IPAC2017 - Classification: 07 Accelerator Technology / T10 Superconducting Magnets

Paper	Title	Page
MOYBA1	The Future of Superconducting Technology for Accelerators	19
	A. Yamamoto KEK, Ibaraki, Japan
	Superconducting magnets and RF cavities are widely used in accelerators, and future accelerator projects heavily rely on this technology. There may be several questions on the future of the SC technology, concerning the feasibility of very high field dipoles (~15 T or more), possible technology evolution(s) with new materials, operation at higher temperature, and final sustainability of the technology in terms of helium procurement. The talk will cover a brief history/achievements and some interesting (future) developments, partly or fully answering these question.
	Slides MOYBA1 [25.792 MB]
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WEOCB1	HTS Magnets for Accelerator Applications	2543
	K. Hatanaka, M. Fukuda, S. Hara, K. Kamakura, M. Nakao, Y. Yasuda, T. Yorita RCNP, Osaka, Japan
	We have developed HTS magnets using the first generation wires for 15 years. HTS materials have larger temperature margin than LTS materials. Magnets can be operated around 20 K or higher temperature and can be conduction-cooled by cryocoolers. The cooling structure becomes simpler and the cooling power of a cooler is high. We expect to excite HTS magnets by AC or pulsed currents without quenching. After successful performance tests of prototype magnets, we fabricated two magnets for practical use, an air-core cylindrical magnet and a super-ferric dipole magnet. The former one is used to polarize ultra-cold neutrons and the latter is a switching dipole magnet to deliver accelerated beams to two target stations by time sharing. Their design and operational performance are presented
	Slides WEOCB1 [2.946 MB]
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WEOCB2	Superconducting Magnets at FAIR	2546
	E.S. Fischer, A. Bleile, J. Ceballos Velasco, V.I. Datskov, F. Kaether, J.P. Meier, A. Mierau, H. Müller, C. Roux, P.J. Spiller, K. Sugita GSI, Darmstadt, Germany
	For the FAIR (Facility of Antiproton and Ion Research) accelerators, various technologies of superconducting magnets have been developed. In total, 613 superconducting magnets are required for the FAIR modularized start version. For the heavy ion synchrotron SIS100, which is the central accelerator under construction, fast ramped, iron dominated superconducting magnets of the Nuclotron type will be used. Due to the high beam intensity operation desired for SIS100, highest precision and reproducibility is requested for the iron yoke of these magnets. For the dipole magnets of SIS100 the series production has already been released. In parallel, the Super-FRS will be built for the generation of radioactive beams and for isotope separation. Huge aperture superconducting dipole magnets and multiplet modules are required for the main separator of the Super-FRS. For testing of the various types of sc magnets, three test facilities at GSI, JINR and CERN have been set-up. We give an overview on the modern design aspects for the different magnet types and their first test results and the preparation of the appropriate test facilities.
	Slides WEOCB2 [12.633 MB]
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WEPVA053	New Extraction Line for the Lns Cyclotron	3378
	L. Calabretta, A. Calanna, G. D'Agostino, D. Rifuggiato, A.D. Russo INFN/LNS, Catania, Italy G. D'Agostino Universita Degli Studi Di Catania, Catania, Italy
	The LNS Superconducting Cyclotron will be modified to allow the extraction by stripper of ion beams with power up to 10 kW. By choosing properly the position of the stripper foils and of the corrector magnetic channels, it is possible to convoy the trajectories of the selected representative ion beams across a new extraction channel. It is mandatory to design a new extraction line to transport these beams to the existing beam transport line. The extracted beams have an energy spread of about ±0.4%, so, the new extraction line has to compensate the correlation energy-position of the beam and to produce an achromatic waist of the beam at the common starting point of the existing transport lines. The main changes of the cyclotron will be briefly described and the performance and the features of the new extraction line will be presented too.
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WEPVA081	Topology Optimization for a Superconducting Cyclotron Main Magnet	3446
SUSPSIK109	use link to see paper's listing under its alternate paper code
	L.G. Zhang, K. Fan, S. Hu, L.X.F. Li, Z.Y. Mei, B. Qin, Z.J. Zeng HUST, Wuhan, People's Republic of China W. Chen Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Main magnet is the heaviest component in a superconducting cyclotron, which occupies a large amount of cost. Topology optimization method is implanted to minimize the weight of main magnet while keep the field performance, which will make significant economic benefit. Due to the powerful superconducting coils, the main magnet is driven into saturation, and the nonlinear effect of the material must be considered. If the ordinary standard density method is used for the main magnet structure optimization, the nonlinear B-H relation have to be interpolated and the sensitivity analysis is very complicated. In this paper, a proper 2D model is established and the optimization formulation is given using standard density method. Then, the optimized topology of the main magnet for a 250MeV superconducting proton cyclotron is designed.
