IPAC2014 - Classification: 07 Accelerator Technology Main Systems / T10 Superconducting Magnets

Paper	Title	Page
TUZB02	Prospects for the use of HTS in High-field Magnets for Future Accelerator Facilities	974
	A. Ballarino CERN, Geneva, Switzerland
	The enthusiasm that followed the discovery of High Temperature Superconductors (HTS) and the hope that they could replace Low Temperature Superconductors (LTS) was damped by low current-carrying capacity, short piece lengths, and fragility of the brittle oxide materials. Development of applications was mainly on devices less demanding of conductor performance. However, with continuing development, progress was made with the cuprate superconductors, and long lengths of BSCCO 2223 and REBCO tape conductors are now commercially available. Progress has also been made in the development of BSSCO 2212 round wire, where implementation of a new production process has led to a breakthrough in performance. Though still at the research level, attainments in material synthesis and theoretical understanding of iron-based materials may lead to their development into practical superconductors, featuring high upper critical field and low anisotropy. A review of the potential of HTS as applied to accelerators is presented, with a focus on using the presently available materials and on the perceived needs for further development.
	Slides TUZB02 [2.331 MB]
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TUOCB02	High-field Magnet Development toward the High Luminosity LHC	983
	G. Apollinari Fermilab, Batavia, Illinois, USA
	The upcoming Luminosity upgrade of the LHC (HL-LHC) will rely on the use of Accelerator Quality Nb3Sn Magnets which have been the focus of an intense R&D effort in the last decade. This contribution will describe the R&D and results of Nb3Sn Accelerator Quality High Field Magnets development efforts, with emphasis on the activities considered for the HL-LHC upgrades.
	Slides TUOCB02 [5.103 MB]
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WEPRO045	Design of a System at NSRRC to Measure the Field for an In-vacuum Cryogenic Undulator with Permanent Magnet	2041
	C.K. Yang, C.-H. Chang, T.Y. Chung, J.C. Huang, C.-S. Hwang, Y.Y. Lin NSRRC, Hsinchu, Taiwan
	A cryogenic undulator with a permanent magnet (CPMU) is an important insertion device now under construction at NSRRC. For an undulator of this kind, the distribution of the magnetic field must be measured along the axis; the phase error, trajectory and photon flux must be calculated after the magnetic arrays are installed in the vacuum chamber and cooled to cryogenic temperature. We developed a Hall-probe system to measure the magnetic field in an evacuated environment; this system uses lasers and stages to monitor and to correct dynamically the positions of the Hall probe. All components installed inside the vacuum chamber are compatible with an environment of high vacuum and low temperature. The details of the design and completed fabrication are presented in this paper.
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WEPRI083	The SIS100 Superconducting Fast Ramped Dipole Magnet	2681
	E.S. Fischer, A. Bleile, J.P. Meier, A. Mierau, P. Schnizer GSI, Darmstadt, Germany P.G. Akishin JINR, Dubna, Moscow Region, Russia
	The first dipole magnet of the superconducting SIS100 accelerator was delivered by industry and its thermodynamic, electrical and magnetic field performance was measured. We describe the build of the test facility, the infrastructure and its performance, outline the chosen measurement methods along with the optimisation of the magnet end required for obtaining the requested integral field quality. The measured ac loss parameters will be discussed in respect of the possible operation performance of the whole machine, the relevant cooling conditions of the main dipole magnet.
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WEPRI084	Magnetic Field Optimization of SIS100 Quadrupole Units	2684
	K. Sugita, E.S. Fischer, A. Mierau, P. Schnizer GSI, Darmstadt, Germany P.G. Akishin JINR, Dubna, Moscow Region, Russia
	Superconducting heavy ion synchrotron SIS100 is the central accelerator of the FAIR accelerator complex. There are more than 10 types of the quadrupole units in SIS100 due to the combination of the quadrupoles from 3 families and several types of the corrector magnets. Magnetic field optimization of the quadrupole magnet ends including evaluation of cross talk between closely attached quadrupole and corrector magnets will be reported.
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WEPRI085	The Elettra 3.5 T Superconducting Wiggler Refurbishment	2687
	D. Zangrando, R. Bracco, D. Castronovo, M. Cautero, E. Karantzoulis, S. Krecic, G.L. Loda, D. Millo, L. Pivetta, G. Scalamera, R. Visintini Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy S.V. Khrushchev, N.A. Mezentsev, V.A. Shkaruba, V.M. Syrovatin, O.A. Tarasenko, V.M. Tsukanov, A.A. Volkov BINP SB RAS, Novosibirsk, Russia
	A 3.5 Tesla 64 mm period superconducting wiggler (SCW) was constructed by the Russian Budker Institute of Novosibirsk (BINP) and installed in the Elettra storage ring as a photon source for the second X-ray diffraction beamline in November 2002, but never used due to the lack of the funding required for the beamline construction. About three years ago, the beamline construction was finally funded together with the refurbishment of the SCW. This upgrade, that was necessary in order to make the SCW operations compatible with the top up mode of the storage ring aimed in a drastic reduction of the liquid helium consumption by means of replacing the cryostat with a new version. At the same time the upgrade aimed as well to improve the reliability of the cryostat, to update the control system and to verify the magnetic field performance after a very long time of inactivity. In this paper we present and discuss the performances of the SCW following its refurbishment carried out by BINP team and its re-commissioning in the Elettra storage ring.
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WEPRI086	Three Dimensional Field Analysis for Final Focus Magnet System at SuperKEKB	2690
