IPAC2017 - List of Keywords (factory)

Paper	Title	Other Keywords	Page
MOOCA2	First Results From New Single-Cell Nb3Sn Cavities Coated at Cornell University	cavity, niobium, radio-frequency, SRF	40
	D.L. Hall, J.J. Kaufman, M. Liepe, R.D. Porter, J. Sears Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Cavities coated with Nb3Sn at Cornell University demonstrate quality factors of >10¹⁰ at 4.2 K, outperforming equivalent niobium cavities by a factor of >30 at these bath temperatures. These quality factors have been maintained up to fields of 17-18 MV/m without significant Q-slope. Recently, new single-cell cavities have been added to the Cornell Nb3Sn programme in an effort to improve statistics and allow further exploration of the available parameter space. In this paper we report on the first results of these new cavities, as well as the latest performance from other cavities already in use on the programme. Furthermore, continuing work to optimise the coating procedure is reported on, and the latest understanding of the ideal coating profile is discussed.
	Slides MOOCA2 [10.366 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCA2
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MOPAB087	Study on Supports System of BPMs for HEPs	simulation, site, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB087
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MOPIK073	Calibration of Linear Optics of COSY Based on ORM Data	quadrupole, dipole, optics, sextupole	699
	C. Weidemann, M. Bai, Y. Dutheil, F. Hinder, B. Lorentz FZJ, Jülich, Germany
	The COoler SYnchrotron in Jülich is a well suited accelerator for a precursor experiment on the direct measurement of the Electric Dipole Moment (EDM) of the deuteron (see* and references within). It provides polarized and unpolarized proton and deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c, allows for phase space cooling and is highly flexible with respect to ion-optical settings. Unfortunately, a model independent linear optics measurement is not possible and so far the existing MAD-X model of COSY does not provide an agreement with the actual machine parameters that is required by future experiments, such as the EDM experiment. Significant deviations with respect to the working point and linear optics have been reported*. As shown in**, a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm in a C++ program was successfully developed and carefully benchmarked. This contribution presents the application of the new program on measured ORM data and its capabilities in calibrating linear optics as well as reconstructing machine imperfections such as gradient errors of quadrupole magnets and calibration factors of BPMs and steerers. D. Eversmann et al., PRL 115, no. 9, 094801 (2015). R. Maier, NIM A 390, 1 (1997). * C. Weidemann et al., PRSTAB 18, 020101 (2015). ** D. Ji et al., IPAC16, doi:10.18429/JACoW-IPAC2016-TUPMR026. *** C. Weidemann et al., IPAC16, doi:10.18429/JACoW-IPAC2016-THPMB009.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK073
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MOPIK117	On the Computation of Phase and Energy Gain for a Thin-Lens RF Gap Using a General Field Profile	simulation, linac, acceleration, cavity	810
	C.K. Allen ORNL, Oak Ridge, Tennessee, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract number DE-AC05-00OR22725. The thin-lens representation for an RF accelerating gap has been well developed and is documented by Lapostolle [5], Weiss [6], Wangler [14], and others [9], [10]. These models assume that the axial electric field is both centered and symmetric so it has a cosine expansion. Presented here is a model that considers general axial fields. Both the cosine and sine transit time factors are required plus their Hilbert transforms. The combination yields a complex Hamiltonian rotating in the complex plane with the synchronous phase. The phase and energy gains are computed in the pre-gap and post-gap regions then aligned with asymptotic values of wave number. Derivations are outlined, examples are shown, and simulations presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK117
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MOPIK127	FAIR Risk Management as a Proactive Steering Tool for the Large Scale Multi Project	experiment, project-management, antiproton, ion	839
	S. Deveaux, F. Becker 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 separator, Collector Ring, High Energy Storage Ring), experiments (CBM, APPA, NUSTAR, PANDA) and civil construction. This contribution describes the implementation of a progressive risk management methodology based on a comprehensive assessment on work package level. Complexity factors (number of parts, level of state of the art, level of human interfaces, level of operational complexity) and importance factors (safety, cost, schedule, resources) represent the likelihood of risk occurrence and the eventual value at risk. Relative comparison of the normalized factors together with a supplier assessment enables to derive an event based risk register with a standardized evaluation scheme assigning risk and opportunity classes. This contribution demonstrates the full methodology highlighting some typical examples of the FAIR project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK127
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TUPIK038	Muon Sources for Particle Physics - Accomplishments of MAP	collider, experiment, proton, target	1766
	D.V. Neuffer, D. Stratakis Fermilab, Batavia, Illinois, USA M.A. Cummings Muons, Inc, Illinois, USA J.-P. Delahaye SLAC, Menlo Park, California, USA M.A. Palmer BNL, Upton, Long Island, New York, USA R.D. Ryne LBNL, Berkeley, California, USA D.J. Summers UMiss, University, Mississippi, USA