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WEPVA087	Magnetic Measurements of NICA Booster Dipoles	3458
	V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin, M.M. Omelyanenko, M.M. Shandov JINR, Dubna, Moscow Region, Russia A.V. Shemchuk JINR/VBLHEP, Dubna, Moscow region, Russia
	NICA is a new accelerator collider complex under construction at the Joint Institute for Nuclear Research in Dubna. NICA booster magnetic system consists of 40 dipole and 48 quadrupole superconducting magnets. Measurement of magnetic field parameters is assumed for each booster magnets. At the moment 20 series dipole magnets are assembled and have passed all tests. Booster dipole magnets are 2.14 m-long, 128 /65 mm (h/v) aperture magnets with design similar to Nuclotron dipole magnet but with curved (14.1 m radius) yoke. They will produce fields up to 1.8 T. The magnetic field parameters will be measured at warm (300 K) and cold (4.5 K) conditions. This paper describes magnetic measurements methods and developing of magnetic measurements system. The obtained results of magnetic measurements of 20 magnets are summarized here.
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WEPVA088	Testing of SC-Magnets of NICA booster synchrotron	3461
	S.A. Kostromin, V.V. Borisov, A.M. Donyagin, A.R. Galimov, O. Golubitsky, H.G. Khodzhibagiyan, B.Yu. Kondratiev, S.A. Korovkin, A.V. Kudashkin, G.L. Kuznetsov, D. Nikiforov, A.V. Shemchuk, A.Y. Starikov, A. Tikhomirov JINR, Dubna, Moscow Region, Russia T.E. Serochkina JINR/VBLHEP, Dubna, Moscow region, Russia
	Serial tests of sc-magnets of NICA Booster started at the dedicated facility of LHEP JINR. Magnets' assembly and testing workflow are presented. Main steps of the magnet preparation to the cryogenics tests are described. First results of serial tests are presented and discussed.
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WEPVA089	Magnetic Measurement System for the NICA Quadrupole Magnets	3464
	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. Omelyanenko, M.M. Shandov JINR, Dubna, Moscow Region, Russia
	NICA is a new accelerator collider Nuclear Research (JINR) in Dubna. More than 250 superconducting magnets need for the NICA booster and collider. These magnets will be assembled and tested at the new test facility in the Laboratory of High Energy Physics JINR. A method of measuring the quality of the magnetic field in the aperture of the quadrupole magnet for the booster synchrotron is described. Commissioning of equipment for magnetic measurements in the aperture of the doublet of quadrupole lenses is described.
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WEPVA111	Change of Critical Current Density in Nb-Ti and Nb3Sn Strands After Millisecond Heating	3528
SUSPSIK110	use link to see paper's listing under its alternate paper code
	V. Raginel, K. Kulesz, M. Mentink, R. Schmidt, A.P. Verweij, D. Wollmann CERN, Geneva, Switzerland D. Kleiven NTNU, Trondheim, Norway
	The damage mechanisms and limits of superconducting magnet components due to direct beam impact are not well understood. The energy deposition from beam losses can cause significant temperature rise and mechanical stress in the magnet coils, which can lead to a degradation of the insulation strength and critical current of the superconductor. An improved understanding of these mechanisms is not only important for the LHC in view of the planned increase in beam brightness, but also for other high energy accelerators using superconducting magnets. An experimental road map has been defined to study these damage mechanisms. Experiments have been performed with Nb-Ti and Nb3Sn strands and cable stacks at room temperature. This contribution focuses on the experimental study on the effect of millisecond heating on superconducting strands.
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WEPVA112	Characterisation of the Mechanical Behaviour of Superconducting Cables Used in High Field Magnets From Room Temperature Down to 77K	3532
	O. Sacristan De Frutos, M. Daly, P. Ferracin, C. Fichera, M. Guinchard, T. Mikkola, F. Savary, G. Vallone CERN, Geneva, Switzerland
	A comprehensive knowledge of the mechanical properties of the superconducting cable used in high-field magnets is of paramount importance to study and model the behaviour of the magnet coil from assembly to the operational conditions at cryogenic temperature. The mechanical characterisation of such kind of materials presents practical challenges associated with the heterogeneity of the materials, the geometry, size and quality of the samples that can be produced out of actual cables. These constraints impose the undertaking of such measurements from a nonstandard approach, and hence the development of tailor-made tooling. An extensive characterisation campaign for the determination of the mechanical properties of the superconducting cable at room and cryogenic temperature was launched at CERN in order to determine the most relevant mechanical properties of the superconducting cables used in the MQXF and 11T magnets. This paper describes the design of the tooling developed for this specific application as well as the experimental set-up used for the tests, and discusses the outcomes of the matrix of tests performed.
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WEPVA127	Design of a 3.5 T Superconducting Multipole Wiggler	3564
