IPAC2017 - List of Keywords (site)

Paper	Title	Other Keywords	Page
MOPAB084	Online Measurement of Electrode Gains for Stripline Beam Position Monitor in the HLS II Storage Ring	storage-ring, quadrupole, radiation, operation	316
	F.F. Wu, L. Lin, X.Y. Liu, P. Lu, B.G. Sun, L.L. Tang, J.G. Wang, J.H. Wei, Y.L. Yang, T.Y. Zhou, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by the National Key Research and Development Program of China(No. 2016YFA0402000) and the National Science Foundation of China (11575181, 11605202) Three axially symmetric stripline beam position monitors were installed in the HLS II storage ring and each stripline BPM was machined with button BPM together. Due to mechanical errors of stripline BPM, differences in electrode gains will lead to measurement error for beam position and mutual coupling between beam horizontal position and vertical position. So it is very important to calibrate electrode gains for axially symmetric BPM. A method was proposed to calibrate electrode gains of this kind of BPM. This method is suitable for all axially symmetric BPMs, whether stripline BPM or button BPM. The online calibrated gains were compared with offline calibrated gains and the results have shown that online and offline calibrated electrode gains were basically consistent.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB084
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MOPAB087	Study on Supports System of BPMs for HEPs	simulation, factory, storage-ring, synchrotron	322
	Z.Z. Wang, J.S. Cao, J. He, H.Z. Ma, Y.F. Sui, Z. Wang IHEP, People's Republic of China
	The High Energy Photon Source(HEPS), a third generation light source with the energy of 6 GeV, is under constructed at IHEP. It has an ultralow emittance (~50pm.rad) and small beam size, thus the requirement of BPM in precision and resolution is quite high. Independent supports with high degree of mechanical and thermal stability will be employed for some special BPMs, such as the BPMs near the insert devices. The supports should have high eigen-frequencies to minimize the amplification of vibration from the ground. Vibrations information of the ground around the supports also need be estimated, with which FEA (finite element analysis) had be utilized to simulate the performance of the supports. Measurements of vibrational stability of the prototype supports have be done and compared with the simulation.
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MOPIK126	Establishing a Project Management Office for the Large Scale Multi Project FAIR	project-management, controls, interface, operation	835
	F. Becker, S. Deveaux, A. Fröhlich, G. Hickler, M. Lautenschläger, M. Raponi, B. Schoenfelder, M. Strangmann, N. Winters GSI, Darmstadt, Germany J.R. Regler, D. Urner FAIR, Darmstadt, Germany
	The Facility for Antiproton and Ion Research (FAIR) is a large scale multi project comprising 10 subprojects in the field of accelerators (pLINAC, SIS100, SuperFRS, p-bar Separator, Collector Ring, High Energy Storage Ring), experiments (CBM, APPA, NUSTAR, PANDA) and civil construction. This contribution describes an integrated approach how a controlling type project management office (PMO) was established, meeting the overall requirements for project steering and specific requirements of the subprojects and international partners involved. Major responsibilities of the PMO are project planning, integrated reporting, cost and budget control, risk management, in-kind coordination & procurement, quality assurance & configuration management. Core processes, roles and responsibilities, methodology and interfaces internally and towards the project pillars are presented.
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MOPIK128	Integrated Project Planning as a Central Steering Tool for the Large Scale Multi Project FAIR	experiment, status, project-management, controls	842
	N. Winters, F. Becker, M.V. Ricciardi GSI, Darmstadt, Germany
	The Facility for Antiproton and Ion Research (FAIR) is a large scale multi project comprising 10 subprojects in the field of accelerators (pLINAC, SIS100, SuperFRS, p-bar, CR, HESR), experiments (CBM, APPA, NUSTAR, PANDA) and civil construction. This contribution describes the fundamental revamp of FAIR integrated project planning. Main objective is to preserve the advantages of a bottom-up planning topology with the actual and detailed level of information keeping the ~400 work package leader's central role as plan owners in their field of responsibility. Simultaneously different project phases (e.g. civil construction, procurement, installation, commissioning) need to be excluded from detailed plans while being re-integrated in the level-1 project master schedule. Additional cost profiles and resource assignment by name allow a progress tracking and flexible project steering.
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MOPVA064	Multipacting Study in INFN-LASA ESS Medium-Beta Cavity	cavity, simulation, SRF, electron	1019
	J.F. Chen, M. Bertucci, A. Bosotti, P. Michelato, L. Monaco, C. Pagani, R. Paparella, D. Sertore INFN/LASA, Segrate (MI), Italy S. Pirani ESS, Lund, Sweden
	We present Multipacting studies in ESS Medium-Beta cavities of INFN-LASA design with both simulation and experimental results. The simulation on the ideal cavity shape with both FishPact and MultiPac2.1 codes shows that multipacting appears in a very small region near equator where the weld seam exists. A simulation with more realistic cavity shape considering the weld seam at cell equators has also been done out showing similar results for end cell but a remarkable mitigation for inner cell. During the vertical tests at LASA, Multipacting is frequently observed but with no limitation to the cavity performance, which well confirms the MP predicted by the simulations.
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MOPVA118	Impact of Trapped Magnetic Flux and Thermal Gradients on the Performance of Nb3Sn Cavities	cavity, niobium, target, operation	1127
