IPAC2012 - List of Keywords (permanent-magnet)

Paper	Title	Other Keywords	Page
MOPPP066	Calculated Spectra from Magnetic Field Measurements of 1.5 m Superconducting Undulator Coils	undulator, emittance, vacuum, storage-ring	711
	S. Casalbuoni, T. Baumbach, S. Gerstl, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany C. Boffo, W. Walter BNG, Würzburg, Germany
	In this contribution we report on the spectra calculated from the field measurements performed in a liquid helium bath of 1.5 m superconducting undulator coils. The coils are foreseen for a superconducting undulator demonstrator with a period length of 15 mm planned to be installed in ANKA middle 2012 and tested at the new beamline NANO for high resolution X-ray diffraction. The spectral performance at ANKA and at low emittance sources is compared with the competing cryogenic permanent magnet technology.

MOPPP075	The Research on Magnetic Properties of Magnet for SSRF Cryogenic Permanent Magnet Undulator	cryogenics, undulator, radiation, synchrotron	735
	Y.Z. He, L. Wang, Q.G. Zhou SINAP, Shanghai, People's Republic of China
	The temperature coefficient of Br and Hci of Nd2Fe14B and Pr2Fe14B permanent magnet are about -0.1 K-1 and -0.6 K-1 respectively, the higher Br and Hci can be obtained at low temperature. By this theory, a cryogenic permanent magnet undulator(CPMU) may be designed, the maximum magnetic field and the Hci of permanent magnet increased 10-50% and 300-500% respectively, compared with the conventional undulators, the higher brightness X-rays and the more resistance to radiation of undulators can be obtained. The Pr2Fe14B permanent magnet has better potential magnetic properties than the Nd2Fe14B permanent magnet at low temperature for having no spin reorientation phenomenon. The permanent magnets are key “heart” magnetic components for cryogenic permanent magnet undulator, since January 2012, the research plan on magnetic properties of domestic permanent magnet for SSRF cryogenic permanent magnet undulator at low temperature by the support of Shanghai and Nation Nature science funds be started, the paper introduced research status of the item.

MOPPP089	Development of a PrFeB Cryogenic Undulator at NSLS-II	undulator, cryogenics, vacuum, synchrotron	762
	C.A. Kitegi, P. Cappadoro, O.V. Chubar, T.M. Corwin, H.C. Fernandes, D.A. Harder, P. He, G. Rakowsky, J. Rank, C. Rhein, T. Tanabe BNL, Upton, Long Island, New York, USA
	Recent cryogenic undulators use Praseodymium-Iron-Boron (PrFeB) magnets cooled down to 80K. The main drawn drawback of the PrFeB magnet grades developed so far are their relative low coercive field at ambient temperature, below 2 T which prevents PrFeB based cryogenic undulator from baking. Some precautions are required during the undulator assembling and shimming to ensure ultra high vacuum compatibility. However Hitachi Metal Industry (HMI) recently developed two different grades of PrFeB magnet with large coercive field but at the expense of the remanent field. The magnetization curves have been measured from 40 K up to 400 K to determine the field increase and to investigate the magnet withstanding to baking. An IVU prototype has also been baked. Magnetic measurements before and after baking are also presented.

WEPPP015	Generation and Characterization of 5-micron Electron Beam for Probing Optical Scale Structures	electron, diagnostics, quadrupole, target	2753
	M.G. Fedurin, M. Babzien, V. Yakimenko BNL, Upton, Long Island, New York, USA B.A. Allen USC, Los Angeles, California, USA P. Muggli MPI, Muenchen, Germany A.Y. Murokh RadiaBeam, Santa Monica, USA
	In recent years advanced acceleration technologies have progress toward combination of electron beam, laser and optical scale dielectric structures. In present paper described generation of the electron beam probe with parameters satisfied to perform test of such optical structures.