	Funding: supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the U. S. Department of Energy. The Muon Accelerator Program (MAP) completed a four-year study on the feasibility of muon colliders and on using stored muon beams for neutrinos. That study was broadly successful in its goals, establishing the feasibility of lepton colliders from the 125 GeV Higgs Factory to more than 10 TeV, as well as exploring using a ' storage ring (MSR) for neutrinos, and establishing that MSRs could provide factory-level intensities of 'e (''e) and ''' ('') beams. The key components of the collider and neutrino factory systems were identified. Feasible designs and detailed simulations of all of these components were obtained, including some initial hardware component tests, setting the stage for future implementation where resources are available and clearly associated physics goals become apparent.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK038
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TUPIK060	Human Factors in the Design of Control-Rooms for ESS	controls, operation, target, interface	1830
	P. Le Darz, S.G. Collier, M. Rosenqvist IFE, Halden, Norway
	Funding: The Research Council of Norway [ForskningsrÃ¥det] Norway contributes in kind to the building of ESS. Part of this work concerns the human factors aspects of the control-rooms for the operators of the machine. IFE is applying international standards on human factors (e.g., ISO 11064) to the design of the main control-room (MCR) and a local control-room (LCR). The work is also intended to satisfy regulatory requirements. So far, for the MCR, we have completed a concept design. User requirements clarification involved interviews with stakeholders and visits to similar facilities. Concept design for the MCR was iterative and involved a user reference-group set up for the project. During several workshops, alternatives for layout and workstations were discussed and modeled using 3D graphics. The chosen concept design and 3D model were then checked against standards. The resulting design was approved by the user-group and now goes forward to detailed design and realization. We have also completed detailed design of the LCR so that it is available for commissioning before the MCR is built. IFE also contributes to the human-machine interface design in other projects, such as for alarm system design and a logbook software application.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK060
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WEPIK009	Collimators for SuperKEKB Main Ring	impedance, background, positron, HOM	2929
	T. Ishibashi, Y. Suetsugu, S. Terui KEK, Ibaraki, Japan
	SuperKEKB, which is an upgrade project of KEKB, is an electron-positron collider with extremely high luminosity. Collimators (movable masks) for SuperKEKB have been designed to fit an antechamber scheme of the vacuum system and will be operated to improve backgrounds in the particle detector named Belle II. We are developing two types of collimators; a horizontal and vertical collimator. The collimator has a pair of horizontally or vertically opposed movable jaws with RF fingers. Each jaw travels independently through 5-25 mm horizontally or 2-12 mm vertically in a distance between the beam axis and the tip of the jaw. SuperKEKB will operate with high currents of short bunch lengths, therefore it is important to estimate and decrease the impedance of the collimators. Two horizontal collimators were already installed in the positron ring and operated during Phase-1 commissioning for approximately 5 months, from February to June 2016. In this presentation, the latest design, and the results in the Phase-1 commissioning are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK009
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WEPIK107	Comparison Studies of Graphene Sey Results in NSRL and DL	electron, gun, synchrotron, laser	3196
	J. Wang, Y. Wang, B. Zhang, Y.X. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China B.S. Sian, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom P.V. Tyagi STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom R. Valizadeh, G.X. Xia Cockcroft Institute, Warrington, Cheshire, United Kingdom G.X. Xia UMAN, Manchester, United Kingdom G.L. Yu University of Manchester, Manchester, United Kingdom
	Graphene has many excellent properties, such as high electron carrier mobility, good thermal conductivity and transparency etc. The secondary electron yield (SEY) of graphene with copper substrate had been studied in National Synchrotron Radiation Laboratory (NSRL) of China. The results show that the maximum SEY ('max) of 6~8 layers graphene film with copper substrates is about 1.25. Further studies indicate that many factors can affect the SEY test results. The recent SEY tests of graphene films with copper substrates in Daresbury Laboratory (DL) of UK gave the maximum SEY of as-received copper, graphene samples with copper substrates are 1.89, 1.83, and 1.68, respectively, under the incident charge per unit surface (Q) of 7.6×10^-8 C 'mm-2. Meanwhile, the SEY test parameters and measurement results of graphene in both laboratories are compared and analysed. The effect of defects on the SEY results of graphene films with copper substrate is also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK107
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WEPVA055	Pre Orbit Correction Based on Tunnel Level Measurement in SuperKEKB	alignment, optics, coupling, emittance	3385
	A. Morita, H. Koiso, Y. Ohnishi, H. Sugimoto KEK, Ibaraki, Japan
	The SuperKEKB accelerator tunnel has about 30mm displacement in the vertical direction. From the result of optics correction simulation with the tunnel displacement, it was decided that the beamline components align against the smoothed line of the measured tunnel level in order to save the alignment cost and time. In order to compensate the large tunnel displacement, the pre orbit correction based on the tunnel level measurement is applied at the beginning of the phase-1 commissioning, and the beam circulation is achieved with the small number of magnet adjustments. We report the result of the pre orbit correction.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA055
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WEPVA071	Preliminary Conceptual Study of Next Generation Tau-Charm Factory at China	luminosity, collider, positron, electron	3436