	J.C. Jan, C.-H. Chang, H.-H. Chen, S.D. Chen, T.Y. Chung, C.-S. Hwang, F.-Y. Lin, G.-H. Luo NSRRC, Hsinchu, Taiwan
	A 3.5 T superconducting multipole wiggler (SMPW) has been designed through the collaboration of National Synchrotron Radiation Research Center (NSRRC) and Synchrotron Light Research Institute (SLRI). The SMPW will support the hard X-ray source for the X-ray absorption spectroscopy (XAS) beamline in SLRI. The design concept of the SMPW follows from, and improves on, the operating experience of the superconducting magnet in NSRRC. An improvement of the operation and compatible with the cooling capacity of the cryogenic system, is the design goal. A quick and easy recovery of the magnet from a quench event is also required. The design of the magnet circuit and the mechanical of the SMPW are also discussed herein.
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WEPVA140	Design Studies and Optimization of High-Field Nb₃Sn Dipole Magnets for a Future Very High Energy pp Collider	3597
	V.V. Kashikhin, I. Novitski, A.V. Zlobin 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 High filed accelerator magnets with operating fields of 15-16 T based on the Nb3Sn superconductor are being considered for the LHC energy upgrade or a future Very High Energy pp Collider. Magnet design studies are being conducted in the U.S., Europe and Asia to explore the limits of the Nb3Sn accelerator magnet technology while optimizing the magnet design and performance parame-ters, and reducing magnet cost. The first results of these studies performed at Fermilab in the framework of the US-MDP are reported in this paper.
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WEPVA142	Active Compensation Coils in the Fermilab g-2 Experiment	3602
	K.E. Badgley Texas A&M University, College Station, USA B. Kiburg Fermilab, Batavia, Illinois, USA M.W. Smith University of Washington, CENPA, Seattle, USA
	The recently commissioned Fermilab muon g-2 experiment is aiming to determine the anomalous magnetic moment of the muon to 140 ppb. To achieve this level of precision, the magnetic field seen by the muon must be know at fraction of a ppm level, which puts limits on the required magnetic field uniformity. In addition to the mechanical adjustments made to magnet pole tips, a set of 200 trim coils were added to the ring. These coils form concentric rings with 100 on the top pole and 100 on the bottom. Measurements of the remaining integrated filed errors were made using NMR probes. The use of these trim coils to reduce the remaining higher order field errors will be discussed.
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WEPVA145	Analysis of Mean Free Path and Field Dependent Surface Resistance	3609
	J.T. Maniscalco, F. Furuta, D.L. Hall, P.N. Koufalis, M. Liepe Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: NSF-PHY 1416318 Work from Cornell in 2016 built on recent theoretical research in the field of SRF to link the electron mean free path to the field-dependent BCS surface resistance. This research relates the magnitude of the ‘‘anti-Q-slope'', the puzzling reduction of surface resistance with increasing RF field intensity observed in certain cavities, to the doping level of nitrogen-doped niobium, quantified by the mean free path: shorter mean free paths correspond directly with stronger anti-Q-slopes. The theoretical connection comes through the overheating of the quasiparticles, which more effectively transfer their energy to the lattice at short mean free paths. In this report, we present an update of this analysis, investigating recent test results of low-temperature-doped single-cell and nine-cell cavities. We also study the theoretical implications for cavities at frequencies higher and lower than the often-studied 1.3~GHz.
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WEPVA147	Iron-Free Detector System for the Linear Collider with Multiple Return Solenoids	3615
	A.A. Mikhailichenko Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	We investigate the Iron-free magnetic system for implementation in a detector for future Linear Collider. One peculiarity is in usage of many small-diameter solenoids for the flux return. Machine-detector interface is discussed also.
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WEPVA151	The eRHIC Interaction Region Magnets	3624
	B. Parker, R.B. Palmer, 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. Designing eRHIC Interaction Region (IR) magnets faces special Machine Detector Interface challenges. Based upon HERA-II experience, a fundamental consideration is to avoid excessive background due to synchrotron radiation striking masks and septa in the vicinity of the experiment. Circumventing such radiation is problematic because the colliding beams have quite different rigidities; we must shield the e-beam from hadron IR magnet multi-tesla coil fields. On the outgoing-hadron, i.e. forward IR side, this difficulty is compounded by needing large hadron beam apertures to enable downstream separation and experimental detection of a mix of scattered and produced forward going charged particles and (in the electron-ion case) a wide-spread cone of neutrons. Here we present superconducting magnet designs with combinations of active and passive shielding and Sweet Spot coils to meet these requirements along with the design of a superferric spectrometer dipole, with an integrated cancel coil, that extends the forward experimental acceptance.
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Paper

