IPAC2014 - List of Keywords (permanent-magnet)

Paper	Title	Other Keywords	Page
TUZB01	Prospects for the use of Permanent Magnets in Future Accelerator Facilities	undulator, radiation, lattice, dipole	968
	J. Chavanne, G. Le Bec ESRF, Grenoble, France
	Permanent magnet based accelerator magnets may offer a viable alternative to their conventional electromagnetic pairs for many applications, especially where strong gradients and low power consumption is needed. As an example, the development of future light sources based on ultimate storage ring needs to be done in an important energy saving context aiming at a significant reduction of operational costs. After more than two decades of continuous developments in the field of permanent insertion devices, a knowledge capital on different issues such as aging effects has been gained. This technology seems ready to jump into the design and construction of advanced accelerator magnets. This talk reviews the status of the permanent magnet technology and the perspectives for its implementations in standard lattice magnets, highlighting both the advantages and the challenges as compared to electromagnetic magnets.
	Slides TUZB01 [9.341 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUZB01
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TUPRO080	Experience with a NdFeB based 1 Tm Dipole	synchrotron, radiation, injection, dipole	1226
	F. Bødker, L.O. Baandrup, A. Baurichter, N. Hauge, K.F. Laurberg, B.R. Nielsen, G. Nielsen Danfysik A/S, Taastrup, Denmark O. Balling Aarhus University, Aarhus, Denmark F.B. Bendixen, P. Kjeldsteen, P. Valler Sintex A/S, Hobro, Denmark N. Hertel, S.P. Møller, J.S. Nielsen, H.D. Thomsen ISA, Aarhus, Denmark
	Funding: *Work supported by The Danish National Advanced Technology Foundation A 30° Green Magnet based on permanent NdFeB magnets has been developed and installed in the injection line at the ASTRID2 synchrotron light source. The cost efficient design is optimized for a 1 T field at a length of 1 m using shaped iron poles to surpass the required field homogeneity. The inherent temperature dependence of NdFeB has been passively compensated to below 30 ppm/°C. A study of potential demagnetization effects has been performed by irradiation of NdFeB samples placed directly in a 100 MeV e-beam. A high permanent magnet work point was found to result in enhanced robustness, and the risk of demagnetization was found to be negligible for typical synchrotron applications. The magnet has successfully been in operation at ASTRID2 since autumn 2013.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO080
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TUPRO085	Properties, Options and Limitations of PrFeB-magnets for Cryogenic Undulators	undulator, cryogenics, induction, polarization	1238
	F.-J. Börgermann, C. Brombacher, K. Üstüner Vacuumschmelze GmbH & Co. KG, Hanau, Germany
	The gap induction and thus the K-factor of permanent magnet undulators may be increased by cooling them to cryogenic temperatures. The use of NdFeB-magnets in cryogenic undulators, however, is limited to temperatures above 140 K due to the spin-reorientation transition (SRT) which leads to a reduction of the magnetization level. A further increase of the gap induction in undulators may be achieved by use of PrFeB-magnets at even lower temperatures, as this alloy does not show the SRT phenomenon. Although the effects are well known, up to now only a few undulator prototypes were built using this class of material since the coercivity of ternary PrFeB-magnets is not sufficient to minimize the risk of partial demagnetization when the undulator structure is kept at room temperature. This problem can be solved by applying actual technologies like grain-boundary diffusion in order to achieve coercivities exceeding 20 kOe at RT without sacrificing the high remanence Br of about 1.6 T at 77 K. We will provide actual data of the magnet performance achieved and show up the technological limitations in building PrFeB-based CPMU’s.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO085
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TUPRO091	Simple Characterization Method of Small High Gradient Permanent Magnet Quadrupoles	quadrupole, proton, linac, focusing	1250
	C. Ronsivalle, L. Picardi, M. Vadrucci ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini URLS, Rome, Italy
	The application of quadrupoles with high or ultra-high gradient and small apertures requires a precise control over harmonic components of the field. A simple, fast, low cost measurement method on small size PMQs (Permanent Magnet Quadrupoles) is described. It is based on the same principle of the familiar "rotating coil technique", but in this case, profiting of the small dimensions of the PMQ, it consists in rotating the PMQ itself instead of the coil. In such way a gain on accuracy and measure time is obtained. It has been applied to characterize a set of commercial PMQs with a gradient around 200 T/m and an internal radius of 3.5 mm to be mounted in a SCDTL (Side Coupled Drift Tube Linac) structure for the acceleration of a proton beam from 7 to 12 MeV. This structure has been developed in the framework of the Italian TOP-IMPLART (Intensity Modulated Proton Linear Accelerator for Radiotherapy) Project
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO091
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TUPRO092	Magnetic-field Variable Permanent Dipole Magnet for Future Light Sources	dipole, simulation, operation, emittance	1253
	T. Watanabe, K. Fukami, T. Nakanishi, S. Sasaki JASRI/SPring-8, Hyogo, Japan
