IPAC2019 - Classification: MC7: Accelerator Technology / T10 Superconducting Magnets

Paper	Title	Page
WEXPLS1	High Performance ECR Sources for Next-Generation Nuclear Science Facilities	2224
	D. Leitner LBNL, Berkeley, California, USA
	Modern heavy-ion accelerators require intense heavy-ion beams with high charge state. Electron Cyclotron Resonance (ECR) sources are the primary tool for generating such beams. Advances in magnet technology and an improved understanding of the ECR ion source plasma physics have led to significant improvements in ECR source performance over the last several decades. The current state of the art is represented by third-generation sources operating at frequencies around 28 GHz and peak coil fields of about 7 T using NbTi conductor. Fourth-generation ECR ion sources with an operating frequency above 40 GHz have the potential to quadruple the source output beam current. These sources will need to incorporate advanced conductor technologies and/or novel coil configurations in order to exceed the limitations of the present structures. This talk will present worldwide efforts currently underway to develop high-performance ECR sources using new design approaches in support of next-generation nuclear physics facilities.
	Slides WEXPLS1 [8.012 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEXPLS1
About •	paper received ※ 16 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS001	Development of Cryogenic Suspension in the ANU 8t Superconducting Solenoid With Iron Yoke	4103
	S.T. Battisson, N.R. Lobanov, D. Tsifakis, T.B. Tunningley Research School of Physics and Engineering, Australian National University, Canberra, Australian Capitol Territory, Australia J.F. Smith University of Surrey, Department of Physics, Guildford, United Kingdom
	Funding: The Australian Federal Government Superscience/EIF funding under the NCRIS mechanism. An 8 Tesla superconducting solenoid was commissioned at The Australian National University to make precision measurements of fusion cross-sections. Forces between the solenoid and the iron yoke that houses it must always be maintained within safe limits and precision location of the solenoid coil is necessary to achieve this. Thermal contraction of components can impact the locating structure of the solenoid coil, leading to unsafe forces. Improvements to this structure allowed successful completion of the first fusion measurements with the 8T solenoidal separator, and demonstrated that it is now ready for a program of fusion measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS001
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS010	Start of the Series Production for the Cryogenic Magnet Corrector Modules of FAIR	4124
	E.S. Fischer, A. Bleile, V.I. Datskov, V. Marusov, J.P. Meier, P.J. Spiller GSI, Darmstadt, Germany
	The fast cycling superconducting synchrotron SIS100 has to deliver high intensity beams for the FAIR project at GSI, Darmstadt. The main dipoles will ramp with 4 T/s up to a maximum magnetic field of 1.9 T where the field gradient of the main quadrupole will reach 27.77 T/m. The integral magnetic field length of the horizontal/vertical steerer and of the chromaticity sextupole will provide 0.403/0.41 m and 0.383 m respectively. We present the status of the first magnets test results as well as the overall procedure of production and testing of the complete series of the cryomagnetic corrector modules.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS010
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS011	Design, Production, and Testing of Superconducting Magnets for the Super-FRS	4128
	H. Müller, E.J. Cho, G. Golluccio, C. Roux, H. Simon, K. Sugita, M. Winkler GSI, Darmstadt, Germany H. Allain, M. Daly, P. Grafin, A. Madur, J.-E. Munoz-Garcia, L. Quettier, H. Reymond CEA-IRFU, Gif-sur-Yvette, France A. Borceto, G. Drago, G. Valesi, D. Ventura ASG, Genova, Italy J. Lucas Elytt Energy, Madrid, Spain L.X. Van Den Boogaard CERN, Geneva, Switzerland
	The Super FRS is a two-stage in flight separator to be built next to the site of GSI, Darmstadt, Germany as part of FAIR (Facility for Anti-proton and Ion Research). Its purpose is to create and separate rare isotope beams and to enable the mass measurement also for very short lived nuclei. Due to its three branches a wide variety of experiments can be carried out in frame of the NUSTAR collaboration. Due to the large acceptance needed, the magnets of the Super-FRS have to have a large aperture and therefore only a superconducting solution is feasible. A superferric design with superconducting coils was chosen in which the magnetic field is shaped by an iron yoke. For the dipoles this iron yoke is at warm and only the coils are incorporated in a cryostat. The multiplets, assemblies of quadrupoles and higher order multipole magnets, are completely immersed in a liquid Helium bath. With the exception of special branching dipoles all superconducting magnets of Super-FRS have been contracted and are being built by Elytt in Spain (dipoles) and ASG in Italy (multiplets). The cold test of all magnets will take place in a dedicated test facility at CERN. This contribution will present the status of manufacturing of dipoles and multiplets, and also gives a short overview on the test facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS011
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS015	Design and Manufacturing of the First Multiplet for the Super-FRS at FAIR	4138
	E.J. Cho, H. Müller, C. Roux, K. Sugita, M. Winkler GSI, Darmstadt, Germany A. Borceto, G. Drago, G. Valesi, D. Ventura ASG, Genova, Italy
	The Super-FRS (Superconducting FRagment Separator) at FAIR is a two-stage in flight separator, which aims to produce rare isotopes of all elements up to Uranium and separate them spatially within a few hundred nanoseconds so that a study of very short lived nuclei can be performed efficiently. In total, it is required to construct 24 dipoles and 170 multipole magnets (quadrupole, sextupole, octupole and steering dipole). Due to the limit of space, the multipole magnets will be arranged as a group (2 ~ 9 magnets) in a common cryostat and they are called as a multiplet. The design challenge of the multiplet lies in a strong iron saturation of the quadrupole leading to disturb the field quality and high design pressure of the He vessel (20 bars). The first multiplet for the Super-FRS is constructed. The magnet column consisting of one quadrupole and one sextupole is cooled in a He vessel filled with up-to 800 liters of liquid He. The both magnets are superferric type and have a large warm bore radius of 190 mm. This paper presents the design overview and the manufacturing status of the first multiplet.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS015