	D.L. Hall, M. Liepe Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA D. Liarte, J.P. Sethna Cornell University, Ithaca, New York, USA
	Trapped magnetic flux is known to degrade the quality factor of superconducting cavities by increasing the surface losses ascribed to the residual resistance. In Nb3Sn cavities, which consist of a thin layer of Nb3Sn coated on a bulk niobium substrate, the bimetallic interface results in a thermal current being generated in the presence of a thermal gradient, which will in turn generate flux that can be trapped. In this paper we quantify the impact of trapped flux, from either ambient fields or thermal gradients, on the performance of the cavity. We discover that the sensitivity to trapped flux, a measure of the increase in residual resistance as a function of the amount of flux trapped, is a function of the accelerating gradient. A theoretical framework to explain this phenomenon is proposed, and the impact on the requirements for operating a Nb3Sn cavity in a cryomodule are considered.
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MOPVA119	Surface Analysis of Features Seen on Nb3Sn Sample Coupons Grown by Vapour Diffusion	niobium, SRF, simulation, cavity	1130
	D.L. Hall, M. Liepe, J.T. Maniscalco, R.D. Porter Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA T. Arias, P. Cueva, D.A. Muller, N. Sitaraman Cornell University, Ithaca, New York, USA
	As a high-kappa superconductor with a coherence length of 7 nm, the superconductor Nb3Sn is highly susceptible to material features at the sub-micron scale. For niobium surfaces coated with a thin layer of Nb3Sn using the vapour diffusion method, the polycrystalline nature of the film grown lends to the possibility that performance-degrading non-uniformities may develop. In particular, regions of insufficiently thick coating and tin-depletion have been seen to occur in sample coupons. In the interests of understanding how to control the presence and nature of such features, it is necessary to know how they form. In this paper we stop the coating at defined instances to gain a stop-motion image of the growth of the layer, and use SEM and TEM techniques to image the development of the features seen in previously coated samples. We demonstrate that surface pre-anodisation can suppress the formation of thin film regions, and apply this technique to a single-cell cavity. Contemporarily, we use TEM with EDS mapping to monitor grain boundaries and tin-depleted regions within the layer.
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TUPAB087	Undulator Commissioning Experience at PAL-XFEL	undulator, electron, background, radiation	1520
	D.E. Kim, Y.G. Jung, H.-S. Kang, I.S. Ko, H.-G. Lee, S.B. Lee, W.W. Lee, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea I.S. Ko POSTECH, Pohang, Kyungbuk, Republic of Korea J. Pflüger XFEL. EU, Hamburg, Germany
	Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. The hard X-ray undulator line requires 20 units of 5 m long hybrid-type conventional planar undulator while soft X-ray line requires 7 units of 5 m long hybrid type planar undulators. In this report, the final measurement results of all the undulators, phase matching scheme, and the commissioning experiences will be summarized.
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TUPAB103	Orbit Correction With Path Length Compensation Based on Rf Frequency Adjusments in TPS	operation, electron, feedback, photon	1553
	P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, C.-C. Kuo, C.C. Liang, Y.-C. Liu, H.-J. Tsai, F.H. Tseng NSRRC, Hsinchu, Taiwan
	The 3 GeV Taiwan Photon Source has been routinely operated for public users since September 2016. Orbit reproducibility and stability are critical for the quality of user experiments. Ambient temperature variations and earth tides can cause a change in circumference, changing in turn the beam energy, and orbit drift. Therefore both, orbit correction and rf frequency adjustments are necessary to keep the ring circumference constant. A Fast Orbit Feedback (FOFB) system combined with rf frequency correction deduced from the fast corrector strengths is applied to the FOFB routine. The correlation between the measured frequency variation with ambient temperature and earth tides is also reported in this article.
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TUPVA127	Optimisation of the Design of the Future Circular Collider from a Civil Engineering Perspective	civil-engineering, collider, lattice, alignment	2392
	J.L. Stanyard, V. Mertens, J.A. Osborne CERN, Geneva, Switzerland Y. Loo, C. Sturzaker, M. Sykes ARUP, London, United Kingdom
	This paper describes the role of civil engineering in the optimisation of the design of CERN's Future Circular Collider (FCC). The civil engineering team at CERN have employed a bespoke, interactive, geological tool to consider the suitability of multiple layout options for the FCC, situated in the Geneva Basin, in particular quasi-circular options with circumferences in the order of 100 km. The tool has been used to provide feedback on potential lattice designs that are assessed based on criteria such as geological risk, shaft depth and the environmental sensitivities of access and experimental sites. This paper presents the process and some results of the impact of civil engineering on the design of the FCC, in particular on the layout, location, and structural requirements, and also how the optimised design has been used as the basis for a cost and schedule study.
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WEPAB099	Development of the Manufacturing and QA Processes for the LCLS-II Injector Source VHF Electron Gun	gun, operation, electron, cavity	2815
	J.A. Doyle, J.N. Corlett, M.J. Johnson, R. Kraft, T.D. Kramasz, D. Leitner, S.P. Virostek LBNL, Berkeley, California, USA
