IPAC2019 - List of Keywords (software)

Paper	Title	Other Keywords	Page
MOPGW080	Optics Measurements in the CERN PS Booster Using Turn-by-Turn BPM Data	optics, injection, MMI, booster	285
	A. Garcia-Tabares, P.K. Skowroński, R. Tomás CERN, Geneva, Switzerland A. Garcia-Tabares Universidad Complutense Madrid, Madrid, Spain
	As part of the LHC Injector Upgrade Project the injection of the CERN PS Booster will be changed to increase intensity and brightness of the delivered beams. The new injection scheme is likely to give rise to beta beating above the required level of 5\% and new measurements are required. Achieving accurate optics measurements in PSB lattice is a challenging task that has involved several improvements in both hardware and software. This paper summarizes all the improvements that have been performed in the optics measurement acquisition system together with a brief summary of the first results obtained.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW080
About •	paper received ※ 11 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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TUZZPLM1	Operational Results of LHC Collimator Alignment Using Machine Learning	alignment, injection, collimation, MMI	1208
	G. Azzopardi, A. Muscat, G. Valentino University of Malta, Information and Communication Technology, Msida, Malta S. Redaelli, B. Salvachua CERN, Geneva, Switzerland
	A complex collimation system is installed in the Large Hadron Collider to protect sensitive equipment from unavoidable beam losses. The collimators are positioned close to the beam in the form of a hierarchy, which is guaranteed by precisely aligning each collimator with a precision of a few tens of micrometers. During past years, collimator alignments were performed semi-automatically, such that collimation experts had to be present to oversee and control the alignment. In 2018, machine learning was introduced to develop a new fully-automatic alignment tool, which was used for collimator alignments throughout the year. This paper discusses how machine learning was used to automate the alignment, whilst focusing on the operational results obtained when testing the new software in the LHC. Automatically aligning the collimators decreased the alignment time at injection by a factor of three whilst maintaining the accuracy of the results. G.Valentino et al., "Semi-automatic beam-based LHC collimator alignment", PRSTAB, no.5, 2012.
	Slides TUZZPLM1 [6.060 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUZZPLM1
About •	paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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TUPMP023	Design of Digital Controller for Multi Module Series-parallel Accelerator Power Supply	power-supply, controls, simulation, hardware	1288
	J. Li, Y. Liu, X. Qi, W.Q. Zhang IHEP, Beijing, People’s Republic of China
	Funding: Supported by funds, Key laboratory of particle Acceleration Physics & Technology, Institute of High Energy Physics, Chinese Academy of Sciences，Project number：Y5294107TD With the development of accelerators, Accelerator physics require power supply output high voltage and current (Peak power reached MWs). And the current stability requirements better than 10ppm. Therefore, the power supply is mostly used in the mode of module series-parallel. However, during actual commissioning, the power supply often does not run at rated current. If the power supply is running at less than 30% of the rated current, the power output current stability will drop sharply. This topic designed a set of digital controller for multi-module serial-parallel control. The digital controller can automatically adjust the number of input modules according to the current setting, and can automatically allocate the required PWM number of the module. While taking into account the synchronization between the various modules, Ensure the power supply is always running at an optimal working condition. Through a special AD conversion hardware design and advanced closed-loop controller algorithm, the digital controller can provide up to 20 high-resolution PWM signals to drive power conversion devices.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP023
About •	paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP045	The Protection Instrument for Cryogenic Phase Separator Pressure Relief Valve of TPS Beamline	controls, monitoring, operation, cryogenics	1350
	C.C. Liang, C.Y. Chang, C.F. Chang, Y.H. Guo, M.H. Lee, C.Y.L. Liu, T.-C. Yu NSRRC, Hsinchu, Taiwan
	TPS (Taiwan Photon Source) beamlines have operated for three years after the successful commission in 2015. Recently, the electromagnetic activated pressure relief valve of cryogenic phase separator of beamline had malfunction due to the rust of its control circuits. After on site observation and temperature records, the water was found to be condensed around the outlet area due to fast temperature dropping near the valve as it was activated. Such situation would cause the rust of metal components due to humidity after a certain period of time. To avoid such event, fan is used to blow the condensed water and silicone heat belts are added to increase the local temperature with unique designed clamp for fixing the fan, sensors and safety circuit breaker. Via the temperature control system, the temperature monitoring, setting and the abnormal situation can be access on web page through Ethernet to make sure the proper operation of the protected devices. The instrument has been operated since Dec. 2018. After four months of operation, the moist situation has been improved and the relief valve is no longer frosted.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP045
About •	paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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WEPGW002	Standardising of Application Specific Implementations at the Australian Synchrotron	interface, controls, synchrotron, distributed	2460
	R.B. Hogan, S. Chen, A. Michalczyk AS - ANSTO, Clayton, Australia
	There is a need for a flexible stand-alone device that can provide a synchronous standard interface, which can accept application specific add-ons. We are proposing the Chameleon device that will be designed around a Xilinx Zynq System on Module (SoM) and a standard VITA 57.1 HPC FMC. The proposed solution will allow the use of COTS or in-house designed FMC modules and interface with the control system through PoE+ enabled Ethernet connection. The Chameleon device will also be able to plug into a White Rabbit network to enable the high performance synchronisation capabilities. This device will reduce the cost of implementing application specific solutions to better support the growing demands of scientific research at the Australian Synchrotron.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW002
About •	paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPGW021	Generic Digitization of Analog Signals at FAIR – First Prototype Results at GSI	controls, interface, hardware, operation	2514
	R.J. Steinhagen, R. Bär, A. Franke, A. Krimm, K. Lüghausen, D. Ondreka, A. Schwinn, M. Thieme GSI, Darmstadt, Germany