About •	paper received ※ 12 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS030	HEPS-TF Superconducting Wiggler Control System	4174
	J.C. Wang, C.P. Chu, Y. Gao, Q. Le, J. Liu, R. Ye, M.C. Zhan IHEP, Beijing, People’s Republic of China
	Funding: HEPS-TF Superconducting Wiggler (SCW) is an important development direction of insertion devices for modern light sources. It is also the key technology of High Energy Photon Source Test Facility (HEPS-TF) insertion device system research. SCW control system involves power supply, cryogenics，vacuum and other devices, control. Serial port server was built for the SCW control system, with EPICS DB to make the PID algorithm for heater and superconductor cavity pressure, temperature, and with Ziegler-Nichols method to quickly find appropriate PID parameters.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS030
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS036	Quench Detection and Diagnostic Systems for the Superconducting Circuits for the HL-LHC	4183
	R. Denz, D.O. Calcoen, E. De Matteis, V. Froidbise, S. Georgakakis, S. Haas, S. Mundra, T. Podzorny, A.P. Siemko, J. Spasic, J. Steckert CERN, Geneva, Switzerland D. Blasco Serrano CIEMAT, Madrid, Spain
	The High Luminosity LHC project (HL-LHC) will incorporate a new generation of superconducting elements such as high field superconducting magnets based on Nb₃Sn conductors and MgB₂ based high temperature superconducting links for magnet powering. In addition, the HL-LHC will also feature new generations of NbTi based magnets. The proper protection and diagnostics of those elements require the development of a new generation of integrated quench detection and data acquisition systems as well as novel methods for quench detection. The next generation of quench detection systems is to a large extent software defined and serves at the same time as high performance data acquisition system. The contribution will discuss the specific needs of HL-LHC in terms of quench detection and present recent results from tests with prototype magnets. The contribution will show the implementation of new quench detection methods such as current derivative sensors. Measures for increasing the system dependability and easing its maintenance will be explained, as well as the improved supervision architecture using Ethernet based field-bus systems for fast data transmission.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS036
About •	paper received ※ 07 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS046	The Limited B-Field Integral of Superconducting Longitudinal Gradient Bend Magnet	4213
	C. Chen, L. Wang, H.R. Zhang, T. Zhang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	The National Synchrotron Radiation Laboratory (NSRL) is planning a fourth generation diffraction-limited light source–Hefei Advanced Light Source (HALS), it is based on a seven-bend achromat lattice providing an ultralow natural emittance of 34 pm rad. The emittance can be even lower with the use of longitudinal gradient bends (LGBs) and anti-bends (ABs). The designed energy for HALS is 2.4 GeV, superconducting LGB might be employed instead of normal bending magnet since it can improve radiated beam critical energy to hard x-ray regions without using up any straight sections. To get a peak field about 6 T and small B-field profile full width half maximum, SLS-2 type LGB is considered. In this paper, the limited B-field integral (along the beam path) is trying to be find with some restrictions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS046
About •	paper received ※ 12 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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THPTS048	Design of Longitudinal Gradient Bending Magnet of HALS	4215
	B. Zhang, C. Chen, Z.L. Ren, X.Q. Wang, H. Xu USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Hefei Advanced Light Source (HALS) is a diffraction limited light source, which was proposed and expected to be built in the next few years by National Synchrotron Radiation Laboratory (NSRL) of China. Just like other new light sources, longitudinal gradient bending magnet (LGB) will be adopted to suppress the beam emittance. The magnet consists of 7 modules with different magnet-ic field. Each module has yoke and poles with the same size but different amount of permanent magnet to gener-ate field gradient. FeNi alloy is used to shunt magnetic flux and thus improve the temperature stability. Correc-tor coil or movable wedge can be used to adjust the field. Impact of magnetization direction error of permanent magnet block and parallelism error of poles on multi-poles is also evaluated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS048
About •	paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS053	Design of a Fast Cycled Low Loss 6 T Model Dipole Cooling at 1.9 K	4221
	A.D. Kovalenko, V.A.. Gromov, E.E. Perepelkin, G. Shirkov JINR, Dubna, Moscow Region, Russia B. Bordini, D. Tommasini CERN, Geneva, Switzerland A. Kolomiets ITEP, Moscow, Russia S. Kozub, L. Tkachenko IHEP, Moscow Region, Russia
	The option being considered for the FCC-hh high energy injector is a superconducting synchrotron replacing the CERN SPS. The new machine would operate in a cycled mode also to feed experimental areas, much like the SPS nowadays. Due to this specific cycled operation, innovative design and development approaches is required to cope with the AC losses in the superconducting cables and iron yoke. The research joins experience accumulated at CERN and JINR respectively in the design and operation of large systems operated at 1.9 K and, in fast ramped and cycled magnets. The specified parameters are the following: magnet aperture -80 mm; aperture field - 6 T; field ramp 0.2-0.5 T/s; coil conductor - NbTi; magnetic field homogeneity between 0.12 and 6 T of the order of 5·10^-4. The minimization of the cycling losses is particular important. Total thermal losses should be limited to tentatively < 2 W/m at 4.2 K. The magnet design, and the results of preliminary tests on a candidate NbTi-wire for building a model magnet are presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS053
