IPAC2018 - Classification: 07 Accelerator Technology / T10 Superconducting Magnets

Paper	Title	Page
TUZGBE1	Development of a 15 T Model Dipole for a Very High Energy Hadron Collider
	A.V. Zlobin Fermilab, Batavia, Illinois, USA
	The U.S. Magnet Development Program (MDP) is developing advanced accelerator magnet technology for future hadron colliders. In this context, a 15 T Nb3Sn dipole is being built and tested at Fermilab. This invited talk presents and discusses magnet design features and results including quench performance and magnetic measurements.
	Slides TUZGBE1 [13.535 MB]
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TUZGBE2	Final-focus Superconducting Magnets for SuperKEKB	1215
	N. Ohuchi, K.A. Aoki, Y. Arimoto, M.K. Kawai, T. Kawamoto, H. Koiso, Y. Kondo, M. Masuzawa, A. Morita, S. Nakamura, Y. Ohnishi, Y. Ohsawa, T. Oki, H. Sugimoto, K. Tsuchiya, R. Ueki, X. Wang, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan M. Anerella, J. Escallier, A.K. Jain, A. Marone, B. Parker, P. Wanderer BNL, Upton, Long Island, New York, USA J. DiMarco, T.G. Gardner, J.M. Nogiec, M.A. Tartaglia, G. Velev Fermilab, Batavia, Illinois, USA T.-H. Kim Mitsubishi Electric Corp, Advanced Technology R & D Center, Hyogo, Japan
	The SuperKEKB collider aims at 40 times higher luminosity than that achieved at KEKB, based on the nano-beam scheme. The vertical beta function at the interaction point will be squeezed to 300μmeter. Final-focus superconducting magnet system which consists of eight main quadrupole magnets, 43 corrector windings, and compensation solenoids is a key component to achieve high luminosity. This invited talk presents the construction and commissioning of the final-focus magnet system.
	Slides TUZGBE2 [4.235 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE2
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WEXGBF2	Development and Operational Experience of APS Superconducting Undulators
	E. Gluskin ANL, Argonne, Illinois, USA
	Addressing a demand by Advanced Photon Source (APS) users for high-intensity circular polarized photon beams, development has begun at APS on circular polarising undulators. The first such device is currently being built for the APS storage ring. It is based on a superconducting magnet with a conventional double-helical coil structure. This helical superconducting undulator will be completed in 2017. In addition, the concept of a novel SuperConducting Arbitrarily Polarizing Emitter (SCAPE) has been suggested and is now under development. It consists of two pairs, both vertical and horizontal, of superconducting magnets assembled around a beam vacuum chamber. Such a device is capable of generating either planar or circular polarized photons, depending on which pair of magnets is energized. The SCAPE undulators could be attractive for the APS Upgrade and other fourth-generation storage rings with a multi-bend achromat lattice, as well as for FELs where utilization of round beam vacuum chambers becomes possible. This invited talk presents the status of work on the helical SCU, as well as a conceptual design of the SCAPE.
	Slides WEXGBF2 [122.418 MB]
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WEPMF014	Fast Track Actively Shielded Nb3Sn IR Quadrupole R&D	2398
	B. Parker, M. Anerella, J.P. Cozzolino, R.C. Gupta, R.B. Palmer, J. Schmalzle, H. Witte BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy. The Interaction Region (IR) magnets for future Electron Ion Colliders (EIC), such as eRHIC at BNL, JLEIC at JLab and LHeC at CERN, must satisfy strongly opposing requirements. EIC IR superconducting quadrupole coils must provide strong focusing gradients, leading to large peak fields, for the high momentum hadron beam while permitting the nearby electron beam to pass through a nearly field free region. An actively shielded coil geometry does this using nested, opposite polarity, quadrupoles where the combined external fields cancel while leaving a net gradient inside. In order to fabricate and test this concept in a timely and cost effective manner we propose to reuse the inner coils from an existing high gradient Nb3Sn LARP quadrupole inside a new structure with a new NbTi active shield coil. The main challenge is to design a compact structure for applying prestress to the Nb3Sn coil that fits the restricted space inside the shield coil. We first construct a 15 cm long mechanical model of this structure with coil strain gauges to verify the design concept before proceeding with the full coil. Mechanical modeling results and our preliminary design concept are reported here.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF014
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WEPMF083	Comparison of Superconducting Septa Topologies and Parameter Space Exploration	2578
	M.G. Atanasov, J.C.C.M. Borburgh, M. Hourican, A. Sanz Ull CERN, Geneva, Switzerland
