IPAC2016 - Classification: 07 Accelerator Technology / T10 Superconducting Magnets

Paper	Title	Page
TUPMB031	From Design Towards Series - The Superconducting Magnets for FAIR	1167
	E.S. Fischer, A. Bleile, V.I. Datskov, J.P. Meier, A. Mierau, H. Müller, C. Roux, P. Schnizer, K. Sugita GSI, Darmstadt, Germany
	The Facility for Anti-proton and Ion Research (FAIR-project) is now under construction. The heavy ion synchrotron SIS100 and the Super Fragment Separator (Super-FRS) use mainly superferric magnets as beam guiding elements. We present the design status of the magnets next to the experience obtained on the first magnets which were produced for SIS100. Finally we give an overview of the preparation for the series production and testing of the cryomagnetic modules.
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TUPMB032	Magnetic Field Characterisation of the First Series Dipole Magnet for the SIS100 Accelerator of FAIR	1171
	F. Kaether, E.S. Fischer, V. Marusov, A. Mierau, C. Roux, P. Schnizer, K. Sugita, H.G. Weiss GSI, Darmstadt, Germany
	The procurement of the SIS100 dipoles was contracted without building and testing an appropriate model magnet. So the thorough test of the first of series magnet is the key issue for the final realisation of the complete series production. The core of these tests is the measurement and analysis of the magnetic field of the first dipole. We describe the adapted measurement technics next to a detailed analysis of the obtained field quality and point out the critical issues of the series production
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TUPMB033	Design and Construction of the QC2 Superconducting Magnets in the SuperKEKB IR	1174
	N. Ohuchi, Y. Arimoto, N. Higashi, M. Iwasaki, M.K. Kawai, Y. Kondo, K. Tsuchiya, X. Wang, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan H.K. Kono, T. Murai, S. Takagi Mitsubishi Electric Corp., Energy Systems Centre, Kobe, Japan
	SuperKEKB is now being constructed with a target luminosity of 8×10³⁵ which is 40 times higher than the KEKB luminosity. The luminosity can be achieved by the "Nano-Beam" accelerator 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 QC2 magnets are designed to be located in the second closest position from IP as the final beam focusing system of SuperKEKB. The two types of quadrupole magnets have been designed for the electron and positron beam lines. The QC2P for the positron beam is designed to generate the field gradient, G, of 28.1 T/m and the effective magnetic length, L, of 0.4099 m at the current, I, of 877.4 A. The QC2E for the electron beam line is designed to generate G=28.44 T/m and L=0.537 mm, 0.419 mm (for QC2LE, QC2RE) at I=977 A. In the paper, we will present the designs and the constructions of the two types of the quadrupole magnets.
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TUPMB034	Design and Manufacture of a Superconducting Solenoid for D-Line of J-PARC Muon Facility	1177
	T. Semba, Y. Hagiwara, S. Kido, S. Nakajima, Y. Tanaka Hitachi Ltd., Ibaraki-ken, Japan N. Kawamura, Y. Makida, Y. Miyake, H. Ohhata, K. Sasaki, K. Shimomura KEK, Ibaraki, Japan N. Kurosawa KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan Y. Murata Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi, Japan P. Strasser High Energy Accelerator Research Organization (KEK), Institute of Materials Structure Science (IMSS), Ibaraki, Japan
	A superconducting solenoid for J-PARC muon facility was newly designed and manufactured. High Energy Accelerator Research Organization (KEK) has been operating the J-PARC Muon Science Establishment (MUSE) since 2008. Among its four muon beam lines, the decay muon line (D-Line) has been extracting and providing surface muons and positive decay muons up to a momentum of 50 MeV/c for various users, utilizing a superconducting solenoid. The D-Line as well as the other J-PARC facility suffered severe damages from the earthquake on March 11, 2011. It necessitated rebuilding of the damaged superconducting solenoid. New design parameter of the solenoid is as follows: length of solenoid: 6 m, diameter of warm bore: 0.2 m, magnetic field of bore center: 3.5 T, rated current: 415 A, superconducting wire: NbTi/Cu, quench protection: quench back heaters. The six-meter-long solenoid consists of twelve pieces of 0.5-meter-long superconducting coils. The entire solenoid is forced-indirectly cooled by supercritical helium flow. This report describes the design and manufacturing process of the newly built superconducting solenoid for D-Line of J-PARC muon facility.
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TUPMB035	Developments of HTS Magnets towards Application to Accelerators	1180
	K. Hatanaka, M. Fukuda, K. Kamakura, H. Ueda, Y. Yasuda, T. Yorita RCNP, Osaka, Japan
	We have been developing magnets utilizing first generation HTS wire for this decade. HTS materials have advantages over LTS materials. Magnets can be operated at 20 K or higher temperature and the cooling structure becomes simpler. Owing to a large margin in operating temperature, it is possible to excite HTS magnets by AC or pulsed currents without quenching. After successful performance tests of proto type models, two magnets have been fabricated for practical use. A cylindrical magnet generates a magnetic field higher than 3.5 T at the center to polarized 210 neV neutrons. A dipole magnet is excited by pulse currents in order to deliver accelerated beams to two target stations by time sharing. Their design and operational performance are discussed.
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TUPMB037	Instruments and Methods for the Magnetic Measurement of the Super-FRS Magnets	1183
	G. Golluccio, M.C.L. Buzio, D. Caltabiano, G. Deferne, O. Dunkel, L. Fiscarelli, D. Giloteaux, C. Petrone, S. Russenschuck CERN, Geneva, Switzerland P. Schnizer GSI, Darmstadt, Germany