	Funding: * This work is supported by the Office of Science, United States Department of Energy under DOE contract DE-AC02-05CH11231. The Linear Coherent Light Source-II (LCLS-II), a new free electron laser currently under construction at SLAC, requires a high repetition rate, high brightness, continuous wave electron source. Lawrence Berkeley National Laboratory (LBNL) has developed a design for a normal conducting VHF gun in response to that need and is responsible for its production and that of the associated beamline, with much of the fabrication done in-house. The 186 MHz copper cavity dissipates approximately 90 kW of RF power while maintaining a vacuum pressure on the order of 10^-10 Torr. The gun is a critical component that requires a very high level of operational reliability to ensure uninterrupted availability for future system users. A quality assurance system to instruct manufacturing and change control is vital to ensure production of a gun that reliably meets physics requirements over an extended period of usage. This paper describes the QA processes developed for fabrication and assembly of the Injector Source electron gun along with results and lessons learned from their current implementation.
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WEPVA029	SIS100 Tunnel Design and Status	radiation, shielding, operation, extraction	3316
	C. Omet, J. Falenski, G. Fehrenbacher, H. Kisker, K. Konradt, A. Sokolov, P.J. Spiller GSI, Darmstadt, Germany A. Fischer FAIR, Darmstadt, Germany
	As the FAIR project is proceeding, many of the building and tunnel designs in the meanwhile are frozen and documents are prepared for tendering. For the future FAIR driver accelerator, SIS100, the accelerator tunnel T110 comprises a 1100 m long tunnel, which has a depth of 17 m under ground. In this paper, its environmental boundary conditions, design principles and the finally chosen layout are presented.
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WEPVA084	Performance of the PAL-XFEL High Precision Magnet Power Supplies	controls, operation, power-supply, status	3452
	S.-H. Jeong, J.H. Han, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-G. Lee, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea
	In the PAL-XFEL, 632 magnet power supplies (MPS) have been operated since 2016. High current unipolar MPSs(>100A) were configured buck mode with single power stack or two. The corrector MPSs for low current were the H-bridge type for bipolar current driving. The nine different types of MPS were installed for beam dy-namics in the PAL-XFEL machine. All MPSs had been tested and confirmed their performances before installa-tion. We described here the status of the MPS operation after installation on 2016.
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WEPVA129	Arc-Flash Hazard and Protection for Electric Switchboard at NSRRC	detector, photon, power-supply, impedance	3571
	T.-S. Ueng, Y.F. Chiu, C.K. Kuan, K.C. Kuo, Y.-C. Lin NSRRC, Hsinchu, Taiwan
	During the operation of electrical equipment the arc-flash accident could damage the equipment and endanger the working personnel. In order to prevent this type of accidents from happening and to minimize the damages, a delicate setup is being installed inside the electric switchboard for suppressing the accidents at the initial stage of arcing at NSRRC's power system. The installed device includes the arc sensor, the smoke detector, the high rupturing capacity fuse, the circuit breaker and the protection relay. Further improvement on preventing the arc-flash accidents is also under study.
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THOAB2	MicroTCA Technology Lab at DESY: Start-Up Phase Summary	operation, electronics, hardware, FPGA	3659
	T. Walter, M. Fenner, K. Kull, H. Schlarb DESY, Hamburg, Germany
	Funding: The MicroTCA Technology Lab at DESY is a Helmholtz Innovation Lab (HIL-02) and jointly funded by DESY, the Helmholtz Association, and industry. Over the last decade, technology transfer has emerged as an important mission of major public research facilities. Funding agencies, regional governments and society at large have placed high hopes in the combination of scientific research and on-site technology transfer departments that can turn discoveries and research tools into marketable products. Pursuing economic interests while preserving scientific freedom is a delicate balancing act that requires novel instruments in finance, administration and governance. The Helmholtz Association of German Research Centres addressed this challenge with a set of new frameworks: the Helmholtz Validation Funds (HVF) and the Helmholtz Innovation Labs (HIL). MicroTCA is a case in point: Since 2009, DESY has upgraded this standard significantly to provide state-of-the-art LLRF systems for the facilities FLASH and European XFEL. When the technology sparked interest elsewhere, DESY bundled its transfer activities in the HVF project MicroTCA.4 for Industry (2012-2015) and the HIL project MicroTCA Technology Lab (since October 2016). We report on intermediate results achieved by the MicroTCA Technology Lab after seven months of operation.
	Slides THOAB2 [6.655 MB]
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THPIK090	352 MHz Tetrode RF Stations for Superconducting Spoke Cavities	linac, controls, power-supply, operation	4296
	M. Jobs, K.J. Gajewski, V.A. Goryashko, H. Li, R.J.M.Y. Ruber, R. Wedberg Uppsala University, Uppsala, Sweden
	Two 352 MHz tetrode based RF stations for pulsed operation have been developed at the FREIA Laboratory, Uppsala University to validate the design and performance as RF source for the Spoke cavities in the first superconductive stage of the European Spallation Source(ESS) linear accelerator. The stations use dual TH595 tetrodes rated at 210 kW peak-power to provide a total power of 400 kW with a maximum pulse duration of 3.5 ms at 14 Hz repetition rate. Each tetrode is fed by a 10 kW solid state amplifier and the station is monitored by an internal control system with complete remote access. Extensive measurements have been performed on the RF performance, the power supplies as well as on the interlock systems. To conform to the specifications, special attention must be given for the response time of the tetrode power-supplies to acquire good quality RF output pulses. For the interlock system any shut-down condition due to tube malfunctioning or other sources must switch off the station in a controlled manner with minimal damage to any internal circuitry or to the tube itself whilst at the same time provide a fast discharge and cut-off of all relevant power supplies.
