Keyword: software
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MOPG12 A Wire-Based Methodology to Analyse the Nanometric Resolution of an RF Cavity BPM cavity, experiment, alignment, dipole 63
  • S. Zorzetti, K. Artoos, F.N. Morel, P. Novotny, D. Tshilumba, M. Wendt
    CERN, Geneva, Switzerland
  • L. Fanucci
    Università di Pisa, Pisa, Italy
  Funding: The PACMAN project is funded by the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 606839
Resonant Cavity Beam Position Monitors (RF-BPMs) are diagnostic instruments capable of achieving beam position resolutions down to the nanometre scale. To date, their nanometric resolution capabilities have been predicted by simulation and verified through beam-based measurements with particle beams. In the frame of the PACMAN project at CERN, an innovative methodology has been developed to directly observe signal variations corresponding to nanometric displacements of the BPM cavity with respect to a conductive stretched wire. The cavity BPM of this R&D study operates at the TM110 dipole mode frequency of 15GHz. The concepts and details of the RF stretched wire BPM test-bench to achieve the best resolution results are presented, along with the required control hardware and software.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG12  
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MOPG19 Diamond Monitor Based Beam Loss Measurements in the LHC detector, injection, instrumentation, data-acquisition 82
  • C. Xu, B. Dehning, F.S. Domingues Sousa
    CERN, Geneva, Switzerland
  • E. Griesmayer
    CIVIDEC Instrumentation, Wien, Austria
  Two pCVD diamond based beam loss monitors (dBLM) are installed near the primary collimators of the LHC, with a dedicated, commercial readout-system used to acquire their signals. The system is simultaneously able to produce a high sampling rate waveform and provide a real-time beam loss histogram for all bunches in the machine. This paper presents the data measured by the dBLM system during LHC beam operation in 2016.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG19  
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MOPG65 Frascati Beam-Test Facility (BTF) High Resolution Beam Spot Diagnostics detector, electron, real-time, diagnostics 221
  • P. Valente
    INFN-Roma, Roma, Italy
  • B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
    INFN/LNF, Frascati (Roma), Italy
  Funding: Istituto Nazionale di Fisica Nucleare. Supported by the H2020 project AIDA-2020, GA no. 654168
The DAΦNE Beam Test Facility (BTF) is operational in Frascati since 2003. In the last years the beam diagnostics tools have been completely renewed and the services for users have been largely improved. We describe here the new transverse beam diagnostics based on new GEM TPC detectors and MEDIPIX Silicon pixel detectors, the renewed DAQ system and the data caching system based on MEMCACHED and the integration of the new sub-systems in the new data-logging. Results on the optimization of the transverse beam spot and divergence are reported as well as the real-time diagnostics and feedback user experience.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG65  
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TUPG23 Use CR-39 Plastic Dosimeters for Beam Ion Halo Measurements detector, proton, linac, diagnostics 376
  • I. Eliyahu, A. Cohen, E. Daniely, B. Kaizer, A. Kreisler, A. Perry, A. Shor, L. Weissman
    Soreq NRC, Yavne, Israel
  Beam halo and growth of beam emittance are important issues for high-intensity linear accelerators. Beam-dynamic predictions of weak beam tails are usually not reliable due to complexity of the non-linear effects leading to halo formation. Therefore, development of a simple method for beam halo diagnostics is highly desirable. The first testing of CR-39 solid-state nuclear track dosimeters for beam halo measurement were performed at the SARAF phase I accelerator with a few MeV proton beams. Beam pulses of 90 nA peak intensity of shortest possible duration (15 ns) were used for direct irradiation of standard CR-39 personal dosimetry tags. Other irradiations were done with beam pulses of 200 ns duration and of 1 mA peak intensity. Specially prepared large area CR-39 plates with central hole for the beam core transport were used in these tests. Weak beam structures were clearly observed in the both types of irradiation. The tests showed feasibility of beam halo measurements down to resolution level of a single proton. The optimum CR-39 etching conditions were established. The advantages and drawback of the method are discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG23  
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TUPG30 Testing the Untestable: A Realistic Vision of Fearlessly Testing (Almost) Every Single Accelerator Component Without Beam and Continuous Deployment Thereof hardware, operation, simulation, luminosity 399
  • A. Calia, K. Fuchsberger, M. Hostettler
    CERN, Geneva, Switzerland
  Whenever a bug of some piece of software or hardware stops beam operation, loss of time is rarely negligible and the cost (either in lost luminosity or real financial one) might be significant. Optimization of the accelerator availability is a strong motivation to avoid such kind of issues. Still, even at large accelerator labs like CERN, release cycles of many accelerator components are managed in a "deploy and pray" manner. In this paper we will give a short general overview on testing strategies used commonly in software development projects and illustrate their application on accelerator components, both hardware and software. Finally, several examples of CERN systems will be shown on which these techniques were or will be applied (LHC Beam-Based Feedbacks and LHC Luminosity Server) and describe why it is worth doing so.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG30  
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TUPG32 Blip Scanning System Power Supply Control feedback, target, impedance, controls 406
  • Z. Altinbas, R.F. Lambiase, C. Theisen
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Dept. of Energy.