	FAIR operation and notably the new FAIR Control Centre will be based on a ’fully-digital’ control paradigm for which about 300 generic digitizers covering analog bandwidths and sampling frequencies from a few MHz to a GHz will be deployed. The aim is to acquire all pertinent accelerator system and beam parameters to facilitate a multi-mission of continuous performance tracking, (semi-)automated feedbacks and setup tools, early detection and isolation of hardware failures or near-misses, and to provide a dependable generic platform for equipment experts that enable post-mortem analyses or remote diagnostics. The goal of the controls integration was to provide a generic abstraction of the vendor-specific electro-mechanical form-factor and software interfaces based on modern software-defined-radio (SDR) principles. In addition to a ns-level-syncronised time- and frequency-domain based acquisitions, the interface provides a wide range of generic user-configurable signal post-processing routines common for SDRs and also found in many modern benchtop oscilloscopes, spectrum- or vector-network analysers. The acquired raw and derived signals are exported to the FAIR control system using a standardised front-end software architecture (FESA) and a common middle-ware (CMW). Further integration goals were to simplify possible future extensions, compactness, readability, reusability, testability, and long-term maintainability of the code-based which led to the re-use of established open-source signal processing and data fitting frameworks such as GNU-Radio and ROOT. While explicitly kept open for new or other specific digitizer or SDRs, the initial integration, prototyping, and testing have been done for the PS3000-, PS4000-, and PS600-series of digitizers from Pico Technology.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW021
About •	paper received ※ 15 May 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019
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WEPGW073	Control System for Lasers at Hilase	laser, controls, EPICS, PLC	2641
	J. Horáček, T. Mocek, M. Rehakova HiLASE Centre, Institute of Physics ASCR, v.v.i., Dolní Bře’any, Czech Republic R. Modic, J. Podlipnik, M. Pogacnik Cosy lab, Ljubljana, Slovenia
	We present the current state of the HiLASE Centre control system developed in cooperation with Cosylab. The aim of the development is to build a control system which would be in charge of the operation of kW-class in-house-developed laser beamlines. These beamlines deliver picosecond pulses with repetition rates between 1 kHz and 1 MHz and high-energy nanosecond pulses at 10 Hz. A generic control system architecture is presented, which can either support full-size development lasers or compact industrial versions. The EPICS control system work focuses on image acquisition and processing, vacuum control, provision of timing, archiving and user interfaces. HiLASE provides high-level requirements, Cosylab complements them, provides the design of the solution and implementation. Delivery is performed during on-site visits where a test plan is executed for acceptance. This approach relieves HiLASE of the need to hire and manage their own team while retaining full control over the functionality through requirements and acceptance approval. Cosylab complements HiLASE with self-managed teams that deliver to specification.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW073
About •	paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPGW074	MYRRHA DAQ Development	controls, EPICS, GUI, LabView	2645
	R. Modic Cosy lab, Ljubljana, Slovenia P. Della Faille, D. Vandeplassche SCK•CEN, Mol, Belgium P. Mekuc Cosylab, Ljubljana, Slovenia
	An approach to a generic Data Acquisition (DAQ) solution for the MYRRHA test stand at Louvain-la-Neuve (Belgium) will be described in this paper. Need for better sampling performance, signal quality, arbitrary processing and storage of measurements was a motivation for this work. A full integration of the DAQ system in the global EPICS control environment was a strong requirement. An intermediate DAQ platform was put in place to satisfy the control and experiment needs. The NI PXI platform is selected to minimize integration and development effort. NI LabVIEW is used to create a generic DAQ application. CALab library supported by BESSY is used to connect LabVIEW and EPICS. CSS GUI provides the user with the necessary control, visualization and configuration capability. The technical and organizational approach to the collaboration will be detailed in the paper. Necessary customizations of CSS and CALab and experience on using NI PXI for DAQ platform will be explained.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW074
About •	paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPGW079	A Channel Access Software Platform for Beam Dynamics Applications in Scripting Languages	interface, controls, EPICS, MMI	2661
	J.T.M. Chrin, M. Aiba, J. Snuverink PSI, Villigen PSI, Switzerland
	To facilitate the seamless integration of EPICS (Experimental Physics and Industrial Control System) into high-level applications in particle accelerators, a dedicated modern C++ Channel Access Interface (CAFE) library* provides a comprehensive and user-friendly interface to the underlying control system. Functionality is provided for synchronous and asynchronous interaction of single and composite groups of channels, coupled with an abstract layer tailored towards beam dynamics applications and complex modelling of virtual accelerators. Equivalent consumable solutions in scripting and domain-specific languages can then be accelerated by providing bindings to the relevant methods of the interface platform. This is exemplified by CAFE’s extensive MATLAB interface, incarnated through a single MATLAB executable (mex) file, and a high performance Python interface written in the Cython programming language. A number of gratifying particularities specific to these language extension modules are revealed. * http://cafe.psi.ch
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW079
About •	paper received ※ 15 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPGW113	Propose a Non-Destructive Stern-Gerlach Apparatus for Measuring the Spin Polarization of Electron Beam	electron, quadrupole, polarization, simulation	2763
	W. Liu, E. Wang 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. Mott polarimeter is used for measuring the spin polarization of <10 MeV electron beam destructively. We propose a nondestructive spin polarization measurement device for electron beam based on Stern-Gerlach effect, which include a magnetic quadrupole, Lorenz force compensated electric quadrupole and Beam position monitor. The magnetic quadrupole provides a spin-magnetic interaction force (or Stern-Gerlach force) for the spin polarized electrons. The electric quadrupole provides an electric field force for electrons to offset the Lorentz force induced by the magnetic quadrupole. So that the polarized electron beam only experience the gradient force in the device, which has ability to split the spin polarized electron beam. By measuring the split spin polarized electrons using high resolution beam position monitor, the polarization of electron beam can be calculated. We will present the theoretical analysis and calculation of electron motion in this device.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW113