	Permanent dipole magnets with variable magnetic field have been designed, fabricated, and tested at SPring-8. Permanent magnets can be advantageous over electromagnets in terms of reliability, stability and compactness in addition to the small power consumption. No unexpected down of an accelerator due to power supply failure is supposed to happen. There is no cooling water flow that can induce a fluctuation of the magnetic field. These features may become important for future light sources, where a very reliable, stable, and compact ring is required. In addition, the power consumption is now one of the most important issues after the 3.11 disaster in Japan. One of critical issues to realize such a magnet is that a magnetic field has to be tuned. In the future, combined-functioned and longitudinally gradient magnets will play a key role in achieving extremely small emittance. In such a case, changing a gap will not work any more. We have designed and fabricated a permanent dipole magnet of which magnetic field can be tuned without changing the gap. The results of the performance test will be presented and a possibility to apply it for future light sources will be discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO092
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TUPRO094	Magnetic Field Evaluation of Multipole Permanent Magnets by Harmonic Coil with Novel Calibration Technique	multipole, focusing, sextupole, neutron	1259
	R. Kitahara, Y. Fuwa, Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan
	Quadrupole magnets for ILC final focus should be strong enough with the restriction on the external radius to let the disrupted out-going beam pass by, while vibration of the magnetic center has to be highly avoided to keep the nm sized beam focusing stable at the interaction point a few meter downstream from the lens. Gluckstern's 5-ring PMQ singlet seems a good candidate for this point of view. In order to fabricate a good 5-ring singlet, property of each ring has to be good enough. A harmonic coil system, which has 24-bit ADC’s for high resolution, was developed. Current noise level of the system is less than 10^-5, which is supposed to be improved by reducing mechanical vibration of the ball bearings. We demonstrated the evaluation method of coil wire position with magnetic field from pin point magnet, so that the accuracy of the method was comparable to um scale. We measured the prototype 5-ring PMQ singlet and evaluated harmonic components. This result was compared with the data measured at KEK.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO094
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TUPRO100	Rare-Earth End Magnets of a Miniature Race-Track Microtron and their Tuning	microtron, linac, quadrupole, simulation	1277
	I.Yu. Vladimirov, N.I. Pakhomov, V.I. Shvedunov MSU, Moscow, Russia Yu.A. Kubyshin UPC, Barcelona, Spain J.P. Rigla I3M, Valencia, Spain V.V. Zakharov Tehnomag ltd., Kaluga, Russia
	We report on the tuning of end magnets of a compact 12 MeV racetrack microtron (RTM) which is under construction at the Technical University of Catalonia. They are magnetic systems composed of four dipoles with the Rare-Earth Permanent Magnet (REPM) material used as a source of the magnetic field. The poles of the magnets are equipped with tuning plungers which allow to adjust the magnetic field level. In the article we describe the tuning procedure and different techniques that were used in order to fulfill strict requirements of the field characteristics of the end magnets. It is shown that the obtained magnetic systems provide correct beam trajectories in the 12 MeV RTM.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO100
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TUPRO103	Novel Magnet Production Technique used for an Elliptically Polarizing Undulator	undulator, controls, multipole, radiation	1286
	E.J. Wallén, K.I. Blomqvist MAX-lab, Lund, Sweden J. Bahrdt HZB, Berlin, Germany F.-J. Börgermann Vacuumschmelze GmbH & Co. KG, Hanau, Germany
	A common problem for elliptically polarizing undulators (EPUs) is that the magnetic forces give a mechanical deflection in the magnet holder construction when changing the undulator phase. Gluing horizontally and vertically magnetized blocks together can increase the mechanical stability of the magnet holders. The gluing process of pairs of magnetized magnet blocks is time-consuming, expensive and difficult to carry out with high positional precision. A novel magnet production technique has been developed where un-magnetized pairs of blocks are glued together before magnetization. The large number of parts, the time for assembly, and the cost of the EPU can be reduced with the novel magnet production technique. The novel magnet production method has been used for a 2.6 m long EPU of APPLE-II type, which has been built in-house at the MAX IV Laboratory. The frame for the EPU is made of cast iron in order to get a small mechanical deformation when changing phase in the inclined mode. The paper includes detailed descriptions of the novel magnet production technique, including measurements of the magnetization, and the new EPU.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO103
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TUPRO113	Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype	quadrupole, linear-collider, collider, magnet-design	1316
	B.J.A. Shepherd, J.A. Clarke, P. Wadhwa STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom A. Bartalesi, M. Modena, M. Struik CERN, Geneva, Switzerland N.A. Collomb STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The 42 km long CLIC Drive Beam Decelerator (DBD) will decelerate beams of electrons from 2.4 GeV to 240 MeV. ASTeC in collaboration with CERN has developed a novel type of tunable permanent magnet quadrupole for the DBD. Two versions of the design were produced, for the high-energy and low-energy ends of the DBD respectively. This paper outlines the design of the low-energy version, which has a tuning range of 3.5-43 T/m. A prototype was built at Daresbury Laboratory (DL) in 2013, and extensive magnetic measurements were carried out at DL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO113