	Y. Arimoto, N. Ohuchi, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan B. Parker, P. Wanderer BNL, Upton, Long Island, New York, USA
	SuperKEKB is an upgrade accelerator of KEKB with a design luminosity of 8x10³⁵ cm^-2 s^-1. The design is based on a "nano-beam scheme", where vertical beam size is squeezed into 50 nm at an interaction point. One of key component is a final focus magnet system. The focusing system consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. They are aligned in a detector (Belle-II) solenoid which generates a longitudinal field of 1.5 T. The system are packed in a small area and also has magnetic shields. So it is expected an entire magnetic field of the system is not one which is linearly-superimposed field of each magnet. Here a study of three dimensional field analysis for the final focus magnet system will be presented.
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WEPRI087	Magnetic Field Measurement System for the SuperKEKB Final Focus Superconducting Magnets	2693
	N. Ohuchi, Y. Arimoto, M. Iwasaki, M.K. Kawai, Y. Kondo, Y. Makida, K. Tsuchiya, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan
	SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The magnetic field measurement systems with the vertical cryostats were designed and constructed for performing the acceptance test of these magnets at 4 K. The field measurements are performed by the 6 different harmonic coils and a Hall probe. The higher order multi-pole field distributions along the magnet axes are very important for the beam operation, and then these distributions are measured with the 20 mm long harmonic coils. The integral fields of quadrupole magnets are measured with the 600 mm long harmonic coils. We will describe the magnetic field measurement system.
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WEPRI088	Magnetic Measurement System for the NICA Booster Magnets	2696
	V.V. Borisov, A. Donyagin, O. Golubitsky, A. Golunov, N. Gorbunov, H.G. Khodzhibagiyan, N.A. Morozov, S. Rubtsun JINR, Dubna, Moscow Region, Russia
	NICA is a new accelerator collider complex presently under construction at Joint Institute for 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. The first phase of the system for magnetic measurements was commissioned in late 2013. A method of measuring the quality of the magnetic field in the aperture of the curved dipole magnet for the booster synchrotron is described. First results of magnetic measurements are presented and discussed. Commissioning of equipment for magnetic measurements in the aperture of quadrupole magnets for the NICA booster is close to completion.
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WEPRI089	Facility for Assembling and Serial Test of Superconducting Magnets	2700
	S.A. Kostromin, N.N. Agapov, V.V. Borisov, A.R. Galimov, V. Karpinsky, H.G. Khodzhibagiyan, V.S. Korolev, D. Nikiforov, N.V. Semin, A.Y. Starikov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	The NICA/MPD project has been started at the Joint Institute for Nuclear Research (JINR) in Dubna in 2007. The NICA accelerator complex will consist of two injector chains, the new 600 MeV/u superconducting (SC) booster synchrotron, the existing SC synchrotron Nuclotron, and the new SC collider having two rings each of 503 m in circumference. The building construction of the new test facility for simultaneous cryogenic testing of the SC magnets on 6 benches is completed at the Laboratory of High Energy Physics. Premises with an area of 2600 m2 were prepared to install the equipment. The 15 kA, 25 V pulse power supply, the helium satellite refrigerator with capacity of 100 W were commissioned first bench for magnets testing is now under assembling. First magnets cryogenic tests are planned on July. Start of the serial production of the SC magnets for the booster synchrotron is planned for the end of 2014.
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WEPRI091	Superconducting Multipole Wigglers: State of the Art	4103
	N.A. Mezentsev, S.V. Khrushchev, V.K. Lev, V.A. Shkaruba, V.M. Syrovatin, V.M. Tsukanov BINP SB RAS, Novosibirsk, Russia
	Superconducting multipole wigglers installed on synchrotron radiation sources are the powerful tools for researches in various areas of science and technics. SuperConducting Multipole Wigglers (SCMWs) represent sign-alternating sequence of magnets with lateral magnetic field. Relativistic electrons, passing through such set of magnetic elements, create radiation with properties of synchrotron radiations depending on maximum field its period and poles number. The first superconducting wiggler has been made and installed on the VEPP-3 electron storage ring as generator of synchrotron radiation in 1979. Nowadays tens of wigglers are successfully working in the various synchrotron radiation centers and more than 10 of them were developed and made in Budker INP. These wigglers may be divided into 3 groups: 1- Short period 3-3.5 cm with field ~2-2.5 Tesla 2- Medium period 4.8-6 cm with field ~ 3.5-4.5 Tesla 3- Long period 14.5-20 cm with field 7-7.5Tesla. The description of magnetic properties of the wigglers, parameters of both cryogenic and vacuum systems and their technical decisions are presenteded in the report.
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WEPRI092	Test and Simulation Results for Quenches Induced by Fast Losses on a LHC Quadrupole	2706
	C. Bracco, B. Auchmann, W. Bartmann, M. Bednarek, A. Lechner, M. Sapinski, R. Schmidt, N.V. Shetty, M. Solfaroli Camillocci, A.P. Verweij CERN, Geneva, Switzerland
	A test program for beam induced quenches was started in the LHC in 2011 in order to reduce as much as possible BLM-triggered beam dumps, without jeopardizing the safety of the superconducting magnets. A first measurement was performed to assess the quench level of a quadrupole located in the LHC injection region in case of fast (ns) losses. It consisted in dumping single bunches onto an injection protection collimator located right upstream of the quadrupole, varying the bunch intensity up to 3·10¹⁰ protons and ramping the quadrupole current up to 2200 A. No quench was recorded at that time. The test was repeated in 2013 with increased bunch intensity (6·10¹⁰ protons); a quench occurred when powering the magnet at 2500 A. The comparison between measurements during beam induced and quench heaters induced quenches is shown. Results of FLUKA simulations on energy deposition, calculations on quench behaviour using QP3 and the respective estimates of quench levels are also presented.