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THPIK108	Bead Pull Measurements of the FETS RFQ at RAL	rfq, cavity, quadrupole, radio-frequency	4349
	W. Promdee, T.R. Edgecock IIAA, Huddersfield, United Kingdom G.E. Boorman Royal Holloway, University of London, Surrey, United Kingdom G.E. Boorman JAI, Egham, Surrey, United Kingdom T.R. Edgecock, J.K. Pozimski STFC/RAL, Chilton, Didcot, Oxon, United Kingdom A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J.K. Pozimski Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	A Radio Frequency Quadrupole (RFQ) is a part of the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL), Didcot, UK. The aim of the FETS project is to produce a 60 mA H⁻ beam at 3 MeV. The RFQ is a four-vane type with 4 modules, each of 1 m length, and is designed to accelerate the beam from 65 keV to 3 MeV at 324 MHz. A bead pull system has been designed to measure the field along the RFQ. This will be used in conjunction with 64 tuners to produce a uniform field. In order to optimise the tuning procedure, a model of the RFQ has been creat-ed in COMSOL Multiphysics. This study shows the results from the bead pull measurements and the tuning studies.
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THPVA093	Open XAL Status Report 2017	GUI, software, controls, interface	4676
	A.P. Zhukov, C.K. Allen, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA D.A. Brown NMSU, Las Cruces, New Mexico, USA Y.-C. Chao SLAC, Menlo Park, California, USA C.P. Chu, Y. Li IHEP, Beijing, People's Republic of China J.F. Esteban Müller, B.T. Folsom, E. Laface, Y.I. Levinsen, C. Rosati ESS, Lund, Sweden P. Gillette, P. Laurent, E. Lécorché, G. Normand GANIL, Caen, France I. List, M. Pavleski Cosylab, Ljubljana, Slovenia X.H. Lu CSNS, Guangdong Province, People's Republic of China J.E. Muller CERN, Geneva, Switzerland
	The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010 The goal of the collaboration is to establish Open XAL as a multi-purpose software platform supporting a broad range of tool and application development in accelerator physics (Open XAL also ships with a suite of general purpose accelerator applications). This paper discusses progress in beam dynamics simulation, interaction with control system and software organization. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.
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THPVA102	Structural Analysis and Evaluation of Actual PC Bridge Using 950 keV/3.95 MeV X-Band Linacs	linac, experiment, detector, target	4701
	H. Takeuchi, R. Yano The University of Tokyo, Tokyo, Japan K. Dobashi, Y. Mitsuya, M. Uesaka The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan M. Ishida, Y. Ohshima PWRI, Ibaraki, Japan J. Kusano Accuthera Inc., Kawasaki, Kanagawa, Japan I. Ozawa The University of Tokyo, The School of Engineering, Tokyo, Japan
	Funding: This work was supported by Council for Science, Technology and Innovation(CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP) (Funding agency: JST). In Japan, bridges constructed in the highly economic growth era are facing to aging problem and advanced maintenance methods have been strongly required recently. To meet this demand, we develop the on-site inspection system using 950 keV/3.95 MeV X-band (9.3 GHz) linac X-ray sources. These systems can visualize in seconds the inner states of bridge, including cracks of concrete, location and state of tendons (wires) and other imperfections. We focused on the inspection for wires which are critical to the safety of bridge. At the on-site inspections, the X-ray inspection system exhibited sufficient accuracy to detect the wire's corrosion. We also evaluated the maximum thickness of concrete to which our system can be applied. Using the 950 keV system, we conducted on-site inspection for real bridges and performed structural analysis to evaluate the bearing capacity of the bridge using finite element method. We plan to apply the 3.95 MeV linac for actual bridge inspection to extend the applicable range in 2017. For accurate visualization, the parallel motion CT technique for bridge inspection is in progress. Mitsuru Ueaska et al, On-site nondestructive inspection by upgraded portable 950keV/3.95MeV X-band linac x-ray sources, J. Phys. B: At. Mol. Opt. Phys. 47(2014) 234008 (9pp)
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THPVA132	A Study of Potential Accelerator Production of Radioisotopes for Both Diagnostics and Therapy	proton, target, simulation, diagnostics	4765
	N. Ratcliffe, T.R. Edgecock University of Huddersfield, Huddersfield, United Kingdom
	There is currently much interest in accelerator based replacements for radioisotope production. The primary focus is the use of compact low energy (<30MeV) proton accelerators that can provide local on-site production of short lived isotopes and as a replacement for the current reactor production of important isotopes such as Ga-68. As part of a study into the viability of this production method this work undertakes a benchmarking study the GEANT4 code using the new low energy data-driven physics list QGSP_BIC_AllHP for the production of significant diagnostic and therapy isotopes such as F-18 and Ga-68. results from these simulations will be compared to experimental cross-sections and other codes to determine reliability before being used to further asses the activity producible using these reactions.
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Paper

