Application of high-temperature superconducting permanent magnets to synchrotron radiation sources

Tanaka, Takashi; Hara, Toru; Kitamura, Hideo; Tsuru, Rieko; Bizen, Teruhiko; Maréchal, Xavier-Marie; Seike, T.

doi:10.1103/physrevstab.7.090704

Cited by 28 publications

(16 citation statements)

References 21 publications

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“…As one of challenging technologies in the next generation Free Electron Laser (FEL), application of high-Tc superconductors (HTS) for undulator magnets has been proposed to obtain very strong magnetic field [1][2][3]. Since the HTSs for the undulator have to be magnetized all together in a cryostat, it is not easy to create sinusoidal magnetic field along the electron trajectory.…”

Section: Introductionmentioning

confidence: 99%

Simulation of magnetization process of Pure-type superconductor magnet undulator based on T-method

Deri

Kawaguchi

Tsuchimoto

et al. 2015

Physica C: Superconductivity and its Applications

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Available online xxxx Keywords: Free Electron Laser (FEL) High Tc superconductor (HTS) Current vector potential method (T-method) Critical state model a b s t r a c tFor the next generation Free Electron Laser, Pure-type undulator made of high Tc superconductors (HTSs) was considered to achieve a small size and high intensity magnetic field undulator. In general, it is very difficult to adjust the undulator magnet alignment after the HTS magnetization since the entire undulator is installed inside a cryostat. The appropriate HTS alignment has to be determined in the design stage. This paper presents the development of a numerical simulation code for magnetization process of the Pure-type HTS undulator to assist the design of the optimal size and alignment of the HTS magnets.

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Section: Introductionmentioning

confidence: 99%

Simulation of magnetization process of Pure-type superconductor magnet undulator based on T-method

Deri

Kawaguchi

Tsuchimoto

et al. 2015

Physica C: Superconductivity and its Applications

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“…So far, various approaches to achieving this have been proposed. Cryoundulator plus (CU+) [14], in which bulk HTS rings are mounted on PMs to enhance the magnetic field in a CPMU, has been proposed and demonstrated. A superconducting PM undulator [15,16], in which bulk HTSs are magnetized by a dipole field perpendicular to the beam axis, has also been developed.…”

Section: Introductionmentioning

confidence: 99%

Magnetic property of a staggered-array undulator using a bulk high-temperature superconductor

Kinjo

Mishima

Choi

et al. 2014

Phys. Rev. ST Accel. Beams

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The magnetic field of a staggered-array undulator using a bulk high-temperature superconductor is calculated by analytical and numerical methods. Analytical formulas for the undulator field and the solenoid field required to generate the undulator field are derived from a simple two-dimensional model. The analytical calculation shows the degree of dependence of these fields on the undulator parameters, the generation of a high undulator field proportional to the critical current density of the bulk superconductor, and the good tunability of the undulator field over a wide range of values. The numerical calculation is performed in a three-dimensional geometry by two methods: the center field and energy minimization methods. The latter treats the current distribution inside the bulk, whereas the former neglects it as a natural extension of the analytical model. The calculation also reveals the dependence of the fields on the undulator parameters arising from the current distribution. From the comparison with experimental results, we find that the latter method reproduces the experimental results well, which indicates the importance of the current distribution inside the bulk. Therefore, we derive a semiempirical formula for the required solenoid field by modifying the analytical formula using the numerical results so as to include the effect of the current distribution. The semiempirical formula reproduces the numerical result with an error of 3%. Finally, we estimate the magnetic performance of the undulator as an example of using the formulas and values presented in this paper. The estimation shows that an undulator field twice as large as that of the present in-vacuum undulator but with an equal period and gap can be obtained at a temperature of approximately 20-40 K, and that deflection parameters (K values) of 1 and 2 can be achieved with periods of 5 and 10 mm at approximately 4-20 K.

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“…For this reason, superconducting insertion devices and invacuum undulators at room or cryogenic temperature [1] must be developed. For the outside-vacuum undulators, a conventional planar undulator or an elliptically polarized undulator can be used.…”

Section: Introductionmentioning

confidence: 99%

Planning of insertion devices for the 3-GeV Taiwan Photon Source

Hwang

2007

2007 IEEE Particle Accelerator Conference (PAC)

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The Taiwan Photon Source (TPS) is a 3-GeV storage ring with 24 straight sections for installation of insertion devices (ID), radio-frequency cavities (RF) and electronbeam injection. Most insertion devices are in-vacuum undulators to produce intense X-rays with a brilliance up to 1×10 21 photons s -1 mrad -2 mm -2 per 0.1 % bw. A superconducting wiggler is also necessary to provide higher energy in the medium-energy range of the TPS. The APPLE II elliptically polarized undulator and a longperiod undulator provide a source with circular and any linear polarization and the VUV source. Projects to investigate a superconducting undulator and a cryogenic permanent-magnet undulator are launched for energies in a range 1.5 -25 keV.

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Application of high-temperature superconducting permanent magnets to synchrotron radiation sources

Cited by 28 publications

References 21 publications

Simulation of magnetization process of Pure-type superconductor magnet undulator based on T-method

Simulation of magnetization process of Pure-type superconductor magnet undulator based on T-method

Magnetic property of a staggered-array undulator using a bulk high-temperature superconductor

Planning of insertion devices for the 3-GeV Taiwan Photon Source

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