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WEPRO029	Developing of Advanced Magnet Structures for Cryogenic in Vacuum Permanent Magnet Undulators	undulator, cryogenics, vacuum, electron	2004
	C. Kuhn, J. Bahrdt, A. Gaupp, M. Scheer, B. Schulz HZB, Berlin, Germany
	Cryogenic in vacuum permanent magnet undulators with periods less than 10 mm and correspondingly narrow gaps require tighter geometric and magnetic tolerances and complex pole designs from different materials to achieve the needed high field strengths. We use new mechanic designs and manufacturing technologies for magnet and pole assembly. We develop new precise and UHV-compatible joining methods which are different from the current approaches which are based on mechanical clamping or gluing. . We examine the mechanical and magnetic properties by performing tests and discuss the results.
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WEPME031	Magnetic Design of the First Prototype Pure Permanent Magnet Undulator for the ILSF	undulator, brilliance, radiation, electron	2326
	A. Ramezani Moghaddam, J. Rahighi ILSF, Tehran, Iran H. Ghasem IPM, Tehran, Iran M. Lamehi Rashti Nuclear Science & Technology Research Institute, Tehran, Iran A. Ramezani Moghaddam NSTRI, Tehran, Iran
	Iranian light source facility (ILSF) is a 3GeV, 400 mA, 3rd generation light source under design and construction. This paper describes the details of the preliminary magnetic design of the first prototype PPM undulator for the ILSF. In the preliminary design, the undulator period and some other parameters have been determined to reach desired x-ray spectrum to be used for soft x-ray application. A PPM layout and a model undulator with 16 poles is used to calculate the properties of the designs.
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WEPRI105	Preliminary Design of Cooling System for a PrFeB-based Cryogenic Permanent Magnet Undulator Prototype at IHEP	vacuum, cryogenics, undulator, simulation	2743
	Y.C. Zhang, S.P. Li, H.H. Lu, S.C. Sun, Y.F. Yang IHEP, Beijing, People's Republic of China
	A circulation cooling system is under progress for a 2-m-long PrFeB-based cryogenic permanent magnet undulator (CPMU) prototype at IHEP. Sub-cooled liquid nitrogen flows through each in-vacuum girder back and forth once. Refrigerant channels for both girders are parallel connected in vacuum chamber. Numerical simulation shows that the cooling system is able to cool down magnet array from 300 K to 83 K. Meanwhile, phase error increases about 0.1 degree.
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THPRO055	Electron Beam Final Focus System for Thomson Scattering at ELBE	quadrupole, electron, focusing, laser	2995
	J.M. Krämer, F. Bødker, A. Baurichter, M. Budde Danfysik A/S, Taastrup, Denmark A. Irman, U. Schramm Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany U. Lehnert, P. Michel HZDR, Dresden, Germany
	Funding: This work is part of LA3NET and funded by European Commission under Grant Agreement Number 289191. The design of an electron beam Final Focus System (FFS) aiming for high-flux laser-Thomson backscattering x-ray sources at ELBE* is presented. A telescope system consisting of four permanent magnet based quadrupoles was found to have significantly less chromatic aberrations than a quadrupole triplet. This allows sub-ps electron beam focusing to match the laser spot size at the interaction point. Focusing properties like the position of the focal plane and the spot size are retained for electron beam energies between 20 and 30 MeV by adjusting the position of the quadrupoles individually on a motorized stage. Since the electron beam is chirped for bunch compression upstream, the rms energy spread is increased to one or two percent and second order chromatic effects must be taken into account. For an emittance of 13 pi mm mrad, we predict rms spot sizes of about 40 um and divergences of about 15 mrad. We also present the design of the permanent magnet quadrupoles to be used for the FFS. Ferromagnetic poles ensure a high field quality and adjustable shunts allow for fine adjustment of the field strength and compensation of deviations in the permanent magnet material. *A. Jochmann et al., Phys. Rev. Lett. 111 (2013) 114803
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FRXBA01	Imaging Systems for 800 MeV Proton Radiography	proton, scattering, quadrupole, experiment	4057
	F.E. Merrill, D.B. Barlow, C.J. Espinoza, B.J. Hollander, K. Kwiatkowki, J.D. Lopez, F.G. Mariam, D.J. Morley, C.L. Morris, P. Nedrow, A. Saunders, A. Tainter, D. Tupa, J. Tybo LANL, Los Alamos, New Mexico, USA
	Los Alamos National Laboratory has developed the technique of proton radiography as a flash radiography system for the study of dynamic systems. Historically these studies have focused on measuring fundamental material properties of dynamic materials (equation of state, strength, phase transitions) as well as the physical processes important in predicting the hydrodynamic flow of these materials at high velocity pressure and density (instabilities such as Richtmyer-Meshkov, Rayleigh-Taylor and Kelvin-Helmholtz). Recently these techniques have been extended to new applications which benefit from the unique capabilities of 800 MeV proton radiography. These new applications range from the study of metal alloy solidification to medical imaging applications. In addition to extending the application of this capability performance improvements have been investigated for future implementation. The results of dynamic studies and new applications are presented along with a proposed plan for future radiographic improvements.
	Slides FRXBA01 [8.667 MB]
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Paper

