE Contract No. DE-SC0012704
NSLS-II is operating the active interlock (AI) system to protect the machine components from the synchrotron radiation from the accidentally mis-steered electron beam. For the systematic management, a relational database is dedicated to the AI system and working as the data provider as well as the archiver. The paper shows how the database is structured and used for the AI system.
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WEPAF030 HEPS High-Level Software Architecture Plan software, controls, EPICS, operation 1884
  • C.P. Chu, Y.S. Qiao, C.H. Wang
    IHEP, Beijing, People's Republic of China
  • H.H. Lv
    SINAP, Shanghai, People's Republic of China
  Funding: Work supported by the Chinese Academy of Science and the HEPS-TF Project.
The High Energy Photon Source (HEPS) is a planned ultra-low emittance synchrotron radiation based light source which requires high precession control systems for both accelerator and beamlines. Such kind of accelerators will require extremely sophisticated high-level control software for both accelerator and beamline operation to achieve not only the demanded precision but also high reliability. This paper outlines the high-level application software architecture design including relational data-bases, software platforms, and advanced controls with machine learning (ML) techniques. Early plan for beam-line control is also reported. For better quality control and easy maintenance, the high-level applications will be built upon matured software platforms. Also, the HEPS High-Level Software team will collaborate with EPICS community for improving the software platforms.
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THPAK090 Symbolic Presentation of Nonlinear Dynamic Systems in Terms of Lego-Objects quadrupole, octupole, controls, dipole 3441
  • E. Sboeva, E. Krushinevskii
    Saint Petersburg State University, Saint Petersburg, Russia
  • S.N. Andrianov, A.N. Ivanov
    St. Petersburg State University, St. Petersburg, Russia
  In this paper we propose a symbolic representation of the solutions of the equations of evolution of dynamical systems in the framework of matrix formalism and Lie algebra for a number of elements of the accelerator (in particular, dipole, quadrupole and octupole) up to the 4th order. The considered solutions are Lego-objects*, which are include into the general scheme of the representation beam dynamics. It allows modeling of schemes of various accelerators and thereby to increasing performance of parametrical optimization. Let us note that the symbolic approach to solving such problems is more preferable than the numerical one, which is widely used. This leads to a reduction in the time and resources spent on solving optimization problems, as well as the ability to create universal Lego objects. The paper considers the verification of the obtained formulas from the experimental data. The corresponding Lego objects are the main components of the special software for both symbolic and numerical dynamics analysis. This software is planned to be used for modeling within the framework of the NICA accelerator project.
*S.N. Andrianov. Dynamic Modeling of Particle Beam Control Systems.
Saint Petersburg State University, 2002.
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THPML053 Computational Screening for Low Emittance Photocathodes electron, cathode, vacuum, emittance 4755
  • J.T. Paul, R.G. Hennig
    University of Florida, Gainesville, Florida, USA
  • I.V. Bazarov, A. Galdi
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • S.S. Karkare, H.A. Padmore
    LBNL, Berkeley, California, USA
  The majority of photocathode materials in use in accelerator applications have been discovered empirically through trial and error with little guidance from material science calculations. Alternatively, one can envision a process which is heavily guided by computational search using latest advances in density functional theory (DFT). In this work, the MaterialsProject database is searched for potential single crystal photocathodes that would be suitable for ultralow emittance beam production. The materials in the database are initially screened on the basis of experimental practicality. Following this, the expected emittance is calculated from the DFT computed band structures for the pre-screened materials using the conservation of energy and transverse momentum during photoemission. Based on such computational screening, we provide a list of potential low emittance photocathode materials which can be investigated experimentally as high brightness electron sources.  
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THPML136 Study of Secondary Electron Generation and Transport in Diamond electron, simulation, scattering, cathode 5004
  • T.L. He, K. Huang, Z.L. Ren, L. Wang, D.R. Xu, H. Xu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  Energetic primary electrons (~ keV) impinging on the diamond film with its both surface under bias field in ~ MV/m, will excite secondary electron (SE) response including SE generation & transport. Although there have been 3D Monte Carlo (MC) simulation to study the two processes, this paper will introduce another method. Based on optical dielectric model, 3D MC simulation was implemented to study the generation process, and SE generation function was obtained by fitting the calculations. Using this function, the diffusion-drift equation of charge carriers (electron and hole) can be solved in 1D for the transport process, and the variation of SE depth distribution with time can be obtained.  
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