| Paper | Title | Other Keywords | Page |
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| TUPMW003 | Integration, Configuration and Coordination: from Project to Reality, at CERN | ECR, database, laser, status | 1407 |
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| The rigorous process in place at CERN to approve and follow-up the implementation of any modification of the LHC machine and its Injectors is presented in this paper. Our methodology implies the support of three teams, in charge of the configuration management, the scheduling and safety coordination, and the 3D integration studies. At each stage of the project the support of the three teams evolves, to provide the adequate support in the preparation phase and during the technical stops and long shutdowns. The formal roles and the processes used to govern the interaction of the Integration, Configuration and Coordination teams, and their relation to the project teams during the preparation and implementation phases, for activities to be performed in LHC and its injector chain are described and discussed. | |||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW003 | ||
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| WEPMB024 | Study on Nondestructive Inspections for Super-conducting Cavity | cavity, cryogenics, interface, radiation | 2174 |
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Funding: The work is supported by Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan. We have been studying nondestructive inspections for super-conducting spoke cavities. The temperature mapping (T-map) and X-ray mapping (X-map) are powerful inspection methods to locate a hot spot during the vertical RF tests. There would be a defect under the hot spot and the defect may be the cause of a quench. Our XT-map system (a combined system of T-map and X-map) has a high resolution in space. Because the huge amount of sensor signals are multiplexed at a hi-speed scanning rate in the vicinity of the sensors, the small number of signal lines makes the installation process easy and reduces the system complexity. Our XT-map got useful results on finding a defect in vertical RF tests of International Linear collider super-conducting cavity. The XT-map system is useful as low cost nondestructive inspections for superconducting spoke cavity. The study will be reported. progresses will be reported. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB024 | ||
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| WEPMR009 | Magnetic Flux Expulsion Studies in Niobium SRF Cavities | cavity, niobium, cryomodule, background | 2277 |
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| With the recent discovery of nitrogen doping treatment for SRF cavities, ultra-high quality factors at medium accelerating fields are regularly achieved in vertical RF tests. To preserve these quality factors into the cryomodule, it is important to consider background magnetic fields, which can become trapped in the surface of the cavity during cooldown and cause Q0 degradation. Building on the recent discovery that spatial thermal gradients during cooldown can significantly improve expulsion of magnetic flux, a detailed study was performed of flux expulsion on two cavities with different furnace treatments that are cooled in magnetic fields amplitudes representative of what is expected in a realistic cryomodule. In this contribution, we summarize these cavity results, in order to improve understanding of the impact of flux expulsion on cavity performance. | |||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR009 | ||
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| WEPMR058 | Survey and Alignment for Taiwan Photon Source Storage Ring | storage-ring, network, alignment, insertion | 2405 |
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| The Taiwan Photon Source (TPS) is a 3 Gev synchrotron light source located in Hsinchu, Taiwan. The commissioning of the beam began on December 2014, and the phase 1 stored current of 100mA was achieved on March 2015. Then the installation and alignment of insertion device were complete during the shutdown from April to July, and also the scheduled maintenance of survey control points was complete in the meantime. This report presents survey alignment results and experience of the TPS . | |||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR058 | ||
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| THPMY017 | A Comparison of Surface Properties of Metallic Thin Film Photocathodes | electron, laser, vacuum, cathode | 3691 |
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| In this work physical vapour deposition magnetron sputtering has been employed to deposit metallic thin films onto Cu, Mo and Si substrates. The use of metallic thin films offers several advantages: (i) metal photocathodes present a fast response time and a relative insensitivity to the vacuum environment (ii) metallic thin films when prepared and transferred in vacuum can offer smoother and cleaner cathode surfaces. The photocathodes developed here will ultimately be used to drive NCRF guns such as that used in VELA and the proposed CLARA light source test facility. The samples grown on Si substrates were used to investigate the morphology and thickness of the film. The samples grown onto Cu and Mo substrates were analysed and tested as photocathodes in a surface characterisation chamber, where X-Ray photoelectron spectroscopy was employed to determine surface chemistry and a Kelvin probe apparatus used to determine work function. QE measurements were enabled using a 266 nm UV laser. | |||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY017 | ||
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| THPMY028 | Technical Overview of the PAL-XFEL Conventional Facility | undulator, site, simulation, linac | 3715 |
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| Pohang Accelerator Laboratory (PAL) has finished construction of a 1,110m long 10GeV X-ray free electron laser (XFEL) linear accelerator building in FY2015. In order to secure high-sensitive of XFEL accelerating devices, more advanced and well proven technologies were adopted in the design of the building. These are the ground improvement underneath the tunnel and tunnel structure itself against the possible ground deformation, air conditioning system to maintain the temperature and humidity in the tolerable ranges and architectural zoning. In this paper we describe the features of design and construction of the XFEL accelerator building. | |||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY028 | ||
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