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS062	Alternative Proposal for FCC-hh Extraction Septa	4248
	A. Sanz Ull, M.G. Atanasov, B. Balhan, J.C.C.M. Borburgh CERN, Geneva, Switzerland
	Challenging requirements are set for the FCC extraction septa magnets, notably for the magnetic field level, the septum thickness and the leak field. An alternative to the baseline FCC extraction layout with normal conducting Lambertson septa is proposed, consisting of a Superconducting Shield (SuShi) stage and a Truncated Cosine theta septa stage with the aim of reducing the necessary number of septa and installed length. The principal parameters of the septa are described and the feasibility discussed. Areas for study improvement are identified. This paper is intended for publication in the PRAB special edition.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS062
About •	paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS066	Beam Impact Experiment of 440GeV/p Protons on Superconducting Wires and Tapes in a Cryogenic Environment	4264
	A. Will, A. Bernhard, A.-S. Müller KIT, Karlsruhe, Germany Y. Bastian, B. Bordini, M. Favre, B. Lindstrom, M. Mentink, A. Monteuuis, A. Oslandsbotn, R. Schmidt, A.P. Siemko, K. Stachon, M.P. Vaananen, A.P. Verweij, A. Will, D. Wollmann CERN, Geneva, Switzerland M. Bonura, C. Senatore UNIGE, Geneva, Switzerland A. Usoskin BRUKER HTS GmbH, Alzenau, Germany
	The superconducting magnets used in high energy particle accelerators such as CERN’s LHC can be impacted by the circulating beam in case of specific failure cases. This leads to interaction of the beam particles with the magnet components, like the superconducting coils, directly or via secondary particle showers. The interaction leads to energy deposition in the timescale of microseconds and induces large thermal gradients within the superconductors in the order of 100 K/mm. To investigate the effect on the superconductors, an experiment at CERN’s HiRadMat facility was designed and executed, exposing short samples of Nb-Ti and Nb₃Sn strands as well as YBCO tape in a cryogenic environment to microsecond 440 GeV/p proton beams. The irradiated samples were extracted and are being analyzed for their superconducting properties, such as the critical transport current. This paper describes the experimental setup as well as the first results of the visual inspection of the samples.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS066
About •	paper received ※ 13 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS067	Characterisation of the Radiation Hardness of Cryogenic Bypass Diodes for the HL-LHC Inner Triplet Quadrupole Circuit	4268
	D. Wollmann, C. Cangialosi, C. Cangialosi, F. Cerutti, G. D’Angelo, S. Danzeca, R. Denz, M. Favre, R. Garcia Alia, D. Hagedorn, A. Infantino, G. Kirby, L. Kistrup, T. Koettig, J. Lendaro, B. Lindstrom, A. Monteuuis, F. Rodriguez-Mateos, A.P. Siemko, K. Stachon, A. Tsinganis, M. Valette, A.P. Verweij, A. Will CERN, Meyrin, Switzerland A. Bernhard, A.-S. Müller KIT, Karlsruhe, Germany
	Funding: Work supported by the HL-LHC Project. The powering layout of the new HL-LHC Nb₃Sn triplet circuits is the use of cryogenic bypass diodes, where the diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to radiation. Therefore, the radiation hardness of different type of bypass diodes has been tested at low temperatures in CERN’s CHARM irradiation facility during the operational year 2018. The forward characteristics, the turn on voltage and the reverse blocking voltage of each diode were measured weekly at 4.2 K and 77 K, respectively, as a function of the accumulated radiation dose. The diodes were submitted to a dose close to 12 kGy and a 1 MeV equivalent neutron fluence of 2.2x10¹⁴,n/cm². After the end of the irradiation campaign the annealing behaviour of the diodes was tested by increasing the temperature slowly to 300 K. This paper describes the experimental setup, the measurement procedure and discusses the results of the measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS067
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS071	Performance of TPS Cryogenic Permanent Magnet Undulators at NSRRC	4278
	J.C. Huang, C.S. Yang, C.K. Yang NSRRC, Hsinchu, Taiwan H. Kitamura RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan T. Kohda NEOMAX Engineering Co., Ltd., Tokyo, Japan
	Development of cryogenic permanent magnet un-dulators (CPMUs) is the most recent activity for Phase-II beamlines at the Taiwan Photon Source. A hybrid-type CPMU with a period length of 15 mm, based on PrFeB permanent-magnet materials, is under construc-tion. A maximum effective magnetic field of 1.33 T at a gap of 4 mm is obtained at 80 K.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS071
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS072	Field Measurements for a Superconducting Magnet at Room Temperature	4281
	J.C. Jan, C.-C. Chang, Y.L. Chu, J.C. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin NSRRC, Hsinchu, Taiwan
	A superconducting multipole wiggler (SMPW) was fabricated at the National Synchrotron Radiation Research Center (NSRRC) and was installed in the Synchrotron Light Research Institute (SLRI). A 3.5 T field strength could be generated by the NbTi coils and the magnetic arrays are immersed in a liquid helium (LHe) bath. A removable mapping chamber, made from thin stainless steel sheets, was developed to allow field mapping in the narrow aperture of the SMPW. The mapping chamber provides a room temperature environment for the magnetic field mapping and enables an easier field scan in the cryostat. The design for the mapping chamber includes a blockage of heat transfer from room temperature to the LHe bath and is strong enough to resist deformations during evacuation. The mechanical design, strain simulation, thermal simulation, dummy test and measurement results with the mapping chamber will be discussed in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS072
About •	paper received ※ 10 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS084	Magnet Design Optimization for Future Hadron Colliders	4307
	V.V. Kashikhin, V. Lombardo, G. Velev Fermilab, Batavia, Illinois, USA