THPPC055	Permanent Magnet Focusing System for Klystrons	klystron, cathode, focusing, electron	3413
	Y. Fuwa, Y. Iwashita, H. Tongu, S. Ushijima Kyoto ICR, Uji, Kyoto, Japan S. Fukuda KEK, Ibaraki, Japan
	The Distributed RF System (DRFS) for ILC requires thousands of klystrons. The failure rate of the power supply for solenoid focusing coil of each klystron may be harmful to a regular operation of the ILC. In order to eliminate the power supplies and the cooling system for the coils, a permanent magnet beam focusing system is under development. It will help to reduce the power consumption as well. In our design, a unidirectional magnetic field configuration is adopted to eliminate the stop bands that arise from the periodic permanent magnet configuration. Since the required magnetic field is not high in this case, inexpensive anisotropic ferrite magnets can be used instead of magnets containing rare earth materials. On the basis of a half scaled model fabricated to evaluate the mechanical design, a full scaled model will be ready soon. In order to prove its feasibility, a power test of the klystron for DRFS with this magnet system is planned. The result of magnetic field distribution measurement and the power test will be presented.

THPPD001	Stretched-wire Measurements of Small Bore Multipole Magnets	multipole, quadrupole, simulation, alignment	3500
	G. Lebec, J. Chavanne, C. Penel ESRF, Grenoble, France
	Stretched-wire (SW) measurements of magnetic multipoles have been performed at radii ranging from 0.5 mm to 4 mm, with an accuracy of 10^-3 of the main multipole component. Theoretical aspects of SW measurements were investigated. The processing of the measured signals is based on a least square approach, instead of the Fourier transform widely used for rotating coil measurements. It allows correcting numerically the position errors of the SW and designing SW trajectory which are not sensitive to the main multipole, as with “bucked” rotating coils. This SW measurement bench was developed for the characterization of new ESRF magnets. It has been tested first with large aperture multipole magnets. An accuracy of 10^-4 has been obtained for a measurement radius of 30 mm. There is a demand in the magnetic measurement community for measuring small bore multipole magnets, with radius smaller than 5 mm. A small permanent magnet quadrupole was built in order to test the bench at small measurement radii.

THPPD009	Accelerator Magnets R&D Programme at CERN	dipole, quadrupole, linac, luminosity	3512
	D. Tommasini, L. Bottura, G. De Rijk, L. Rossi CERN, Geneva, Switzerland
	The exploitation and evolution of the CERN accelerator complex pose a continuous challenge for magnet engineers. Superconducting and resistive magnets have a comparable share. The overall mass of either is approximately 50,000 tons, spread over 3 major machines (PS, SPS and LHC), two large experimental area, and a number of smaller experiments and accelerator rings. On the short term (2012-2014) the CERN plan is to upgrade its injection chain (Linac4) and experimental area (HIE-Isolde, ELENA) that require mostly a multitude of resistive magnets. The medium-term plan for the evolution of the LHC complex (2015-2021), also referred to as High-Luminosity LHC, foresees interventions on about 1 km of the machine, with magnets to be substituted with higher field, larger aperture, or both. On the long term (2025-2035) we are exploring the technological challenges of very high field magnets, at the verge of 20 T for a High Energy LHC (HE-LHC), or extremely stable high gradient quadrupoles for the Compact Linear Collider (CLIC). In this paper we provide an overview of the R&D activities addressing the various lines of development, the technology milestones, and a broad time schedule.

THPPD010	Design, Assembly and First Measurements of a Short Model for CLIC Final Focus Hybrid Quadrupole QD0	quadrupole, multipole, magnet-design, lattice	3515
	M. Modena, O. Dunkel, J.G. Perez, C. Petrone, P.A. Thonet, D. Tommasini CERN, Geneva, Switzerland E. Solodko, A.S. Vorozhtsov JINR, Dubna, Moscow Region, Russia
	In the framework of the Compact Linear Collider (CLIC) R&D, a tunable hybrid magnet design has been proposed for the final focus QD0 quadrupole. A short model of the magnet has been realized in order to validate the novel design and its expected performances. In order to achieve extremely high quadrupole gradients (>500 T/m), the magnet design combines: a core structure made in magnetic CoFe alloy “Permendur”, permanent magnet blocks, and air-cooled electromagnetic coils. Relevant aspects of this design are the wide tunability of the gradient range, the compactness and the absence of any vibrations. In this paper a reminder of the magnet design concept is given; then, the procurement and assembly main aspects are presented, followed by the results of the magnetic measurements. Finally, some manufacturing considerations relative to a full size magnet procurement are discussed.