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WEPRI093	Welding and Quality Control for the Consolidation of the LHC Superconducting Magnets and Circuits	2709
	S. Atieh, M. Bernardini, F.F. Bertinelli, P. Cruikshank, J.M. Dalin, G. Favre, V. Kain, D. Lombard, A. Perin, M. Pojer, G. Rasul, D. Rey, R. Rizwan, F. Savary, J.Ph. G. L. Tock CERN, Geneva, Switzerland
	The first LHC long shutdown was driven by the need to consolidate the 13 kA splices between the superconducting magnets to safely attain its center of mass design energy of 14 TeV. Access to the splices requires the opening of welded sleeves by machining. After consolidation, the sleeves are re-welded using a TIG orbital welding. The welding process has been modified from the original “as-new” installation in order to better adapt to the “as repaired” situation. The intervention has been thoroughly prepared through qualifications, organisation of teams, their training and follow-up. Quality control is based on the qualification of equipment, process and operators; the recording of production parameters; regular process audits and production witness samples; visual inspection through an official certifying body. The paper also describes welding and quality control of special intervention cases, with issues of difficult access requiring innovative solutions. This work concerns over 10 000 welds and a team of 40 engineers and technicians over a period of 18 months. The experience and lessons learnt will be applicable to similar large complex projects.
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WEPRI094	Conceptual Design Study of the High Luminosity LHC Recombination Dipole	2712
	G.L. Sabbi, X. Wang LBNL, Berkeley, California, USA G. Arduini, M. Giovannozzi, E. Todesco CERN, Geneva, Switzerland
	Funding: Work supported by the U.S. DOE LHC Accelerator Research Program. The HiLumi LHC Design Study is partly funded by the European Commission within the Framework Programme 7. The interaction region design of the High-Luminosity LHC requires replacing the recombination dipole magnets (D2) with new ones. The preliminary specifications include an aperture of 10⁵ mm, with 186 mm separation between the twin-aperture axes, and an operating field in the range of 3.5 to 4.5 T. The main design challenge is to decouple the magnetic field in the two apertures and ensure good field quality. In this paper, we present a new approach to address these issues, and provide expected harmonics for geometric, saturation and persistent current effects. The feasibility of an operating field at the high end of the range considered is also discussed, to minimize the D2 magnet length and facilitate the space allocation for other components.
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WEPRI095	Modelling of a Short-period Superconducting Undulator	2716
	B.J.A. Shepherd, J.A. Clarke STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom V. Bayliss, T.W. Bradshaw STFC/RAL, Chilton, Didcot, Oxon, United Kingdom E.C. Longhi DLS, Oxfordshire, United Kingdom
	STFC, in collaboration with Diamond Light Source, are designing and building a 15.5 mm period, 1.26 T superconducting undulator. This paper describes the modelling of the undulator, using Radia and Opera. Extensive numerical modelling has been carried out to simulate the effect of manufacturing tolerances on the quality of the magnetic field, in order to meet the demanding 3° rms phase error specification.
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WEPRI096	Mu2e Magnetic Measurements	2719
	M. Buehler, M.A. Tartaglia, J.C. Tompkins Fermilab, Batavia, Illinois, USA C.R. Orozco University of Illinois at Urbana-Champaign, Illinois, USA
	The Mu2e experiment at Fermilab is designed to explore charged lepton flavor violation by searching for muon-to-electron conversion. The magnetic field generated by a system of solenoids is crucial for Mu2e and requires accurate characterization to detect any flaws and to produce a detailed field map. Stringent physics goals are driving magnetic field specifications for the Mu2e solenoids. A field mapper is being designed, which will produce detailed magnetic field maps. The uniform field region of the spectrometer volume requires the highest level of precision (1 Gauss per 1 Tesla). During commissioning, multiple magnetic field maps will be generated to verify proper alignment of all magnet coils, and to create the final magnetic field map. In order to design and build a precise field mapping system consisting of Hall and NRM probes, tolerances and precision for such a system need to be evaluated. In this paper we present a design for the Mu2e field mapping hardware, and discuss results from OPERA-3D simulations to specify parameters for Hall and NMR probes. We also present a fitting procedure for the analytical treatment of our expected magnetic measurements.
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WEPRI097	STATUS OF 11 T 2-IN-1 Nb3Sn DIPOLE DEVELOPMENT FOR LHC	2722
	A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, R. Bossert, M. Buehler, G. Chlachidze, J. DiMarco, A. Nobrega, I. Novitski, D. Turrioni, G. Velev Fermilab, Batavia, Illinois, USA B. Auchmann, M. Karppinen, L. Rossi, D. Smekens CERN, Geneva, Switzerland
	Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404 The LHC upgrade plans foresee installation of additional collimators in the LHC lattice. To provide the necessary longitudinal space for these collimators, shorter and stronger Nb3Sn dipoles compatible with the LHC lattice and main systems could be used. This paper describes the design and status of the twin-aperture Nb3Sn dipole being developed by FNAL and CERN for the LHC, and reports test results of two collared coils to be used in the first 1 m long twin-aperture dipole model.
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WEPRI098	QUENCH PROTECTION STUDIES OF 11T Nb3Sn DIPOLE MODELS FOR LHC UPGRADES	2725