	The unprecedented energy scale of the FCC poses challenging requirements for its magnetic elements including the septum magnets for injection and extraction. With an ambitious target field of 4 T and an apparent septum thickness of only 25 mm, different superconducting septa topologies have been investigated to explore their limitations. This article will cover the currently feasible topologies, amongst which the truncated cosine-theta, the double truncated cosine-theta, the superconducting shield (SuShi) and the so called stealth dipole. A performance figure of merit will be proposed, taking into account the maximum achievable magnetic field, the septum thickness and the leak field magnitude.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF083
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WEPML009	Superconducting Magnet Performance in LCLS-II Cryomodules	2693
	V.S. Kashikhin, S. Cheban, J. DiMarco, E.R. Harms, A.V. Makarov, T. Strauss, M.A. Tartaglia Fermilab, Batavia, Illinois, USA
	Abstract' New LCLS-II Linear Superconducting Accelerator Cryomodules under construction at Fermilab. Inside each SCRF Cryomodule installed superconducting magnet package to focus and steer an electron beam. The magnet package has the iron dominated configuration with racetrack type quadrupole and dipole conductively cooled coils. For easier installation the magnet could be split in the vertical plane. Initially the magnet was tested in a liquid helium bath, and were performed high precision magnetic field measurements. Several Cryomodules with magnets inside were built and successfully tested at Fermilab test facility. In the paper presented Cryomodule magnet packages test results, discussed the magnet, and current leads conduction cooling performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML009
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WEPML025	Advantages and Challenges of Nb3Sn Superconducting Undulators	2734
	A.V. Zlobin, E.Z. Barzi, D. Turrioni Fermilab, Batavia, Illinois, USA Y. Ivanyushenkov, I. Kesgin ANL, Argonne, Illinois, USA
	Funding: This work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. Superconducting undulators (SCUs) employ superconducting coils, and due to high critical current density in a superconductor, outperform undulators based on permanent magnets in terms of the level of magnetic field. So far, most of the SCUs, including devices built at Advanced Photon Source (APS), use Nb-Ti superconductor. Utilization of Nb3Sn conductor offers a possibility to increase the undulator field even further but requires to overcome certain challenges that are described in this paper. Based on experience of developing Nb3Sn accelerator magnets at Fermi National Accelerator Laboratory, possible solutions are discussed. The achievable field levels for Nb3Sn version of existing APS and the future APS-Upgrade superconducting undulators are also presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML025
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WEPML026	Large-Aperture High-Field Nb3Sn Dipole Magnets	2738
	A.V. Zlobin, V.V. Kashikhin, I. Novitski Fermilab, Batavia, Illinois, USA
	Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy Large-aperture high-field dipole magnets based on Nb3Sn superconductor are necessary for various accelerator systems of future hadron and muon colliders. In hadron colliders, they are used needed for beam separation before and after interaction points. In a muon collider, they are considered for both the arc and the interaction regions to provide room for internal absorbers protecting magnets from the muon decay products. These magnets can also be used in test facilities to produce a background magnetic field for testing conductor samples or insert coils. High level of magnetic field and large aperture size lead to large Lorentz forces and mechanical strains and stresses which can damage brittle Nb3Sn coils. This paper describes conceptual designs of 120-mm aperture dipoles with magnetic fields up to 15 T based on cos-theta coils. Stress management technique and magnet parameters are also presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML026
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WEPML027	Conceptual Design of a 17 T Nb3Sn Accelerator Dipole Magnet	2742
	A.V. Zlobin, J.R. Carmichael, V.V. Kashikhin, I. Novitski Fermilab, Batavia, Illinois, USA
	Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy Nb3Sn dipole magnets with a nominal field of 16 T and sufficient operation margins are being considered for the LHC energy upgrade or a future Very High Energy Hadron Collider. Magnet design studies are being performed in the framework of the US Magnet Development Program to explore the limits of the Nb3Sn accelerator magnet technology and feasibility of such magnets, as well as to optimize the magnet design, performance parameters and cost. This paper describes the conceptual design of a 17 T dipole magnet with 60 mm aperture and 4-layer cos-theta coil being developed at Fermilab. The results of magnetic and mechanical analyses, including the non-linear effects in magnetic field and the possible stress management techniques, are also presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML027