	The Super-FRS is a new fragment separator to be built as part of the Facility for Antiproton and Ion Research (FAIR) [\ref{fair_web}] at Darmstadt. The acceptance tests and magnetic measurements of the superferric separation dipoles and multiplets (containing quadrupole and higher-order magnets) will be performed at CERN in collaboration with GSI/FAIR [\ref{abstract_facility}]. This paper presents the methods and challenges of the magnetic field measurements, and the required instruments for measuring the transfer function, field quality, and magnetic axis. A prototype for each system has been produced in order to validate the measurement methods, the instruments, and the mechanical integration. In this paper will present the design and production of the prototypes, the design of the instruments for the series measurements, and the results of the metrological characterization.
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TUPMB038	Degradation of the Insulation of the LHC Main Dipole Cable when Exposed to High Temperatures	1186
	V. Raginel, B. Auchmann, D. Kleiven, R. Schmidt, A.P. Verweij, D. Wollmann CERN, Geneva, Switzerland
	Funding: Research supported by the High Luminosity LHC project The energy stored in the LHC beams is substantial and requires a complex machine protection system to protect the equipment. Despite efficient beam absorbers, several failure modes lead to some limited beam impact on superconducting magnets. Thus it is required to understand the damage mechanisms and limits of superconducting magnets due to instantaneous beam impact. This becomes even more important due to the future upgrade of CERNs injector chain for the LHC that will lead to an increase of the beam brightness. A roadmap to perform damage tests on magnet parts has been presented previously. The polyimide insulation of the superconducting cable is identified as one of the critical elements of the magnet. In this contribution, the experimental setup to measure the insulation degradation of LHC main dipole cables due to exposure to high temperature is described. Compressed stacks of insulated Nb-Ti cables have been exposed to a heat treatment within an Argon atmosphere. After each heat treatment, high-voltage measurements verified the dielectric strength of the insulation. The results of this experiment provide an upper damage limit of superconducting magnets due to beam impact. Experimental Setups to Determine the Damage Limit of Superconducting Magnets for Instantaneous Beam Losses, V. Raginel et al, IPAC'15
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TUPMB041	The SuperKEKB Interaction Region Corrector Magnets	1193
	B. Parker, M. Anerella, J. Escallier, A.K. Ghosh, A.K. Jain, A. Marone, P. Wanderer BNL, Upton, Long Island, New York, USA Y. Arimoto, N. Higashi, M. Iwasaki, N. Ohuchi, K. Tsuchiya, X. Wang, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan
	Work for the SuperKEKB luminosity upgrade of the KEKB asymmetric e⁺e⁻ collider is near completion. In this paper we review the design, production and testing of superconducting correction coils, that are needed to achieve the desired IR optics performance, and are integrated with the final focus magnets. For SuperKEKB 43 coils were produced at BNL using Direct Wind techniques. These coils underwent preliminary warm field harmonic quality assurance measurements before shipment to KEK. At KEK final cold measurements of these coils were made prior to their ultimate integration with the SuperKEKB IR magnets. SuperKEKB corrector production was challenging due to the large number of coil types and configurations that had to be fitted into very limited available space. Also the nature of the SuperKEKB optics sets fairly stringent local field quality requirements for these coils.
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TUPMB042	Sweet Spot Designs for Interaction Region Septum Magnets	1196
	B. Parker BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy. A fundamental consideration in designing a high energy collider Interaction Region with electron beams is to avoid production of excessive experimental detector background due to synchrotron radiation. Circumventing such radiation is especially problematic with colliding beams having quite different magnetic rigidities as occurs in both electron-hadron and asymmetric-momentum electron colliders where one must shield an incoming electron beam from the strong magnetic fields needed to focus the other beam. After reviewing some magnetic configurations used to date, we introduce a new 'sweet spot' coil concept that was invented for the eRHIC project proposed at BNL. Sweet spot coils have conductors arranged so that there is an open, low field strength path through the main high field superconducting coil structure. Sweet spot configurations tend to be more efficient than other active and passive shielding solutions. Dipole and quadrupole sweet spot magnet designs examples are presented in this paper along with ongoing R&D to implement and test these concepts.
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TUPMB051	Commisioning of Facility for Assembling and Tests of Superconducting Magnets	1215
	S.A. Kostromin, V.V. Borisov, A.M. Donyagin, A.R. Galimov, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Korovkin, G.L. Kuznetsov, D. Nikiforov, A.Y. Starikov, A. Tikhomirov JINR, Dubna, Moscow Region, Russia A.V. Kudashkin, T.E. Serochkina, A.V. Shemchuk JINR/VBLHEP, Dubna, Moscow region, Russia
	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, equipment for magnets assembly and tests are installed. Three helium satellite refrigerators with each capacity of 100 W were commissioned 2 of 6 test benches for magnets testing are assembled and commissioned. NICA booster magnets fist cryogenic tests are done. The results are discussed.
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Paper