Title

Page

The Future of Superconducting Technology for Accelerators

19

A. Yamamoto
KEK, Ibaraki, Japan

Superconducting magnets and RF cavities are widely used in accelerators, and future accelerator projects heavily rely on this technology. There may be several questions on the future of the SC technology, concerning the feasibility of very high field dipoles (~15 T or more), possible technology evolution(s) with new materials, operation at higher temperature, and final sustainability of the technology in terms of helium procurement. The talk will cover a brief history/achievements and some interesting (future) developments, partly or fully answering these question.

Slides MOYBA1 [25.792 MB]

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WEOCB1

HTS Magnets for Accelerator Applications

2543

K. Hatanaka, M. Fukuda, S. Hara, K. Kamakura, M. Nakao, Y. Yasuda, T. Yorita
RCNP, Osaka, Japan

We have developed HTS magnets using the first generation wires for 15 years. HTS materials have larger temperature margin than LTS materials. Magnets can be operated around 20 K or higher temperature and can be conduction-cooled by cryocoolers. The cooling structure becomes simpler and the cooling power of a cooler is high. We expect to excite HTS magnets by AC or pulsed currents without quenching. After successful performance tests of prototype magnets, we fabricated two magnets for practical use, an air-core cylindrical magnet and a super-ferric dipole magnet. The former one is used to polarize ultra-cold neutrons and the latter is a switching dipole magnet to deliver accelerated beams to two target stations by time sharing. Their design and operational performance are presented

Slides WEOCB1 [2.946 MB]

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WEOCB2

Superconducting Magnets at FAIR

2546

E.S. Fischer, A. Bleile, J. Ceballos Velasco, V.I. Datskov, F. Kaether, J.P. Meier, A. Mierau, H. Müller, C. Roux, P.J. Spiller, K. Sugita
GSI, Darmstadt, Germany

