Paper | Title | Other Keywords | Page |
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MOPMB043 | Preliminary Research of HLS II BLM System | storage-ring, vacuum, detector, operation | 190 |
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Beam loss monitor system has been designed in many electron storages in order to indirectly measure lost electrons, which can be used to analysis beam loss mechanism and beam life. It can contribute to beam commissioning and improving stable operation of storage ring. According to lattice structure of the HLS II storage ring, 64 beam loss detectors have been located in the upper, lower, inner, outer side surfaces of vacuum chamber in the HLS II storage ring. Some preliminary researches based on the HLS II BLM system have been done. The results in successfully stable operation and unsuccessfully stable operation in beam commissioning stage were compared. Analysis of a sudden lost beam phenomenon were carried out. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB043 | ||
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MOPMW032 | Study of RF Breakdown in 805MHz Pillbox Modular Cavity in Strong Magnetic Field | cavity, operation, radiation, pick-up | 466 |
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RF breakdown has a negative impact on a cavity's performance, especially with the presence of strong magnetic fields. This issue can arise in designs of muon ionization cooling channel, RF guns, klystrons and in many other applications. The MuCool Test Area at Fermilab is the facility that allows us to study the effects of static magnetic field on RF cavity operation. As a part of this research program, we have tested an 805MHz pillbox "modular" cavity in strong external magnetic fields. The design of the cavity allowed for a better control over sources of systematic error. "Modular" structure of the cavity enables easy dismounting of the endplates to perform inspection of inner surfaces after each run as well as swapping endplates to study the effects of various materials on breakdown phenomenon. Coupler design ensures maximum electric field enhancement on cavity axis, thus reducing breakdown probability in the coupler region. The results and analysis from high-power runs with zero and non-zero external magnetic fields will be presented. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW032 | ||
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TUPOY029 | Gem*Star Consortium Proposal to Build a Demonstration Accelerator Driven System | operation, target, proton, neutron | 1973 |
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The GEM*STAR Consortium of four companies, two universities, and two US national laboratories has formed Mu*STAR, a new company, to fund and build a profitable pilot plant to demonstrate the advantages of subcritical molten-salt-fueled nuclear reactors driven by superconducting RF proton linacs. The GEM*STAR multipurpose reactor design features new accelerator power capabilities, an internal spallation neutron target, and high temperature molten salt fuel with continuous purging of volatile radioactive fission products such that the reactor contains less than a critical mass and almost a million times fewer volatile radioactive fission products than conventional reactors. GEM*STAR is a reactor that without redesign will burn spent nuclear fuel (SNF), natural uranium, thorium, or surplus weapons material. It will operate without the need for a critical core, fuel enrichment, or reprocessing, making it an excellent design overall, and a strong candidate for export. We describe the design and plans for funding a pilot plant that could profitably dispose of excess weapons-grade plutonium. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY029 | ||
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TUPOY047 | Development of a Non-destructive Inspection System for Industrial and Societal Infrastructures with 950 keV/3.95 MeV Portable X-band Linac-based X-ray | linac, experiment, radiation, distributed | 2011 |
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Advanced maintenance for aging industrial and societal infrastructures such as chemical plant and bridge are strongly needed recently. For the purpose, we are developing, applying and upgrading the 950 keV/3.95 MeV X-band linac X-ray sources for the on-site inspection. Less than 1 MeV accelerators are available for on-site inspection and less than 3.95 MeV accelerators are allowable for only bridge on-site inspection. These systems can visualize in seconds inner states of infrastructures, such as crack of concrete, iron-reinforced rod/wire and other imperfections. By using the 950 keV system, we conducted the first inspection of the real bridge and evaluated degradation of pre-stressed concrete wires. We also demonstrated first on-site use of the 3.95 MeV system in Japan in 2015. We are also performing structural analysis to evaluate the degradation of strength. For more precise evaluation, we are going to carry out a partial angle CT to reconstruct a two-dimensional inner structure. We are going to present the results and strategy of degradation evaluation of the industrial and societal infrastructures by the 950 keV / 3.95 MeV X-ray sources. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY047 | ||
