| Paper | Title | Other Keywords | Page |
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| MOPTS085 | Commissioning of a New Digital Transverse Damper System at the PSB | feedback, proton, operation, MMI | 1050 |
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| At the CERN Proton Synchrotron Booster, PSB, an analog transverse damper system has been in operation since 1999, providing satisfactory operational results with the proton beam supplied by Linac2. As a consequence of the LHC Injectors Upgrade, the PSB will face new challenges imposed by higher intensity, injection and extraction energy. In this framework, the transverse feedback system is subject to an upgrade to adapt to the expected Linac4 beam and to the demands for new features including transverse blow-up, beam excitation for optics measurements and new remote control and monitoring capabilities. The replacement of the aging electronic hardware is also recommended to improve the system maintainability for future years. During 2018 a new digital transverse feedback electronics was installed in the PSB, in parallel with the current operational one, offering for the first time the occasion to demonstrate its performance with beam. Encouraging results were obtained such as the suppression of beam instabilities at all PSB energies and intensities. In this paper we describe the steps undertaken in 2018 in order to commission the system with the main goal to accelerate and extract the highest intensity beams produced at the PSB. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS085 | ||
| About • | paper received ※ 06 May 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019 | ||
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| TUPMP018 | Feasibility Tests of a Vacuum System for SPring-8-II | vacuum, photon, multipole, operation | 1272 |
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| For SPring-8-II, the major upgrade of SPring-8, a test half-cell including permanent/electro magnets and a vacuum system was constructed, and hardware feasibility tests have been performed since 2017. Features of the SPring-8-II vacuum system are 1) introduction of the concept of a stainless steel 12 m-long integral chamber (LIC) with a welded structure, and 2) adoption of ex-situ baking of the chamber. The 12 m LIC with a narrow aperture, flangeless structure and a minimum number of bellows was designed so that the vacuum system could be installed without interference with the magnets of a narrow bore diameter aligned on girders with a severe packing factor. For replacement of the existing system with a new one in a short black-out period, the 12 m LIC is planned to be moved into the accelerator tunnel with keeping ultra-high vacuum (UHV) by closing thin gate valves at both ends, after evacuation to UHV by ex-situ baking and NEG activation. This presentation will overview the vacuum system, mainly the 12 m LIC, developed for the test half-cell, and describe the vacuum performance and the result of the assembly test conducted with the permanent/electro magnets. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP018 | ||
| About • | paper received ※ 15 May 2019 paper accepted ※ 17 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, software | 1288 |
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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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| 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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| TUPMP032 | Design of Analog to Digital Converter Scheme for High - Precision Electromagnet Power supply | controls, FEL, experiment, dipole | 1309 |
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| This paper deals with the design of an analogue-to-digital converter (ADC) scheme for a highly precise magnet current supply (MPS). The MPSs are requires with stable and precise current specification in range of the ppm. To meet the requirements, the AD circuit is composed of parallel ADCs of low-medium resolution. Digitally, the oversampling and averaging are performed to increase both the effective resolution and the signal to noise ratio (SNR). The implemented AD circuit was improved about 18 dB (32 times oversampling). The MPS applied by the proposed ADC scheme provides more precise control and the stable current within 10 ppm at 200 A. The experiment used a dipole magnet of the PAL-XFEL and its results proved feasibility through precisely measurable DVM3458A (Keysight Co.). | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP032 | ||
| About • | paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 | ||
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| TUPRB004 | Magnetic Measurements of Insertion Devices Using the Vibrating Wire Technique | experiment, vacuum, simulation, insertion-device | 1683 |
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| The commissioning of new in-vacuum insertion devices (ID) at the Canadian Light Source has motivated the assembly and development of a vibrating wire system. The advantage of the technique is that it is a sensitive magnetic measurement instrument at relatively low cost. Moreover, most hall probe systems require transverse access, which is often not available for in-vacuum or Delta-like devices. It is comparatively simple to string a taut wire through the gap of an in-vacuum ID. We describe the experimental challenges in mapping the field of an 80 mm period in-vacuum wiggler, IVW80, using the vibrating wire technique, and compare results against simulation and data obtained from Hall probe measurements. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB004 | ||
| About • | paper received ※ 08 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 | ||
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| TUPRB059 | Solid State Amplifier of SC Linac for Shine | cavity, linac, LLRF, factory | 1814 |