About •	paper received ※ 01 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPGW116	LHC Optics Measurement and Correction Software Progress and Plans	optics, coupling, MMI, GUI	2773
	R. Tomás, F.S. Carlier, J.M. Coello de Portugal, J. Dilly, E. Fol, A. Garcia-Tabares, M. Hofer, E.H. Maclean, L. Malina, T.H.B. Persson, P.K. Skowroński, M.L. Spitznagel, A. Wegscheider, J. Wenninger CERN, Geneva, Switzerland J.F. Cardona, Y. Rodriguez UNAL, Bogota D.C, Colombia F.S. Carlier NIKHEF, Amsterdam, The Netherlands D. Esperante Pereira, J. Fuster, D. Gonzalez-Iglesias IFIC, Valencia, Spain R. Hoekstra KVI, Groningen, The Netherlands
	LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. In turn, this calls for a higher level of automation, where machine learning techniques are being implemented. During the Long Shutdown 2 a large refactoring of the codes will be in place to improve performance, maintainability and extensibility. A description of the current status of the software and future plans is given.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW116
About •	paper received ※ 07 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPRB061	The Integration and RF Conditioning of the ESS Double-Spoke Prototype Cryomodule at FREIA	cavity, vacuum, proton, cryomodule	2952
	H. Li, K. Fransson, K.J. Gajewski, L. Hermansson, A. Miyazaki, R.J.M.Y. Ruber, R. Santiago Kern Uppsala University, Uppsala, Sweden
	ESS, the European Spallation Source, will adopt a single family of double-spoke cavities for accelerating the proton beam from the normal conducting section to the first family of the elliptical superconducting cavities. They will be the first double-spoke cavities in the world to be commissioned for a high power proton accelerator. The first double-spoke cavity cryomodule for the ESS project is under high power test at Uppsala University. This paper presents the integration, RF conditioning and experience of this prototype cryomodule.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB061
About •	paper received ※ 26 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPRB063	Connection of 12 GHz High Power RF from the XBOX 1 High Gradient Test Stand to the CLEAR Electron LINAC	LLRF, klystron, linac, electron	2960
	A.V. Edwards Cockcroft Institute, Lancaster University, Lancaster, United Kingdom N. Catalán Lasheras, S. Gonzalez Anton, G. McMonagle, S. Pitman, B.J. Woolley, V. del Pozo Romano CERN, Meyrin, Switzerland
	A new RF system is being established at XBOX1 to drive two §I{100}{MV/m} CLIC structures in the CLEAR electron linac. In the past, these structures had been powered by RF from PET structures excited by a drive beam. This drive beam is no longer available. The upgrade will reroute power from the §I{50}{MW} klystron and pulse compressor which was previously used to power the structure in XBOX1. During the upgrade, the LLRF system will be optimised to improve the modulation of the output signals and down-mixing of the returning signals to obtain accurate phase and amplitude information. The design of the improved LLRF and software, along with phase noise measurements and comparisons with the old system are made in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB063
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPRB113	Toolbox for Optimization of RF Efficiency for Linacs	linac, klystron, booster, RF-structure	3074
	J. Ögren, A. Latina, D. Schulte CERN, Meyrin, Switzerland
	We present a toolbox for optimizing the rf efficiency for linacs and as an example we use it to re-optimize the Compact Linear Collider booster linac. We have implemented a numerical model of a SLED-type pulse compressor that can generate a single or a double pulse. Together with the CERN CLICopti library, an RF structure parameter estimator, we created the toolbox which enables thorough optimizations of linacs in terms of RF efficiency, beam stability, and cost simultaneously, via a simple and concise Octave script. This toolbox was created for the optimization of X-band-based linacs, however it can also be used at lower frequencies, e.g. in the S- and in the C- bands of frequencies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB113
About •	paper received ※ 06 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPMP046	Knowledge Exchange Within the Particle Accelerator Community via Cloud Computing	simulation, GUI, HOM, electron	3548
	D.L. Bruhwiler, D.T. Abell, N.M. Cook, C.C. Hall, M.V. Keilman, P. Moeller, R. Nagler, B. Nash RadiaSoft LLC, Boulder, Colorado, USA
	Funding: Work supported by US Department of Energy under Award Nos. DE-SC0011237, DE-SC0011340, DE-SC0018719, DE-SC0015212, DE-SC0017181 and DE-SC0017162. The development, testing and use of particle accelerator modeling codes is a core competency of accelerator research laboratories around the world, and likewise for synchrotron radiation and X-ray optics codes at lightsource facilities. Such codes require time and training to learn a command-line workflow involving multiple input and configuration files, execution on a high-performance server or cluster, post-processing with specialized software and finally visualization. Such workflows are error prone an difficult to reproduce. Cloud computing and UI design are core competencies of RadiaSoft LLC, where the Sirepo* framework is being developed to make state of the art codes available in the browser of any desktop, laptop or tablet. We present our initial successes as real world examples of knowledge exchange (KE) between industry and the research community. This work is leading to broader knowledge exchange throughout the community by facilitating education of students and enabling instantaneous sharing of simulation details between colleagues. Sirepo design objectives include: seamless integration with legacy codes, low barrier to entry for new users, configuration transfer to command line mode, catalog of provenance to aid reproducibility, and simplified collaboration through multimodal sharing. The Sirepo Scientific Gateway** allows users to directly test the software. The combination of intuitive browser-based GUIs and Sirepo’s server-side application container technology enables simplified computational archiving and reproducibility. If embraced by the community, this could become an important asset for the design, commissioning and future upgrade of particle accelerator and X-ray beamline facilities. * Sirepo cloud computing framework, https://github.com/radiasoft/sirepo ** Sirepo Scientific Gateway, https://sirepo.com
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP046
About •	paper received ※ 21 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPGW069	Implementation of CERN Secondary Beam Lines T9 and T10 in BDSIM	target, optics, secondary-beams, simulation	3746
	G. D’Alessandro, S.T. Boogert, S.M. Gibson, L.J. Nevay, W. Shields JAI, Egham, Surrey, United Kingdom J. Bernhard, A. Gerbershagen, M.S. Rosenthal CERN, Geneva, Switzerland