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Fermilab in collaboration with other members of the US Magnet Development Program (MDP) is working on the development of accelerator magnets for future hadron colliders. A 4-layer, 15-T dipole with 60 mm aperture based on Nb₃Sn Low Temperature Superconductor (LTS) has been fabricated and tested. It is an important milestone of demonstrating readiness of the LTS magnet technology for the next generation of hadron colliders. At the same time, design studies aimed at boosting the magnet performance even further with the help of High Temperature Superconductors (HTS) are under way. This paper introduces a novel magnet technology - Conductor On Molded Barrel (COMB) optimized for the HTS materials and discusses possible steps towards its demonstration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS084
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS087	Micro-aligned Solenoid for Magnetized Bunched-beam Electron Cooling of 100 GeV/u Ions	4314
	P.M. McIntyre, J. Breitschopf, J. Gerity, J.N. Kellams Texas A&M University, College Station, USA J. Breitschopf, J. Gerity, J.N. Kellams, A. Sattarov ATC, College Station, Texas, USA
	Funding: This work is supported by grant DE-SC0018468 from the US Dept. of Energy. Magnetized electron cooling of ion beams requires pre-cise alignment of the electron beam with the equilibrium trajectory of the ion bunch. For the parameters required for JLEIC, a solenoid with bore field ~1 T, length ~30 m, and rms alignment of ~μrad is required. Such precise alignment has never been accomplished in a 1 T solenoid. The design of a micro-aligned solenoid is presented. A gap-separated stack of thin steel washers is located inside the solenoid. The washer stack shields transverse magnet-ic fields from its interior by a factor of ~10. A 30-washer module of the structure was built and measured using ultra-sensitive capacitive probes using a coordinate meas-uring machine. The r.m.s. coplanarity of the washer gaps was measured to be <5 μm, consistent with the required micro-alignment.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS087
About •	paper received ※ 17 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS093	Synchrotron Radiation Heating of the Helical Superconducting Undulator	4328
	J.C. Dooling, R.J. Dejus, V. Sajaev ANL, Argonne, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02- 06CH11357. A helical superconducting undulator (HSCU) was installed in the Advanced Photon Source (APS) Storage Ring (SR) during the January 2018 maintenance period. Shortly after the reintroduction of beam into the SR in late January, higher than expected heating was observed in the cryogenic cooling system. Steering the electron beam orbit in the upstream dipole provided reduction of the amount of synchrotron radiation reaching into the HSCU and allowed the device to properly cool and operate. Modeling the HSCU geometry with MARS shows the importance of Compton Scattering in transferring synchrotron photons with energies in the range of 10-100 keV through the vacuum chamber into the HSCU magnet pole and winding regions. Simulations carried out using MARS with EGS5 enabled indicate a rapid increase in transfer efficiency from the chamber wall to the HSCU with photon energy. Realistic spectral distributions of synchrotron photons are employed as input to MARS for several bending magnet field strengths.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS093
About •	paper received ※ 12 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPTS099	Fermilab Superconducting Nb₃Sn High Field Magnet R&D Program	4338
	G. Velev, G. Ambrosio, E.Z. Barzi, V.V. Kashikhin, S. Krave, V. Lombardo, I. Novitski, S. Stoynev, D. Turrioni, X. Xu, A.V. Zlobin Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. Magnets based on the modern Nb₃Sn conductor are the main candidates for future high-energy hadron colliders. Fermilab as part of the U.S. MDP executes an extensive R&D program on these high-field magnets. This program includes basic conductor and material R&D, quench per-formance studies, and building a meter-long high-field demonstrator. This paper summarizes the current status of the program including its recent results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS099
About •	paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPTS100	Measurements of Decay and Snapback in Nb₃Sn Accelerator Magnets at Fermilab	4342
	G. Velev, G. Ambrosio, G. Chlachidze, J. DiMarco, S. Stoynev, T. Strauss Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. In recent years, Fermilab has been executing an inten-sive R&D program on Nb₃Sn accelerator magnets. This program has included dipole and quadrupole models and demonstrators for various programs and projects, including the HL-LHC accelerator upgrade project. A systematic study of the field decay and snapback during the injection portion of a simulated accelerator cycle was executed at the Fermilab Magnet Test Facility. This paper summarizes the recent measurements of the MQXFS1 short quadrupole model and discusses the results of some previously measured Nb₃Sn magnets at CERN
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS100
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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FRXXPLM1	High Field Superconducting Magnet Program for Accelerators in China	4359
	Q.J. Xu IHEP, Beijing, People’s Republic of China
	High field superconducting magnets are crucial for high-energy particle accelerators. IHEP (institute for High Energy Physics, Beijing) is pursuing critical technologies R&D for future circular colliders like the Super Proton Proton Collider (SPPC). SPPC will need thousands of high field (12-20 T) superconducting magnets in around 20 years. A long term R&D roadmap of the advanced high field magnets has been made, aiming to push the technology frontier to the desired level, and a strong domestic collaboration is established, which brings together expertise of Chinese superconductivity community from fields of materials, physics, technology and engineering. The goal is to address prominent scientific and technological issues and challenges for high field applications of advanced superconducting materials. In the past year a model magnet with hybrid coils (NbTi and Nb₃Sn ) has been manufactured and tested, reaching a dipole field above 10 T in the two apertures. A full Nb₃Sn model has also been fabricated and tested with a coil made of iron based superconductor inserted in the center. An overview of the high field magnet program, R&D status and the future plans will be presented.
	Slides FRXXPLM1 [10.978 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-FRXXPLM1
About •	paper received ※ 20 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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Paper