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WEPML030	First Tests of the Main Quadrupole and Corrector Magnets for the SIS100 Synchrotron of FAIR	2751
	E.S. Fischer, A. Bleile, V.I. Datskov, V.M. Marusov, J.P. Meier, C. Omet, P.J. Spiller, K. Sugita GSI, Darmstadt, Germany P.G. Akishin, V.V. Borisov, H.G. Khodzhibagiyan, S.A. Kostromin, D.N. Nikiforov, M.M. Shandov, A.V. Shemchuk JINR, Dubna, Moscow Region, Russia
	The heavy ion synchrotron SIS100 is the main accelerator of the FAIR complex (Facility for Antiproton and Ion Research) in Darmstadt, Germany. Currently the construction site and facility are advancing fast. The series production of the main dipoles was already started in 2017. In parallel, the first two quadrupoles, a chromaticity sextupole and a steerer were built and tested in cooperation between GSI and JINR at the cryogenic test facility in Dubna. We present the operation performance of these two first of series quadrupole units (consisting both of a corrector magnet mechanically and hydraulically combined with a quadrupole). Besides the thermal stability of the fast ramped superconducting magnets special attention is directed to their magnetic field properties. The obtained results provide the basis for starting the series production of all SIS100 quadrupole and corrector magnets in 2018.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML030
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WEPML035	Superconducting Dipoles for SIS100	2768
	C. Roux, P. Aguar Bartolome, A. Bleile, E.S. Fischer, G. Golluccio, F. Kaether, J. Ketter, J.P. Meier, A. Mierau, C. Omet, P.J. Spiller, K. Sugita, P.B. Szwangruber, A. Warth, H.G. Weiss GSI, Darmstadt, Germany
	The international facility for antiproton and ion research (FAIR) is currently being developed in Darmstadt, Germany, for fundamental research in various fields of modern physics. Its main accelerator, the SIS100 heavy ion synchrotron, utilizes fast-cycling superconducting magnets operated at cryogenic temperatures. An intense measurement program of first of series (FoS) module revealed excellent behaviour with respect to, e.g., quench performance and AC losses. With an optimized fabrication technique, the geometrical accuracy was improved to be sufficient to provide a highly homogeneous field. Consequently, the series production of 110 dipoles was released. First significant results on the reproducibility and the variation of physical properties along the series production gained at the test facility of GSI are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML035
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WEPML036	Truncated Cosine Theta Magnet and the Applications	2772
	K. Sugita, E.S. Fischer, P.J. Spiller GSI, Darmstadt, Germany
	Typically septum magnets are designed with a combination of a C-shape iron yoke and a copper cable. Due to leakage of a magnetic field at a circulating beam passing through a saturated iron area, high field septum magnets with this concept is not feasible. Thus, this conventional design approach is limited magnetic field strength below 2 Tesla. For high energy machines, like SIS300 at FAIR or FCC at CERN, high field septum magnets are required to shorten the injection and extraction branch lines. Recently superconducting magnets, which enable to reduce the size of a building, are being introduced to medical accelerators. However, even if bending magnets are replaced by high field magnets, long straight sections, which is partly composed by a conventional septum magnet, remain. By introducing high field septum magnets, more compact accelerator can be designed. To get over the limitation of 2 Tesla, a novel concept of a septum magnet generating high magnetic field has been developed and design studies are ongoing. By using superconducting technology, a septum magnet can be designed to generate more than 2 Tesla. We present the concept and various application for the accelerators.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML036
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WEPML064	Design of the Trim Coil for the Superconducting Cyclotron Extraction	2840
	L.G. Zhang, K. Fan, S. Hu, Z.Y. Mei, Z.J. Zeng HUST, Wuhan, People's Republic of China
	A proton therapy system is being developed at Huazhong university of science and technology (HUST). A 250 MeV superconducting cyclotron with an average magnetic filed of 3.1 T in the extraction region is selected to reduce the machine size, which creates difficulties for beam extraction because of the small turn separation of the beam orbits in the extraction region. To obtain high extraction efficiency, a carefully controlled magnetic perturbation is introduced to excite resonance when beam passes through the νr =1 resonance. The first-order perturbation in the magnetic field is generated by trim coils within confined regions. The profile of the trim coil and the resultant perturbation fields are optimized iteratively with orbit tracking. Simulation shows that sufficient turn separation can be obtained with the proper setting of trim coils.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML064