	CERN has a unique set of secondary beam lines, which deliver particle beams extracted from the PS and SPS accelerators after their interaction with a target, reaching energies up to 400 GeV. These beam lines provide a crucial contribution for test beam facilities and host several fixed target experiments. A correct operation of the beam lines requires precise simulations of the beam optics and studies on the beam-matter interaction, radiation protection, beam equipment survival etc. BDSIM combines tracking studies with energy deposition and beam-matter interaction simulations within one software framework. This paper presents studies conducted on secondary beams with BDSIM for the beam lines T9 and T10. We report the tracking analysis and the energy deposition along the beam line. Tracking analysis validation is demonstrated via comparison to existing code.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW069
About •	paper received ※ 30 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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THPRB100	A Generic Software Platform for Rapid Prototyping of Online Control Algorithms	simulation, controls, interface, EPICS	4063
	C.J.R. Duncan, M.B. Andorf, I.V. Bazarov, I.V. Bazarov, C.M. Gulliford, V. Khachatryan, J.M. Maxson, D.L. Rubin Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA I.V. Bazarov Cornell University, Ithaca, New York, USA
	Funding: US Department of Energy DE-SC 0013571 Algorithmic control of accelerators is an active area of research that promises significant improvements in machine performance. To facilitate rapid algorithm prototyping, we have developed a generic interface between accelerator controls, beam physics modelling software and modern scripting languages. The work-flow of a project using this interface begins with testing algorithms of choice offline in simulation. After off-line testing, the same code can be deployed on real machines via the Experimental Physics and Industrial Control System (EPICS) API. We include noise in our simulations in order to mimic realistic accelerator behaviour and to evaluate robustness of algorithms to experimental uncertainties and long-term drifts. The results of test cases of using this framework are presented, including emittance tuning of the Cornell Electron Storage Ring (CESR), correction of diurnal drift in CESR steering and orbit correction on CESR and the Cornell-BNL ERL Test Accelerator (CBETA).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB100
About •	paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS004	The Sirius Heating System for the In-situ NEG Activation	controls, vacuum, power-supply, storage-ring	4109
	P.H. Nallin, M. Bacchetti, F.G.R. Carrera, D.R. Cavalcante, R.O. Ferraz, P.P.S. Freitas, G.R. Gomes, J.G. Hidalgo, R.T. Neuenschwander, F.A.M. Pinto, A.R.D. Rodrigues, R.M. Seraphim LNLS, Campinas, Brazil
	Sirius is a 3 GeV fourth-generation synchrotron light source under commissioning in Brazil, with 518 m circumference and a bare lattice emittance of 0.25 nm.rad. This ultra-low emittance machine is based on approximately 700 magnets with 28 mm typical gap. The standard vacuum chamber, that makes up around 80% of the circumference, is a 26 mm external diameter copper tube. Due to the small conductance of the chambers and the limited space between the magnets, the vacuum pumping will be based on distributed concept and then non-evaporable getter (NEG) coating will be extensively used. To activate the NEG coating, the chambers must be heated at 200°C for about 24 hours. The solution for Sirius was the development of an ultra-thin heating tape, 0.4 mm thick, which allows an in-situ bake-out. The developed tapes are able to operate continuously at 220°C and have in their design a thermal shield that reduces the radiation heat loss to the magnets. This paper describes the development of the heating tape, its power supply, the control software and the operation of the system during the NEG activation at Sirius.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS004
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS019	Design of Beam Position Monitoring System for IPM Low Energy Electron LINAC	cavity, electron, simulation, linac	4394
	N. Messbah, F. Abbasi Davani Shahid Beheshti University, Tehran, Iran S. Ahmadiannamin ILSF, Tehran, Iran H. Shaker, M. Shirshekan IPM, Tehran, Iran
	A beam position monitor (BPM) is a common device used in particle accelerators to measure the position of a beam of charged-particles. The goal of this project is to simulate and build prototype of different parts to be used for IPM low energy electron Linac being developed at Institute for Research in Fundamental Sciences. The IPM low energy electron Linac will initially be operated at a 7𝜇sec pulse duration and 250 Hz repetition rate with 2.998 GHz bunching frequency. A 4.5-MeV electron beam will be available in the second phase of commissioning. The device is composed of two pickup S-band cavities and a detection circuit to read out the electron beam’s position. The electrode pickup sensors will sense the mode strength generated by the passing beam of electrons. The working modes are TM110 (dipole) for the so called position cavity and TM010 (monopole) for the reference cavity. When the beam crosses the two cavity gaps it induces signals proportional to the product of charge and position offset in the position cavity, and to the charge only in the reference cavity. the position cavity has four rectangular waveguides that couple to the dipole mode while rejecting the monopole mode that would otherwise limit the resolution of the electronics. This signal will be input to a detection circuit that will be used to calculate the signals detected by four antennas arranged. A 180 degree hybrid at the first stage reduce the monopole and a heterodyne receiver principle was used to down-convert the signal frequency in about MHz IF frequency. These signals can then be used to determine the beam’s displacement from the center.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS019
About •	paper received ※ 15 May 2019 paper accepted ※ 24 May 2019 issue date ※ 21 June 2019
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THPTS076	Design and Construction of Sextupole Magnet Prototype for Siam Photon Source II Project	sextupole, quadrupole, simulation, multipole	4295
	S. Prawanta, B. Boonwanna, P. Klysubun, A. Kwankasem, S. Pongampai, V. Sooksrimuang, P. Sudmuang, P. Sunwong SLRI, Nakhon Ratchasima, Thailand
	Siam Photon Source II (SPS-II) project in Thailand is the third-generation synchrotron light source. The lattice of the 3 GeV electron storage ring has been designed, consisting of 14 Double Triple Bend Achromat (DTBA) cells with the total circumference of 321.3 m. The storage ring lattice includes 56 bending magnets, 28 combined dipole and quadrupole magnets, 224 quadrupole magnets and 84 multifunction sextupole magnets. This paper presents the design and construction of a sextupole magnet prototype for SPS-II project. Magnet prototype was designed with the magnetic field gradient of 2,030 T/m2 and includes functions of skew-quadrupole, horizontal and vertical correctors. The magnetic core is made of S10C low-carbon steel. A prototype of sextupole magnet has been constructed. All dimensional tolerances are within the range of ±20 µm.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS076
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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MOPGW080

