Design and construction performance of a compact cryogen-free superconducting wavelength shifter

et al. 2007

J Synchrotron Radiat

Using a superconducting-wavelength-shifter X-ray source with a photon flux density of 10(11)-10(13) photons s(-1) mrad(-1) (0.1% bandwidth)(-1) (200 mA)(-1) in the energy range 5-35 keV, three hard X-ray beamlines, BL01A, BL01B and BL01C, have been designed and constructed at the 1.5 GeV storage ring of the National Synchrotron Radiation Research Center (NSRRC). These have been designed for structure-related research using X-ray imaging, absorption, scattering and diffraction. The branch beamline BL01A, which has an unmonochromatized beam, is suitable for phase-contrast X-ray imaging with a spatial resolution of 1 microm and an imaging efficiency of one frame per 10 ms. The main beamline BL01B has 1:1 beam focusing and a medium energy resolution of approximately 10(-3). It has been designed for small-angle X-ray scattering and transmission X-ray microscopy, used, respectively, in anomalous scattering and nanophase-contrast imaging with 30 nm spatial resolution. Finally, the branch beamline BL01C, which features collimating and focusing mirrors and a double-crystal monochromator for a high energy resolution of approximately 10(-4), has been designed for X-ray absorption spectroscopy and high-resolution powder X-ray diffraction. These instruments, providing complementary tools for studying multiphase structures, have opened up a new research trend of integrated structural study at the NSRRC, especially in biology and materials. Examples illustrating the performances of the beamlines and the instruments installed are presented.

Section: Photon Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

X-ray beamlines for structural studies at the NSRRC superconducting wavelength shifter

Song

Chang

et al. 2007

J Synchrotron Radiat

IEEE Trans. Appl. Supercond.

“…Each of two traditional cooling methods-either a cryo-cooler or -has its own features. The operation of the LHe cooling method is tedious, and the operation cost is great for an experiment; a hybrid cooling system with a cryo-cooler [12] and liquid was hence designed. A cooling system for the portable high-field magnet with large-diameter bulk YBCO was also designed.…”

Section: Introductionmentioning

confidence: 99%

A Superconducting Magnetization System With Hybrid Superconducting Wire for the Study and Application of Superconductivity

Chen

Yu²,

Jan

et al. 2012

For the study of high-temperature superconductors and for the application of superconductivity, a superconducting high-field magnetization system with a hybrid superconducting coil was designed. This coil is composed of superconducting wires of three kinds-HTS YBCO 2G-wire, high-field and low-field NbTi wires. Three principal purposes of building this system are to inspect the characteristics of disk-shape bulk YBCO, to develop a HTS-bulk undulator, and to magnetize a portable HTS-bulk high-field magnet for application to a resonant X-ray scattering experiment. With four steps of temperature decrease, a two-stage GM-type cryocooler and liquid nitrogen provide cooling for the magnetization system. The hybrid superconducting coil, two cryogenic systems for the magnetization system and the portable HTS-bulk magnet, and the control and monitor systems that were designed are discussed.

“…Although the accelerator was built for VUV and soft X-ray applications, the ever-increasing hard X-ray users constantly urge for more hard X-ray sources. Recently, the success in designing and operating superconducting magnets of a few teslas at the NSRRC has greatly facilitated the development of hard X-ray sources with the low-energy storage ring (Hwang et al, 2002). Within a few years, three hard X-ray beamlines for imaging, absorption and diffraction were built with a superconducting-wavelength-shifter insertion device with a magnetic field of 5 T (Song et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

A dedicated small-angle X-ray scattering beamline with a superconducting wiggler source at the NSRRC

Chang

et al. 2008

J Synchrotron Radiat

At the National Synchrotron Radiation Research Center (NSRRC), which operates a 1.5 GeV storage ring, a dedicated small-angle X-ray scattering (SAXS) beamline has been installed with an in-achromat superconducting wiggler insertion device of peak magnetic field 3.1 T. The vertical beam divergence from the X-ray source is reduced significantly by a collimating mirror. Subsequently the beam is selectively monochromated by a double Si(111) crystal monochromator with high energy resolution (DeltaE/E approximately 2 x 10(-4)) in the energy range 5-23 keV, or by a double Mo/B4C multilayer monochromator for 10-30 times higher flux ( approximately 10(11) photons s(-1)) in the 6-15 keV range. These two monochromators are incorporated into one rotating cradle for fast exchange. The monochromated beam is focused by a toroidal mirror with 1:1 focusing for a small beam divergence and a beam size of approximately 0.9 mm x 0.3 mm (horizontal x vertical) at the focus point located 26.5 m from the radiation source. A plane mirror installed after the toroidal mirror is selectively used to deflect the beam downwards for grazing-incidence SAXS (GISAXS) from liquid surfaces. Two online beam-position monitors separated by 8 m provide an efficient feedback control for an overall beam-position stability in the 10 microm range. The beam features measured, including the flux density, energy resolution, size and divergence, are consistent with those calculated using the ray-tracing program SHADOW. With the deflectable beam of relatively high energy resolution and high flux, the new beamline meets the requirements for a wide range of SAXS applications, including anomalous SAXS for multiphase nanoparticles (e.g. semiconductor core-shell quantum dots) and GISAXS from liquid surfaces.