	A.V. Zlobin, G. Chlachidze, A. Nobrega, I. Novitski Fermilab, Batavia, Illinois, USA M. Karppinen CERN, Geneva, Switzerland
	Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy CERN and FNAL are developing 11 T Nb3Sn dipole magnets for the LHC collimation system upgrade. Due to the large stored energy, protection of these magnets during a quench is a challenging problem. This paper reports the results of experimental studies of key quench protection parameters including longitudinal and radial quench propagation in the coil, coil heating due to a quench, and energy extraction and quench-back effect. The studies were performed using a 1 m long 11 T Nb3Sn dipole coil tested in a magnetic mirror configuration.
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WEPRI099	Testing of a Single 11 T Nb3Sn Dipole Coil Using a Dipole Mirror Structure	2728
	A.V. Zlobin, N. Andreev, E.Z. Barzi, G. Chlachidze, V.V. Kashikhin, A. Nobrega, I. Novitski, D. Turrioni Fermilab, Batavia, Illinois, USA M. Karppinen, D. Smekens CERN, Geneva, Switzerland
	Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404 FNAL and CERN are developing an 11 T Nb3Sn dipole suitable for installation in the LHC. To optimize coil design parameters and fabrication process and study coil performance, a series of 1 m long dipole coils is being fabricated. One of the short coils has been tested using a dipole mirror structure. This paper describes the dipole mirror magnetic and mechanical designs, and reports coil parameters and test results.
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WEPRI100	Magnetic Design Constraints of Helical Solenoids	2731
	M.L. Lopes, S. Krave, J.C. Tompkins, K. Yonehara Fermilab, Batavia, Illinois, USA G. Flanagan, S.A. Kahn Muons, Inc, Illinois, USA K.E. Melconian Texas A&M University, College Station, Texas, USA
	Helical solenoids have been proposed as an option for a Helical Cooling Channel for muons in a proposed Muon Collider. Helical solenoids can provide the required three main field components: solenoidal, helical dipole, and a helical gradient. In general terms, the last two are a function of many geometric parameters: coil aperture, coil radial and longitudinal dimensions, helix period and orbit radius. In this paper, we present design studies of a Helical Solenoid, addressing the geometric tunability limits and auxiliary correction system.
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WEPRI101	Iron Shims outside the Helium Vessel to Adjust Field Quality at High Fields	2734
	R.C. Gupta, M. Anerella, J.P. Cozzolino, A.K. Jain, J.F. Muratore, P. Wanderer BNL, Upton, Long Island, New York, USA
	Funding: This work is supported by the U.S. Department of Energy under Contract No. DE¬AC02-98CH10886. This paper describes the development and demonstration of a novel technique of adjusting measured field quality at the design field in superconducting magnets. The technique is based on placing iron shims of variable stack thicknesses, variable width and/or variable length on the outer surface of the stainless steel shell at strategic locations. Since the shims are placed outside the helium vessel, adjustments can be made without involving major operations such as opening the helium vessel. It is a simple and economical technique which is suitable for long magnets with a fast turn-around. This allows one to reduce field errors well beyond the normal construction errors. The technique has recently been successfully applied in two 3.8 T, 80 mm aperture, 9.45 m long dipoles. These magnets were built at Brookhaven National Laboratory (BNL) for the APUL project (Accelerator Project to Upgrade the LHC) as a part of US contribution to LHC. The paper will present the design, measurement and adaptation of this technique which, when used in combination with the coil shims, produced near zero sextupole harmonic at high fields and small harmonics throughout the range of operation.
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WEPRI102	Conceptual Magnetic Design of the Large Aperture D2 Dipole for LHC Upgrade	2737
	R.C. Gupta BNL, Upton, Long Island, New York, USA
	Funding: This work is supported by the U.S. Department of Energy under Contract No. DE¬AC02-98CH10886. CERN has proposed the High Luminosity upgrade of the Large Hadron Collider (HL-LHC) as an upgrade to the Large Hadron Collider (LHC). As a part of this proposal, the aperture of twin aperture D2 dipole is increased from the present 80 mm to 10⁵ mm without increasing the size of cryostat. This creates a significant challenge in managing saturation induced harmonics and the leakage field, particularly since the field in the two apertures is in the same direction. In addition, small spacing between the two apertures creates significant cross-talk harmonics as well. The expected harmonics based on an initial design were rather large and limited the beam dynamics performance of the machine. This paper will present a series of conceptual magnetic designs which reduce the values of key harmonics by a large amount with expected field errors now comparable to those in most superconducting accelerator magnets.
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WEPRI103	Magnet Design for a Six-dimensional Rectilinear Cooling Channel - Feasibility Study	2740
	H. Witte, J.S. Berg, R.B. Palmer, D. Stratakis BNL, Upton, Long Island, New York, USA F. Borgnolutti LBNL, Berkeley, California, USA
	Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. An essential part of a potential future muon collider is ionization cooling, which is required to reduce the emittance of the muon beam. A new scheme has recently been proposed which in simulations shows an improved performance in terms of cooling efficiency and transmitted muons. The lattice of this cooling channel consists of 12 stages, each of which requires different superconducting solenoids. The most challenging stage is the last one, where the solenoids are expected to deliver 15.1T in a bore of ~4.5 cm. This paper discusses the feasibility of the solenoids for the last stage of this lattice.
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Paper