In the Brookhaven LINAC Isotope Producer (BLIP) facility, a fixed target is bombarded by proton beam to produce isotopes for medical research and cancer treatment. This bombardment process causes spot heating on the target and reduces its lifetime. To mitigate this problem, an upgrade to the beamline has been made by spreading the beam on the target in a circular pattern, which allows the target to heat more uniformly. The beam is steered in a circular pattern by a magnet with orthogonal (X and Y) windings. Each of these two windings is independently powered as part of a resonant circuit driven by a power amplifier. This paper describes the hardware platform used as well as the software implementation of the resonant circuit design and its feedback loops.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG32  
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TUPG41 Development of High Resolution Beam Current Measurement System for COSY-Jülich experiment, hardware, Ethernet, instrumentation 434
  • Y. Valdau, S. Mikirtytchiants, S. Trusov
    FZJ, Jülich, Germany
  • L. Eltcov
    Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany
  • P. Wuestner
    Forschungszentrum Jülich, Jülich, Germany
  An experiment to test the Time Reversal Invariance at COSY (TRIC) is under the preparation at the Forschungszentrum Jülich. This experiment requires a precise measurement of the beam life time. A high resolution beam current measurement system, based on Fast Current Transformer (FCT), is under the development for the COSY storage ring. The signal from the FCT is measured by a modern lock-in amplifier which is read out by a dedicated DAQ over an Ethernet. Additional instruments, equipped with Ethernet interface, can be implemented into this DAQ and read out synchronously with other systems necessary for the TRIC experiment. Relative resolution of 10-4, sufficient for the TRIC experiment, has been demonstrated at the test bench in the laboratory. Preliminary results of the system commissioning at COSY will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG41  
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TUPG45 The CERN Beam Instrumentation Group Offline Analysis Framework framework, instrumentation, database, extraction 449
  • B. Kolad, J-J. Gras, S. Jackson, S.B. Pedersen
    CERN, Geneva, Switzerland
  Beam instrumentation systems at CERN require periodic verifications of both their state and condition. Presently, experts have no generic solution to observe and analyse an instrument's condition and as a result, many ad-hoc Python scripts have been developed to extract historical data from CERN's logging service. Clearly, ad-hoc developments are not desirable for medium/long term maintenance reasons and therefore a generic solution has been developed. In this paper we present the Offline Analysis Framework (OAF), used for automatic report generation based on data from the central logging service. OAF is a Java / Python based tool which allows generic analysis of any instrument's data extracted from the database. In addition to the generic analysis, advanced analysis can also be performed by providing custom Python code. This paper will explain the steps of the analysis, its scope and present the kind of reports that are generated and how instrumentation experts can benefit from it. We will also show how this approach simplifies debugging, allows code re-use and optimises database and CPU resource usage.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG45  
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WEAL03 Diagnostic Data Acquisition Strategies at FRIB diagnostics, hardware, FPGA, data-acquisition 572
  • S. Cogan, S.M. Lidia, R.C. Webber
    FRIB, East Lansing, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
Strategies for data acquisition and processing will be discussed in the context of the Facility for Rare Isotope Beams (FRIB). Design decisions include selecting and designing electronics hardware, data acquisition cards, firmware design, and how to integrate with EPICS control system. With over 300 diagnostic devices and 16 unique types of devices, timing for synchronous data acquisition is important. Strategies to accelerate development as well as reduce maintenance requirements will be dis-cussed, including using common hardware and firmware whenever possible, and defining a common data report-ing structure for use by most devices. MicroTCA.4 plat-form is used to integrate data acquisition cards, distribute timing information, and machine protection signals.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEAL03  