Title

Other Keywords

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TUZB01

Prospects for the use of Permanent Magnets in Future Accelerator Facilities

undulator, radiation, lattice, dipole

968

J. Chavanne, G. Le Bec
ESRF, Grenoble, France

Permanent magnet based accelerator magnets may offer a viable alternative to their conventional electromagnetic pairs for many applications, especially where strong gradients and low power consumption is needed. As an example, the development of future light sources based on ultimate storage ring needs to be done in an important energy saving context aiming at a significant reduction of operational costs. After more than two decades of continuous developments in the field of permanent insertion devices, a knowledge capital on different issues such as aging effects has been gained. This technology seems ready to jump into the design and construction of advanced accelerator magnets. This talk reviews the status of the permanent magnet technology and the perspectives for its implementations in standard lattice magnets, highlighting both the advantages and the challenges as compared to electromagnetic magnets.

Slides TUZB01 [9.341 MB]

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TUPRO080

Experience with a NdFeB based 1 Tm Dipole

synchrotron, radiation, injection, dipole

1226

F. Bødker, L.O. Baandrup, A. Baurichter, N. Hauge, K.F. Laurberg, B.R. Nielsen, G. Nielsen
Danfysik A/S, Taastrup, Denmark
O. Balling
Aarhus University, Aarhus, Denmark
F.B. Bendixen, P. Kjeldsteen, P. Valler
Sintex A/S, Hobro, Denmark
N. Hertel, S.P. Møller, J.S. Nielsen, H.D. Thomsen
ISA, Aarhus, Denmark

Funding: *Work supported by The Danish National Advanced Technology Foundation
A 30° Green Magnet based on permanent NdFeB magnets has been developed and installed in the injection line at the ASTRID2 synchrotron light source. The cost efficient design is optimized for a 1 T field at a length of 1 m using shaped iron poles to surpass the required field homogeneity. The inherent temperature dependence of NdFeB has been passively compensated to below 30 ppm/°C. A study of potential demagnetization effects has been performed by irradiation of NdFeB samples placed directly in a 100 MeV e-beam. A high permanent magnet work point was found to result in enhanced robustness, and the risk of demagnetization was found to be negligible for typical synchrotron applications. The magnet has successfully been in operation at ASTRID2 since autumn 2013.