Title

Page

Prospects for the use of HTS in High-field Magnets for Future Accelerator Facilities

974

A. Ballarino
CERN, Geneva, Switzerland

The enthusiasm that followed the discovery of High Temperature Superconductors (HTS) and the hope that they could replace Low Temperature Superconductors (LTS) was damped by low current-carrying capacity, short piece lengths, and fragility of the brittle oxide materials. Development of applications was mainly on devices less demanding of conductor performance. However, with continuing development, progress was made with the cuprate superconductors, and long lengths of BSCCO 2223 and REBCO tape conductors are now commercially available. Progress has also been made in the development of BSSCO 2212 round wire, where implementation of a new production process has led to a breakthrough in performance. Though still at the research level, attainments in material synthesis and theoretical understanding of iron-based materials may lead to their development into practical superconductors, featuring high upper critical field and low anisotropy. A review of the potential of HTS as applied to accelerators is presented, with a focus on using the presently available materials and on the perceived needs for further development.

Slides TUZB02 [2.331 MB]

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TUOCB02

High-field Magnet Development toward the High Luminosity LHC

983

G. Apollinari
Fermilab, Batavia, Illinois, USA

The upcoming Luminosity upgrade of the LHC (HL-LHC) will rely on the use of Accelerator Quality Nb3Sn Magnets which have been the focus of an intense R&D effort in the last decade. This contribution will describe the R&D and results of Nb3Sn Accelerator Quality High Field Magnets development efforts, with emphasis on the activities considered for the HL-LHC upgrades.

Slides TUOCB02 [5.103 MB]

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WEPRO045

Design of a System at NSRRC to Measure the Field for an In-vacuum Cryogenic Undulator with Permanent Magnet

2041

C.K. Yang, C.-H. Chang, T.Y. Chung, J.C. Huang, C.-S. Hwang, Y.Y. Lin
NSRRC, Hsinchu, Taiwan

A cryogenic undulator with a permanent magnet (CPMU) is an important insertion device now under construction at NSRRC. For an undulator of this kind, the distribution of the magnetic field must be measured along the axis; the phase error, trajectory and photon flux must be calculated after the magnetic arrays are installed in the vacuum chamber and cooled to cryogenic temperature. We developed a Hall-probe system to measure the magnetic field in an evacuated environment; this system uses lasers and stages to monitor and to correct dynamically the positions of the Hall probe. All components installed inside the vacuum chamber are compatible with an environment of high vacuum and low temperature. The details of the design and completed fabrication are presented in this paper.

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WEPRI083

The SIS100 Superconducting Fast Ramped Dipole Magnet

2681

E.S. Fischer, A. Bleile, J.P. Meier, A. Mierau, P. Schnizer
GSI, Darmstadt, Germany
P.G. Akishin
JINR, Dubna, Moscow Region, Russia

The first dipole magnet of the superconducting SIS100 accelerator was delivered by industry and its thermodynamic, electrical and magnetic field performance was measured. We describe the build of the test facility, the infrastructure and its performance, outline the chosen measurement methods along with the optimisation of the magnet end required for obtaining the requested integral field quality. The measured ac loss parameters will be discussed in respect of the possible operation performance of the whole machine, the relevant cooling conditions of the main dipole magnet.

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WEPRI084

Magnetic Field Optimization of SIS100 Quadrupole Units

2684

K. Sugita, E.S. Fischer, A. Mierau, P. Schnizer
GSI, Darmstadt, Germany
P.G. Akishin
JINR, Dubna, Moscow Region, Russia

Superconducting heavy ion synchrotron SIS100 is the central accelerator of the FAIR accelerator complex. There are more than 10 types of the quadrupole units in SIS100 due to the combination of the quadrupoles from 3 families and several types of the corrector magnets. Magnetic field optimization of the quadrupole magnet ends including evaluation of cross talk between closely attached quadrupole and corrector magnets will be reported.

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WEPRI085

The Elettra 3.5 T Superconducting Wiggler Refurbishment

2687

D. Zangrando, R. Bracco, D. Castronovo, M. Cautero, E. Karantzoulis, S. Krecic, G.L. Loda, D. Millo, L. Pivetta, G. Scalamera, R. Visintini
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
S.V. Khrushchev, N.A. Mezentsev, V.A. Shkaruba, V.M. Syrovatin, O.A. Tarasenko, V.M. Tsukanov, A.A. Volkov
BINP SB RAS, Novosibirsk, Russia

A 3.5 Tesla 64 mm period superconducting wiggler (SCW) was constructed by the Russian Budker Institute of Novosibirsk (BINP) and installed in the Elettra storage ring as a photon source for the second X-ray diffraction beamline in November 2002, but never used due to the lack of the funding required for the beamline construction. About three years ago, the beamline construction was finally funded together with the refurbishment of the SCW. This upgrade, that was necessary in order to make the SCW operations compatible with the top up mode of the storage ring aimed in a drastic reduction of the liquid helium consumption by means of replacing the cryostat with a new version. At the same time the upgrade aimed as well to improve the reliability of the cryostat, to update the control system and to verify the magnetic field performance after a very long time of inactivity. In this paper we present and discuss the performances of the SCW following its refurbishment carried out by BINP team and its re-commissioning in the Elettra storage ring.