THPPD016	Construction and Measurement of Novel Adjustable Permanent Magnet Quadrupoles for CLIC	quadrupole, multipole, collider, linear-collider	3530
	B.J.A. Shepherd, J.A. Clarke STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom N.A. Collomb STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The CLIC drive beam decelerator requires 41,848 quadrupoles along its 42km length. In response to concerns over the heat load and operating costs of electromagnet systems, ASTeC in collaboration with CERN is developing adjustable permanent magnet-based quadrupoles. This novel design concept uses moving permanent magnets to adjust the quadrupole strength over a wide operating range. The design has focused not just on achieving the field strength and quality required but has also tried to make the design well suited to mass production, as the CLIC project requires 50 magnets to be completed every day for three years. Two permanent magnet quadrupole families have been designed, for the low and high energy ends of the decelerator respectively. We present the current status of the project, including construction and magnetic measurements of the first prototype.

THPPD033	Using Permanent Magnets to Boost the Dipole Field for the High-energy LHC	dipole, cryogenics, background, radiation	3578
	F. Zimmermann CERN, Geneva, Switzerland Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan
	Funding: Work supported by the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no. 227579. The High-Energy LHC (HE-LHC) will be a new accelerator in the LHC tunnel based on novel dipole magnets, with a field up to 20 T, which are proposed to be realized by a hybrid-coil design, comprising blocks made from Nb-Ti, Nb3Sn and HTS, respectively. Without the HTS the field would be only 15 T. In this note we propose and study the possibility of replacing the inner HTS layer by (weaker) permanent magnets that might contribute a field of 1-2 T, so that the final field would reach 16-17 T. Advantages would be the lower price of permanent magnets compared with HTS magnets and their availability.

FRXAB01	Symplectic Tracking and Compensation of Dynamic Field Integrals in Complex Undulator Structures	undulator, simulation, polarization, dipole	4165
	J. Bahrdt, G. Wüstefeld HZB, Berlin, Germany
	This presentation covers analytical models that describe the interaction of an electron beam with the magnetic field of undulators. Analytic approximations to the Hamilton-Jacobi equation yield generating functions useful for particle tracking and therefore efficient simulation. Analytic expressions for kick maps of APPLE II undulators are presented as well. Passive and active shimming schemes including magic fingers and current sheets are also modeled. Applications at BESSY II are discussed which ensure efficient injection during top-up to satisfy machine protection and radiation safety requirements.
	Slides FRXAB01 [1.922 MB]

Paper

Title

Other Keywords

Page

MOPPP066

Calculated Spectra from Magnetic Field Measurements of 1.5 m Superconducting Undulator Coils

undulator, emittance, vacuum, storage-ring

711

S. Casalbuoni, T. Baumbach, S. Gerstl, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
C. Boffo, W. Walter
BNG, Würzburg, Germany

In this contribution we report on the spectra calculated from the field measurements performed in a liquid helium bath of 1.5 m superconducting undulator coils. The coils are foreseen for a superconducting undulator demonstrator with a period length of 15 mm planned to be installed in ANKA middle 2012 and tested at the new beamline NANO for high resolution X-ray diffraction. The spectral performance at ANKA and at low emittance sources is compared with the competing cryogenic permanent magnet technology.

MOPPP075

The Research on Magnetic Properties of Magnet for SSRF Cryogenic Permanent Magnet Undulator

cryogenics, undulator, radiation, synchrotron

735

Y.Z. He, L. Wang, Q.G. Zhou
SINAP, Shanghai, People's Republic of China

The temperature coefficient of Br and Hci of Nd2Fe14B and Pr2Fe14B permanent magnet are about -0.1 K-1 and -0.6 K-1 respectively, the higher Br and Hci can be obtained at low temperature. By this theory, a cryogenic permanent magnet undulator(CPMU) may be designed, the maximum magnetic field and the Hci of permanent magnet increased 10-50% and 300-500% respectively, compared with the conventional undulators, the higher brightness X-rays and the more resistance to radiation of undulators can be obtained. The Pr2Fe14B permanent magnet has better potential magnetic properties than the Nd2Fe14B permanent magnet at low temperature for having no spin reorientation phenomenon. The permanent magnets are key “heart” magnetic components for cryogenic permanent magnet undulator, since January 2012, the research plan on magnetic properties of domestic permanent magnet for SSRF cryogenic permanent magnet undulator at low temperature by the support of Shanghai and Nation Nature science funds be started, the paper introduced research status of the item.