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WEPML071	Superconducting 16-Pole Wiggler for Beijing Electron-Positron Collider II	2853
	M.X. Li, X.J. Bian, F.S. Chen, W. Chen, X.J. Sun, H. Wang, J.L. Wang, N. Wang, M.F. Xu, X.C. Yang IHEP, Beijing, People's Republic of China
	A superconducting 16-pole 2.6T wiggler with period 170mm of The High-Energy Photon Source and the Test Facility Project (HEPS-TF) designed and fabricating in the Institute of High Energy Physics (IHEP) in China is described. This wiggler will be installed in Beijing Electron-Positron Collider II (BEPCII). The main parameters and structure of the wiggler are presented. Besides, some vertical testing results are involved.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML071
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THPAL013	First Serial Magnetic Measurements of the NICA Collider Twin-Aperture Dipoles	3645
	M.M. Shandov, V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin JINR, Dubna, Russia I.I. Donguzov, M. A. Kashunin, V. A. Mykhailenko, T.A. Parfylo, A.V. Shemchuk, D.A. Zolotykh JINR/VBLHEP, Dubna, Moscow region, Russia
	NICA is a new accelerator complex under construction at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, to study properties of hot and dense baryonic matter. Magnetic system of the NICA collider includes 80 twin-aperture dipole and 86 quadrupole superconducting magnets. The collider twin-aperture magnet is 1.94 m long, 120 mm/70 mm (h/v) aperture with window-frame design similar to the Nuclotron magnet. The measurement of the magnetic field parameters is supported to be conducted for both apertures of each collider magnet. This paper describes magnetic measurements methods and the development of the dedicated system for serial dipole magnets of the NICA collider.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL013
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THPAL014	Serial Magnetic Measurements for the NICA Quadruple Magnets of the NICA Booster Synchrotron	3649
	A.V. Shemchuk JINR/VBLHEP, Dubna, Moscow region, Russia V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin, M.M. Shandov JINR, Dubna, Moscow Region, Russia
	NICA is a new accelerator collider complex under con-struction at JINR, Dubna. More than 250 superconducting magnets are needed for the NICA booster and collider. The NICA Booster magnetic system includes 48 quadrupole superconducting magnets. The rotating coils probe developed for series magnetic measurements of booster quadrupoles doublets, as well as measuring methods are described. Results of magnetic measurements in cryogenic conditions for 12 doublets are presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL014
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THPAL037	Nano-engineering of Nb3Sn Thin Films to Improve Wire Performance and Reduce Cost	3720
	S.A. Kahn, M.A. Cummings Muons, Inc, Illinois, USA E.Z. Barzi Fermilab, Batavia, Illinois, USA
	State-of-the-art Nb3Sn wires have plateaued in the performance of the critical current density Jc. Chemical and geometrical optimization of the wire layout have produced Nb3Sn wires with average Jc(4.2K, 16T) ~ 1,300 A/mm2. A future high energy hadron collider that is being considered to follow the LHC would need larger Jc and be cost effective. The approach to improving the performance of Nb3Sn conductor would be to introduce enhanced flux pinning mechanisms with nano-engineering techniques.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL037
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THPAL104	The Magnetic Field Measurement Systems for a Cryogenic Undulator and a Superconducting Undulator at SSRF	3878
	H.F. Wang SSRF, Shanghai, People's Republic of China M.F. Qian, W. Zhang, Q.G. Zhou SINAP, Shanghai, People's Republic of China
	Two cryogenic permanent magnet undulators (CPMU) have been developed and assembled into storage ring at SSRF，in order to reach larger magnetic field and to produce higher brilliance in the hard X rays domain. Lowering the temperature of permanent magnets increases the magnetic produced field about by 15%. A set of magnetic measurement system and a suitable magnetic field optimization method have been developed. The design of a magnetic measurement bench based on a Hall probe to perform low temperature measurement has been finished. In addition, a 50-period superconducting undulator prototype with 16mm period length is also being developed for more photons with some specific photon characteristic. And a special hall probe system has been built in order to characterize the magnetic field distribution of the SCU prototype.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL104
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Paper