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WEPRI086

Three Dimensional Field Analysis for Final Focus Magnet System at SuperKEKB

2690

Y. Arimoto, N. Ohuchi, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan
B. Parker, P. Wanderer
BNL, Upton, Long Island, New York, USA

SuperKEKB is an upgrade accelerator of KEKB with a design luminosity of 8x10³⁵ cm^-2 s^-1. The design is based on a "nano-beam scheme", where vertical beam size is squeezed into 50 nm at an interaction point. One of key component is a final focus magnet system. The focusing system consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. They are aligned in a detector (Belle-II) solenoid which generates a longitudinal field of 1.5 T. The system are packed in a small area and also has magnetic shields. So it is expected an entire magnetic field of the system is not one which is linearly-superimposed field of each magnet. Here a study of three dimensional field analysis for the final focus magnet system will be presented.

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WEPRI087

Magnetic Field Measurement System for the SuperKEKB Final Focus Superconducting Magnets

2693

N. Ohuchi, Y. Arimoto, M. Iwasaki, M.K. Kawai, Y. Kondo, Y. Makida, K. Tsuchiya, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan

SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The magnetic field measurement systems with the vertical cryostats were designed and constructed for performing the acceptance test of these magnets at 4 K. The field measurements are performed by the 6 different harmonic coils and a Hall probe. The higher order multi-pole field distributions along the magnet axes are very important for the beam operation, and then these distributions are measured with the 20 mm long harmonic coils. The integral fields of quadrupole magnets are measured with the 600 mm long harmonic coils. We will describe the magnetic field measurement system.

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WEPRI088

Magnetic Measurement System for the NICA Booster Magnets

2696

V.V. Borisov, A. Donyagin, O. Golubitsky, A. Golunov, N. Gorbunov, H.G. Khodzhibagiyan, N.A. Morozov, S. Rubtsun
JINR, Dubna, Moscow Region, Russia

NICA is a new accelerator collider complex presently under construction at Joint Institute for 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. The first phase of the system for magnetic measurements was commissioned in late 2013. A method of measuring the quality of the magnetic field in the aperture of the curved dipole magnet for the booster synchrotron is described. First results of magnetic measurements are presented and discussed. Commissioning of equipment for magnetic measurements in the aperture of quadrupole magnets for the NICA booster is close to completion.

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WEPRI089

Facility for Assembling and Serial Test of Superconducting Magnets

2700

S.A. Kostromin, N.N. Agapov, V.V. Borisov, A.R. Galimov, V. Karpinsky, H.G. Khodzhibagiyan, V.S. Korolev, D. Nikiforov, N.V. Semin, A.Y. Starikov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

The NICA/MPD project has been started at the Joint Institute for Nuclear Research (JINR) in Dubna in 2007. The NICA accelerator complex will consist of two injector chains, the new 600 MeV/u superconducting (SC) booster synchrotron, the existing SC synchrotron Nuclotron, and the new SC collider having two rings each of 503 m in circumference. The building construction of the new test facility for simultaneous cryogenic testing of the SC magnets on 6 benches is completed at the Laboratory of High Energy Physics. Premises with an area of 2600 m2 were prepared to install the equipment. The 15 kA, 25 V pulse power supply, the helium satellite refrigerator with capacity of 100 W were commissioned first bench for magnets testing is now under assembling. First magnets cryogenic tests are planned on July. Start of the serial production of the SC magnets for the booster synchrotron is planned for the end of 2014.

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WEPRI091

Superconducting Multipole Wigglers: State of the Art

4103

N.A. Mezentsev, S.V. Khrushchev, V.K. Lev, V.A. Shkaruba, V.M. Syrovatin, V.M. Tsukanov
BINP SB RAS, Novosibirsk, Russia

Superconducting multipole wigglers installed on synchrotron radiation sources are the powerful tools for researches in various areas of science and technics. SuperConducting Multipole Wigglers (SCMWs) represent sign-alternating sequence of magnets with lateral magnetic field. Relativistic electrons, passing through such set of magnetic elements, create radiation with properties of synchrotron radiations depending on maximum field its period and poles number. The first superconducting wiggler has been made and installed on the VEPP-3 electron storage ring as generator of synchrotron radiation in 1979. Nowadays tens of wigglers are successfully working in the various synchrotron radiation centers and more than 10 of them were developed and made in Budker INP. These wigglers may be divided into 3 groups: 1- Short period 3-3.5 cm with field ~2-2.5 Tesla 2- Medium period 4.8-6 cm with field ~ 3.5-4.5 Tesla 3- Long period 14.5-20 cm with field 7-7.5Tesla. The description of magnetic properties of the wigglers, parameters of both cryogenic and vacuum systems and their technical decisions are presenteded in the report.

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WEPRI092

Test and Simulation Results for Quenches Induced by Fast Losses on a LHC Quadrupole

2706

C. Bracco, B. Auchmann, W. Bartmann, M. Bednarek, A. Lechner, M. Sapinski, R. Schmidt, N.V. Shetty, M. Solfaroli Camillocci, A.P. Verweij
CERN, Geneva, Switzerland

A test program for beam induced quenches was started in the LHC in 2011 in order to reduce as much as possible BLM-triggered beam dumps, without jeopardizing the safety of the superconducting magnets. A first measurement was performed to assess the quench level of a quadrupole located in the LHC injection region in case of fast (ns) losses. It consisted in dumping single bunches onto an injection protection collimator located right upstream of the quadrupole, varying the bunch intensity up to 3·10¹⁰ protons and ramping the quadrupole current up to 2200 A. No quench was recorded at that time. The test was repeated in 2013 with increased bunch intensity (6·10¹⁰ protons); a quench occurred when powering the magnet at 2500 A. The comparison between measurements during beam induced and quench heaters induced quenches is shown. Results of FLUKA simulations on energy deposition, calculations on quench behaviour using QP3 and the respective estimates of quench levels are also presented.