For the FAIR (Facility of Antiproton and Ion Research) accelerators, various technologies of superconducting magnets have been developed. In total, 613 superconducting magnets are required for the FAIR modularized start version. For the heavy ion synchrotron SIS100, which is the central accelerator under construction, fast ramped, iron dominated superconducting magnets of the Nuclotron type will be used. Due to the high beam intensity operation desired for SIS100, highest precision and reproducibility is requested for the iron yoke of these magnets. For the dipole magnets of SIS100 the series production has already been released. In parallel, the Super-FRS will be built for the generation of radioactive beams and for isotope separation. Huge aperture superconducting dipole magnets and multiplet modules are required for the main separator of the Super-FRS. For testing of the various types of sc magnets, three test facilities at GSI, JINR and CERN have been set-up. We give an overview on the modern design aspects for the different magnet types and their first test results and the preparation of the appropriate test facilities.

Slides WEOCB2 [12.633 MB]

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WEPVA053

New Extraction Line for the Lns Cyclotron

3378

L. Calabretta, A. Calanna, G. D'Agostino, D. Rifuggiato, A.D. Russo
INFN/LNS, Catania, Italy
G. D'Agostino
Universita Degli Studi Di Catania, Catania, Italy

The LNS Superconducting Cyclotron will be modified to allow the extraction by stripper of ion beams with power up to 10 kW. By choosing properly the position of the stripper foils and of the corrector magnetic channels, it is possible to convoy the trajectories of the selected representative ion beams across a new extraction channel. It is mandatory to design a new extraction line to transport these beams to the existing beam transport line. The extracted beams have an energy spread of about ±0.4%, so, the new extraction line has to compensate the correlation energy-position of the beam and to produce an achromatic waist of the beam at the common starting point of the existing transport lines. The main changes of the cyclotron will be briefly described and the performance and the features of the new extraction line will be presented too.

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WEPVA081

Topology Optimization for a Superconducting Cyclotron Main Magnet

3446

SUSPSIK109

use link to see paper's listing under its alternate paper code

L.G. Zhang, K. Fan, S. Hu, L.X.F. Li, Z.Y. Mei, B. Qin, Z.J. Zeng
HUST, Wuhan, People's Republic of China
W. Chen
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Main magnet is the heaviest component in a superconducting cyclotron, which occupies a large amount of cost. Topology optimization method is implanted to minimize the weight of main magnet while keep the field performance, which will make significant economic benefit. Due to the powerful superconducting coils, the main magnet is driven into saturation, and the nonlinear effect of the material must be considered. If the ordinary standard density method is used for the main magnet structure optimization, the nonlinear B-H relation have to be interpolated and the sensitivity analysis is very complicated. In this paper, a proper 2D model is established and the optimization formulation is given using standard density method. Then, the optimized topology of the main magnet for a 250MeV superconducting proton cyclotron is designed.

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WEPVA087

Magnetic Measurements of NICA Booster Dipoles

3458

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

NICA is a new accelerator collider complex under construction at the Joint Institute for Nuclear Research in Dubna. NICA booster magnetic system consists of 40 dipole and 48 quadrupole superconducting magnets. Measurement of magnetic field parameters is assumed for each booster magnets. At the moment 20 series dipole magnets are assembled and have passed all tests. Booster dipole magnets are 2.14 m-long, 128 /65 mm (h/v) aperture magnets with design similar to Nuclotron dipole magnet but with curved (14.1 m radius) yoke. They will produce fields up to 1.8 T. The magnetic field parameters will be measured at warm (300 K) and cold (4.5 K) conditions. This paper describes magnetic measurements methods and developing of magnetic measurements system. The obtained results of magnetic measurements of 20 magnets are summarized here.