Optics Measurements in the CERN PS Booster Using Turn-by-Turn BPM Data

optics, injection, MMI, booster

285

A. Garcia-Tabares, P.K. Skowroński, R. Tomás
CERN, Geneva, Switzerland
A. Garcia-Tabares
Universidad Complutense Madrid, Madrid, Spain

As part of the LHC Injector Upgrade Project the injection of the CERN PS Booster will be changed to increase intensity and brightness of the delivered beams. The new injection scheme is likely to give rise to beta beating above the required level of 5\% and new measurements are required. Achieving accurate optics measurements in PSB lattice is a challenging task that has involved several improvements in both hardware and software. This paper summarizes all the improvements that have been performed in the optics measurement acquisition system together with a brief summary of the first results obtained.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW080

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paper received ※ 11 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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TUZZPLM1

Operational Results of LHC Collimator Alignment Using Machine Learning

alignment, injection, collimation, MMI

1208

G. Azzopardi, A. Muscat, G. Valentino
University of Malta, Information and Communication Technology, Msida, Malta
S. Redaelli, B. Salvachua
CERN, Geneva, Switzerland

A complex collimation system is installed in the Large Hadron Collider to protect sensitive equipment from unavoidable beam losses. The collimators are positioned close to the beam in the form of a hierarchy, which is guaranteed by precisely aligning each collimator with a precision of a few tens of micrometers. During past years, collimator alignments were performed semi-automatically*, such that collimation experts had to be present to oversee and control the alignment. In 2018, machine learning was introduced to develop a new fully-automatic alignment tool, which was used for collimator alignments throughout the year. This paper discusses how machine learning was used to automate the alignment, whilst focusing on the operational results obtained when testing the new software in the LHC. Automatically aligning the collimators decreased the alignment time at injection by a factor of three whilst maintaining the accuracy of the results.
*G.Valentino et al., "Semi-automatic beam-based LHC collimator alignment", PRSTAB, no.5, 2012.

Slides TUZZPLM1 [6.060 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUZZPLM1

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paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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TUPMP023

Design of Digital Controller for Multi Module Series-parallel Accelerator Power Supply

power-supply, controls, simulation, hardware

1288

J. Li, Y. Liu, X. Qi, W.Q. Zhang
IHEP, Beijing, People’s Republic of China

Funding: Supported by funds, Key laboratory of particle Acceleration Physics & Technology, Institute of High Energy Physics, Chinese Academy of Sciences，Project number：Y5294107TD
With the development of accelerators, Accelerator physics require power supply output high voltage and current (Peak power reached MWs). And the current stability requirements better than 10ppm. Therefore, the power supply is mostly used in the mode of module series-parallel. However, during actual commissioning, the power supply often does not run at rated current. If the power supply is running at less than 30% of the rated current, the power output current stability will drop sharply. This topic designed a set of digital controller for multi-module serial-parallel control. The digital controller can automatically adjust the number of input modules according to the current setting, and can automatically allocate the required PWM number of the module. While taking into account the synchronization between the various modules, Ensure the power supply is always running at an optimal working condition. Through a special AD conversion hardware design and advanced closed-loop controller algorithm, the digital controller can provide up to 20 high-resolution PWM signals to drive power conversion devices.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP023

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP045

The Protection Instrument for Cryogenic Phase Separator Pressure Relief Valve of TPS Beamline

controls, monitoring, operation, cryogenics

1350

C.C. Liang, C.Y. Chang, C.F. Chang, Y.H. Guo, M.H. Lee, C.Y.L. Liu, T.-C. Yu
NSRRC, Hsinchu, Taiwan

TPS (Taiwan Photon Source) beamlines have operated for three years after the successful commission in 2015. Recently, the electromagnetic activated pressure relief valve of cryogenic phase separator of beamline had malfunction due to the rust of its control circuits. After on site observation and temperature records, the water was found to be condensed around the outlet area due to fast temperature dropping near the valve as it was activated. Such situation would cause the rust of metal components due to humidity after a certain period of time. To avoid such event, fan is used to blow the condensed water and silicone heat belts are added to increase the local temperature with unique designed clamp for fixing the fan, sensors and safety circuit breaker. Via the temperature control system, the temperature monitoring, setting and the abnormal situation can be access on web page through Ethernet to make sure the proper operation of the protected devices. The instrument has been operated since Dec. 2018. After four months of operation, the moist situation has been improved and the relief valve is no longer frosted.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP045

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paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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WEPGW002

Standardising of Application Specific Implementations at the Australian Synchrotron

interface, controls, synchrotron, distributed

2460

R.B. Hogan, S. Chen, A. Michalczyk
AS - ANSTO, Clayton, Australia

There is a need for a flexible stand-alone device that can provide a synchronous standard interface, which can accept application specific add-ons. We are proposing the Chameleon device that will be designed around a Xilinx Zynq System on Module (SoM) and a standard VITA 57.1 HPC FMC. The proposed solution will allow the use of COTS or in-house designed FMC modules and interface with the control system through PoE+ enabled Ethernet connection. The Chameleon device will also be able to plug into a White Rabbit network to enable the high performance synchronisation capabilities. This device will reduce the cost of implementing application specific solutions to better support the growing demands of scientific research at the Australian Synchrotron.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW002

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paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPGW021

Generic Digitization of Analog Signals at FAIR – First Prototype Results at GSI

controls, interface, hardware, operation

2514

R.J. Steinhagen, R. Bär, A. Franke, A. Krimm, K. Lüghausen, D. Ondreka, A. Schwinn, M. Thieme
GSI, Darmstadt, Germany