Title

Page

High Performance ECR Sources for Next-Generation Nuclear Science Facilities

2224

D. Leitner
LBNL, Berkeley, California, USA

Modern heavy-ion accelerators require intense heavy-ion beams with high charge state. Electron Cyclotron Resonance (ECR) sources are the primary tool for generating such beams. Advances in magnet technology and an improved understanding of the ECR ion source plasma physics have led to significant improvements in ECR source performance over the last several decades. The current state of the art is represented by third-generation sources operating at frequencies around 28 GHz and peak coil fields of about 7 T using NbTi conductor. Fourth-generation ECR ion sources with an operating frequency above 40 GHz have the potential to quadruple the source output beam current. These sources will need to incorporate advanced conductor technologies and/or novel coil configurations in order to exceed the limitations of the present structures. This talk will present worldwide efforts currently underway to develop high-performance ECR sources using new design approaches in support of next-generation nuclear physics facilities.

Slides WEXPLS1 [8.012 MB]

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paper received ※ 16 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS001

Development of Cryogenic Suspension in the ANU 8t Superconducting Solenoid With Iron Yoke

4103

S.T. Battisson, N.R. Lobanov, D. Tsifakis, T.B. Tunningley
Research School of Physics and Engineering, Australian National University, Canberra, Australian Capitol Territory, Australia
J.F. Smith
University of Surrey, Department of Physics, Guildford, United Kingdom

Funding: The Australian Federal Government Superscience/EIF funding under the NCRIS mechanism.
An 8 Tesla superconducting solenoid was commissioned at The Australian National University to make precision measurements of fusion cross-sections. Forces between the solenoid and the iron yoke that houses it must always be maintained within safe limits and precision location of the solenoid coil is necessary to achieve this. Thermal contraction of components can impact the locating structure of the solenoid coil, leading to unsafe forces. Improvements to this structure allowed successful completion of the first fusion measurements with the 8T solenoidal separator, and demonstrated that it is now ready for a program of fusion measurements.

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS010

Start of the Series Production for the Cryogenic Magnet Corrector Modules of FAIR

4124

E.S. Fischer, A. Bleile, V.I. Datskov, V. Marusov, J.P. Meier, P.J. Spiller
GSI, Darmstadt, Germany

The fast cycling superconducting synchrotron SIS100 has to deliver high intensity beams for the FAIR project at GSI, Darmstadt. The main dipoles will ramp with 4 T/s up to a maximum magnetic field of 1.9 T where the field gradient of the main quadrupole will reach 27.77 T/m. The integral magnetic field length of the horizontal/vertical steerer and of the chromaticity sextupole will provide 0.403/0.41 m and 0.383 m respectively. We present the status of the first magnets test results as well as the overall procedure of production and testing of the complete series of the cryomagnetic corrector modules.

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS011

Design, Production, and Testing of Superconducting Magnets for the Super-FRS

4128

H. Müller, E.J. Cho, G. Golluccio, C. Roux, H. Simon, K. Sugita, M. Winkler
GSI, Darmstadt, Germany
H. Allain, M. Daly, P. Grafin, A. Madur, J.-E. Munoz-Garcia, L. Quettier, H. Reymond
CEA-IRFU, Gif-sur-Yvette, France
A. Borceto, G. Drago, G. Valesi, D. Ventura
ASG, Genova, Italy
J. Lucas
Elytt Energy, Madrid, Spain
L.X. Van Den Boogaard
CERN, Geneva, Switzerland

The Super FRS is a two-stage in flight separator to be built next to the site of GSI, Darmstadt, Germany as part of FAIR (Facility for Anti-proton and Ion Research). Its purpose is to create and separate rare isotope beams and to enable the mass measurement also for very short lived nuclei. Due to its three branches a wide variety of experiments can be carried out in frame of the NUSTAR collaboration. Due to the large acceptance needed, the magnets of the Super-FRS have to have a large aperture and therefore only a superconducting solution is feasible. A superferric design with superconducting coils was chosen in which the magnetic field is shaped by an iron yoke. For the dipoles this iron yoke is at warm and only the coils are incorporated in a cryostat. The multiplets, assemblies of quadrupoles and higher order multipole magnets, are completely immersed in a liquid Helium bath. With the exception of special branching dipoles all superconducting magnets of Super-FRS have been contracted and are being built by Elytt in Spain (dipoles) and ASG in Italy (multiplets). The cold test of all magnets will take place in a dedicated test facility at CERN. This contribution will present the status of manufacturing of dipoles and multiplets, and also gives a short overview on the test facility.

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS015

Design and Manufacturing of the First Multiplet for the Super-FRS at FAIR

4138

E.J. Cho, H. Müller, C. Roux, K. Sugita, M. Winkler
GSI, Darmstadt, Germany
A. Borceto, G. Drago, G. Valesi, D. Ventura
ASG, Genova, Italy

The Super-FRS (Superconducting FRagment Separator) at FAIR is a two-stage in flight separator, which aims to produce rare isotopes of all elements up to Uranium and separate them spatially within a few hundred nanoseconds so that a study of very short lived nuclei can be performed efficiently. In total, it is required to construct 24 dipoles and 170 multipole magnets (quadrupole, sextupole, octupole and steering dipole). Due to the limit of space, the multipole magnets will be arranged as a group (2 ~ 9 magnets) in a common cryostat and they are called as a multiplet. The design challenge of the multiplet lies in a strong iron saturation of the quadrupole leading to disturb the field quality and high design pressure of the He vessel (20 bars). The first multiplet for the Super-FRS is constructed. The magnet column consisting of one quadrupole and one sextupole is cooled in a He vessel filled with up-to 800 liters of liquid He. The both magnets are superferric type and have a large warm bore radius of 190 mm. This paper presents the design overview and the manufacturing status of the first multiplet.

