| Paper |
Title |
Page |
| MOPAN091 |
Design of Mechanical Structure and Cryostat for IASW Superconducting Wiggler at NSRRC
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374 |
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- H.-H. Chen, C.-H. Chang, T.-C. Fan, M.-H. Huang, C.-S. Hwang, J. C. Jan, F.-Y. Lin
NSRRC, Hsinchu
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An in-achromatic superconducting wiggler (IASW) was successfully constructed and installed at the Taiwan Light Source (TLS) in January 2006. The cryostat with a 30 L liquid nitrogen aluminum reservoir shielding surrounds the helium vessel, which comprises the cold mass and 100 L liquid helium. The helium vessel is suspended by eight suspension links, which are thermally intercepted at 80 K and can be adjusted by applying tension, such that the center of the cold mass does not move during cooled to 4.2 K. A three-layered stainless tube was designed to prevent the transfer port from freezing and the steam- electricity separation system is designed to supply electricity and return the helium gas to prevent freezing of the power feedthrough.
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| MOPAN095 |
Design of the Precise Unit for the Rotating Coil Measurement System
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386 |
| |
- J. C. Jan, C.-H. Chang, J. W. Chen, T.-C. Fan, C.-S. Hwang, F.-Y. Lin
NSRRC, Hsinchu
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A precise rotating coil measurement system (RCS) is developed to characterize the magnetic field quality of the quadrupole (QM) and sextupole (SM) magnets in the Taiwan Photon Source (TPS). A measurement bench is designed to install the magnets easily and mount the rotating coil unit with high reproducibility. The Fiberglass Reinforced Epoxy (FRP) measurement unit (F-unit) exhibits a large sag and mechanical error while it is 880mm long. Therefore, a new graphite measurement unit (G-unit) with a printed circuit coil is adopted to reduce these errors. The rotating coil design and testing using a QM are also described.
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| MOPAN100 |
Multiple Quadrupole Magnetic Center Alignment on the Girder
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395 |
| |
- L. Tsai, T.-C. Fan, C.-S. Hwang, C. J. Lin, S. Y. Perng, D.-J. Wang
NSRRC, Hsinchu
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Conventional alignments of quadrupole magnets on the girder based on the theodolite and fiducial was limited by human-eye resolution and fiducial precision. The accumulative error of group of magnetic centers may be more than 100 μm. In this paper, an automatic quadrupole magnetic center aligning method was proposed using pulsed wire method to align group of quadrupole magnets concentrically on one girder to higher precision. In order to increase the alignment precision, a short wire reduced sag problem in long wire, laser and position sensitive detector (PSD) system was to trace the wire position to level of micron. The precision of the alignment of quadrupole magnetic centers could be within 30μm. Descriptions of the setup and test results are presented.
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| TUPMN070 |
Magnet Block Arrangements for the Apple-II Elliptically Polarized Undulator
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1079 |
| |
- C.-S. Hwang, C.-H. Chang, M.-H. Huang, P. H. Lin
NSRRC, Hsinchu
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The good field region (magnetic field roll-off) of the horizontal and vertical field distribution in the elliptically polarized undulator (EPU) of the APPLE II structure is too short. Meanwhile, the strong force variation will be created between the magnet arrays on different phase. Hence, a magnet block was magnetized with an tilt angle has been studied to enlarge the good field region and a different arrangement of magnet block module is used to reduce the force variation. In addition, the pure and hybrid structure of the EPU with different end pole design has been studied. This study will obtain a small variation of the first and second field integral on different gap and phase. This work will report the scheme of the magnet block arrangement and the end pole design for the APPLE II elliptically polarized undulator.
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| TUPMN071 |
Planning of Insertion Devices for 3 GeV Taiwan Photon Source
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1082 |
| |
- C.-S. Hwang
NSRRC, Hsinchu
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The Taiwan Photon Source (TPS) has 24 straight sections (10.9 m x6,5.7 m x18). It has at least three long straight and 18 medium straight for installing insertion devices. Most of the insertion devices are the in-vacuum undulator and produce intense X-rays with a brilliance of up to 1x1020 photons/s/mr2/mm2/0.1%bw. However, the cryogenic permanent magnet undulator with a periodic length of 1.8 cm (CU1.8) will be developed to provide an energy over 20 keV. One or two types of undulators can be installed in the long straight section to provide low photon energy or enable experiments to be conducted in situ in a single beam line. Meanwhile, some elliptically polarized undulators (APPLE II structure) are planned to provide circular and any linear polarization light. One or two superconducting wigglers with a field strength of 3.5 T will be used to yield the photons with energies of over 25 keV. A study project of superconducting undulator is for the energies of 2.5 - 25 keV. This work will report the design philosophy for the insertion devices and what kinds of insertion devices will be operated at TPS.
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