Title

Page

TUZGBE1

Development of a 15 T Model Dipole for a Very High Energy Hadron Collider

A.V. Zlobin
Fermilab, Batavia, Illinois, USA

The U.S. Magnet Development Program (MDP) is developing advanced accelerator magnet technology for future hadron colliders. In this context, a 15 T Nb3Sn dipole is being built and tested at Fermilab. This invited talk presents and discusses magnet design features and results including quench performance and magnetic measurements.

Slides TUZGBE1 [13.535 MB]

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TUZGBE2

Final-focus Superconducting Magnets for SuperKEKB

1215

N. Ohuchi, K.A. Aoki, Y. Arimoto, M.K. Kawai, T. Kawamoto, H. Koiso, Y. Kondo, M. Masuzawa, A. Morita, S. Nakamura, Y. Ohnishi, Y. Ohsawa, T. Oki, H. Sugimoto, K. Tsuchiya, R. Ueki, X. Wang, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan
M. Anerella, J. Escallier, A.K. Jain, A. Marone, B. Parker, P. Wanderer
BNL, Upton, Long Island, New York, USA
J. DiMarco, T.G. Gardner, J.M. Nogiec, M.A. Tartaglia, G. Velev
Fermilab, Batavia, Illinois, USA
T.-H. Kim
Mitsubishi Electric Corp, Advanced Technology R & D Center, Hyogo, Japan

The SuperKEKB collider aims at 40 times higher luminosity than that achieved at KEKB, based on the nano-beam scheme. The vertical beta function at the interaction point will be squeezed to 300μmeter. Final-focus superconducting magnet system which consists of eight main quadrupole magnets, 43 corrector windings, and compensation solenoids is a key component to achieve high luminosity. This invited talk presents the construction and commissioning of the final-focus magnet system.

Slides TUZGBE2 [4.235 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE2

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WEXGBF2

Development and Operational Experience of APS Superconducting Undulators

E. Gluskin
ANL, Argonne, Illinois, USA

Addressing a demand by Advanced Photon Source (APS) users for high-intensity circular polarized photon beams, development has begun at APS on circular polarising undulators. The first such device is currently being built for the APS storage ring. It is based on a superconducting magnet with a conventional double-helical coil structure. This helical superconducting undulator will be completed in 2017. In addition, the concept of a novel SuperConducting Arbitrarily Polarizing Emitter (SCAPE) has been suggested and is now under development. It consists of two pairs, both vertical and horizontal, of superconducting magnets assembled around a beam vacuum chamber. Such a device is capable of generating either planar or circular polarized photons, depending on which pair of magnets is energized. The SCAPE undulators could be attractive for the APS Upgrade and other fourth-generation storage rings with a multi-bend achromat lattice, as well as for FELs where utilization of round beam vacuum chambers becomes possible. This invited talk presents the status of work on the helical SCU, as well as a conceptual design of the SCAPE.

Slides WEXGBF2 [122.418 MB]

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WEPMF014

Fast Track Actively Shielded Nb3Sn IR Quadrupole R&D

2398

B. Parker, M. Anerella, J.P. Cozzolino, R.C. Gupta, R.B. Palmer, J. Schmalzle, H. Witte
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
The Interaction Region (IR) magnets for future Electron Ion Colliders (EIC), such as eRHIC at BNL, JLEIC at JLab and LHeC at CERN, must satisfy strongly opposing requirements. EIC IR superconducting quadrupole coils must provide strong focusing gradients, leading to large peak fields, for the high momentum hadron beam while permitting the nearby electron beam to pass through a nearly field free region. An actively shielded coil geometry does this using nested, opposite polarity, quadrupoles where the combined external fields cancel while leaving a net gradient inside. In order to fabricate and test this concept in a timely and cost effective manner we propose to reuse the inner coils from an existing high gradient Nb3Sn LARP quadrupole inside a new structure with a new NbTi active shield coil. The main challenge is to design a compact structure for applying prestress to the Nb3Sn coil that fits the restricted space inside the shield coil. We first construct a 15 cm long mechanical model of this structure with coil strain gauges to verify the design concept before proceeding with the full coil. Mechanical modeling results and our preliminary design concept are reported here.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF014