FAIR operation and notably the new FAIR Control Centre will be based on a ’fully-digital’ control paradigm for which about 300 generic digitizers covering analog bandwidths and sampling frequencies from a few MHz to a GHz will be deployed. The aim is to acquire all pertinent accelerator system and beam parameters to facilitate a multi-mission of continuous performance tracking, (semi-)automated feedbacks and setup tools, early detection and isolation of hardware failures or near-misses, and to provide a dependable generic platform for equipment experts that enable post-mortem analyses or remote diagnostics. The goal of the controls integration was to provide a generic abstraction of the vendor-specific electro-mechanical form-factor and software interfaces based on modern software-defined-radio (SDR) principles. In addition to a ns-level-syncronised time- and frequency-domain based acquisitions, the interface provides a wide range of generic user-configurable signal post-processing routines common for SDRs and also found in many modern benchtop oscilloscopes, spectrum- or vector-network analysers. The acquired raw and derived signals are exported to the FAIR control system using a standardised front-end software architecture (FESA) and a common middle-ware (CMW). Further integration goals were to simplify possible future extensions, compactness, readability, reusability, testability, and long-term maintainability of the code-based which led to the re-use of established open-source signal processing and data fitting frameworks such as GNU-Radio and ROOT. While explicitly kept open for new or other specific digitizer or SDRs, the initial integration, prototyping, and testing have been done for the PS3000-, PS4000-, and PS600-series of digitizers from Pico Technology.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW021

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paper received ※ 15 May 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019

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WEPGW073

Control System for Lasers at Hilase

laser, controls, EPICS, PLC

2641

J. Horáček, T. Mocek, M. Rehakova
HiLASE Centre, Institute of Physics ASCR, v.v.i., Dolní Bře’any, Czech Republic
R. Modic, J. Podlipnik, M. Pogacnik
Cosy lab, Ljubljana, Slovenia

We present the current state of the HiLASE Centre control system developed in cooperation with Cosylab. The aim of the development is to build a control system which would be in charge of the operation of kW-class in-house-developed laser beamlines. These beamlines deliver picosecond pulses with repetition rates between 1 kHz and 1 MHz and high-energy nanosecond pulses at 10 Hz. A generic control system architecture is presented, which can either support full-size development lasers or compact industrial versions. The EPICS control system work focuses on image acquisition and processing, vacuum control, provision of timing, archiving and user interfaces. HiLASE provides high-level requirements, Cosylab complements them, provides the design of the solution and implementation. Delivery is performed during on-site visits where a test plan is executed for acceptance. This approach relieves HiLASE of the need to hire and manage their own team while retaining full control over the functionality through requirements and acceptance approval. Cosylab complements HiLASE with self-managed teams that deliver to specification.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW073

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paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPGW074

MYRRHA DAQ Development

controls, EPICS, GUI, LabView

2645

R. Modic
Cosy lab, Ljubljana, Slovenia
P. Della Faille, D. Vandeplassche
SCK•CEN, Mol, Belgium
P. Mekuc
Cosylab, Ljubljana, Slovenia

An approach to a generic Data Acquisition (DAQ) solution for the MYRRHA test stand at Louvain-la-Neuve (Belgium) will be described in this paper. Need for better sampling performance, signal quality, arbitrary processing and storage of measurements was a motivation for this work. A full integration of the DAQ system in the global EPICS control environment was a strong requirement. An intermediate DAQ platform was put in place to satisfy the control and experiment needs. The NI PXI platform is selected to minimize integration and development effort. NI LabVIEW is used to create a generic DAQ application. CALab library supported by BESSY is used to connect LabVIEW and EPICS. CSS GUI provides the user with the necessary control, visualization and configuration capability. The technical and organizational approach to the collaboration will be detailed in the paper. Necessary customizations of CSS and CALab and experience on using NI PXI for DAQ platform will be explained.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW074

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paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPGW079

A Channel Access Software Platform for Beam Dynamics Applications in Scripting Languages

interface, controls, EPICS, MMI

2661

J.T.M. Chrin, M. Aiba, J. Snuverink
PSI, Villigen PSI, Switzerland

To facilitate the seamless integration of EPICS (Experimental Physics and Industrial Control System) into high-level applications in particle accelerators, a dedicated modern C++ Channel Access Interface (CAFE) library* provides a comprehensive and user-friendly interface to the underlying control system. Functionality is provided for synchronous and asynchronous interaction of single and composite groups of channels, coupled with an abstract layer tailored towards beam dynamics applications and complex modelling of virtual accelerators. Equivalent consumable solutions in scripting and domain-specific languages can then be accelerated by providing bindings to the relevant methods of the interface platform. This is exemplified by CAFE’s extensive MATLAB interface, incarnated through a single MATLAB executable (mex) file, and a high performance Python interface written in the Cython programming language. A number of gratifying particularities specific to these language extension modules are revealed.
* http://cafe.psi.ch

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW079

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paper received ※ 15 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPGW113

Propose a Non-Destructive Stern-Gerlach Apparatus for Measuring the Spin Polarization of Electron Beam

electron, quadrupole, polarization, simulation

2763

W. Liu, E. Wang
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.
Mott polarimeter is used for measuring the spin polarization of <10 MeV electron beam destructively. We propose a nondestructive spin polarization measurement device for electron beam based on Stern-Gerlach effect, which include a magnetic quadrupole, Lorenz force compensated electric quadrupole and Beam position monitor. The magnetic quadrupole provides a spin-magnetic interaction force (or Stern-Gerlach force) for the spin polarized electrons. The electric quadrupole provides an electric field force for electrons to offset the Lorentz force induced by the magnetic quadrupole. So that the polarized electron beam only experience the gradient force in the device, which has ability to split the spin polarized electron beam. By measuring the split spin polarized electrons using high resolution beam position monitor, the polarization of electron beam can be calculated. We will present the theoretical analysis and calculation of electron motion in this device.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW113

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paper received ※ 01 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPGW116