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TUPRO085

Properties, Options and Limitations of PrFeB-magnets for Cryogenic Undulators

undulator, cryogenics, induction, polarization

1238

F.-J. Börgermann, C. Brombacher, K. Üstüner
Vacuumschmelze GmbH & Co. KG, Hanau, Germany

The gap induction and thus the K-factor of permanent magnet undulators may be increased by cooling them to cryogenic temperatures. The use of NdFeB-magnets in cryogenic undulators, however, is limited to temperatures above 140 K due to the spin-reorientation transition (SRT) which leads to a reduction of the magnetization level. A further increase of the gap induction in undulators may be achieved by use of PrFeB-magnets at even lower temperatures, as this alloy does not show the SRT phenomenon. Although the effects are well known, up to now only a few undulator prototypes were built using this class of material since the coercivity of ternary PrFeB-magnets is not sufficient to minimize the risk of partial demagnetization when the undulator structure is kept at room temperature. This problem can be solved by applying actual technologies like grain-boundary diffusion in order to achieve coercivities exceeding 20 kOe at RT without sacrificing the high remanence Br of about 1.6 T at 77 K. We will provide actual data of the magnet performance achieved and show up the technological limitations in building PrFeB-based CPMU’s.

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TUPRO091

Simple Characterization Method of Small High Gradient Permanent Magnet Quadrupoles

quadrupole, proton, linac, focusing

1250

C. Ronsivalle, L. Picardi, M. Vadrucci
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Ambrosini
URLS, Rome, Italy

The application of quadrupoles with high or ultra-high gradient and small apertures requires a precise control over harmonic components of the field. A simple, fast, low cost measurement method on small size PMQs (Permanent Magnet Quadrupoles) is described. It is based on the same principle of the familiar "rotating coil technique", but in this case, profiting of the small dimensions of the PMQ, it consists in rotating the PMQ itself instead of the coil. In such way a gain on accuracy and measure time is obtained. It has been applied to characterize a set of commercial PMQs with a gradient around 200 T/m and an internal radius of 3.5 mm to be mounted in a SCDTL (Side Coupled Drift Tube Linac) structure for the acceleration of a proton beam from 7 to 12 MeV. This structure has been developed in the framework of the Italian TOP-IMPLART (Intensity Modulated Proton Linear Accelerator for Radiotherapy) Project

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TUPRO092

Magnetic-field Variable Permanent Dipole Magnet for Future Light Sources

dipole, simulation, operation, emittance

1253

T. Watanabe, K. Fukami, T. Nakanishi, S. Sasaki
JASRI/SPring-8, Hyogo, Japan

Permanent dipole magnets with variable magnetic field have been designed, fabricated, and tested at SPring-8. Permanent magnets can be advantageous over electromagnets in terms of reliability, stability and compactness in addition to the small power consumption. No unexpected down of an accelerator due to power supply failure is supposed to happen. There is no cooling water flow that can induce a fluctuation of the magnetic field. These features may become important for future light sources, where a very reliable, stable, and compact ring is required. In addition, the power consumption is now one of the most important issues after the 3.11 disaster in Japan. One of critical issues to realize such a magnet is that a magnetic field has to be tuned. In the future, combined-functioned and longitudinally gradient magnets will play a key role in achieving extremely small emittance. In such a case, changing a gap will not work any more. We have designed and fabricated a permanent dipole magnet of which magnetic field can be tuned without changing the gap. The results of the performance test will be presented and a possibility to apply it for future light sources will be discussed.

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TUPRO094

Magnetic Field Evaluation of Multipole Permanent Magnets by Harmonic Coil with Novel Calibration Technique

multipole, focusing, sextupole, neutron

1259

R. Kitahara, Y. Fuwa, Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan

Quadrupole magnets for ILC final focus should be strong enough with the restriction on the external radius to let the disrupted out-going beam pass by, while vibration of the magnetic center has to be highly avoided to keep the nm sized beam focusing stable at the interaction point a few meter downstream from the lens. Gluckstern's 5-ring PMQ singlet seems a good candidate for this point of view. In order to fabricate a good 5-ring singlet, property of each ring has to be good enough. A harmonic coil system, which has 24-bit ADC’s for high resolution, was developed. Current noise level of the system is less than 10^-5, which is supposed to be improved by reducing mechanical vibration of the ball bearings. We demonstrated the evaluation method of coil wire position with magnetic field from pin point magnet, so that the accuracy of the method was comparable to um scale. We measured the prototype 5-ring PMQ singlet and evaluated harmonic components. This result was compared with the data measured at KEK.