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paper received ※ 12 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS030

HEPS-TF Superconducting Wiggler Control System

4174

J.C. Wang, C.P. Chu, Y. Gao, Q. Le, J. Liu, R. Ye, M.C. Zhan
IHEP, Beijing, People’s Republic of China

Funding: HEPS-TF
Superconducting Wiggler (SCW) is an important development direction of insertion devices for modern light sources. It is also the key technology of High Energy Photon Source Test Facility (HEPS-TF) insertion device system research. SCW control system involves power supply, cryogenics，vacuum and other devices, control. Serial port server was built for the SCW control system, with EPICS DB to make the PID algorithm for heater and superconductor cavity pressure, temperature, and with Ziegler-Nichols method to quickly find appropriate PID parameters.

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS036

Quench Detection and Diagnostic Systems for the Superconducting Circuits for the HL-LHC

4183

R. Denz, D.O. Calcoen, E. De Matteis, V. Froidbise, S. Georgakakis, S. Haas, S. Mundra, T. Podzorny, A.P. Siemko, J. Spasic, J. Steckert
CERN, Geneva, Switzerland
D. Blasco Serrano
CIEMAT, Madrid, Spain

The High Luminosity LHC project (HL-LHC) will incorporate a new generation of superconducting elements such as high field superconducting magnets based on Nb₃Sn conductors and MgB₂ based high temperature superconducting links for magnet powering. In addition, the HL-LHC will also feature new generations of NbTi based magnets. The proper protection and diagnostics of those elements require the development of a new generation of integrated quench detection and data acquisition systems as well as novel methods for quench detection. The next generation of quench detection systems is to a large extent software defined and serves at the same time as high performance data acquisition system. The contribution will discuss the specific needs of HL-LHC in terms of quench detection and present recent results from tests with prototype magnets. The contribution will show the implementation of new quench detection methods such as current derivative sensors. Measures for increasing the system dependability and easing its maintenance will be explained, as well as the improved supervision architecture using Ethernet based field-bus systems for fast data transmission.

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paper received ※ 07 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS046

The Limited B-Field Integral of Superconducting Longitudinal Gradient Bend Magnet

4213

C. Chen, L. Wang, H.R. Zhang, T. Zhang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

The National Synchrotron Radiation Laboratory (NSRL) is planning a fourth generation diffraction-limited light source–Hefei Advanced Light Source (HALS), it is based on a seven-bend achromat lattice providing an ultralow natural emittance of 34 pm rad. The emittance can be even lower with the use of longitudinal gradient bends (LGBs) and anti-bends (ABs). The designed energy for HALS is 2.4 GeV, superconducting LGB might be employed instead of normal bending magnet since it can improve radiated beam critical energy to hard x-ray regions without using up any straight sections. To get a peak field about 6 T and small B-field profile full width half maximum, SLS-2 type LGB is considered. In this paper, the limited B-field integral (along the beam path) is trying to be find with some restrictions.

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paper received ※ 12 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPTS048

Design of Longitudinal Gradient Bending Magnet of HALS

4215

B. Zhang, C. Chen, Z.L. Ren, X.Q. Wang, H. Xu
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Hefei Advanced Light Source (HALS) is a diffraction limited light source, which was proposed and expected to be built in the next few years by National Synchrotron Radiation Laboratory (NSRL) of China. Just like other new light sources, longitudinal gradient bending magnet (LGB) will be adopted to suppress the beam emittance. The magnet consists of 7 modules with different magnet-ic field. Each module has yoke and poles with the same size but different amount of permanent magnet to gener-ate field gradient. FeNi alloy is used to shunt magnetic flux and thus improve the temperature stability. Correc-tor coil or movable wedge can be used to adjust the field. Impact of magnetization direction error of permanent magnet block and parallelism error of poles on multi-poles is also evaluated.

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS053

Design of a Fast Cycled Low Loss 6 T Model Dipole Cooling at 1.9 K

4221

A.D. Kovalenko, V.A.. Gromov, E.E. Perepelkin, G. Shirkov
JINR, Dubna, Moscow Region, Russia
B. Bordini, D. Tommasini
CERN, Geneva, Switzerland
A. Kolomiets
ITEP, Moscow, Russia
S. Kozub, L. Tkachenko
IHEP, Moscow Region, Russia

The option being considered for the FCC-hh high energy injector is a superconducting synchrotron replacing the CERN SPS. The new machine would operate in a cycled mode also to feed experimental areas, much like the SPS nowadays. Due to this specific cycled operation, innovative design and development approaches is required to cope with the AC losses in the superconducting cables and iron yoke. The research joins experience accumulated at CERN and JINR respectively in the design and operation of large systems operated at 1.9 K and, in fast ramped and cycled magnets. The specified parameters are the following: magnet aperture -80 mm; aperture field - 6 T; field ramp 0.2-0.5 T/s; coil conductor - NbTi; magnetic field homogeneity between 0.12 and 6 T of the order of 5·10^-4. The minimization of the cycling losses is particular important. Total thermal losses should be limited to tentatively < 2 W/m at 4.2 K. The magnet design, and the results of preliminary tests on a candidate NbTi-wire for building a model magnet are presented and discussed.