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WEPG01 Numerical Comparative Study of BPM Designs for the HESR at FAIR pick-up, simulation, emittance, monitoring 608
  • A.J. Halama, C. Böhme, V. Kamerdzhiev, F. Klehr, S. Srinivasan
    FZJ, Jülich, Germany
  The institute of Nuclear Physics 4(IKP-4) of the Research Center Jülich (FZJ) is in charge of building and commissioning the High Energy Storage Ring (HESR) within the international Facility for Antiproton and Ion Research (FAIR) at Darmstadt. Simulations and numerical calculations were performed to characterize the BPM pickup design that is currently envisaged for the HESR, i.e. a diagonally cut cylindrical pickup. The equivalent circuit has been studied with emphasis on capacitive cross coupling. Based on our findings, performance increasing changes could be introduced. A prototype BPM was constructed and tested on a test bench. A comparison of results is presented. Another proposed design was characterized, as a symmetric coupling behavior is expected. That is a symmetrical straight four-strip geometry. Additionally an extensive study was conducted to see effects due to manufacturing tolerances. Driven by curiosity an eight-strip design was considered, which would allow for beam size measurements. First results for this configuration are shown. Used methodology, tools and results of expected signal level and sensitivity distributions are presented as well.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG01  
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WEPG12 A Versatile BPM Signal Processing System Based on the Xilinx Zynq SoC electron, ion, hardware, electronics 646
  • R.L. Hulsart, P. Cerniglia, N.M. Day, R.J. Michnoff, Z. Sorrell
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A new BPM electronics module (V301) has been developed at BNL that uses the latest System on a Chip (SoC) technologies to provide a system with better performance and lower cost per module than before. The future of RHIC ion runs will include new RF conditions as well as a wider dynamic range in intensity. Plans for the use of electron beams, both in ion cooling applications and a future electron-ion collider, have also driven this architecture toward a highly configurable approach. The RF input section has been designed such that jumpers can be changed to allow a single board to provide ion or electron optimized analog filtering. These channels are sampled with four 14-bit 400MSPS A/D converters. The SoC's ARM processor allows a Linux OS to run directly on the module along with a controls system software interface. The FPGA is used to process samples from the ADCs and perform position calculations. A suite of peripherals including dual Ethernet ports, uSD storage, and an interface to the RHIC timing system are also included. A second revision board which includes ultra-low jitter ADC clock synthesis and distribution and improved power supplies is currently being commissioned.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG12  
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WEPG73 A Hardware and Software Overview on the New BTF Transverse Profile Monitor detector, timing, linac, positron 818
  • B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
    INFN/LNF, Frascati (Roma), Italy
  • P. Valente
    INFN-Roma, Roma, Italy
  Funding: Supported by the H2020 project AIDA-2020, GA no. 654168
In the last 11 years, the Beam-Test Facility (BTF) of the DAΦNE accelerator complex, in the Frascati laboratory, has gained an important role in the EU infrastructures devoted to the development of particle detectors. The facility can provide runtime tuneable electrons and positrons beams in a range of different parameters: energy (up to 750 MeV for e- and 540 MeV for e+), charge ( up to 1010 e /bunch) and pulse length (1.4-40 ns). The bunch delivering rate is up to 49 Hz and the beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad, in order to achieve user needs. In these paper we are going to describe the new implementation of the secondary BTF beam transverse monitor systems based on WIDEPIX FITPIX detectors, operating in bus synchronization mode externally timed to BTF beams. Our software layout includes a data producer, a live-data display consumer and a MEMCACHED caching server. This configuration offers to BTF users a vary fast approach to the transverse data using TCP/IP calls to MEMCACHED with an easy and fast software integration on users DAQ. The data packing permits also to avoid the needs of mixed (user vs BTF) hardware synchronization.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG73  
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