	Q. Luo USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China 11375178 and the Fundamental Research Funds for the Central Universities, Grant No WK2310000046 As BEPC II would accomplish its mission in the next decade, research on high energy science demands a successor. The luminosity of this successor should be one or two orders higher than BEPC II, while the electron beam should be longitudinal polarized at the IP. This paper discusses the feasibility and key technologies of the next tau-charm collider: a greenfield new facility or an upgrade of BEPC II.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA071
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WEPVA143	Cooling-down and Cooling of Superconducting Magnets at 4.5K with Very Little Liquid Helium using Coolers*	cryogenics, cyclotron, superconducting-magnet, solenoid	3606
	M.A. Green, S. Chouhan FRIB, East Lansing, USA
	Funding: This work is supported in part by a grant from the National Science Foundation. The Michigan State University grant number is PHY0958726. Because liquid helium is often in short supply, it is often difficult to get helium for cooling superconducting magnets that are too large to be cryogen free magnets. Grade A helium is often available in high-pressure bottles, but not in large quantities. This report describes how one can cool-down and maintain a constant temperature of ~4.5 K in a superconducting magnet that has less than 5 L of liquid in the cryostat once it has been filled with liquid helium. One can do this with either GM coolers in the drop-in mode with pulsed tube coolers. The number of coolers needed to cool the magnet depends to the heat load at 4.5 K and the desired cool-down time for the magnet system. This type of cooling system is suitable for magnets that are away from a conventional large helium refrigeration system. Examples are S/C insertion (wigglers and undulators), spectrometer magnets, and ECR ion source magnets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA143
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THPAB057	Method to Calculate the Longitudinal Impedance From a Partial Wakefield Simulation	impedance, wakefield, simulation, cavity	3844
	N.C. Shipman UMAN, Manchester, United Kingdom G. Burt Cockcroft Institute, Lancaster University, Lancaster, United Kingdom R. Calaga CERN, Geneva, Switzerland J.A. Mitchell Lancaster University, Lancaster, United Kingdom
	When simulating modes with high Q-factors, the wakefield length necessary to calculate the impedance spectrum can often mean a computation time of several weeks or more. A method has been developed which enables the longitudinal impedance and Q-factors of multiple modes to be calculated from a partially decayed wakefield simulation. This paper presents an overview of the method along with preliminary, proof of principle, results showing that considerable simulation time can be saved whilst maintaining a good degree of accuracy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB057
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THPIK084	Results from the 704 MHz Klystron and Multi-beam IOT Prototypes for the European Spallation Source	klystron, linac, operation, electron	4282
	M. Jensen, C. Marrelli ESS, Lund, Sweden
	The European Spallation Source, currently under construction in Lund, Sweden, will contain 155 RF sources for proton beam acceleration. Of these, 120 are at 704 MHz. Each cavity will be powered by individual RF sources. The nominal beam pulse width is 2.86 ms and the RF systems are being specified for a pulse width up to 3.5 ms to allow for ramping and time for regulation. The repetition frequency is 14 Hz which results in 5% duty. The 704 MHz linac is divided into two sections, the medium beta and the high beta cavities. For schedule reasons, the medium beta linac, 36 RF sources, will be based on 1.5 MW pulsed power klystrons and the high beta section, 84 RF sources, is planned to be operated with 1.2 MW multi-beam IOTs. ESS ordered three klystron prototypes designed for the ESS parameters from different supplies and two multi-beam IOT technology demonstrators under two different contracts. We present the specifications for the amplifiers and the results of the klystron prototypes and report the result of the first 1.2 MW multi-beam IOT prototypes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK084
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THPVA051	Vibration Study of Magnet Girder of the HEPS-TF	photon, experiment, quadrupole, emittance	4554
	Z. Wang, C. H. Li, H. Qu, H. Wang IHEP, Beijing, People's Republic of China
	Abstract: There are stringent requirements on beam stability in the High Energy Photon Source (HEPS). The stability of the magnet girder is an extremely important factor for the beam stability. This paper will discuss the influence of ground vibration to the beam stability. This influence will determine the scope of the vibration magnification of the magnet girder. By improving the stiffness of the magnet girder, the influence will be reduced and the beam stability shall be improved. Besides, the progress of the HEPS-TF girder prototype and the vibration test will be described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA051
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FRYBA1	From Niels Bohr to Quantum Computing	operation, coupling, controls, electron	4852
	K. Mølmer AU, Aarhus, Denmark
	The development and use of accelerators for research has been closely linked to an era of modern physics which of course includes quantum mechanics. Niels Bohr was one of the foreground figures in the development of quantum mechanics and the IPAC community would like to recognise his contributions to this field in 2017, when IPAC takes place in Copenhagen, where he was active. Quantum computing is a subject of enormous potential and interest, and we would like to hear about the historical links to Niels Bohr and the so called Copenhagen School of Quantum Mechanics, and what we realistically can expect from this development.
	Slides FRYBA1 [2.490 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-FRYBA1
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Paper