LHC Optics Measurement and Correction Software Progress and Plans

optics, coupling, MMI, GUI

2773

R. Tomás, F.S. Carlier, J.M. Coello de Portugal, J. Dilly, E. Fol, A. Garcia-Tabares, M. Hofer, E.H. Maclean, L. Malina, T.H.B. Persson, P.K. Skowroński, M.L. Spitznagel, A. Wegscheider, J. Wenninger
CERN, Geneva, Switzerland
J.F. Cardona, Y. Rodriguez
UNAL, Bogota D.C, Colombia
F.S. Carlier
NIKHEF, Amsterdam, The Netherlands
D. Esperante Pereira, J. Fuster, D. Gonzalez-Iglesias
IFIC, Valencia, Spain
R. Hoekstra
KVI, Groningen, The Netherlands

LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. In turn, this calls for a higher level of automation, where machine learning techniques are being implemented. During the Long Shutdown 2 a large refactoring of the codes will be in place to improve performance, maintainability and extensibility. A description of the current status of the software and future plans is given.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW116

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paper received ※ 07 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPRB061

The Integration and RF Conditioning of the ESS Double-Spoke Prototype Cryomodule at FREIA

cavity, vacuum, proton, cryomodule

2952

H. Li, K. Fransson, K.J. Gajewski, L. Hermansson, A. Miyazaki, R.J.M.Y. Ruber, R. Santiago Kern
Uppsala University, Uppsala, Sweden

ESS, the European Spallation Source, will adopt a single family of double-spoke cavities for accelerating the proton beam from the normal conducting section to the first family of the elliptical superconducting cavities. They will be the first double-spoke cavities in the world to be commissioned for a high power proton accelerator. The first double-spoke cavity cryomodule for the ESS project is under high power test at Uppsala University. This paper presents the integration, RF conditioning and experience of this prototype cryomodule.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB061

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paper received ※ 26 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPRB063

Connection of 12 GHz High Power RF from the XBOX 1 High Gradient Test Stand to the CLEAR Electron LINAC

LLRF, klystron, linac, electron

2960

A.V. Edwards
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
N. Catalán Lasheras, S. Gonzalez Anton, G. McMonagle, S. Pitman, B.J. Woolley, V. del Pozo Romano
CERN, Meyrin, Switzerland

A new RF system is being established at XBOX1 to drive two §I{100}{MV/m} CLIC structures in the CLEAR electron linac. In the past, these structures had been powered by RF from PET structures excited by a drive beam. This drive beam is no longer available. The upgrade will reroute power from the §I{50}{MW} klystron and pulse compressor which was previously used to power the structure in XBOX1. During the upgrade, the LLRF system will be optimised to improve the modulation of the output signals and down-mixing of the returning signals to obtain accurate phase and amplitude information. The design of the improved LLRF and software, along with phase noise measurements and comparisons with the old system are made in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB063

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPRB113

Toolbox for Optimization of RF Efficiency for Linacs

linac, klystron, booster, RF-structure

3074

J. Ögren, A. Latina, D. Schulte
CERN, Meyrin, Switzerland

We present a toolbox for optimizing the rf efficiency for linacs and as an example we use it to re-optimize the Compact Linear Collider booster linac. We have implemented a numerical model of a SLED-type pulse compressor that can generate a single or a double pulse. Together with the CERN CLICopti library, an RF structure parameter estimator, we created the toolbox which enables thorough optimizations of linacs in terms of RF efficiency, beam stability, and cost simultaneously, via a simple and concise Octave script. This toolbox was created for the optimization of X-band-based linacs, however it can also be used at lower frequencies, e.g. in the S- and in the C- bands of frequencies.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB113

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paper received ※ 06 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPMP046

Knowledge Exchange Within the Particle Accelerator Community via Cloud Computing

simulation, GUI, HOM, electron

3548

D.L. Bruhwiler, D.T. Abell, N.M. Cook, C.C. Hall, M.V. Keilman, P. Moeller, R. Nagler, B. Nash
RadiaSoft LLC, Boulder, Colorado, USA

Funding: Work supported by US Department of Energy under Award Nos. DE-SC0011237, DE-SC0011340, DE-SC0018719, DE-SC0015212, DE-SC0017181 and DE-SC0017162.
The development, testing and use of particle accelerator modeling codes is a core competency of accelerator research laboratories around the world, and likewise for synchrotron radiation and X-ray optics codes at lightsource facilities. Such codes require time and training to learn a command-line workflow involving multiple input and configuration files, execution on a high-performance server or cluster, post-processing with specialized software and finally visualization. Such workflows are error prone an difficult to reproduce. Cloud computing and UI design are core competencies of RadiaSoft LLC, where the Sirepo* framework is being developed to make state of the art codes available in the browser of any desktop, laptop or tablet. We present our initial successes as real world examples of knowledge exchange (KE) between industry and the research community. This work is leading to broader knowledge exchange throughout the community by facilitating education of students and enabling instantaneous sharing of simulation details between colleagues. Sirepo design objectives include: seamless integration with legacy codes, low barrier to entry for new users, configuration transfer to command line mode, catalog of provenance to aid reproducibility, and simplified collaboration through multimodal sharing. The Sirepo Scientific Gateway** allows users to directly test the software. The combination of intuitive browser-based GUIs and Sirepo’s server-side application container technology enables simplified computational archiving and reproducibility. If embraced by the community, this could become an important asset for the design, commissioning and future upgrade of particle accelerator and X-ray beamline facilities.
* Sirepo cloud computing framework, https://github.com/radiasoft/sirepo
** Sirepo Scientific Gateway, https://sirepo.com

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP046

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paper received ※ 21 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPGW069

Implementation of CERN Secondary Beam Lines T9 and T10 in BDSIM

target, optics, secondary-beams, simulation

3746

G. D’Alessandro, S.T. Boogert, S.M. Gibson, L.J. Nevay, W. Shields
JAI, Egham, Surrey, United Kingdom
J. Bernhard, A. Gerbershagen, M.S. Rosenthal
CERN, Geneva, Switzerland