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WEPMF083

Comparison of Superconducting Septa Topologies and Parameter Space Exploration

2578

M.G. Atanasov, J.C.C.M. Borburgh, M. Hourican, A. Sanz Ull
CERN, Geneva, Switzerland

The unprecedented energy scale of the FCC poses challenging requirements for its magnetic elements including the septum magnets for injection and extraction. With an ambitious target field of 4 T and an apparent septum thickness of only 25 mm, different superconducting septa topologies have been investigated to explore their limitations. This article will cover the currently feasible topologies, amongst which the truncated cosine-theta, the double truncated cosine-theta, the superconducting shield (SuShi) and the so called stealth dipole. A performance figure of merit will be proposed, taking into account the maximum achievable magnetic field, the septum thickness and the leak field magnitude.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF083

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WEPML009

Superconducting Magnet Performance in LCLS-II Cryomodules

2693

V.S. Kashikhin, S. Cheban, J. DiMarco, E.R. Harms, A.V. Makarov, T. Strauss, M.A. Tartaglia
Fermilab, Batavia, Illinois, USA

Abstract' New LCLS-II Linear Superconducting Accelerator Cryomodules under construction at Fermilab. Inside each SCRF Cryomodule installed superconducting magnet package to focus and steer an electron beam. The magnet package has the iron dominated configuration with racetrack type quadrupole and dipole conductively cooled coils. For easier installation the magnet could be split in the vertical plane. Initially the magnet was tested in a liquid helium bath, and were performed high precision magnetic field measurements. Several Cryomodules with magnets inside were built and successfully tested at Fermilab test facility. In the paper presented Cryomodule magnet packages test results, discussed the magnet, and current leads conduction cooling performance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML009

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WEPML025

Advantages and Challenges of Nb3Sn Superconducting Undulators

2734

A.V. Zlobin, E.Z. Barzi, D. Turrioni
Fermilab, Batavia, Illinois, USA
Y. Ivanyushenkov, I. Kesgin
ANL, Argonne, Illinois, USA

Funding: This work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
Superconducting undulators (SCUs) employ superconducting coils, and due to high critical current density in a superconductor, outperform undulators based on permanent magnets in terms of the level of magnetic field. So far, most of the SCUs, including devices built at Advanced Photon Source (APS), use Nb-Ti superconductor. Utilization of Nb3Sn conductor offers a possibility to increase the undulator field even further but requires to overcome certain challenges that are described in this paper. Based on experience of developing Nb3Sn accelerator magnets at Fermi National Accelerator Laboratory, possible solutions are discussed. The achievable field levels for Nb3Sn version of existing APS and the future APS-Upgrade superconducting undulators are also presented and discussed.

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WEPML026

Large-Aperture High-Field Nb3Sn Dipole Magnets

2738

A.V. Zlobin, V.V. Kashikhin, I. Novitski
Fermilab, Batavia, Illinois, USA

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
Large-aperture high-field dipole magnets based on Nb3Sn superconductor are necessary for various accelerator systems of future hadron and muon colliders. In hadron colliders, they are used needed for beam separation before and after interaction points. In a muon collider, they are considered for both the arc and the interaction regions to provide room for internal absorbers protecting magnets from the muon decay products. These magnets can also be used in test facilities to produce a background magnetic field for testing conductor samples or insert coils. High level of magnetic field and large aperture size lead to large Lorentz forces and mechanical strains and stresses which can damage brittle Nb3Sn coils. This paper describes conceptual designs of 120-mm aperture dipoles with magnetic fields up to 15 T based on cos-theta coils. Stress management technique and magnet parameters are also presented and discussed.

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WEPML027

Conceptual Design of a 17 T Nb3Sn Accelerator Dipole Magnet

2742

A.V. Zlobin, J.R. Carmichael, V.V. Kashikhin, I. Novitski
Fermilab, Batavia, Illinois, USA

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
Nb3Sn dipole magnets with a nominal field of 16 T and sufficient operation margins are being considered for the LHC energy upgrade or a future Very High Energy Hadron Collider. Magnet design studies are being performed in the framework of the US Magnet Development Program to explore the limits of the Nb3Sn accelerator magnet technology and feasibility of such magnets, as well as to optimize the magnet design, performance parameters and cost. This paper describes the conceptual design of a 17 T dipole magnet with 60 mm aperture and 4-layer cos-theta coil being developed at Fermilab. The results of magnetic and mechanical analyses, including the non-linear effects in magnetic field and the possible stress management techniques, are also presented and discussed.