Title

Other Keywords

Page

MOOCA2

First Results From New Single-Cell Nb3Sn Cavities Coated at Cornell University

cavity, niobium, radio-frequency, SRF

40

D.L. Hall, J.J. Kaufman, M. Liepe, R.D. Porter, J. Sears
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Cavities coated with Nb3Sn at Cornell University demonstrate quality factors of >10¹⁰ at 4.2 K, outperforming equivalent niobium cavities by a factor of >30 at these bath temperatures. These quality factors have been maintained up to fields of 17-18 MV/m without significant Q-slope. Recently, new single-cell cavities have been added to the Cornell Nb3Sn programme in an effort to improve statistics and allow further exploration of the available parameter space. In this paper we report on the first results of these new cavities, as well as the latest performance from other cavities already in use on the programme. Furthermore, continuing work to optimise the coating procedure is reported on, and the latest understanding of the ideal coating profile is discussed.

Slides MOOCA2 [10.366 MB]

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MOPAB087

Study on Supports System of BPMs for HEPs

simulation, site, 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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MOPIK073

Calibration of Linear Optics of COSY Based on ORM Data

quadrupole, dipole, optics, sextupole

699

C. Weidemann, M. Bai, Y. Dutheil, F. Hinder, B. Lorentz
FZJ, Jülich, Germany

The COoler SYnchrotron in Jülich is a well suited accelerator for a precursor experiment on the direct measurement of the Electric Dipole Moment (EDM) of the deuteron (see* and references within). It provides polarized and unpolarized proton and deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c**, allows for phase space cooling and is highly flexible with respect to ion-optical settings***. Unfortunately, a model independent linear optics measurement is not possible and so far the existing MAD-X model of COSY does not provide an agreement with the actual machine parameters that is required by future experiments, such as the EDM experiment. Significant deviations with respect to the working point and linear optics have been reported****. As shown in*****, a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm in a C++ program was successfully developed and carefully benchmarked. This contribution presents the application of the new program on measured ORM data and its capabilities in calibrating linear optics as well as reconstructing machine imperfections such as gradient errors of quadrupole magnets and calibration factors of BPMs and steerers.
* D. Eversmann et al., PRL 115, no. 9, 094801 (2015).
** R. Maier, NIM A 390, 1 (1997).
*** C. Weidemann et al., PRSTAB 18, 020101 (2015).
**** D. Ji et al., IPAC16, doi:10.18429/JACoW-IPAC2016-TUPMR026.
***** C. Weidemann et al., IPAC16, doi:10.18429/JACoW-IPAC2016-THPMB009.

