Design of a superconducting multipole Wiggler for synchrotron radiation

A 3.2 Tesla superconducting multipole wiggler was designed and fabricated as an X-ray source. The magnet assembly, which consists of 32 pairs of racetrack NbTi superconducting coils with a periodic length of 60 mm, provides 28 effective poles. A 1.4056 m long elliptical cold-bore stainless steel beam duct with taper flanges and a wall thickness of 1 mm, was developed and constructed to fit the ultra-high vacuum condition for electron beam. The magnetic field strength was measured in liquid helium using a cryogenic Hall probe, revealing a field behavior very close to behavior consistent with the designed values. A Hall generator and the stretch wire methods are used to determine the transfer function of the peak field, the first and second integrated field distributions, and the good field region of the magnet. The quench protection of the magnet, the control algorithm for automatic filling of liquid helium, and the boil off rate of liquid helium and liquid nitrogen will also be discussed.

“…This magnet adopts the even-number pole design [1], to minimize the first integral. Poles and coils are impregnated with an aluminum block of the up and down magnet array, respectively.…”

Section: Design and Construction Of Components Of Magnetmentioning

confidence: 99%

Section: Design and Construction Of Components Of Magnetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Construction and Performance of a Superconducting Multipole Wiggler

Hwang¹

2004

“…To provide a world-competitive MAD capability, beamlines have been built on a high-field (3.2 T) superconducting magnet, multi-pole (28 effective poles) wiggler [1,2] that can illuminate up to three beamlines for simultaneous use. This field increases the critical energy from 2.14 keV for a 1.25 T normal conducting magnet to 4.82 keV.…”

Section: Introductionmentioning

confidence: 99%

Performance of the High-Throughput Protein Crystallography Beamline BL13B1 at the NSRRC

Jean¹,

Chao²,

Huang³

et al. 2007

A high-throughput Protein Crystallography beamline BL13B1 was constructed on a high-field (3.2 T) superconducting magnet, multi-pole (28 effective poles) wiggler (SW6) fan of the NSRRC storage ring. This field increase the critical energy from 2.14 keV for a 1.25 T normal conducting magnet to 4.82 keV. The 28 poles device, of period 60 mm, is capable to provide an intense X-ray beam up to 19 keV that allows a hard x-ray program to be developed on the relatively low energy National Synchrotron Radiation Research Center (NSRRC) ring (1.5 GeV). BL13B1 operates over the energy range from 6.5 keV to 19 keV (1.92 angstrom to 0.65 angstrom). Optimized for MAD experiments, it is also suitable for monochromatic crystallography. The principal components of the beamline include a front end, vertically collimating premirror, double-crystal silicon (111) monochromator with a fixed-height exit beam, and a toroidal focusing mirror. The end station is equipped with a state-of-the-art ADSC Quantum315 CCD area detector, a high precision single-phi axis goniometer, a sample cooling system (-100 K), a robotic sample changer for automatically sample mounting and centering, user-friendly data acquisition software (BLU-ICE), and powerful data processing software (HKL2000). The design and performance characteristics of this beamline will be described.

“…Four superconducting cavities occupy two long straight sections and maintain the energy level of the electrons. Superconducting insertion magnets located at the remaining straight sections are the major devices providing the desired photon energy with high brilliance and flux [2]. All the superconducting devices require liquid helium for normal operation and the goal of their cryogenic system is to supply enough cooling power to maintain the helium levels of the cryostats.…”

Section: Introductionmentioning

confidence: 99%

The Helium Cryogenic System for the Taiwan Photon Source

Hsiao¹,

Li²,

Chang³

et al. 2006

At NSRRC, an electron accelerator with a beam current of 400 mA at 3 GeV and an emittance of 2 nm-rad is under planning. Four superconducting cavities are required to keep the electron energy in the storage ring and superconducting insertion magnets are used as the major devices providing the desired photon energy with high brilliance and flux. This paper shows the design features of the helium cryogenic system for superconducting devices. The cryogenic system consists of two cryogenic plants each with 450 W at 4.5 K for the cavities and one cryogenic plant with 600 W at 4.5 K for the magnets. Redundancy is achieved by switching valves and interconnection piping between the three cryogenic plants. Distribution of the liquid helium to the superconducting magnets is planned via two 250 m multichannel lines with up to 24 supplying ports for the candidate positions of superconducting magnets.