Title

Page

From Design Towards Series - The Superconducting Magnets for FAIR

1167

E.S. Fischer, A. Bleile, V.I. Datskov, J.P. Meier, A. Mierau, H. Müller, C. Roux, P. Schnizer, K. Sugita
GSI, Darmstadt, Germany

The Facility for Anti-proton and Ion Research (FAIR-project) is now under construction. The heavy ion synchrotron SIS100 and the Super Fragment Separator (Super-FRS) use mainly superferric magnets as beam guiding elements. We present the design status of the magnets next to the experience obtained on the first magnets which were produced for SIS100. Finally we give an overview of the preparation for the series production and testing of the cryomagnetic modules.

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TUPMB032

Magnetic Field Characterisation of the First Series Dipole Magnet for the SIS100 Accelerator of FAIR

1171

F. Kaether, E.S. Fischer, V. Marusov, A. Mierau, C. Roux, P. Schnizer, K. Sugita, H.G. Weiss
GSI, Darmstadt, Germany

The procurement of the SIS100 dipoles was contracted without building and testing an appropriate model magnet. So the thorough test of the first of series magnet is the key issue for the final realisation of the complete series production. The core of these tests is the measurement and analysis of the magnetic field of the first dipole. We describe the adapted measurement technics next to a detailed analysis of the obtained field quality and point out the critical issues of the series production

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TUPMB033

Design and Construction of the QC2 Superconducting Magnets in the SuperKEKB IR

1174

N. Ohuchi, Y. Arimoto, N. Higashi, M. Iwasaki, M.K. Kawai, Y. Kondo, K. Tsuchiya, X. Wang, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan
H.K. Kono, T. Murai, S. Takagi
Mitsubishi Electric Corp., Energy Systems Centre, Kobe, Japan