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TUPRO100

Rare-Earth End Magnets of a Miniature Race-Track Microtron and their Tuning

microtron, linac, quadrupole, simulation

1277

I.Yu. Vladimirov, N.I. Pakhomov, V.I. Shvedunov
MSU, Moscow, Russia
Yu.A. Kubyshin
UPC, Barcelona, Spain
J.P. Rigla
I3M, Valencia, Spain
V.V. Zakharov
Tehnomag ltd., Kaluga, Russia

We report on the tuning of end magnets of a compact 12 MeV racetrack microtron (RTM) which is under construction at the Technical University of Catalonia. They are magnetic systems composed of four dipoles with the Rare-Earth Permanent Magnet (REPM) material used as a source of the magnetic field. The poles of the magnets are equipped with tuning plungers which allow to adjust the magnetic field level. In the article we describe the tuning procedure and different techniques that were used in order to fulfill strict requirements of the field characteristics of the end magnets. It is shown that the obtained magnetic systems provide correct beam trajectories in the 12 MeV RTM.

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TUPRO103

Novel Magnet Production Technique used for an Elliptically Polarizing Undulator

undulator, controls, multipole, radiation

1286

E.J. Wallén, K.I. Blomqvist
MAX-lab, Lund, Sweden
J. Bahrdt
HZB, Berlin, Germany
F.-J. Börgermann
Vacuumschmelze GmbH & Co. KG, Hanau, Germany

A common problem for elliptically polarizing undulators (EPUs) is that the magnetic forces give a mechanical deflection in the magnet holder construction when changing the undulator phase. Gluing horizontally and vertically magnetized blocks together can increase the mechanical stability of the magnet holders. The gluing process of pairs of magnetized magnet blocks is time-consuming, expensive and difficult to carry out with high positional precision. A novel magnet production technique has been developed where un-magnetized pairs of blocks are glued together before magnetization. The large number of parts, the time for assembly, and the cost of the EPU can be reduced with the novel magnet production technique. The novel magnet production method has been used for a 2.6 m long EPU of APPLE-II type, which has been built in-house at the MAX IV Laboratory. The frame for the EPU is made of cast iron in order to get a small mechanical deformation when changing phase in the inclined mode. The paper includes detailed descriptions of the novel magnet production technique, including measurements of the magnetization, and the new EPU.

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TUPRO113

Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype

quadrupole, linear-collider, collider, magnet-design

1316

B.J.A. Shepherd, J.A. Clarke, P. Wadhwa
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
A. Bartalesi, M. Modena, M. Struik
CERN, Geneva, Switzerland
N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The 42 km long CLIC Drive Beam Decelerator (DBD) will decelerate beams of electrons from 2.4 GeV to 240 MeV. ASTeC in collaboration with CERN has developed a novel type of tunable permanent magnet quadrupole for the DBD. Two versions of the design were produced, for the high-energy and low-energy ends of the DBD respectively. This paper outlines the design of the low-energy version, which has a tuning range of 3.5-43 T/m. A prototype was built at Daresbury Laboratory (DL) in 2013, and extensive magnetic measurements were carried out at DL.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO113

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WEPRO029

Developing of Advanced Magnet Structures for Cryogenic in Vacuum Permanent Magnet Undulators

undulator, cryogenics, vacuum, electron

2004

C. Kuhn, J. Bahrdt, A. Gaupp, M. Scheer, B. Schulz
HZB, Berlin, Germany

Cryogenic in vacuum permanent magnet undulators with periods less than 10 mm and correspondingly narrow gaps require tighter geometric and magnetic tolerances and complex pole designs from different materials to achieve the needed high field strengths. We use new mechanic designs and manufacturing technologies for magnet and pole assembly. We develop new precise and UHV-compatible joining methods which are different from the current approaches which are based on mechanical clamping or gluing. . We examine the mechanical and magnetic properties by performing tests and discuss the results.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO029