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MOPIK117

On the Computation of Phase and Energy Gain for a Thin-Lens RF Gap Using a General Field Profile

simulation, linac, acceleration, cavity

810

C.K. Allen
ORNL, Oak Ridge, Tennessee, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract number DE-AC05-00OR22725.
The thin-lens representation for an RF accelerating gap has been well developed and is documented by Lapostolle [5], Weiss [6], Wangler [14], and others [9], [10]. These models assume that the axial electric field is both centered and symmetric so it has a cosine expansion. Presented here is a model that considers general axial fields. Both the cosine and sine transit time factors are required plus their Hilbert transforms. The combination yields a complex Hamiltonian rotating in the complex plane with the synchronous phase. The phase and energy gains are computed in the pre-gap and post-gap regions then aligned with asymptotic values of wave number. Derivations are outlined, examples are shown, and simulations presented.

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MOPIK127

FAIR Risk Management as a Proactive Steering Tool for the Large Scale Multi Project

experiment, project-management, antiproton, ion

839

S. Deveaux, F. Becker
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 separator, Collector Ring, High Energy Storage Ring), experiments (CBM, APPA, NUSTAR, PANDA) and civil construction. This contribution describes the implementation of a progressive risk management methodology based on a comprehensive assessment on work package level. Complexity factors (number of parts, level of state of the art, level of human interfaces, level of operational complexity) and importance factors (safety, cost, schedule, resources) represent the likelihood of risk occurrence and the eventual value at risk. Relative comparison of the normalized factors together with a supplier assessment enables to derive an event based risk register with a standardized evaluation scheme assigning risk and opportunity classes. This contribution demonstrates the full methodology highlighting some typical examples of the FAIR project.

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TUPIK038

Muon Sources for Particle Physics - Accomplishments of MAP

collider, experiment, proton, target

1766

D.V. Neuffer, D. Stratakis
Fermilab, Batavia, Illinois, USA
M.A. Cummings
Muons, Inc, Illinois, USA
J.-P. Delahaye
SLAC, Menlo Park, California, USA
M.A. Palmer
BNL, Upton, Long Island, New York, USA
R.D. Ryne
LBNL, Berkeley, California, USA
D.J. Summers
UMiss, University, Mississippi, USA

Funding: supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the U. S. Department of Energy.
The Muon Accelerator Program (MAP) completed a four-year study on the feasibility of muon colliders and on using stored muon beams for neutrinos. That study was broadly successful in its goals, establishing the feasibility of lepton colliders from the 125 GeV Higgs Factory to more than 10 TeV, as well as exploring using a ' storage ring (MSR) for neutrinos, and establishing that MSRs could provide factory-level intensities of 'e (''e) and ''' ('') beams. The key components of the collider and neutrino factory systems were identified. Feasible designs and detailed simulations of all of these components were obtained, including some initial hardware component tests, setting the stage for future implementation where resources are available and clearly associated physics goals become apparent.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK038

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TUPIK060

Human Factors in the Design of Control-Rooms for ESS

controls, operation, target, interface

1830

P. Le Darz, S.G. Collier, M. Rosenqvist
IFE, Halden, Norway

Funding: The Research Council of Norway [ForskningsrÃ¥det]
Norway contributes in kind to the building of ESS. Part of this work concerns the human factors aspects of the control-rooms for the operators of the machine. IFE is applying international standards on human factors (e.g., ISO 11064) to the design of the main control-room (MCR) and a local control-room (LCR). The work is also intended to satisfy regulatory requirements. So far, for the MCR, we have completed a concept design. User requirements clarification involved interviews with stakeholders and visits to similar facilities. Concept design for the MCR was iterative and involved a user reference-group set up for the project. During several workshops, alternatives for layout and workstations were discussed and modeled using 3D graphics. The chosen concept design and 3D model were then checked against standards. The resulting design was approved by the user-group and now goes forward to detailed design and realization. We have also completed detailed design of the LCR so that it is available for commissioning before the MCR is built. IFE also contributes to the human-machine interface design in other projects, such as for alarm system design and a logbook software application.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK060