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WEPML030

First Tests of the Main Quadrupole and Corrector Magnets for the SIS100 Synchrotron of FAIR

2751

E.S. Fischer, A. Bleile, V.I. Datskov, V.M. Marusov, J.P. Meier, C. Omet, P.J. Spiller, K. Sugita
GSI, Darmstadt, Germany
P.G. Akishin, V.V. Borisov, H.G. Khodzhibagiyan, S.A. Kostromin, D.N. Nikiforov, M.M. Shandov, A.V. Shemchuk
JINR, Dubna, Moscow Region, Russia

The heavy ion synchrotron SIS100 is the main accelerator of the FAIR complex (Facility for Antiproton and Ion Research) in Darmstadt, Germany. Currently the construction site and facility are advancing fast. The series production of the main dipoles was already started in 2017. In parallel, the first two quadrupoles, a chromaticity sextupole and a steerer were built and tested in cooperation between GSI and JINR at the cryogenic test facility in Dubna. We present the operation performance of these two first of series quadrupole units (consisting both of a corrector magnet mechanically and hydraulically combined with a quadrupole). Besides the thermal stability of the fast ramped superconducting magnets special attention is directed to their magnetic field properties. The obtained results provide the basis for starting the series production of all SIS100 quadrupole and corrector magnets in 2018.

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WEPML035

Superconducting Dipoles for SIS100

2768

C. Roux, P. Aguar Bartolome, A. Bleile, E.S. Fischer, G. Golluccio, F. Kaether, J. Ketter, J.P. Meier, A. Mierau, C. Omet, P.J. Spiller, K. Sugita, P.B. Szwangruber, A. Warth, H.G. Weiss
GSI, Darmstadt, Germany

The international facility for antiproton and ion research (FAIR) is currently being developed in Darmstadt, Germany, for fundamental research in various fields of modern physics. Its main accelerator, the SIS100 heavy ion synchrotron, utilizes fast-cycling superconducting magnets operated at cryogenic temperatures. An intense measurement program of first of series (FoS) module revealed excellent behaviour with respect to, e.g., quench performance and AC losses. With an optimized fabrication technique, the geometrical accuracy was improved to be sufficient to provide a highly homogeneous field. Consequently, the series production of 110 dipoles was released. First significant results on the reproducibility and the variation of physical properties along the series production gained at the test facility of GSI are presented.

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WEPML036

Truncated Cosine Theta Magnet and the Applications

2772

K. Sugita, E.S. Fischer, P.J. Spiller
GSI, Darmstadt, Germany

Typically septum magnets are designed with a combination of a C-shape iron yoke and a copper cable. Due to leakage of a magnetic field at a circulating beam passing through a saturated iron area, high field septum magnets with this concept is not feasible. Thus, this conventional design approach is limited magnetic field strength below 2 Tesla. For high energy machines, like SIS300 at FAIR or FCC at CERN, high field septum magnets are required to shorten the injection and extraction branch lines. Recently superconducting magnets, which enable to reduce the size of a building, are being introduced to medical accelerators. However, even if bending magnets are replaced by high field magnets, long straight sections, which is partly composed by a conventional septum magnet, remain. By introducing high field septum magnets, more compact accelerator can be designed. To get over the limitation of 2 Tesla, a novel concept of a septum magnet generating high magnetic field has been developed and design studies are ongoing. By using superconducting technology, a septum magnet can be designed to generate more than 2 Tesla. We present the concept and various application for the accelerators.

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WEPML064

Design of the Trim Coil for the Superconducting Cyclotron Extraction

2840

L.G. Zhang, K. Fan, S. Hu, Z.Y. Mei, Z.J. Zeng
HUST, Wuhan, People's Republic of China

A proton therapy system is being developed at Huazhong university of science and technology (HUST). A 250 MeV superconducting cyclotron with an average magnetic filed of 3.1 T in the extraction region is selected to reduce the machine size, which creates difficulties for beam extraction because of the small turn separation of the beam orbits in the extraction region. To obtain high extraction efficiency, a carefully controlled magnetic perturbation is introduced to excite resonance when beam passes through the νr =1 resonance. The first-order perturbation in the magnetic field is generated by trim coils within confined regions. The profile of the trim coil and the resultant perturbation fields are optimized iteratively with orbit tracking. Simulation shows that sufficient turn separation can be obtained with the proper setting of trim coils.