MOPPP089

Development of a PrFeB Cryogenic Undulator at NSLS-II

undulator, cryogenics, vacuum, synchrotron

762

C.A. Kitegi, P. Cappadoro, O.V. Chubar, T.M. Corwin, H.C. Fernandes, D.A. Harder, P. He, G. Rakowsky, J. Rank, C. Rhein, T. Tanabe
BNL, Upton, Long Island, New York, USA

Recent cryogenic undulators use Praseodymium-Iron-Boron (PrFeB) magnets cooled down to 80K. The main drawn drawback of the PrFeB magnet grades developed so far are their relative low coercive field at ambient temperature, below 2 T which prevents PrFeB based cryogenic undulator from baking. Some precautions are required during the undulator assembling and shimming to ensure ultra high vacuum compatibility. However Hitachi Metal Industry (HMI) recently developed two different grades of PrFeB magnet with large coercive field but at the expense of the remanent field. The magnetization curves have been measured from 40 K up to 400 K to determine the field increase and to investigate the magnet withstanding to baking. An IVU prototype has also been baked. Magnetic measurements before and after baking are also presented.

WEPPP015

Generation and Characterization of 5-micron Electron Beam for Probing Optical Scale Structures

electron, diagnostics, quadrupole, target

2753

M.G. Fedurin, M. Babzien, V. Yakimenko
BNL, Upton, Long Island, New York, USA
B.A. Allen
USC, Los Angeles, California, USA
P. Muggli
MPI, Muenchen, Germany
A.Y. Murokh
RadiaBeam, Santa Monica, USA

In recent years advanced acceleration technologies have progress toward combination of electron beam, laser and optical scale dielectric structures. In present paper described generation of the electron beam probe with parameters satisfied to perform test of such optical structures.

THPPC055

Permanent Magnet Focusing System for Klystrons

klystron, cathode, focusing, electron

3413

Y. Fuwa, Y. Iwashita, H. Tongu, S. Ushijima
Kyoto ICR, Uji, Kyoto, Japan
S. Fukuda
KEK, Ibaraki, Japan

The Distributed RF System (DRFS) for ILC requires thousands of klystrons. The failure rate of the power supply for solenoid focusing coil of each klystron may be harmful to a regular operation of the ILC. In order to eliminate the power supplies and the cooling system for the coils, a permanent magnet beam focusing system is under development. It will help to reduce the power consumption as well. In our design, a unidirectional magnetic field configuration is adopted to eliminate the stop bands that arise from the periodic permanent magnet configuration. Since the required magnetic field is not high in this case, inexpensive anisotropic ferrite magnets can be used instead of magnets containing rare earth materials. On the basis of a half scaled model fabricated to evaluate the mechanical design, a full scaled model will be ready soon. In order to prove its feasibility, a power test of the klystron for DRFS with this magnet system is planned. The result of magnetic field distribution measurement and the power test will be presented.

THPPD001

Stretched-wire Measurements of Small Bore Multipole Magnets

multipole, quadrupole, simulation, alignment

3500

G. Lebec, J. Chavanne, C. Penel
ESRF, Grenoble, France

Stretched-wire (SW) measurements of magnetic multipoles have been performed at radii ranging from 0.5 mm to 4 mm, with an accuracy of 10^-3 of the main multipole component. Theoretical aspects of SW measurements were investigated. The processing of the measured signals is based on a least square approach, instead of the Fourier transform widely used for rotating coil measurements. It allows correcting numerically the position errors of the SW and designing SW trajectory which are not sensitive to the main multipole, as with “bucked” rotating coils. This SW measurement bench was developed for the characterization of new ESRF magnets. It has been tested first with large aperture multipole magnets. An accuracy of 10^-4 has been obtained for a measurement radius of 30 mm. There is a demand in the magnetic measurement community for measuring small bore multipole magnets, with radius smaller than 5 mm. A small permanent magnet quadrupole was built in order to test the bench at small measurement radii.

