| Paper | Title | Other Keywords | Page |
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| TUPE02 | Experimental Validated CFD Analysis on Helium Discharge | ion, simulation, experiment, SRF | 156 |
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| National Synchrotron Radiation Research Center in Taiwan (NSRRC) had set up three cryogenic systems to provide liquid helium to superconducting radio-frequency (SRF) cavities, insertion devices, and highly brilliant hard X-ray. The first one could produce liquid helium 134 LPH, with maximum cooling capacity of 469 W at 4.5 K. The second one could produce liquid helium 138 LPH, with maximum cooling capacity of 475 W at 4.5 K. The third one could produce liquid helium 239 LPH, with maximum cooling capacity of 890 W at 4.5 K. However, large liquid helium discharge in a closed space will cause personnel danger of lack of oxygen. We performed Computational Fluid Dynamic (CFD) simulation to analyse helium discharge through a SRF cavity in the Taiwan Light Source (TPS) tunnel. We simulated cases of helium discharge flow rates from 0.1 kg/s to 4.2 kg/s with and without fresh air supplied from the air conditioning system. We also set up both physical and numerical models within a space of 2.4m in length, 1.2m in width and 0.8m in height with nitrogen discharge inside to validate the CFD simulation. | |||
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Poster TUPE02 [0.671 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE02 | ||
| About • | paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017 | ||
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| TUPE10 | A Thermal Exploration of Different Monochromator Crystal Designs | ion, lattice, synchrotron, synchrotron-radiation | 176 |
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| Eight potential monochromator crystal designs were subjected to a combination of three different beam powers on two different footprints. The temperature and thermal deformation were determined for each. It was found that thermal deformation of the lattice is negligible compared to the surface curvature, and that while the thinnest crystal wafer showed the smallest temperature increase, crystals cooled from the bottom alone demonstrated a far more uniform thermal deformation and a larger radius of curvature. | |||
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Poster TUPE10 [3.411 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE10 | ||
| About • | paper received ※ 10 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017 | ||
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| TUPE21 | CLSI BMIT’s Super-Conducting Wiggler Cryogenic Safety Improvements* | ion, wiggler, operation, vacuum | 209 |
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4.1 T superconducting (SC) wiggler on CLS Biomedical Imaging and Therapy (BMIT) beamline [1-4] developed a critical problem in the cryogenic safety relief and refill paths. Ice blockage formed and prevented helium gas from relieving during liquid helium (LHe) refill. This resulted in an internal pressure built up, which caused expelling of the LHe and cold gas helium (GHe) from the wiggler cryostat. Several improvements were performed over the years including replacement of the original rupture disk, the pressure relief valves and installation of metal O-ring seals at external ports. Following these improvements, a major upgrade on the wiggler safety relief path was implemented by adding a new vent pipe directly connected to the cryostat for safety exhaust. The LHe refill path was also modified to eliminate possibility of ice blockage. During initial tests after the up-grades, we experienced significant heat load increase which was linked to the thermal acoustic oscillations in the LHe transfer line. The problem was resolved by improving the insulation vacuum in the transfer line and adding a super insulation assembly into the direct vent pipe along with a plug at the refill path.
*Work supported by Budker Institute of Nuclear Physics under contract No. C60109-029 ¿ Linda. Lin@lightsource.ca |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE21 | ||
| About • | paper received ※ 08 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017 | ||
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| TUPE41 | Design and Development of a System of Hybrid Type to Measure the Magnetic Field of a Cryogenic Undulator | ion, vacuum, undulator, controls | 251 |
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| Cryogenic permanent-magnet undulators (CU) have currently become the most important scheme serving as sources of hard X-rays in medium-energy facilities worldwide. One such set (length 2 m, period length 15 mm) is under development for Taiwan Photon Source (TPS). To obtain a magnetic-field distribution of the cryogenic undulator after it is cooled to an operating target temperature below 80 K, a device of hybrid type combining a Hall probe and stretched-wire method has been designed and developed, to perform the field measurement at low temperature and in an ultra-high vacuum environment. The Hall probe is used to measure the field on axis in the transverse and vertical directions; the stretched wire is utilized to measure the field integral in the vertical and horizontal directions in the horizontal plane. Unlike a conventional field-measurement system in air, this innovative system must be located in an ultra-high vacuum environment with limited clearance. This paper describes mainly the entire system, including kernel components, control systems and preliminary test results in detail. | |||
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Poster TUPE41 [1.374 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE41 | ||
| About • | paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017 | ||
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| THAA02 | Mechanical Engineering of a Cryo STXM at CLS | ion, vacuum, laser, radiation | 381 |
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| A Scanning Transmission X-ray Microscope (STXM) is a useful imaging tool, but its application to certain types of samples is limited by significant rates of x-ray damage to the sample. Cooling samples to liquid nitrogen temperatures can delay radiation damage, but must be done in a vacuum environment to prevent rapid formation of ice on the sample. The Canadian Light Source (CLS) has constructed a Cryo-STXM, which can maintain sample temperatures at 100 K in an ultra-high vacuum environment and rotate the samples in the beam to collect tomographic data sets. This presentation will discuss the mechanical engineering aspects of the development of this Cryo-STXM including the finite element analysis (FEA) for stresses and vibrations, and present the performance parameters being achieved by the instrument. | |||
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Slides THAA02 [4.645 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-THAA02 | ||
| About • | paper received ※ 11 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017 | ||
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| FRAA01 | Engineering Challenges on the I14 Nanoprobe Beamline | ion, vacuum, detector, optics | 398 |
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| An overview of the double branch 185m I14 Nano-probe beam-line under construction at DLS will be presented together with the end-station design in further detail. The end station consists of a split vacuum vessel containing a KB mirror configuration (at UHV) and the sample environment (at HV) which is just 50mm from the end of the final KB optic. An in-vacuum detector is mounted between the KB and the sample whilst two externally mounted detectors will operate between 0.25m & 3m from the sample. Four cryogenic samples can be brought into the vessel at a time and transferred remotely to the sample position with cooling provided by a Helium pulse tube cooler. With an initial 50nm size beam, stability is absolutely critical and careful attention has been paid in the design to mitigate any thermal and structural sources of vibration. An array of interferometers reference the KB mirrors and sample position and will be used to actively correct for any drifts. The very tight space constraints involved have greatly increased the complexity and duration of the design but testing of prototypes is now underway. The system is scheduled for build and test through the Autumn 2016. | |||
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Slides FRAA01 [15.581 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-FRAA01 | ||
| About • | paper received ※ 09 September 2016 paper accepted ※ 23 September 2016 issue date ※ 22 June 2017 | ||
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| FRBA01 | A New Crystal Bender for the ID31 Laue-Laue Monochromator | ion, SRF, controls, vacuum | 409 |
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| The ID31 beamline is able to provide X-Ray energies ranging from 20 to 150keV. The energy range 50-150keVis covered by a Laue-Laue monochromator located at 100meters from the source. Two asymmetrically cut Si crystals equipped with benders, based on a new concept, provide an energy resolution ranging from few hundreds of eV down to the Darwin width of few eV. The bender principle, design, manufacture and first commissioning will be described. The virtual source, produced with a white beam transfocator, can be before or after the monochromator. Therefore the bending mechanism must allow both concave and convex configuration with bending radius from 20m to infinite. Each bender is equipped with two home made piezo-jacks in close loop with capacitive sensor. The system is liquid Nitrogen cooled. The thermal behaviour will be described in detail and thermo-mechanical finite element analysis presented. | |||
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Slides FRBA01 [11.565 MB] | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-FRBA01 | ||
| About • | paper received ※ 09 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||