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WEPRI093

Welding and Quality Control for the Consolidation of the LHC Superconducting Magnets and Circuits

2709

S. Atieh, M. Bernardini, F.F. Bertinelli, P. Cruikshank, J.M. Dalin, G. Favre, V. Kain, D. Lombard, A. Perin, M. Pojer, G. Rasul, D. Rey, R. Rizwan, F. Savary, J.Ph. G. L. Tock
CERN, Geneva, Switzerland

The first LHC long shutdown was driven by the need to consolidate the 13 kA splices between the superconducting magnets to safely attain its center of mass design energy of 14 TeV. Access to the splices requires the opening of welded sleeves by machining. After consolidation, the sleeves are re-welded using a TIG orbital welding. The welding process has been modified from the original “as-new” installation in order to better adapt to the “as repaired” situation. The intervention has been thoroughly prepared through qualifications, organisation of teams, their training and follow-up. Quality control is based on the qualification of equipment, process and operators; the recording of production parameters; regular process audits and production witness samples; visual inspection through an official certifying body. The paper also describes welding and quality control of special intervention cases, with issues of difficult access requiring innovative solutions. This work concerns over 10 000 welds and a team of 40 engineers and technicians over a period of 18 months. The experience and lessons learnt will be applicable to similar large complex projects.

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WEPRI094

Conceptual Design Study of the High Luminosity LHC Recombination Dipole

2712

G.L. Sabbi, X. Wang
LBNL, Berkeley, California, USA
G. Arduini, M. Giovannozzi, E. Todesco
CERN, Geneva, Switzerland

Funding: Work supported by the U.S. DOE LHC Accelerator Research Program. The HiLumi LHC Design Study is partly funded by the European Commission within the Framework Programme 7.
The interaction region design of the High-Luminosity LHC requires replacing the recombination dipole magnets (D2) with new ones. The preliminary specifications include an aperture of 10⁵ mm, with 186 mm separation between the twin-aperture axes, and an operating field in the range of 3.5 to 4.5 T. The main design challenge is to decouple the magnetic field in the two apertures and ensure good field quality. In this paper, we present a new approach to address these issues, and provide expected harmonics for geometric, saturation and persistent current effects. The feasibility of an operating field at the high end of the range considered is also discussed, to minimize the D2 magnet length and facilitate the space allocation for other components.

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WEPRI095

Modelling of a Short-period Superconducting Undulator

2716

B.J.A. Shepherd, J.A. Clarke
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
V. Bayliss, T.W. Bradshaw
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
E.C. Longhi
DLS, Oxfordshire, United Kingdom

STFC, in collaboration with Diamond Light Source, are designing and building a 15.5 mm period, 1.26 T superconducting undulator. This paper describes the modelling of the undulator, using Radia and Opera. Extensive numerical modelling has been carried out to simulate the effect of manufacturing tolerances on the quality of the magnetic field, in order to meet the demanding 3° rms phase error specification.

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WEPRI096

Mu2e Magnetic Measurements

2719

M. Buehler, M.A. Tartaglia, J.C. Tompkins
Fermilab, Batavia, Illinois, USA
C.R. Orozco
University of Illinois at Urbana-Champaign, Illinois, USA

The Mu2e experiment at Fermilab is designed to explore charged lepton flavor violation by searching for muon-to-electron conversion. The magnetic field generated by a system of solenoids is crucial for Mu2e and requires accurate characterization to detect any flaws and to produce a detailed field map. Stringent physics goals are driving magnetic field specifications for the Mu2e solenoids. A field mapper is being designed, which will produce detailed magnetic field maps. The uniform field region of the spectrometer volume requires the highest level of precision (1 Gauss per 1 Tesla). During commissioning, multiple magnetic field maps will be generated to verify proper alignment of all magnet coils, and to create the final magnetic field map. In order to design and build a precise field mapping system consisting of Hall and NRM probes, tolerances and precision for such a system need to be evaluated. In this paper we present a design for the Mu2e field mapping hardware, and discuss results from OPERA-3D simulations to specify parameters for Hall and NMR probes. We also present a fitting procedure for the analytical treatment of our expected magnetic measurements.

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WEPRI097

STATUS OF 11 T 2-IN-1 Nb3Sn DIPOLE DEVELOPMENT FOR LHC

2722

A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, R. Bossert, M. Buehler, G. Chlachidze, J. DiMarco, A. Nobrega, I. Novitski, D. Turrioni, G. Velev
Fermilab, Batavia, Illinois, USA
B. Auchmann, M. Karppinen, L. Rossi, D. Smekens
CERN, Geneva, Switzerland

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404
The LHC upgrade plans foresee installation of additional collimators in the LHC lattice. To provide the necessary longitudinal space for these collimators, shorter and stronger Nb3Sn dipoles compatible with the LHC lattice and main systems could be used. This paper describes the design and status of the twin-aperture Nb3Sn dipole being developed by FNAL and CERN for the LHC, and reports test results of two collared coils to be used in the first 1 m long twin-aperture dipole model.