CERN has a unique set of secondary beam lines, which deliver particle beams extracted from the PS and SPS accelerators after their interaction with a target, reaching energies up to 400 GeV. These beam lines provide a crucial contribution for test beam facilities and host several fixed target experiments. A correct operation of the beam lines requires precise simulations of the beam optics and studies on the beam-matter interaction, radiation protection, beam equipment survival etc. BDSIM combines tracking studies with energy deposition and beam-matter interaction simulations within one software framework. This paper presents studies conducted on secondary beams with BDSIM for the beam lines T9 and T10. We report the tracking analysis and the energy deposition along the beam line. Tracking analysis validation is demonstrated via comparison to existing code.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW069

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paper received ※ 30 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPRB100

A Generic Software Platform for Rapid Prototyping of Online Control Algorithms

simulation, controls, interface, EPICS

4063

C.J.R. Duncan, M.B. Andorf, I.V. Bazarov, I.V. Bazarov, C.M. Gulliford, V. Khachatryan, J.M. Maxson, D.L. Rubin
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
I.V. Bazarov
Cornell University, Ithaca, New York, USA

Funding: US Department of Energy DE-SC 0013571
Algorithmic control of accelerators is an active area of research that promises significant improvements in machine performance. To facilitate rapid algorithm prototyping, we have developed a generic interface between accelerator controls, beam physics modelling software and modern scripting languages. The work-flow of a project using this interface begins with testing algorithms of choice offline in simulation. After off-line testing, the same code can be deployed on real machines via the Experimental Physics and Industrial Control System (EPICS) API. We include noise in our simulations in order to mimic realistic accelerator behaviour and to evaluate robustness of algorithms to experimental uncertainties and long-term drifts. The results of test cases of using this framework are presented, including emittance tuning of the Cornell Electron Storage Ring (CESR), correction of diurnal drift in CESR steering and orbit correction on CESR and the Cornell-BNL ERL Test Accelerator (CBETA).

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB100

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS004

The Sirius Heating System for the In-situ NEG Activation

controls, vacuum, power-supply, storage-ring

4109

P.H. Nallin, M. Bacchetti, F.G.R. Carrera, D.R. Cavalcante, R.O. Ferraz, P.P.S. Freitas, G.R. Gomes, J.G. Hidalgo, R.T. Neuenschwander, F.A.M. Pinto, A.R.D. Rodrigues, R.M. Seraphim
LNLS, Campinas, Brazil

Sirius is a 3 GeV fourth-generation synchrotron light source under commissioning in Brazil, with 518 m circumference and a bare lattice emittance of 0.25 nm.rad. This ultra-low emittance machine is based on approximately 700 magnets with 28 mm typical gap. The standard vacuum chamber, that makes up around 80% of the circumference, is a 26 mm external diameter copper tube. Due to the small conductance of the chambers and the limited space between the magnets, the vacuum pumping will be based on distributed concept and then non-evaporable getter (NEG) coating will be extensively used. To activate the NEG coating, the chambers must be heated at 200°C for about 24 hours. The solution for Sirius was the development of an ultra-thin heating tape, 0.4 mm thick, which allows an in-situ bake-out. The developed tapes are able to operate continuously at 220°C and have in their design a thermal shield that reduces the radiation heat loss to the magnets. This paper describes the development of the heating tape, its power supply, the control software and the operation of the system during the NEG activation at Sirius.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS004

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS019

Design of Beam Position Monitoring System for IPM Low Energy Electron LINAC

cavity, electron, simulation, linac

4394

N. Messbah, F. Abbasi Davani
Shahid Beheshti University, Tehran, Iran
S. Ahmadiannamin
ILSF, Tehran, Iran
H. Shaker, M. Shirshekan
IPM, Tehran, Iran

A beam position monitor (BPM) is a common device used in particle accelerators to measure the position of a beam of charged-particles. The goal of this project is to simulate and build prototype of different parts to be used for IPM low energy electron Linac being developed at Institute for Research in Fundamental Sciences. The IPM low energy electron Linac will initially be operated at a 7𝜇sec pulse duration and 250 Hz repetition rate with 2.998 GHz bunching frequency. A 4.5-MeV electron beam will be available in the second phase of commissioning. The device is composed of two pickup S-band cavities and a detection circuit to read out the electron beam’s position. The electrode pickup sensors will sense the mode strength generated by the passing beam of electrons. The working modes are TM110 (dipole) for the so called position cavity and TM010 (monopole) for the reference cavity. When the beam crosses the two cavity gaps it induces signals proportional to the product of charge and position offset in the position cavity, and to the charge only in the reference cavity. the position cavity has four rectangular waveguides that couple to the dipole mode while rejecting the monopole mode that would otherwise limit the resolution of the electronics. This signal will be input to a detection circuit that will be used to calculate the signals detected by four antennas arranged. A 180 degree hybrid at the first stage reduce the monopole and a heterodyne receiver principle was used to down-convert the signal frequency in about MHz IF frequency. These signals can then be used to determine the beam’s displacement from the center.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS019

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paper received ※ 15 May 2019 paper accepted ※ 24 May 2019 issue date ※ 21 June 2019

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THPTS076

Design and Construction of Sextupole Magnet Prototype for Siam Photon Source II Project

sextupole, quadrupole, simulation, multipole

4295

S. Prawanta, B. Boonwanna, P. Klysubun, A. Kwankasem, S. Pongampai, V. Sooksrimuang, P. Sudmuang, P. Sunwong
SLRI, Nakhon Ratchasima, Thailand

Siam Photon Source II (SPS-II) project in Thailand is the third-generation synchrotron light source. The lattice of the 3 GeV electron storage ring has been designed, consisting of 14 Double Triple Bend Achromat (DTBA) cells with the total circumference of 321.3 m. The storage ring lattice includes 56 bending magnets, 28 combined dipole and quadrupole magnets, 224 quadrupole magnets and 84 multifunction sextupole magnets. This paper presents the design and construction of a sextupole magnet prototype for SPS-II project. Magnet prototype was designed with the magnetic field gradient of 2,030 T/m2 and includes functions of skew-quadrupole, horizontal and vertical correctors. The magnetic core is made of S10C low-carbon steel. A prototype of sextupole magnet has been constructed. All dimensional tolerances are within the range of ±20 µm.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS076

About •

paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)