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WEPME031

Magnetic Design of the First Prototype Pure Permanent Magnet Undulator for the ILSF

undulator, brilliance, radiation, electron

2326

A. Ramezani Moghaddam, J. Rahighi
ILSF, Tehran, Iran
H. Ghasem
IPM, Tehran, Iran
M. Lamehi Rashti
Nuclear Science & Technology Research Institute, Tehran, Iran
A. Ramezani Moghaddam
NSTRI, Tehran, Iran

Iranian light source facility (ILSF) is a 3GeV, 400 mA, 3rd generation light source under design and construction. This paper describes the details of the preliminary magnetic design of the first prototype PPM undulator for the ILSF. In the preliminary design, the undulator period and some other parameters have been determined to reach desired x-ray spectrum to be used for soft x-ray application. A PPM layout and a model undulator with 16 poles is used to calculate the properties of the designs.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME031

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WEPRI105

Preliminary Design of Cooling System for a PrFeB-based Cryogenic Permanent Magnet Undulator Prototype at IHEP

vacuum, cryogenics, undulator, simulation

2743

Y.C. Zhang, S.P. Li, H.H. Lu, S.C. Sun, Y.F. Yang
IHEP, Beijing, People's Republic of China

A circulation cooling system is under progress for a 2-m-long PrFeB-based cryogenic permanent magnet undulator (CPMU) prototype at IHEP. Sub-cooled liquid nitrogen flows through each in-vacuum girder back and forth once. Refrigerant channels for both girders are parallel connected in vacuum chamber. Numerical simulation shows that the cooling system is able to cool down magnet array from 300 K to 83 K. Meanwhile, phase error increases about 0.1 degree.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI105

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THPRO055

Electron Beam Final Focus System for Thomson Scattering at ELBE

quadrupole, electron, focusing, laser

2995

J.M. Krämer, F. Bødker, A. Baurichter, M. Budde
Danfysik A/S, Taastrup, Denmark
A. Irman, U. Schramm
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
U. Lehnert, P. Michel
HZDR, Dresden, Germany

Funding: This work is part of LA3NET and funded by European Commission under Grant Agreement Number 289191.
The design of an electron beam Final Focus System (FFS) aiming for high-flux laser-Thomson backscattering x-ray sources at ELBE* is presented. A telescope system consisting of four permanent magnet based quadrupoles was found to have significantly less chromatic aberrations than a quadrupole triplet. This allows sub-ps electron beam focusing to match the laser spot size at the interaction point. Focusing properties like the position of the focal plane and the spot size are retained for electron beam energies between 20 and 30 MeV by adjusting the position of the quadrupoles individually on a motorized stage. Since the electron beam is chirped for bunch compression upstream, the rms energy spread is increased to one or two percent and second order chromatic effects must be taken into account. For an emittance of 13 pi mm mrad, we predict rms spot sizes of about 40 um and divergences of about 15 mrad. We also present the design of the permanent magnet quadrupoles to be used for the FFS. Ferromagnetic poles ensure a high field quality and adjustable shunts allow for fine adjustment of the field strength and compensation of deviations in the permanent magnet material.
*A. Jochmann et al., Phys. Rev. Lett. 111 (2013) 114803

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FRXBA01

Imaging Systems for 800 MeV Proton Radiography

proton, scattering, quadrupole, experiment

4057

F.E. Merrill, D.B. Barlow, C.J. Espinoza, B.J. Hollander, K. Kwiatkowki, J.D. Lopez, F.G. Mariam, D.J. Morley, C.L. Morris, P. Nedrow, A. Saunders, A. Tainter, D. Tupa, J. Tybo
LANL, Los Alamos, New Mexico, USA

Los Alamos National Laboratory has developed the technique of proton radiography as a flash radiography system for the study of dynamic systems. Historically these studies have focused on measuring fundamental material properties of dynamic materials (equation of state, strength, phase transitions) as well as the physical processes important in predicting the hydrodynamic flow of these materials at high velocity pressure and density (instabilities such as Richtmyer-Meshkov, Rayleigh-Taylor and Kelvin-Helmholtz). Recently these techniques have been extended to new applications which benefit from the unique capabilities of 800 MeV proton radiography. These new applications range from the study of metal alloy solidification to medical imaging applications. In addition to extending the application of this capability performance improvements have been investigated for future implementation. The results of dynamic studies and new applications are presented along with a proposed plan for future radiographic improvements.

Slides FRXBA01 [8.667 MB]

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