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WEPVA088

Testing of SC-Magnets of NICA booster synchrotron

3461

S.A. Kostromin, V.V. Borisov, A.M. Donyagin, A.R. Galimov, O. Golubitsky, H.G. Khodzhibagiyan, B.Yu. Kondratiev, S.A. Korovkin, A.V. Kudashkin, G.L. Kuznetsov, D. Nikiforov, A.V. Shemchuk, A.Y. Starikov, A. Tikhomirov
JINR, Dubna, Moscow Region, Russia
T.E. Serochkina
JINR/VBLHEP, Dubna, Moscow region, Russia

Serial tests of sc-magnets of NICA Booster started at the dedicated facility of LHEP JINR. Magnets' assembly and testing workflow are presented. Main steps of the magnet preparation to the cryogenics tests are described. First results of serial tests are presented and discussed.

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WEPVA089

Magnetic Measurement System for the NICA Quadrupole Magnets

3464

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. Omelyanenko, M.M. Shandov
JINR, Dubna, Moscow Region, Russia

NICA is a new accelerator collider Nuclear Research (JINR) in Dubna. More than 250 superconducting magnets need for the NICA booster and collider. These magnets will be assembled and tested at the new test facility in the Laboratory of High Energy Physics JINR. A method of measuring the quality of the magnetic field in the aperture of the quadrupole magnet for the booster synchrotron is described. Commissioning of equipment for magnetic measurements in the aperture of the doublet of quadrupole lenses is described.

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WEPVA111

Change of Critical Current Density in Nb-Ti and Nb3Sn Strands After Millisecond Heating

3528

SUSPSIK110

use link to see paper's listing under its alternate paper code

V. Raginel, K. Kulesz, M. Mentink, R. Schmidt, A.P. Verweij, D. Wollmann
CERN, Geneva, Switzerland
D. Kleiven
NTNU, Trondheim, Norway

The damage mechanisms and limits of superconducting magnet components due to direct beam impact are not well understood. The energy deposition from beam losses can cause significant temperature rise and mechanical stress in the magnet coils, which can lead to a degradation of the insulation strength and critical current of the superconductor. An improved understanding of these mechanisms is not only important for the LHC in view of the planned increase in beam brightness, but also for other high energy accelerators using superconducting magnets. An experimental road map has been defined to study these damage mechanisms. Experiments have been performed with Nb-Ti and Nb3Sn strands and cable stacks at room temperature. This contribution focuses on the experimental study on the effect of millisecond heating on superconducting strands.

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WEPVA112

Characterisation of the Mechanical Behaviour of Superconducting Cables Used in High Field Magnets From Room Temperature Down to 77K

3532

O. Sacristan De Frutos, M. Daly, P. Ferracin, C. Fichera, M. Guinchard, T. Mikkola, F. Savary, G. Vallone
CERN, Geneva, Switzerland

A comprehensive knowledge of the mechanical properties of the superconducting cable used in high-field magnets is of paramount importance to study and model the behaviour of the magnet coil from assembly to the operational conditions at cryogenic temperature. The mechanical characterisation of such kind of materials presents practical challenges associated with the heterogeneity of the materials, the geometry, size and quality of the samples that can be produced out of actual cables. These constraints impose the undertaking of such measurements from a nonstandard approach, and hence the development of tailor-made tooling. An extensive characterisation campaign for the determination of the mechanical properties of the superconducting cable at room and cryogenic temperature was launched at CERN in order to determine the most relevant mechanical properties of the superconducting cables used in the MQXF and 11T magnets. This paper describes the design of the tooling developed for this specific application as well as the experimental set-up used for the tests, and discusses the outcomes of the matrix of tests performed.

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WEPVA127

Design of a 3.5 T Superconducting Multipole Wiggler

3564

J.C. Jan, C.-H. Chang, H.-H. Chen, S.D. Chen, T.Y. Chung, C.-S. Hwang, F.-Y. Lin, G.-H. Luo
NSRRC, Hsinchu, Taiwan

A 3.5 T superconducting multipole wiggler (SMPW) has been designed through the collaboration of National Synchrotron Radiation Research Center (NSRRC) and Synchrotron Light Research Institute (SLRI). The SMPW will support the hard X-ray source for the X-ray absorption spectroscopy (XAS) beamline in SLRI. The design concept of the SMPW follows from, and improves on, the operating experience of the superconducting magnet in NSRRC. An improvement of the operation and compatible with the cooling capacity of the cryogenic system, is the design goal. A quick and easy recovery of the magnet from a quench event is also required. The design of the magnet circuit and the mechanical of the SMPW are also discussed herein.