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WEPML071

Superconducting 16-Pole Wiggler for Beijing Electron-Positron Collider II

2853

M.X. Li, X.J. Bian, F.S. Chen, W. Chen, X.J. Sun, H. Wang, J.L. Wang, N. Wang, M.F. Xu, X.C. Yang
IHEP, Beijing, People's Republic of China

A superconducting 16-pole 2.6T wiggler with period 170mm of The High-Energy Photon Source and the Test Facility Project (HEPS-TF) designed and fabricating in the Institute of High Energy Physics (IHEP) in China is described. This wiggler will be installed in Beijing Electron-Positron Collider II (BEPCII). The main parameters and structure of the wiggler are presented. Besides, some vertical testing results are involved.

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THPAL013

First Serial Magnetic Measurements of the NICA Collider Twin-Aperture Dipoles

3645

M.M. Shandov, V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin
JINR, Dubna, Russia
I.I. Donguzov, M. A. Kashunin, V. A. Mykhailenko, T.A. Parfylo, A.V. Shemchuk, D.A. Zolotykh
JINR/VBLHEP, Dubna, Moscow region, Russia

NICA is a new accelerator complex under construction at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, to study properties of hot and dense baryonic matter. Magnetic system of the NICA collider includes 80 twin-aperture dipole and 86 quadrupole superconducting magnets. The collider twin-aperture magnet is 1.94 m long, 120 mm/70 mm (h/v) aperture with window-frame design similar to the Nuclotron magnet. The measurement of the magnetic field parameters is supported to be conducted for both apertures of each collider magnet. This paper describes magnetic measurements methods and the development of the dedicated system for serial dipole magnets of the NICA collider.

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THPAL014

Serial Magnetic Measurements for the NICA Quadruple Magnets of the NICA Booster Synchrotron

3649

A.V. Shemchuk
JINR/VBLHEP, Dubna, Moscow region, Russia
V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin, M.M. Shandov
JINR, Dubna, Moscow Region, Russia

NICA is a new accelerator collider complex under con-struction at JINR, Dubna. More than 250 superconducting magnets are needed for the NICA booster and collider. The NICA Booster magnetic system includes 48 quadrupole superconducting magnets. The rotating coils probe developed for series magnetic measurements of booster quadrupoles doublets, as well as measuring methods are described. Results of magnetic measurements in cryogenic conditions for 12 doublets are presented and discussed.

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THPAL037

Nano-engineering of Nb3Sn Thin Films to Improve Wire Performance and Reduce Cost

3720

S.A. Kahn, M.A. Cummings
Muons, Inc, Illinois, USA
E.Z. Barzi
Fermilab, Batavia, Illinois, USA

State-of-the-art Nb3Sn wires have plateaued in the performance of the critical current density Jc. Chemical and geometrical optimization of the wire layout have produced Nb3Sn wires with average Jc(4.2K, 16T) ~ 1,300 A/mm2. A future high energy hadron collider that is being considered to follow the LHC would need larger Jc and be cost effective. The approach to improving the performance of Nb3Sn conductor would be to introduce enhanced flux pinning mechanisms with nano-engineering techniques.

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THPAL104

The Magnetic Field Measurement Systems for a Cryogenic Undulator and a Superconducting Undulator at SSRF

3878

H.F. Wang
SSRF, Shanghai, People's Republic of China
M.F. Qian, W. Zhang, Q.G. Zhou
SINAP, Shanghai, People's Republic of China

Two cryogenic permanent magnet undulators (CPMU) have been developed and assembled into storage ring at SSRF，in order to reach larger magnetic field and to produce higher brilliance in the hard X rays domain. Lowering the temperature of permanent magnets increases the magnetic produced field about by 15%. A set of magnetic measurement system and a suitable magnetic field optimization method have been developed. The design of a magnetic measurement bench based on a Hall probe to perform low temperature measurement has been finished. In addition, a 50-period superconducting undulator prototype with 16mm period length is also being developed for more photons with some specific photon characteristic. And a special hall probe system has been built in order to characterize the magnetic field distribution of the SCU prototype.

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