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS062

Alternative Proposal for FCC-hh Extraction Septa

4248

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

Challenging requirements are set for the FCC extraction septa magnets, notably for the magnetic field level, the septum thickness and the leak field. An alternative to the baseline FCC extraction layout with normal conducting Lambertson septa is proposed, consisting of a Superconducting Shield (SuShi) stage and a Truncated Cosine theta septa stage with the aim of reducing the necessary number of septa and installed length. The principal parameters of the septa are described and the feasibility discussed. Areas for study improvement are identified.
This paper is intended for publication in the PRAB special edition.

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paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS066

Beam Impact Experiment of 440GeV/p Protons on Superconducting Wires and Tapes in a Cryogenic Environment

4264

A. Will, A. Bernhard, A.-S. Müller
KIT, Karlsruhe, Germany
Y. Bastian, B. Bordini, M. Favre, B. Lindstrom, M. Mentink, A. Monteuuis, A. Oslandsbotn, R. Schmidt, A.P. Siemko, K. Stachon, M.P. Vaananen, A.P. Verweij, A. Will, D. Wollmann
CERN, Geneva, Switzerland
M. Bonura, C. Senatore
UNIGE, Geneva, Switzerland
A. Usoskin
BRUKER HTS GmbH, Alzenau, Germany

The superconducting magnets used in high energy particle accelerators such as CERN’s LHC can be impacted by the circulating beam in case of specific failure cases. This leads to interaction of the beam particles with the magnet components, like the superconducting coils, directly or via secondary particle showers. The interaction leads to energy deposition in the timescale of microseconds and induces large thermal gradients within the superconductors in the order of 100 K/mm. To investigate the effect on the superconductors, an experiment at CERN’s HiRadMat facility was designed and executed, exposing short samples of Nb-Ti and Nb₃Sn strands as well as YBCO tape in a cryogenic environment to microsecond 440 GeV/p proton beams. The irradiated samples were extracted and are being analyzed for their superconducting properties, such as the critical transport current. This paper describes the experimental setup as well as the first results of the visual inspection of the samples.

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THPTS067

Characterisation of the Radiation Hardness of Cryogenic Bypass Diodes for the HL-LHC Inner Triplet Quadrupole Circuit

4268

D. Wollmann, C. Cangialosi, C. Cangialosi, F. Cerutti, G. D’Angelo, S. Danzeca, R. Denz, M. Favre, R. Garcia Alia, D. Hagedorn, A. Infantino, G. Kirby, L. Kistrup, T. Koettig, J. Lendaro, B. Lindstrom, A. Monteuuis, F. Rodriguez-Mateos, A.P. Siemko, K. Stachon, A. Tsinganis, M. Valette, A.P. Verweij, A. Will
CERN, Meyrin, Switzerland
A. Bernhard, A.-S. Müller
KIT, Karlsruhe, Germany

Funding: Work supported by the HL-LHC Project.
The powering layout of the new HL-LHC Nb₃Sn triplet circuits is the use of cryogenic bypass diodes, where the diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to radiation. Therefore, the radiation hardness of different type of bypass diodes has been tested at low temperatures in CERN’s CHARM irradiation facility during the operational year 2018. The forward characteristics, the turn on voltage and the reverse blocking voltage of each diode were measured weekly at 4.2 K and 77 K, respectively, as a function of the accumulated radiation dose. The diodes were submitted to a dose close to 12 kGy and a 1 MeV equivalent neutron fluence of 2.2x10¹⁴,n/cm². After the end of the irradiation campaign the annealing behaviour of the diodes was tested by increasing the temperature slowly to 300 K. This paper describes the experimental setup, the measurement procedure and discusses the results of the measurements.

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS071

Performance of TPS Cryogenic Permanent Magnet Undulators at NSRRC

4278

J.C. Huang, C.S. Yang, C.K. Yang
NSRRC, Hsinchu, Taiwan
H. Kitamura
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
T. Kohda
NEOMAX Engineering Co., Ltd., Tokyo, Japan

Development of cryogenic permanent magnet un-dulators (CPMUs) is the most recent activity for Phase-II beamlines at the Taiwan Photon Source. A hybrid-type CPMU with a period length of 15 mm, based on PrFeB permanent-magnet materials, is under construc-tion. A maximum effective magnetic field of 1.33 T at a gap of 4 mm is obtained at 80 K.

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THPTS072

Field Measurements for a Superconducting Magnet at Room Temperature

4281

J.C. Jan, C.-C. Chang, Y.L. Chu, J.C. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin
NSRRC, Hsinchu, Taiwan

A superconducting multipole wiggler (SMPW) was fabricated at the National Synchrotron Radiation Research Center (NSRRC) and was installed in the Synchrotron Light Research Institute (SLRI). A 3.5 T field strength could be generated by the NbTi coils and the magnetic arrays are immersed in a liquid helium (LHe) bath. A removable mapping chamber, made from thin stainless steel sheets, was developed to allow field mapping in the narrow aperture of the SMPW. The mapping chamber provides a room temperature environment for the magnetic field mapping and enables an easier field scan in the cryostat. The design for the mapping chamber includes a blockage of heat transfer from room temperature to the LHe bath and is strong enough to resist deformations during evacuation. The mechanical design, strain simulation, thermal simulation, dummy test and measurement results with the mapping chamber will be discussed in this paper.

