| 1. |
- Arredondo, I., et al.
(författare)
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Adjustable ECR Ion Source Control System: Ion Source Hydrogen Positive Project
- 2015
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Ingår i: IEEE Transactions on Nuclear Science. - 0018-9499. ; 62:3, s. 903-910
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Tidskriftsartikel (refereegranskat)abstract
- ISHP (Ion Source Hydrogen Positive) project consists of a highly versatile ECR type ion source. It has been built for several purposes, on the one hand, to serve as a workbench to test accelerator related technologies and validate in-house made developments, at the first stages. On the other hand, to design an ion source valid as the first step in an actual LINAC. Since this paper is focused on the control system of ISHP, besides the ion source, all the hardware and its control architecture is presented. Nowadays the ion source is able to generate a pulse of positive ions of Hydrogen from 2 mu s to a few range with a repetition rate ranging from 1 Hz to 50 Hz with a maximum of 45 mA of current. Furthermore, the first experiments with White Rabbit (WR) synchronization system are presented.
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| 2. |
- Friedrich, Thilo, et al.
(författare)
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An Integration Strategy for Controls and Computing Systems at a large Particle Accelerator based Research Facility
- 2016
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Ingår i: 2016 11TH SYSTEMS OF SYSTEM ENGINEERING CONFERENCE (SOSE), IEEE. - : IEEE. - 9781467387279
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Konferensbidrag (refereegranskat)abstract
- This paper presents a novel approach for the elaboration of an integration strategy for controls and computing systems at large particle accelerator based research facilities. The approach is applied in a specific case study conducted at the world-leading neutron science facility European Spallation Source (ESS). First, an introduction to the term 'integration' in the Systems Engineering literature is presented. Also, the common integration practices and challenges in the domain of controls and computing systems for particle accelerators are described. An approach for the elaboration of an integration strategy is proposed. It is based on the information needs for successful integration in this domain. The approach has been applied to a case study and the first preliminary results are shown. Systems-of-systems (SoS) characteristics of the case study are outlined. A discussion and evaluation of the result from the case study and the applied research methodology conclude the paper.
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| 3. |
- Jugo, J., et al.
(författare)
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Design and Performance Analysis of a Nonstandard EPICS Fast Controller
- 2015
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Ingår i: IEEE Transactions on Nuclear Science. - 0018-9499. ; 62:3, s. 889-896
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Tidskriftsartikel (refereegranskat)abstract
- Large scientific projects present new technological challenges, such as the distributed control over a communication network. In particular, the middleware Experimental Physics and Industrial Control System (EPICS) is the most extended communication standard in particle accelerators. The integration of modern control architectures in these EPICS networks is becoming common, as for example for the PXI/PXIe and xTCA hardware alternatives. In this paper, a different integration procedure for PXI/PXIe real-time controllers from National Instruments is proposed, using LabVIEW as the design tool. This methodology is considered and its performance is analyzed by means of a set of laboratory experiments. This control architecture is proposed for achieving the implementation requirements of fast controllers, which need an important amount of computational power and signal processing capability, with a tight real-time demand. The present paper studies the advantages and drawbacks of this methodology and presents its comprehensive evaluation by means of a laboratory test bench, designed for the application of systematic tests. These tests compare the proposed fast controller performance with a similar system implemented using an standard EPICS IOC provided by the CODAC system.
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| 4. |
- Piso Fernandez, Daniel, et al.
(författare)
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A New Rounding Method Based on Parallel Remainder Estimation for Goldschmidt and Newton-Raphson Algorithms
- 2014
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Ingår i: 2014 17th Euromicro Conference on Digital System Design (Dsd). ; , s. 639-642
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Konferensbidrag (refereegranskat)abstract
- Newton-Raphson and Goldschmidt algorithms can be sped up by using variable latency hardware architectures for rounding division, square root and their reciprocals. A new approach based on a rounding method with remainder estimate calculated concurrently with the algorithm was proposed in [5]. This paper presents an study of the hardware implementation of this approach and shows that does not suppose additional latency and avoids conventional remainder calculation most of the times. By using a CMOS 90 nm technology library different hardware architectures are presented. The results show that the expected performance improvements are obtained with reasonable increments in area (up to 5.6%), critical path (up to 6.7%) and better power performance (up to -24%).
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| 5. |
- Villar, Xabier, et al.
(författare)
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FPGA Implementation of an Efficient Algorithm for the Calculation of Charged Particle Trajectories in Cosmic Ray Detectors
- 2014
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Ingår i: IEEE Transactions on Nuclear Science. - 0018-9499. ; 61:1, s. 590-595
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents an FPGA implementation of an algorithm, previously published, for the the reconstruction of cosmic rays' trajectories and the determination of the time of arrival and velocity of the particles. The accuracy and precision issues of the algorithm have been analyzed to propose a suitable implementation. Thus, a 32-bit fixed-point format has been used for the representation of the data values. Moreover, the dependencies among the different operations have been taken into account to obtain a highly parallel and efficient hardware implementation. The final hardware architecture requires 18 cycles to process every particle, and has been exhaustively simulated to validate all the design decisions. The architecture has been mapped over different commercial FPGAs, with a frequency of operation ranging from 300 MHz to 1.3 GHz, depending on the FPGA being used. Consequently, the number of particle trajectories processed per second is between 16 million and 72 million. The high number of particle trajectories calculated per second shows that the proposed FPGA implementation might be used also in high rate environments such as those found in particle and nuclear physics experiments.
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