SuperKEKB is now being constructed with a target luminosity of 8×10³⁵ which is 40 times higher than the KEKB luminosity. The luminosity can be achieved by the "Nano-Beam" accelerator 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 QC2 magnets are designed to be located in the second closest position from IP as the final beam focusing system of SuperKEKB. The two types of quadrupole magnets have been designed for the electron and positron beam lines. The QC2P for the positron beam is designed to generate the field gradient, G, of 28.1 T/m and the effective magnetic length, L, of 0.4099 m at the current, I, of 877.4 A. The QC2E for the electron beam line is designed to generate G=28.44 T/m and L=0.537 mm, 0.419 mm (for QC2LE, QC2RE) at I=977 A. In the paper, we will present the designs and the constructions of the two types of the quadrupole magnets.

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TUPMB034

Design and Manufacture of a Superconducting Solenoid for D-Line of J-PARC Muon Facility

1177

T. Semba, Y. Hagiwara, S. Kido, S. Nakajima, Y. Tanaka
Hitachi Ltd., Ibaraki-ken, Japan
N. Kawamura, Y. Makida, Y. Miyake, H. Ohhata, K. Sasaki, K. Shimomura
KEK, Ibaraki, Japan
N. Kurosawa
KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
Y. Murata
Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi, Japan
P. Strasser
High Energy Accelerator Research Organization (KEK), Institute of Materials Structure Science (IMSS), Ibaraki, Japan

A superconducting solenoid for J-PARC muon facility was newly designed and manufactured. High Energy Accelerator Research Organization (KEK) has been operating the J-PARC Muon Science Establishment (MUSE) since 2008. Among its four muon beam lines, the decay muon line (D-Line) has been extracting and providing surface muons and positive decay muons up to a momentum of 50 MeV/c for various users, utilizing a superconducting solenoid. The D-Line as well as the other J-PARC facility suffered severe damages from the earthquake on March 11, 2011. It necessitated rebuilding of the damaged superconducting solenoid. New design parameter of the solenoid is as follows: length of solenoid: 6 m, diameter of warm bore: 0.2 m, magnetic field of bore center: 3.5 T, rated current: 415 A, superconducting wire: NbTi/Cu, quench protection: quench back heaters. The six-meter-long solenoid consists of twelve pieces of 0.5-meter-long superconducting coils. The entire solenoid is forced-indirectly cooled by supercritical helium flow. This report describes the design and manufacturing process of the newly built superconducting solenoid for D-Line of J-PARC muon facility.

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TUPMB035

Developments of HTS Magnets towards Application to Accelerators

1180

K. Hatanaka, M. Fukuda, K. Kamakura, H. Ueda, Y. Yasuda, T. Yorita
RCNP, Osaka, Japan

We have been developing magnets utilizing first generation HTS wire for this decade. HTS materials have advantages over LTS materials. Magnets can be operated at 20 K or higher temperature and the cooling structure becomes simpler. Owing to a large margin in operating temperature, it is possible to excite HTS magnets by AC or pulsed currents without quenching. After successful performance tests of proto type models, two magnets have been fabricated for practical use. A cylindrical magnet generates a magnetic field higher than 3.5 T at the center to polarized 210 neV neutrons. A dipole magnet is excited by pulse currents in order to deliver accelerated beams to two target stations by time sharing. Their design and operational performance are discussed.

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TUPMB037

Instruments and Methods for the Magnetic Measurement of the Super-FRS Magnets

1183

G. Golluccio, M.C.L. Buzio, D. Caltabiano, G. Deferne, O. Dunkel, L. Fiscarelli, D. Giloteaux, C. Petrone, S. Russenschuck
CERN, Geneva, Switzerland
P. Schnizer
GSI, Darmstadt, Germany

The Super-FRS is a new fragment separator to be built as part of the Facility for Antiproton and Ion Research (FAIR) [\ref{fair_web}] at Darmstadt. The acceptance tests and magnetic measurements of the superferric separation dipoles and multiplets (containing quadrupole and higher-order magnets) will be performed at CERN in collaboration with GSI/FAIR [\ref{abstract_facility}]. This paper presents the methods and challenges of the magnetic field measurements, and the required instruments for measuring the transfer function, field quality, and magnetic axis. A prototype for each system has been produced in order to validate the measurement methods, the instruments, and the mechanical integration. In this paper will present the design and production of the prototypes, the design of the instruments for the series measurements, and the results of the metrological characterization.