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Other Keywords

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MOPAB084

Online Measurement of Electrode Gains for Stripline Beam Position Monitor in the HLS II Storage Ring

storage-ring, quadrupole, radiation, operation

316

F.F. Wu, L. Lin, X.Y. Liu, P. Lu, B.G. Sun, L.L. Tang, J.G. Wang, J.H. Wei, Y.L. Yang, T.Y. Zhou, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Supported by the National Key Research and Development Program of China(No. 2016YFA0402000) and the National Science Foundation of China (11575181, 11605202)
Three axially symmetric stripline beam position monitors were installed in the HLS II storage ring and each stripline BPM was machined with button BPM together. Due to mechanical errors of stripline BPM, differences in electrode gains will lead to measurement error for beam position and mutual coupling between beam horizontal position and vertical position. So it is very important to calibrate electrode gains for axially symmetric BPM. A method was proposed to calibrate electrode gains of this kind of BPM. This method is suitable for all axially symmetric BPMs, whether stripline BPM or button BPM. The online calibrated gains were compared with offline calibrated gains and the results have shown that online and offline calibrated electrode gains were basically consistent.

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MOPAB087

Study on Supports System of BPMs for HEPs

simulation, factory, storage-ring, synchrotron

322

Z.Z. Wang, J.S. Cao, J. He, H.Z. Ma, Y.F. Sui, Z. Wang
IHEP, People's Republic of China

The High Energy Photon Source(HEPS), a third generation light source with the energy of 6 GeV, is under constructed at IHEP. It has an ultralow emittance (~50pm.rad) and small beam size, thus the requirement of BPM in precision and resolution is quite high. Independent supports with high degree of mechanical and thermal stability will be employed for some special BPMs, such as the BPMs near the insert devices. The supports should have high eigen-frequencies to minimize the amplification of vibration from the ground. Vibrations information of the ground around the supports also need be estimated, with which FEA (finite element analysis) had be utilized to simulate the performance of the supports. Measurements of vibrational stability of the prototype supports have be done and compared with the simulation.

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MOPIK126

Establishing a Project Management Office for the Large Scale Multi Project FAIR

project-management, controls, interface, operation

835

F. Becker, S. Deveaux, A. Fröhlich, G. Hickler, M. Lautenschläger, M. Raponi, B. Schoenfelder, M. Strangmann, N. Winters
GSI, Darmstadt, Germany
J.R. Regler, D. Urner
FAIR, Darmstadt, Germany

The Facility for Antiproton and Ion Research (FAIR) is a large scale multi project comprising 10 subprojects in the field of accelerators (pLINAC, SIS100, SuperFRS, p-bar Separator, Collector Ring, High Energy Storage Ring), experiments (CBM, APPA, NUSTAR, PANDA) and civil construction. This contribution describes an integrated approach how a controlling type project management office (PMO) was established, meeting the overall requirements for project steering and specific requirements of the subprojects and international partners involved. Major responsibilities of the PMO are project planning, integrated reporting, cost and budget control, risk management, in-kind coordination & procurement, quality assurance & configuration management. Core processes, roles and responsibilities, methodology and interfaces internally and towards the project pillars are presented.

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MOPIK128

Integrated Project Planning as a Central Steering Tool for the Large Scale Multi Project FAIR

experiment, status, project-management, controls

842

N. Winters, F. Becker, M.V. Ricciardi
GSI, Darmstadt, Germany

The Facility for Antiproton and Ion Research (FAIR) is a large scale multi project comprising 10 subprojects in the field of accelerators (pLINAC, SIS100, SuperFRS, p-bar, CR, HESR), experiments (CBM, APPA, NUSTAR, PANDA) and civil construction. This contribution describes the fundamental revamp of FAIR integrated project planning. Main objective is to preserve the advantages of a bottom-up planning topology with the actual and detailed level of information keeping the ~400 work package leader's central role as plan owners in their field of responsibility. Simultaneously different project phases (e.g. civil construction, procurement, installation, commissioning) need to be excluded from detailed plans while being re-integrated in the level-1 project master schedule. Additional cost profiles and resource assignment by name allow a progress tracking and flexible project steering.

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MOPVA064

Multipacting Study in INFN-LASA ESS Medium-Beta Cavity

cavity, simulation, SRF, electron

1019

J.F. Chen, M. Bertucci, A. Bosotti, P. Michelato, L. Monaco, C. Pagani, R. Paparella, D. Sertore
INFN/LASA, Segrate (MI), Italy
S. Pirani
ESS, Lund, Sweden

We present Multipacting studies in ESS Medium-Beta cavities of INFN-LASA design with both simulation and experimental results. The simulation on the ideal cavity shape with both FishPact and MultiPac2.1 codes shows that multipacting appears in a very small region near equator where the weld seam exists. A simulation with more realistic cavity shape considering the weld seam at cell equators has also been done out showing similar results for end cell but a remarkable mitigation for inner cell. During the vertical tests at LASA, Multipacting is frequently observed but with no limitation to the cavity performance, which well confirms the MP predicted by the simulations.