THPPD009

Accelerator Magnets R&D Programme at CERN

dipole, quadrupole, linac, luminosity

3512

D. Tommasini, L. Bottura, G. De Rijk, L. Rossi
CERN, Geneva, Switzerland

The exploitation and evolution of the CERN accelerator complex pose a continuous challenge for magnet engineers. Superconducting and resistive magnets have a comparable share. The overall mass of either is approximately 50,000 tons, spread over 3 major machines (PS, SPS and LHC), two large experimental area, and a number of smaller experiments and accelerator rings. On the short term (2012-2014) the CERN plan is to upgrade its injection chain (Linac4) and experimental area (HIE-Isolde, ELENA) that require mostly a multitude of resistive magnets. The medium-term plan for the evolution of the LHC complex (2015-2021), also referred to as High-Luminosity LHC, foresees interventions on about 1 km of the machine, with magnets to be substituted with higher field, larger aperture, or both. On the long term (2025-2035) we are exploring the technological challenges of very high field magnets, at the verge of 20 T for a High Energy LHC (HE-LHC), or extremely stable high gradient quadrupoles for the Compact Linear Collider (CLIC). In this paper we provide an overview of the R&D activities addressing the various lines of development, the technology milestones, and a broad time schedule.

THPPD010

Design, Assembly and First Measurements of a Short Model for CLIC Final Focus Hybrid Quadrupole QD0

quadrupole, multipole, magnet-design, lattice

3515

M. Modena, O. Dunkel, J.G. Perez, C. Petrone, P.A. Thonet, D. Tommasini
CERN, Geneva, Switzerland
E. Solodko, A.S. Vorozhtsov
JINR, Dubna, Moscow Region, Russia

In the framework of the Compact Linear Collider (CLIC) R&D, a tunable hybrid magnet design has been proposed for the final focus QD0 quadrupole. A short model of the magnet has been realized in order to validate the novel design and its expected performances. In order to achieve extremely high quadrupole gradients (>500 T/m), the magnet design combines: a core structure made in magnetic CoFe alloy “Permendur”, permanent magnet blocks, and air-cooled electromagnetic coils. Relevant aspects of this design are the wide tunability of the gradient range, the compactness and the absence of any vibrations. In this paper a reminder of the magnet design concept is given; then, the procurement and assembly main aspects are presented, followed by the results of the magnetic measurements. Finally, some manufacturing considerations relative to a full size magnet procurement are discussed.

THPPD016

Construction and Measurement of Novel Adjustable Permanent Magnet Quadrupoles for CLIC

quadrupole, multipole, collider, linear-collider

3530

B.J.A. Shepherd, J.A. Clarke
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The CLIC drive beam decelerator requires 41,848 quadrupoles along its 42km length. In response to concerns over the heat load and operating costs of electromagnet systems, ASTeC in collaboration with CERN is developing adjustable permanent magnet-based quadrupoles. This novel design concept uses moving permanent magnets to adjust the quadrupole strength over a wide operating range. The design has focused not just on achieving the field strength and quality required but has also tried to make the design well suited to mass production, as the CLIC project requires 50 magnets to be completed every day for three years. Two permanent magnet quadrupole families have been designed, for the low and high energy ends of the decelerator respectively. We present the current status of the project, including construction and magnetic measurements of the first prototype.

THPPD033

Using Permanent Magnets to Boost the Dipole Field for the High-energy LHC

dipole, cryogenics, background, radiation

3578

F. Zimmermann
CERN, Geneva, Switzerland
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan

Funding: Work supported by the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no. 227579.
The High-Energy LHC (HE-LHC) will be a new accelerator in the LHC tunnel based on novel dipole magnets, with a field up to 20 T, which are proposed to be realized by a hybrid-coil design, comprising blocks made from Nb-Ti, Nb3Sn and HTS, respectively. Without the HTS the field would be only 15 T. In this note we propose and study the possibility of replacing the inner HTS layer by (weaker) permanent magnets that might contribute a field of 1-2 T, so that the final field would reach 16-17 T. Advantages would be the lower price of permanent magnets compared with HTS magnets and their availability.

FRXAB01

Symplectic Tracking and Compensation of Dynamic Field Integrals in Complex Undulator Structures

undulator, simulation, polarization, dipole

4165

J. Bahrdt, G. Wüstefeld
HZB, Berlin, Germany

This presentation covers analytical models that describe the interaction of an electron beam with the magnetic field of undulators. Analytic approximations to the Hamilton-Jacobi equation yield generating functions useful for particle tracking and therefore efficient simulation. Analytic expressions for kick maps of APPLE II undulators are presented as well. Passive and active shimming schemes including magic fingers and current sheets are also modeled. Applications at BESSY II are discussed which ensure efficient injection during top-up to satisfy machine protection and radiation safety requirements.

Slides FRXAB01 [1.922 MB]