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WEPIK009

Collimators for SuperKEKB Main Ring

impedance, background, positron, HOM

2929

T. Ishibashi, Y. Suetsugu, S. Terui
KEK, Ibaraki, Japan

SuperKEKB, which is an upgrade project of KEKB, is an electron-positron collider with extremely high luminosity. Collimators (movable masks) for SuperKEKB have been designed to fit an antechamber scheme of the vacuum system and will be operated to improve backgrounds in the particle detector named Belle II. We are developing two types of collimators; a horizontal and vertical collimator. The collimator has a pair of horizontally or vertically opposed movable jaws with RF fingers. Each jaw travels independently through 5-25 mm horizontally or 2-12 mm vertically in a distance between the beam axis and the tip of the jaw. SuperKEKB will operate with high currents of short bunch lengths, therefore it is important to estimate and decrease the impedance of the collimators. Two horizontal collimators were already installed in the positron ring and operated during Phase-1 commissioning for approximately 5 months, from February to June 2016. In this presentation, the latest design, and the results in the Phase-1 commissioning are presented.

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WEPIK107

Comparison Studies of Graphene Sey Results in NSRL and DL

electron, gun, synchrotron, laser

3196

J. Wang, Y. Wang, B. Zhang, Y.X. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China
B.S. Sian, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
P.V. Tyagi
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
R. Valizadeh, G.X. Xia
Cockcroft Institute, Warrington, Cheshire, United Kingdom
G.X. Xia
UMAN, Manchester, United Kingdom
G.L. Yu
University of Manchester, Manchester, United Kingdom

Graphene has many excellent properties, such as high electron carrier mobility, good thermal conductivity and transparency etc. The secondary electron yield (SEY) of graphene with copper substrate had been studied in National Synchrotron Radiation Laboratory (NSRL) of China. The results show that the maximum SEY ('max) of 6~8 layers graphene film with copper substrates is about 1.25. Further studies indicate that many factors can affect the SEY test results. The recent SEY tests of graphene films with copper substrates in Daresbury Laboratory (DL) of UK gave the maximum SEY of as-received copper, graphene samples with copper substrates are 1.89, 1.83, and 1.68, respectively, under the incident charge per unit surface (Q) of 7.6×10^-8 C 'mm-2. Meanwhile, the SEY test parameters and measurement results of graphene in both laboratories are compared and analysed. The effect of defects on the SEY results of graphene films with copper substrate is also discussed.

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WEPVA055

Pre Orbit Correction Based on Tunnel Level Measurement in SuperKEKB

alignment, optics, coupling, emittance

3385

A. Morita, H. Koiso, Y. Ohnishi, H. Sugimoto
KEK, Ibaraki, Japan

The SuperKEKB accelerator tunnel has about 30mm displacement in the vertical direction. From the result of optics correction simulation with the tunnel displacement, it was decided that the beamline components align against the smoothed line of the measured tunnel level in order to save the alignment cost and time. In order to compensate the large tunnel displacement, the pre orbit correction based on the tunnel level measurement is applied at the beginning of the phase-1 commissioning, and the beam circulation is achieved with the small number of magnet adjustments. We report the result of the pre orbit correction.

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WEPVA071

Preliminary Conceptual Study of Next Generation Tau-Charm Factory at China

luminosity, collider, positron, electron

3436

Q. Luo
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Work supported by National Natural Science Foundation of China 11375178 and the Fundamental Research Funds for the Central Universities, Grant No WK2310000046
As BEPC II would accomplish its mission in the next decade, research on high energy science demands a successor. The luminosity of this successor should be one or two orders higher than BEPC II, while the electron beam should be longitudinal polarized at the IP. This paper discusses the feasibility and key technologies of the next tau-charm collider: a greenfield new facility or an upgrade of BEPC II.