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MOPVA118

Impact of Trapped Magnetic Flux and Thermal Gradients on the Performance of Nb3Sn Cavities

cavity, niobium, target, operation

1127

D.L. Hall, M. Liepe
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
D. Liarte, J.P. Sethna
Cornell University, Ithaca, New York, USA

Trapped magnetic flux is known to degrade the quality factor of superconducting cavities by increasing the surface losses ascribed to the residual resistance. In Nb3Sn cavities, which consist of a thin layer of Nb3Sn coated on a bulk niobium substrate, the bimetallic interface results in a thermal current being generated in the presence of a thermal gradient, which will in turn generate flux that can be trapped. In this paper we quantify the impact of trapped flux, from either ambient fields or thermal gradients, on the performance of the cavity. We discover that the sensitivity to trapped flux, a measure of the increase in residual resistance as a function of the amount of flux trapped, is a function of the accelerating gradient. A theoretical framework to explain this phenomenon is proposed, and the impact on the requirements for operating a Nb3Sn cavity in a cryomodule are considered.

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MOPVA119

Surface Analysis of Features Seen on Nb3Sn Sample Coupons Grown by Vapour Diffusion

niobium, SRF, simulation, cavity

1130

D.L. Hall, M. Liepe, J.T. Maniscalco, R.D. Porter
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
T. Arias, P. Cueva, D.A. Muller, N. Sitaraman
Cornell University, Ithaca, New York, USA

As a high-kappa superconductor with a coherence length of 7 nm, the superconductor Nb3Sn is highly susceptible to material features at the sub-micron scale. For niobium surfaces coated with a thin layer of Nb3Sn using the vapour diffusion method, the polycrystalline nature of the film grown lends to the possibility that performance-degrading non-uniformities may develop. In particular, regions of insufficiently thick coating and tin-depletion have been seen to occur in sample coupons. In the interests of understanding how to control the presence and nature of such features, it is necessary to know how they form. In this paper we stop the coating at defined instances to gain a stop-motion image of the growth of the layer, and use SEM and TEM techniques to image the development of the features seen in previously coated samples. We demonstrate that surface pre-anodisation can suppress the formation of thin film regions, and apply this technique to a single-cell cavity. Contemporarily, we use TEM with EDS mapping to monitor grain boundaries and tin-depleted regions within the layer.

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TUPAB087

Undulator Commissioning Experience at PAL-XFEL

undulator, electron, background, radiation

1520

D.E. Kim, Y.G. Jung, H.-S. Kang, I.S. Ko, H.-G. Lee, S.B. Lee, W.W. Lee, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea
I.S. Ko
POSTECH, Pohang, Kyungbuk, Republic of Korea
J. Pflüger
XFEL. EU, Hamburg, Germany

Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. The hard X-ray undulator line requires 20 units of 5 m long hybrid-type conventional planar undulator while soft X-ray line requires 7 units of 5 m long hybrid type planar undulators. In this report, the final measurement results of all the undulators, phase matching scheme, and the commissioning experiences will be summarized.

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TUPAB103

Orbit Correction With Path Length Compensation Based on Rf Frequency Adjusments in TPS

operation, electron, feedback, photon

1553

P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, C.-C. Kuo, C.C. Liang, Y.-C. Liu, H.-J. Tsai, F.H. Tseng
NSRRC, Hsinchu, Taiwan

The 3 GeV Taiwan Photon Source has been routinely operated for public users since September 2016. Orbit reproducibility and stability are critical for the quality of user experiments. Ambient temperature variations and earth tides can cause a change in circumference, changing in turn the beam energy, and orbit drift. Therefore both, orbit correction and rf frequency adjustments are necessary to keep the ring circumference constant. A Fast Orbit Feedback (FOFB) system combined with rf frequency correction deduced from the fast corrector strengths is applied to the FOFB routine. The correlation between the measured frequency variation with ambient temperature and earth tides is also reported in this article.

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TUPVA127

Optimisation of the Design of the Future Circular Collider from a Civil Engineering Perspective

civil-engineering, collider, lattice, alignment

2392

J.L. Stanyard, V. Mertens, J.A. Osborne
CERN, Geneva, Switzerland
Y. Loo, C. Sturzaker, M. Sykes
ARUP, London, United Kingdom

This paper describes the role of civil engineering in the optimisation of the design of CERN's Future Circular Collider (FCC). The civil engineering team at CERN have employed a bespoke, interactive, geological tool to consider the suitability of multiple layout options for the FCC, situated in the Geneva Basin, in particular quasi-circular options with circumferences in the order of 100 km. The tool has been used to provide feedback on potential lattice designs that are assessed based on criteria such as geological risk, shaft depth and the environmental sensitivities of access and experimental sites. This paper presents the process and some results of the impact of civil engineering on the design of the FCC, in particular on the layout, location, and structural requirements, and also how the optimised design has been used as the basis for a cost and schedule study.