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TUPMB038

Degradation of the Insulation of the LHC Main Dipole Cable when Exposed to High Temperatures

1186

V. Raginel, B. Auchmann, D. Kleiven, R. Schmidt, A.P. Verweij, D. Wollmann
CERN, Geneva, Switzerland

Funding: Research supported by the High Luminosity LHC project
The energy stored in the LHC beams is substantial and requires a complex machine protection system to protect the equipment. Despite efficient beam absorbers, several failure modes lead to some limited beam impact on superconducting magnets. Thus it is required to understand the damage mechanisms and limits of superconducting magnets due to instantaneous beam impact. This becomes even more important due to the future upgrade of CERNs injector chain for the LHC that will lead to an increase of the beam brightness. A roadmap to perform damage tests on magnet parts has been presented previously*. The polyimide insulation of the superconducting cable is identified as one of the critical elements of the magnet. In this contribution, the experimental setup to measure the insulation degradation of LHC main dipole cables due to exposure to high temperature is described. Compressed stacks of insulated Nb-Ti cables have been exposed to a heat treatment within an Argon atmosphere. After each heat treatment, high-voltage measurements verified the dielectric strength of the insulation. The results of this experiment provide an upper damage limit of superconducting magnets due to beam impact.
* Experimental Setups to Determine the Damage Limit of Superconducting Magnets for Instantaneous Beam Losses, V. Raginel et al, IPAC'15

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TUPMB041

The SuperKEKB Interaction Region Corrector Magnets

1193

B. Parker, M. Anerella, J. Escallier, A.K. Ghosh, A.K. Jain, A. Marone, P. Wanderer
BNL, Upton, Long Island, New York, USA
Y. Arimoto, N. Higashi, M. Iwasaki, N. Ohuchi, K. Tsuchiya, X. Wang, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan

Work for the SuperKEKB luminosity upgrade of the KEKB asymmetric e⁺e⁻ collider is near completion. In this paper we review the design, production and testing of superconducting correction coils, that are needed to achieve the desired IR optics performance, and are integrated with the final focus magnets. For SuperKEKB 43 coils were produced at BNL using Direct Wind techniques. These coils underwent preliminary warm field harmonic quality assurance measurements before shipment to KEK. At KEK final cold measurements of these coils were made prior to their ultimate integration with the SuperKEKB IR magnets. SuperKEKB corrector production was challenging due to the large number of coil types and configurations that had to be fitted into very limited available space. Also the nature of the SuperKEKB optics sets fairly stringent local field quality requirements for these coils.

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TUPMB042

Sweet Spot Designs for Interaction Region Septum Magnets

1196

B. Parker
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
A fundamental consideration in designing a high energy collider Interaction Region with electron beams is to avoid production of excessive experimental detector background due to synchrotron radiation. Circumventing such radiation is especially problematic with colliding beams having quite different magnetic rigidities as occurs in both electron-hadron and asymmetric-momentum electron colliders where one must shield an incoming electron beam from the strong magnetic fields needed to focus the other beam. After reviewing some magnetic configurations used to date, we introduce a new 'sweet spot' coil concept that was invented for the eRHIC project proposed at BNL. Sweet spot coils have conductors arranged so that there is an open, low field strength path through the main high field superconducting coil structure. Sweet spot configurations tend to be more efficient than other active and passive shielding solutions. Dipole and quadrupole sweet spot magnet designs examples are presented in this paper along with ongoing R&D to implement and test these concepts.

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TUPMB051

Commisioning of Facility for Assembling and Tests of Superconducting Magnets

1215

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

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, equipment for magnets assembly and tests are installed. Three helium satellite refrigerators with each capacity of 100 W were commissioned 2 of 6 test benches for magnets testing are assembled and commissioned. NICA booster magnets fist cryogenic tests are done. The results are discussed.

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