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WEPVA140

Design Studies and Optimization of High-Field Nb₃Sn Dipole Magnets for a Future Very High Energy pp Collider

3597

V.V. Kashikhin, I. Novitski, A.V. Zlobin
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
High filed accelerator magnets with operating fields of 15-16 T based on the Nb3Sn superconductor are being considered for the LHC energy upgrade or a future Very High Energy pp Collider. Magnet design studies are being conducted in the U.S., Europe and Asia to explore the limits of the Nb3Sn accelerator magnet technology while optimizing the magnet design and performance parame-ters, and reducing magnet cost. The first results of these studies performed at Fermilab in the framework of the US-MDP are reported in this paper.

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WEPVA142

Active Compensation Coils in the Fermilab g-2 Experiment

3602

K.E. Badgley
Texas A&M University, College Station, USA
B. Kiburg
Fermilab, Batavia, Illinois, USA
M.W. Smith
University of Washington, CENPA, Seattle, USA

The recently commissioned Fermilab muon g-2 experiment is aiming to determine the anomalous magnetic moment of the muon to 140 ppb. To achieve this level of precision, the magnetic field seen by the muon must be know at fraction of a ppm level, which puts limits on the required magnetic field uniformity. In addition to the mechanical adjustments made to magnet pole tips, a set of 200 trim coils were added to the ring. These coils form concentric rings with 100 on the top pole and 100 on the bottom. Measurements of the remaining integrated filed errors were made using NMR probes. The use of these trim coils to reduce the remaining higher order field errors will be discussed.

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WEPVA145

Analysis of Mean Free Path and Field Dependent Surface Resistance

3609

J.T. Maniscalco, F. Furuta, D.L. Hall, P.N. Koufalis, M. Liepe
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: NSF-PHY 1416318
Work from Cornell in 2016 built on recent theoretical research in the field of SRF to link the electron mean free path to the field-dependent BCS surface resistance. This research relates the magnitude of the ‘‘anti-Q-slope'', the puzzling reduction of surface resistance with increasing RF field intensity observed in certain cavities, to the doping level of nitrogen-doped niobium, quantified by the mean free path: shorter mean free paths correspond directly with stronger anti-Q-slopes. The theoretical connection comes through the overheating of the quasiparticles, which more effectively transfer their energy to the lattice at short mean free paths. In this report, we present an update of this analysis, investigating recent test results of low-temperature-doped single-cell and nine-cell cavities. We also study the theoretical implications for cavities at frequencies higher and lower than the often-studied 1.3~GHz.

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WEPVA147

Iron-Free Detector System for the Linear Collider with Multiple Return Solenoids

3615

A.A. Mikhailichenko
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

We investigate the Iron-free magnetic system for implementation in a detector for future Linear Collider. One peculiarity is in usage of many small-diameter solenoids for the flux return. Machine-detector interface is discussed also.

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WEPVA151

The eRHIC Interaction Region Magnets

3624

B. Parker, R.B. Palmer, 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.
Designing eRHIC Interaction Region (IR) magnets faces special Machine Detector Interface challenges. Based upon HERA-II experience, a fundamental consideration is to avoid excessive background due to synchrotron radiation striking masks and septa in the vicinity of the experiment. Circumventing such radiation is problematic because the colliding beams have quite different rigidities; we must shield the e-beam from hadron IR magnet multi-tesla coil fields. On the outgoing-hadron, i.e. forward IR side, this difficulty is compounded by needing large hadron beam apertures to enable downstream separation and experimental detection of a mix of scattered and produced forward going charged particles and (in the electron-ion case) a wide-spread cone of neutrons. Here we present superconducting magnet designs with combinations of active and passive shielding and Sweet Spot coils to meet these requirements along with the design of a superferric spectrometer dipole, with an integrated cancel coil, that extends the forward experimental acceptance.

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