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WEPAB099

Development of the Manufacturing and QA Processes for the LCLS-II Injector Source VHF Electron Gun

gun, operation, electron, cavity

2815

J.A. Doyle, J.N. Corlett, M.J. Johnson, R. Kraft, T.D. Kramasz, D. Leitner, S.P. Virostek
LBNL, Berkeley, California, USA

Funding: * This work is supported by the Office of Science, United States Department of Energy under DOE contract DE-AC02-05CH11231.
The Linear Coherent Light Source-II (LCLS-II), a new free electron laser currently under construction at SLAC, requires a high repetition rate, high brightness, continuous wave electron source. Lawrence Berkeley National Laboratory (LBNL) has developed a design for a normal conducting VHF gun in response to that need and is responsible for its production and that of the associated beamline, with much of the fabrication done in-house. The 186 MHz copper cavity dissipates approximately 90 kW of RF power while maintaining a vacuum pressure on the order of 10^-10 Torr. The gun is a critical component that requires a very high level of operational reliability to ensure uninterrupted availability for future system users. A quality assurance system to instruct manufacturing and change control is vital to ensure production of a gun that reliably meets physics requirements over an extended period of usage. This paper describes the QA processes developed for fabrication and assembly of the Injector Source electron gun along with results and lessons learned from their current implementation.

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WEPVA029

SIS100 Tunnel Design and Status

radiation, shielding, operation, extraction

3316

C. Omet, J. Falenski, G. Fehrenbacher, H. Kisker, K. Konradt, A. Sokolov, P.J. Spiller
GSI, Darmstadt, Germany
A. Fischer
FAIR, Darmstadt, Germany

As the FAIR project is proceeding, many of the building and tunnel designs in the meanwhile are frozen and documents are prepared for tendering. For the future FAIR driver accelerator, SIS100, the accelerator tunnel T110 comprises a 1100 m long tunnel, which has a depth of 17 m under ground. In this paper, its environmental boundary conditions, design principles and the finally chosen layout are presented.

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WEPVA084

Performance of the PAL-XFEL High Precision Magnet Power Supplies

controls, operation, power-supply, status

3452

S.-H. Jeong, J.H. Han, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-G. Lee, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

In the PAL-XFEL, 632 magnet power supplies (MPS) have been operated since 2016. High current unipolar MPSs(>100A) were configured buck mode with single power stack or two. The corrector MPSs for low current were the H-bridge type for bipolar current driving. The nine different types of MPS were installed for beam dy-namics in the PAL-XFEL machine. All MPSs had been tested and confirmed their performances before installa-tion. We described here the status of the MPS operation after installation on 2016.

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WEPVA129

Arc-Flash Hazard and Protection for Electric Switchboard at NSRRC

detector, photon, power-supply, impedance

3571

T.-S. Ueng, Y.F. Chiu, C.K. Kuan, K.C. Kuo, Y.-C. Lin
NSRRC, Hsinchu, Taiwan

During the operation of electrical equipment the arc-flash accident could damage the equipment and endanger the working personnel. In order to prevent this type of accidents from happening and to minimize the damages, a delicate setup is being installed inside the electric switchboard for suppressing the accidents at the initial stage of arcing at NSRRC's power system. The installed device includes the arc sensor, the smoke detector, the high rupturing capacity fuse, the circuit breaker and the protection relay. Further improvement on preventing the arc-flash accidents is also under study.

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THOAB2

MicroTCA Technology Lab at DESY: Start-Up Phase Summary

operation, electronics, hardware, FPGA

3659

T. Walter, M. Fenner, K. Kull, H. Schlarb
DESY, Hamburg, Germany

Funding: The MicroTCA Technology Lab at DESY is a Helmholtz Innovation Lab (HIL-02) and jointly funded by DESY, the Helmholtz Association, and industry.
Over the last decade, technology transfer has emerged as an important mission of major public research facilities. Funding agencies, regional governments and society at large have placed high hopes in the combination of scientific research and on-site technology transfer departments that can turn discoveries and research tools into marketable products. Pursuing economic interests while preserving scientific freedom is a delicate balancing act that requires novel instruments in finance, administration and governance. The Helmholtz Association of German Research Centres addressed this challenge with a set of new frameworks: the Helmholtz Validation Funds (HVF) and the Helmholtz Innovation Labs (HIL). MicroTCA is a case in point: Since 2009, DESY has upgraded this standard significantly to provide state-of-the-art LLRF systems for the facilities FLASH and European XFEL. When the technology sparked interest elsewhere, DESY bundled its transfer activities in the HVF project MicroTCA.4 for Industry (2012-2015) and the HIL project MicroTCA Technology Lab (since October 2016). We report on intermediate results achieved by the MicroTCA Technology Lab after seven months of operation.

Slides THOAB2 [6.655 MB]

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THPIK090

352 MHz Tetrode RF Stations for Superconducting Spoke Cavities

linac, controls, power-supply, operation

4296

M. Jobs, K.J. Gajewski, V.A. Goryashko, H. Li, R.J.M.Y. Ruber, R. Wedberg
Uppsala University, Uppsala, Sweden

Two 352 MHz tetrode based RF stations for pulsed operation have been developed at the FREIA Laboratory, Uppsala University to validate the design and performance as RF source for the Spoke cavities in the first superconductive stage of the European Spallation Source(ESS) linear accelerator. The stations use dual TH595 tetrodes rated at 210 kW peak-power to provide a total power of 400 kW with a maximum pulse duration of 3.5 ms at 14 Hz repetition rate. Each tetrode is fed by a 10 kW solid state amplifier and the station is monitored by an internal control system with complete remote access. Extensive measurements have been performed on the RF performance, the power supplies as well as on the interlock systems. To conform to the specifications, special attention must be given for the response time of the tetrode power-supplies to acquire good quality RF output pulses. For the interlock system any shut-down condition due to tube malfunctioning or other sources must switch off the station in a controlled manner with minimal damage to any internal circuitry or to the tube itself whilst at the same time provide a fast discharge and cut-off of all relevant power supplies.