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paper received ※ 10 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS084

Magnet Design Optimization for Future Hadron Colliders

4307

V.V. Kashikhin, V. Lombardo, G. Velev
Fermilab, Batavia, Illinois, USA

Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
Fermilab in collaboration with other members of the US Magnet Development Program (MDP) is working on the development of accelerator magnets for future hadron colliders. A 4-layer, 15-T dipole with 60 mm aperture based on Nb₃Sn Low Temperature Superconductor (LTS) has been fabricated and tested. It is an important milestone of demonstrating readiness of the LTS magnet technology for the next generation of hadron colliders. At the same time, design studies aimed at boosting the magnet performance even further with the help of High Temperature Superconductors (HTS) are under way. This paper introduces a novel magnet technology - Conductor On Molded Barrel (COMB) optimized for the HTS materials and discusses possible steps towards its demonstration.

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS087

Micro-aligned Solenoid for Magnetized Bunched-beam Electron Cooling of 100 GeV/u Ions

4314

P.M. McIntyre, J. Breitschopf, J. Gerity, J.N. Kellams
Texas A&M University, College Station, USA
J. Breitschopf, J. Gerity, J.N. Kellams, A. Sattarov
ATC, College Station, Texas, USA

Funding: This work is supported by grant DE-SC0018468 from the US Dept. of Energy.
Magnetized electron cooling of ion beams requires pre-cise alignment of the electron beam with the equilibrium trajectory of the ion bunch. For the parameters required for JLEIC, a solenoid with bore field ~1 T, length ~30 m, and rms alignment of ~μrad is required. Such precise alignment has never been accomplished in a 1 T solenoid. The design of a micro-aligned solenoid is presented. A gap-separated stack of thin steel washers is located inside the solenoid. The washer stack shields transverse magnet-ic fields from its interior by a factor of ~10. A 30-washer module of the structure was built and measured using ultra-sensitive capacitive probes using a coordinate meas-uring machine. The r.m.s. coplanarity of the washer gaps was measured to be <5 μm, consistent with the required micro-alignment.

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paper received ※ 17 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS093

Synchrotron Radiation Heating of the Helical Superconducting Undulator

4328

J.C. Dooling, R.J. Dejus, V. Sajaev
ANL, Argonne, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02- 06CH11357.
A helical superconducting undulator (HSCU) was installed in the Advanced Photon Source (APS) Storage Ring (SR) during the January 2018 maintenance period. Shortly after the reintroduction of beam into the SR in late January, higher than expected heating was observed in the cryogenic cooling system. Steering the electron beam orbit in the upstream dipole provided reduction of the amount of synchrotron radiation reaching into the HSCU and allowed the device to properly cool and operate. Modeling the HSCU geometry with MARS shows the importance of Compton Scattering in transferring synchrotron photons with energies in the range of 10-100 keV through the vacuum chamber into the HSCU magnet pole and winding regions. Simulations carried out using MARS with EGS5 enabled indicate a rapid increase in transfer efficiency from the chamber wall to the HSCU with photon energy. Realistic spectral distributions of synchrotron photons are employed as input to MARS for several bending magnet field strengths.

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paper received ※ 12 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS099

Fermilab Superconducting Nb₃Sn High Field Magnet R&D Program

4338

G. Velev, G. Ambrosio, E.Z. Barzi, V.V. Kashikhin, S. Krave, V. Lombardo, I. Novitski, S. Stoynev, D. Turrioni, X. Xu, A.V. Zlobin
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
Magnets based on the modern Nb₃Sn conductor are the main candidates for future high-energy hadron colliders. Fermilab as part of the U.S. MDP executes an extensive R&D program on these high-field magnets. This program includes basic conductor and material R&D, quench per-formance studies, and building a meter-long high-field demonstrator. This paper summarizes the current status of the program including its recent results.

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THPTS100

Measurements of Decay and Snapback in Nb₃Sn Accelerator Magnets at Fermilab

4342

G. Velev, G. Ambrosio, G. Chlachidze, J. DiMarco, S. Stoynev, T. Strauss
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
In recent years, Fermilab has been executing an inten-sive R&D program on Nb₃Sn accelerator magnets. This program has included dipole and quadrupole models and demonstrators for various programs and projects, including the HL-LHC accelerator upgrade project. A systematic study of the field decay and snapback during the injection portion of a simulated accelerator cycle was executed at the Fermilab Magnet Test Facility. This paper summarizes the recent measurements of the MQXFS1 short quadrupole model and discusses the results of some previously measured Nb₃Sn magnets at CERN

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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FRXXPLM1

High Field Superconducting Magnet Program for Accelerators in China

4359

Q.J. Xu
IHEP, Beijing, People’s Republic of China

High field superconducting magnets are crucial for high-energy particle accelerators. IHEP (institute for High Energy Physics, Beijing) is pursuing critical technologies R&D for future circular colliders like the Super Proton Proton Collider (SPPC). SPPC will need thousands of high field (12-20 T) superconducting magnets in around 20 years. A long term R&D roadmap of the advanced high field magnets has been made, aiming to push the technology frontier to the desired level, and a strong domestic collaboration is established, which brings together expertise of Chinese superconductivity community from fields of materials, physics, technology and engineering. The goal is to address prominent scientific and technological issues and challenges for high field applications of advanced superconducting materials. In the past year a model magnet with hybrid coils (NbTi and Nb₃Sn ) has been manufactured and tested, reaching a dipole field above 10 T in the two apertures. A full Nb₃Sn model has also been fabricated and tested with a coil made of iron based superconductor inserted in the center. An overview of the high field magnet program, R&D status and the future plans will be presented.

Slides FRXXPLM1 [10.978 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-FRXXPLM1

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paper received ※ 20 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)