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WEPVA143

Cooling-down and Cooling of Superconducting Magnets at 4.5K with Very Little Liquid Helium using Coolers*

cryogenics, cyclotron, superconducting-magnet, solenoid

3606

M.A. Green, S. Chouhan
FRIB, East Lansing, USA

Funding: This work is supported in part by a grant from the National Science Foundation. The Michigan State University grant number is PHY0958726.
Because liquid helium is often in short supply, it is often difficult to get helium for cooling superconducting magnets that are too large to be cryogen free magnets. Grade A helium is often available in high-pressure bottles, but not in large quantities. This report describes how one can cool-down and maintain a constant temperature of ~4.5 K in a superconducting magnet that has less than 5 L of liquid in the cryostat once it has been filled with liquid helium. One can do this with either GM coolers in the drop-in mode with pulsed tube coolers. The number of coolers needed to cool the magnet depends to the heat load at 4.5 K and the desired cool-down time for the magnet system. This type of cooling system is suitable for magnets that are away from a conventional large helium refrigeration system. Examples are S/C insertion (wigglers and undulators), spectrometer magnets, and ECR ion source magnets.

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THPAB057

Method to Calculate the Longitudinal Impedance From a Partial Wakefield Simulation

impedance, wakefield, simulation, cavity

3844

N.C. Shipman
UMAN, Manchester, United Kingdom
G. Burt
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
R. Calaga
CERN, Geneva, Switzerland
J.A. Mitchell
Lancaster University, Lancaster, United Kingdom

When simulating modes with high Q-factors, the wakefield length necessary to calculate the impedance spectrum can often mean a computation time of several weeks or more. A method has been developed which enables the longitudinal impedance and Q-factors of multiple modes to be calculated from a partially decayed wakefield simulation. This paper presents an overview of the method along with preliminary, proof of principle, results showing that considerable simulation time can be saved whilst maintaining a good degree of accuracy.

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THPIK084

Results from the 704 MHz Klystron and Multi-beam IOT Prototypes for the European Spallation Source

klystron, linac, operation, electron

4282

M. Jensen, C. Marrelli
ESS, Lund, Sweden

The European Spallation Source, currently under construction in Lund, Sweden, will contain 155 RF sources for proton beam acceleration. Of these, 120 are at 704 MHz. Each cavity will be powered by individual RF sources. The nominal beam pulse width is 2.86 ms and the RF systems are being specified for a pulse width up to 3.5 ms to allow for ramping and time for regulation. The repetition frequency is 14 Hz which results in 5% duty. The 704 MHz linac is divided into two sections, the medium beta and the high beta cavities. For schedule reasons, the medium beta linac, 36 RF sources, will be based on 1.5 MW pulsed power klystrons and the high beta section, 84 RF sources, is planned to be operated with 1.2 MW multi-beam IOTs. ESS ordered three klystron prototypes designed for the ESS parameters from different supplies and two multi-beam IOT technology demonstrators under two different contracts. We present the specifications for the amplifiers and the results of the klystron prototypes and report the result of the first 1.2 MW multi-beam IOT prototypes.

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THPVA051

Vibration Study of Magnet Girder of the HEPS-TF

photon, experiment, quadrupole, emittance

4554

Z. Wang, C. H. Li, H. Qu, H. Wang
IHEP, Beijing, People's Republic of China

Abstract: There are stringent requirements on beam stability in the High Energy Photon Source (HEPS). The stability of the magnet girder is an extremely important factor for the beam stability. This paper will discuss the influence of ground vibration to the beam stability. This influence will determine the scope of the vibration magnification of the magnet girder. By improving the stiffness of the magnet girder, the influence will be reduced and the beam stability shall be improved. Besides, the progress of the HEPS-TF girder prototype and the vibration test will be described.

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FRYBA1

From Niels Bohr to Quantum Computing

operation, coupling, controls, electron

4852

K. Mølmer
AU, Aarhus, Denmark

The development and use of accelerators for research has been closely linked to an era of modern physics which of course includes quantum mechanics. Niels Bohr was one of the foreground figures in the development of quantum mechanics and the IPAC community would like to recognise his contributions to this field in 2017, when IPAC takes place in Copenhagen, where he was active. Quantum computing is a subject of enormous potential and interest, and we would like to hear about the historical links to Niels Bohr and the so called Copenhagen School of Quantum Mechanics, and what we realistically can expect from this development.

Slides FRYBA1 [2.490 MB]

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