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THPIK108

Bead Pull Measurements of the FETS RFQ at RAL

rfq, cavity, quadrupole, radio-frequency

4349

W. Promdee, T.R. Edgecock
IIAA, Huddersfield, United Kingdom
G.E. Boorman
Royal Holloway, University of London, Surrey, United Kingdom
G.E. Boorman
JAI, Egham, Surrey, United Kingdom
T.R. Edgecock, J.K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J.K. Pozimski
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

A Radio Frequency Quadrupole (RFQ) is a part of the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL), Didcot, UK. The aim of the FETS project is to produce a 60 mA H⁻ beam at 3 MeV. The RFQ is a four-vane type with 4 modules, each of 1 m length, and is designed to accelerate the beam from 65 keV to 3 MeV at 324 MHz. A bead pull system has been designed to measure the field along the RFQ. This will be used in conjunction with 64 tuners to produce a uniform field. In order to optimise the tuning procedure, a model of the RFQ has been creat-ed in COMSOL Multiphysics. This study shows the results from the bead pull measurements and the tuning studies.

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THPVA093

Open XAL Status Report 2017

GUI, software, controls, interface

4676

A.P. Zhukov, C.K. Allen, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA
D.A. Brown
NMSU, Las Cruces, New Mexico, USA
Y.-C. Chao
SLAC, Menlo Park, California, USA
C.P. Chu, Y. Li
IHEP, Beijing, People's Republic of China
J.F. Esteban Müller, B.T. Folsom, E. Laface, Y.I. Levinsen, C. Rosati
ESS, Lund, Sweden
P. Gillette, P. Laurent, E. Lécorché, G. Normand
GANIL, Caen, France
I. List, M. Pavleski
Cosylab, Ljubljana, Slovenia
X.H. Lu
CSNS, Guangdong Province, People's Republic of China
J.E. Muller
CERN, Geneva, Switzerland

The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010 The goal of the collaboration is to establish Open XAL as a multi-purpose software platform supporting a broad range of tool and application development in accelerator physics (Open XAL also ships with a suite of general purpose accelerator applications). This paper discusses progress in beam dynamics simulation, interaction with control system and software organization. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.

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THPVA102

Structural Analysis and Evaluation of Actual PC Bridge Using 950 keV/3.95 MeV X-Band Linacs

linac, experiment, detector, target

4701

H. Takeuchi, R. Yano
The University of Tokyo, Tokyo, Japan
K. Dobashi, Y. Mitsuya, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
M. Ishida, Y. Ohshima
PWRI, Ibaraki, Japan
J. Kusano
Accuthera Inc., Kawasaki, Kanagawa, Japan
I. Ozawa
The University of Tokyo, The School of Engineering, Tokyo, Japan

Funding: This work was supported by Council for Science, Technology and Innovation(CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP) (Funding agency: JST).
In Japan, bridges constructed in the highly economic growth era are facing to aging problem and advanced maintenance methods have been strongly required recently. To meet this demand, we develop the on-site inspection system using 950 keV/3.95 MeV X-band (9.3 GHz) linac X-ray sources*. These systems can visualize in seconds the inner states of bridge, including cracks of concrete, location and state of tendons (wires) and other imperfections. We focused on the inspection for wires which are critical to the safety of bridge. At the on-site inspections, the X-ray inspection system exhibited sufficient accuracy to detect the wire's corrosion. We also evaluated the maximum thickness of concrete to which our system can be applied. Using the 950 keV system, we conducted on-site inspection for real bridges and performed structural analysis to evaluate the bearing capacity of the bridge using finite element method. We plan to apply the 3.95 MeV linac for actual bridge inspection to extend the applicable range in 2017. For accurate visualization, the parallel motion CT technique for bridge inspection is in progress.
* Mitsuru Ueaska et al, On-site nondestructive inspection by upgraded portable 950keV/3.95MeV X-band linac x-ray sources, J. Phys. B: At. Mol. Opt. Phys. 47(2014) 234008 (9pp)

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THPVA132

A Study of Potential Accelerator Production of Radioisotopes for Both Diagnostics and Therapy

proton, target, simulation, diagnostics

4765

N. Ratcliffe, T.R. Edgecock
University of Huddersfield, Huddersfield, United Kingdom

There is currently much interest in accelerator based replacements for radioisotope production. The primary focus is the use of compact low energy (<30MeV) proton accelerators that can provide local on-site production of short lived isotopes and as a replacement for the current reactor production of important isotopes such as Ga-68. As part of a study into the viability of this production method this work undertakes a benchmarking study the GEANT4 code using the new low energy data-driven physics list QGSP_BIC_AllHP for the production of significant diagnostic and therapy isotopes such as F-18 and Ga-68. results from these simulations will be compared to experimental cross-sections and other codes to determine reliability before being used to further asses the activity producible using these reactions.

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