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| Shanghai HIgh repetition rate XFEL aNd Extreme light facility （SHINE）is a platform for technique and science research which energy is 8GeV, operated in CW-mode and beam current is 0.2mA. It include a LINAC of 8GeV, three undulator lines, three beam lines and ten experiment stations. SHINE is located underground 30 meters. The lengths of facility is 3kM and the length of LINAC is 1.2km. The acceleration architecture of LINAC consists of six hundred 1.3GHz and sixteen 3.9GHz TELSA type cavities. The 5.2kW SSA will drive the 1.3GHz superconductive cavities and 2kW SSA will power the 3.9GHz superconductive cavities. Four 1.3GHz prototypes of SSA have already been produced, the design and performance are showed in this paper. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB059 | ||
| About • | paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019 | ||
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| TUPRB084 | High Level Software Development Framework and Activities on VELA/CLARA | controls, operation, interface, simulation | 1855 |
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| The success of modern particle accelerators depends on good high level software. Over the past few years an integrated framework has been developed to better connect machine physicists to VELA/CLARA at the STFC’s Daresbury laboratory. This framework is comprised of a number of tools, including, a c++/Python API to interface to the EPICS control system with which all High Level Software can be developed. The API is encapsulated, extensible and designed to grow as further Phases of CLARA are installed. The API is seamlessly integrated with the VELA/CLARA virtual accelerator and other activities by the simulations group. As well as presenting the design choices and methodology we will give an overview of the first control room applications built using our tools and how they will form the basis for a new programme of machine learning and optimisation on CLARA. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB084 | ||
| About • | paper received ※ 14 May 2019 paper accepted ※ 21 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, software, operation | 2514 |
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| 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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| WEPGW104 | The CBETA Beam Position Monitor (BPM) System Design and Strategy for Measuring Multiple Simultaneous Beams in the Common Beam Pipe | timing, injection, electron, MMI | 2736 |
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. CBETA, a 4-pass electron Energy Recovery Linac (ERL) is presently under construction at Cornell University and is a collaboration between Brookhaven National Laboratory (BNL) and Cornell University. Beam commissioning began in March 2019 with a single pass ERL configuration. Commissioning of the complete 4-pass machine is scheduled to begin in fall 2019. The fixed field alternating gradient (FFA) return loop for CBETA uses Halbach permanent magnets with a common beam pipe for seven different energy beams (4 accelerating energies and 3 decelerating energies). One of the most challenging requirements for the CBETA BPM system is to independently measure the position of each of these beams. The overall design of the CBETA BPM system and the techniques planned to measure the position of each energy beam will be presented. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW104 | ||
| About • | paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 | ||
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| WEPRB021 | Commissioning of S-band Cavity Test Facility at Elettra for Conditioning of High Gradient Structures for the Fermi Linac Upgrade | cavity, LLRF, FEL, linac | 2846 |
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| FERMI is the seeded Free Electron Laser (FEL) user facility at Elettra laboratory in Trieste, operating in the VUV to soft X-rays spectral range. In order to extend the FEL spectral range to shorter wavelengths, a feasibility study for increasing the Linac energy from 1.5 GeV to 1.8 GeV is actually going on. A short prototype of a new High Gradient (HG) S-band accelerating structure has been built in collaboration with Paul Scherrer Institute (PSI). The new structures are intended to replace the present Backward Travelling Wave (BTW) sections and tailored to be operated at a gradient of 30 MV/m. For RF conditioning and high power testing of prototype, a Cavity Test Facility (CTF) is commissioned at FERMI. The test facility is equipped with RF pulse compressor system and a dedicated diagnostic for breakdown rate (BDR) measurements and events localization. In this paper we present in detail cavity test facility of FERMI and high power testing of the first prototype. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB021 | ||
| About • | paper received ※ 08 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019 | ||
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| THPMP007 | MICROTCA TECHNOLOGY LAB AT DESY: CURRENT CASES IN TECHNOLOGY TRANSFER | controls, operation, LLRF, electron | 3459 |
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Funding: The MicroTCA Technology Lab (A Helmholtz Innovation Lab) is supported by the Helmholtz Association under grant HIL-002. MicroTCA-based LLRF systems for beam control and beam diagnostics are gaining traction in many facilities around the world. Over the past decade, a comprehensive portfolio of hardware solutions (boards, crates, backplanes) has become available to cater for demanding signal processing applications in state-of-the-art facilities like the European XFEL. Gradually, industrial applications of MicroTCA also have become more common. In response various requests, DESY has opened the MicroTCA Technology Lab (A Helmholtz Innovation Lab) in April 2018 as a service unit for research and industry with a focus on: - Customer-specific developments in MicroTCA (hardware, firmware, software), - High-end test and measurement services, - Consulting and system integration. We report on intermediate results and emerging projects after one year of operation, with transfer examples from the industrial automation and medical technology sectors as well as overlapping developments for the physics research community. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP007 | ||
| About • | paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 | ||
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