Keyword: factory
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MOPV027 The Evolution of the DOOCS C++ Code Base controls, MMI, network, interface 188
  • L. Fröhlich, A. Aghababyan, S. Grunewald, O. Hensler, U. Jastrow, R. Kammering, H. Keller, V. Kocharyan, M. Mommertz, F. Peters, A. Petrosyan, G. Petrosyan, L.P. Petrosyan, V. Petrosyan, K. Rehlich, V. Rybnikov, G. Schlesselmann, J. Wilgen, T. Wilksen
    DESY, Hamburg, Germany
  This contribution traces the development of DESY’s control system DOOCS from its origins in 1992 to its current state as the backbone of the European XFEL and FLASH accelerators and of the future Petra IV light source. Some details of the continual modernization and refactoring efforts on the 1.5 million line C++ codebase are highlighted.  
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About • Received ※ 14 October 2021       Accepted ※ 21 December 2021       Issue date ※ 07 March 2022  
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MOPV036 Porting Control System Software From Python 2 to 3 - Challenges and Lessons software, controls, operation, MMI 217
  • A.F. Joubert, M.T. Ockards, S. Wai
    SARAO, Cape Town, South Africa
  Obsolescence is one of the challenges facing all long-term projects. It not only affects hardware platforms, but also software. Python 2.x reached official End Of Life status on 1 January 2020. In this paper we review our efforts to port to the replacement, Python 3.x. While the two versions are very similar, there are important differences which can lead to incompatibility or changes in behaviour. We discuss our motivation and strategy for porting our code base of approximately 200 k source lines of code over 20 Python packages. This includes aspects such as internal and external dependencies, legacy and proprietary software that cannot be easily ported, testing and verification, and why we selected a phased approach rather than "big bang". We also report on the challenges and lessons learnt - notably why good test coverage is so important for software maintenance. Our application is the 64-antenna MeerKAT radio telescope in South Africa - a precursor to the Square Kilometre Array  
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About • Received ※ 11 October 2021       Accepted ※ 04 February 2022       Issue date ※ 03 March 2022  
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WEPV013 Design of Magnet Measurement System Based on Multi-Hall Sensor controls, feedback, site, power-supply 653
  • B.J. Wang, Y.H. Guo, R. Wang, N. Xie
    IMP/CAS, Lanzhou, People’s Republic of China
  High-precision magnetic field measurement and control technique significantly guarantees the accurate realization of the magnetic confinement of accelerators. Using real-time magnetic field intensity as the feedback to adjust the magnetic field current input can be a promising strategy. However, the measurement accuracy of the Hall-sensor is hard to meet feedback requirements because of multiple affection from external factors. Meanwhile, the NMR(Nuclear Magnetic Resonance sensor), which can provide high-precision magnetic field measurement, can hardly meet the requirements against the real-time control due to its strict requirements on the uniformity of the measured magnetic field, as well as its low data acquisition speed. Therefore, a magnetic field measurement system based on multi-Hall sensors is designed to solve this problem. Four Hall-sensors are used to measure the target magnetic field in this system. An Adaptive fusion algorithm is used to fused collected values to obtain the best estimate of the magnetic field intensity. This system effectively improves the accuracy of magnetic field measurement and ensures the instantaneity of the measurement.  
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About • Received ※ 09 October 2021       Revised ※ 22 October 2021       Accepted ※ 21 November 2021       Issue date ※ 06 December 2021
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WEPV038 Performance Verification of New Machine Protection System Prototype for RIKEN RI Beam Factory FPGA, controls, PLC, operation 742
  • M. Komiyama, M. Fujimaki, N. Fukunishi, K. Kumagai, A. Uchiyama
    RIKEN Nishina Center, Wako, Japan
  • M. Hamanaka, T. Nakamura
    SHI Accelerator Service Ltd., Tokyo, Japan
  We report on performance verification of a prototype of a new machine protection system for the RIKEN Radioactive Isotope Beam Factory (RIBF). This prototype was developed to update a beam interlock system (BIS) in operation since 2006. The new system, like the BIS, is configured using a programmable logic controller (PLC). We applied the prototype to a small part of RIBF and started its operation in Sept., 2020. It consists of two separate PLC stations, and there are 28 digital inputs and 23 analog inputs as interlock signals, and 5 digital outputs are used to stop a beam in total. The observed response time averaged 2 ms and 5.7 ms, respectively, within one station and with both stations. When deploying the prototype in the same scale as the BIS, which consists of 5 PLC stations with roughly 400 signals, the response time is estimated to be over 10 ms, which means that it is too long to protect the equipment when the intensity of the beam accelerated at RIBF becomes higher. Therefore, we are starting to redesign a system by adding a field-programmable gate array (FPGA) to shorten the response time significantly rather than repeating minor improvements to save a few milliseconds.  
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About • Received ※ 10 October 2021       Accepted ※ 21 November 2021       Issue date ※ 24 January 2022  
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