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WEPRI098

QUENCH PROTECTION STUDIES OF 11T Nb3Sn DIPOLE MODELS FOR LHC UPGRADES

2725

A.V. Zlobin, G. Chlachidze, A. Nobrega, I. Novitski
Fermilab, Batavia, Illinois, USA
M. Karppinen
CERN, Geneva, Switzerland

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
CERN and FNAL are developing 11 T Nb3Sn dipole magnets for the LHC collimation system upgrade. Due to the large stored energy, protection of these magnets during a quench is a challenging problem. This paper reports the results of experimental studies of key quench protection parameters including longitudinal and radial quench propagation in the coil, coil heating due to a quench, and energy extraction and quench-back effect. The studies were performed using a 1 m long 11 T Nb3Sn dipole coil tested in a magnetic mirror configuration.

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WEPRI099

Testing of a Single 11 T Nb3Sn Dipole Coil Using a Dipole Mirror Structure

2728

A.V. Zlobin, N. Andreev, E.Z. Barzi, G. Chlachidze, V.V. Kashikhin, A. Nobrega, I. Novitski, D. Turrioni
Fermilab, Batavia, Illinois, USA
M. Karppinen, D. Smekens
CERN, Geneva, Switzerland

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404
FNAL and CERN are developing an 11 T Nb3Sn dipole suitable for installation in the LHC. To optimize coil design parameters and fabrication process and study coil performance, a series of 1 m long dipole coils is being fabricated. One of the short coils has been tested using a dipole mirror structure. This paper describes the dipole mirror magnetic and mechanical designs, and reports coil parameters and test results.

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WEPRI100

Magnetic Design Constraints of Helical Solenoids

2731

M.L. Lopes, S. Krave, J.C. Tompkins, K. Yonehara
Fermilab, Batavia, Illinois, USA
G. Flanagan, S.A. Kahn
Muons, Inc, Illinois, USA
K.E. Melconian
Texas A&M University, College Station, Texas, USA

Helical solenoids have been proposed as an option for a Helical Cooling Channel for muons in a proposed Muon Collider. Helical solenoids can provide the required three main field components: solenoidal, helical dipole, and a helical gradient. In general terms, the last two are a function of many geometric parameters: coil aperture, coil radial and longitudinal dimensions, helix period and orbit radius. In this paper, we present design studies of a Helical Solenoid, addressing the geometric tunability limits and auxiliary correction system.

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WEPRI101

Iron Shims outside the Helium Vessel to Adjust Field Quality at High Fields

2734

R.C. Gupta, M. Anerella, J.P. Cozzolino, A.K. Jain, J.F. Muratore, P. Wanderer
BNL, Upton, Long Island, New York, USA

Funding: This work is supported by the U.S. Department of Energy under Contract No. DE¬AC02-98CH10886.
This paper describes the development and demonstration of a novel technique of adjusting measured field quality at the design field in superconducting magnets. The technique is based on placing iron shims of variable stack thicknesses, variable width and/or variable length on the outer surface of the stainless steel shell at strategic locations. Since the shims are placed outside the helium vessel, adjustments can be made without involving major operations such as opening the helium vessel. It is a simple and economical technique which is suitable for long magnets with a fast turn-around. This allows one to reduce field errors well beyond the normal construction errors. The technique has recently been successfully applied in two 3.8 T, 80 mm aperture, 9.45 m long dipoles. These magnets were built at Brookhaven National Laboratory (BNL) for the APUL project (Accelerator Project to Upgrade the LHC) as a part of US contribution to LHC. The paper will present the design, measurement and adaptation of this technique which, when used in combination with the coil shims, produced near zero sextupole harmonic at high fields and small harmonics throughout the range of operation.

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WEPRI102

Conceptual Magnetic Design of the Large Aperture D2 Dipole for LHC Upgrade

2737

R.C. Gupta
BNL, Upton, Long Island, New York, USA

Funding: This work is supported by the U.S. Department of Energy under Contract No. DE¬AC02-98CH10886.
CERN has proposed the High Luminosity upgrade of the Large Hadron Collider (HL-LHC) as an upgrade to the Large Hadron Collider (LHC). As a part of this proposal, the aperture of twin aperture D2 dipole is increased from the present 80 mm to 10⁵ mm without increasing the size of cryostat. This creates a significant challenge in managing saturation induced harmonics and the leakage field, particularly since the field in the two apertures is in the same direction. In addition, small spacing between the two apertures creates significant cross-talk harmonics as well. The expected harmonics based on an initial design were rather large and limited the beam dynamics performance of the machine. This paper will present a series of conceptual magnetic designs which reduce the values of key harmonics by a large amount with expected field errors now comparable to those in most superconducting accelerator magnets.

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WEPRI103

Magnet Design for a Six-dimensional Rectilinear Cooling Channel - Feasibility Study

2740

H. Witte, J.S. Berg, R.B. Palmer, D. Stratakis
BNL, Upton, Long Island, New York, USA
F. Borgnolutti
LBNL, Berkeley, California, USA

Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
An essential part of a potential future muon collider is ionization cooling, which is required to reduce the emittance of the muon beam. A new scheme has recently been proposed which in simulations shows an improved performance in terms of cooling efficiency and transmitted muons. The lattice of this cooling channel consists of 12 stages, each of which requires different superconducting solenoids. The most challenging stage is the last one, where the solenoids are expected to deliver 15.1T in a bore of ~4.5 cm. This paper discusses the feasibility of the solenoids for the last stage of this lattice.

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