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TUPOY053 | In-Kind Contributions: A Prosperous Model of Procurement for Large-scale Science Projects | interface, controls, vacuum, experiment | 2017 |
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The number of research infrastructures which are being built with significant amount of In-Kind Contributions (IKCs) from partners and stakeholders is on the increase. One of the main advantages of the utilization of IKCs in big science projects is to enable numerous partners with technological and scientific know-how participate directly in such projects. Thus, IKCs promote capacity building in technology and knowledge transfer of these partners. However, management and execution of IKCs are particularly challenging. The 2nd In-Kind Contributions Workshop (IKCW 2015) was organized by the Facility for Antiproton and Ion Research in Europe (FAIR) with the aim of sharing experiences on the procurement and management of large-scale international science projects through IKCs. This paper focuses on the analysis of the issues pertaining to how to best implement and execute IKCs from the initial phase of assignment until full delivery for both accelerator and experiments. Discussions held during IKCW 2015 are used to highlight these points further. The goal of this paper is to present the reader with a synopsis of the challenges and opportunities faced in procurement through IKCs. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY053 | ||
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WEPMB006 | XFEL Couplers RF Conditioning at LAL | vacuum, pick-up, electron, controls | 2125 |
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The industrialization and the RF conditioning of 800 power couplers for the European XFEL have been performed by LAL-Orsay from fall 2013 to spring 2016. LAL laboratory has in charge the industrial monitoring, the quality control and the RF conditioning of the couplers fabricated by two different suppliers. It was the first experience of coupler production at such scale. The faced challenges, the different issues, and the lessons learned during the mass production will be reported. And finally the huge amount of RF conditioning data will be shown as one of key point on the conditioning process. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB006 | ||
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WEPMR026 | RF Losses from Trapped Flux in SRF Cavities | cavity, vacuum, SRF, niobium | 2327 |
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Funding: NSF Previous measurements at Cornell have shown that the sensitivity of residual resistance to trapped magnetic field in SRF cavities is heavily dependent on the mean free path of the RF penetration layer of the niobium. Here we report on a systematic study of ten cavity preparations with different mean free paths and the effect of these preparations on sensitivity to trapped magnetic flux. In the clean limit, longer mean free path leads to a lower sensitivity to trapped magnetic flux while in the dirty limit the opposite is true, shorter mean free path leads to lower sensitivity. These results are also shown to be in good agreement with theoretical predictions of RF losses due to oscillations of vortex lines. |
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DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR026 | ||
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WEPMR033 | Observation of Stable Low Surface Resistance in Large-Grain Niobium SRF Cavities | cavity, niobium, SRF, vacuum | 2344 |
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Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. Low surface resistance, or high unloaded quality factor (Q0), superconducting radio frequency (SRF) cavities are being pursued actively nowadays as their application in large-scale CW SRF accelerators can save capital and operational cost in cryogenics. There are different options in realization of such cavities. One of them is the large-grain (LG) niobium cavity. In this contribution, we present new experimental results in evaluation of LG niobium cavities cooled down in the presence of an external magnetic field. High Q0 values are achieved even with an ambient magnetic field of up to 100 mG. More over, it is observed that these high Q0 values are super-robust against repeated quench, literally not affected at all after the cavity being deliberately quenched for hundreds of times in the presence of an ambient magnetic field of up to 200 mG. |
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DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR033 | ||
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WEPMY041 | Development of Mobile Neutron Sources Driven by X-Band Electron Linacs for Infrastructure Maintenance and Nuclear Security | neutron, electron, target, linac | 2648 |
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We are developing a compact neutron source with a 3.95 MeV X-band (9.3 GHz) electron linac based X-ray source. The X-ray source, which included a tungsten target for bremsstrahlung, was originally fabricated for on-site nondestructive inspections for infrastructures such as bridges, expressways and tunnels. Attachment of a photo-neutron target to this X-ray source allows a new mobile neutron source. Main applications of this neutron source are on-site moisture detection in infrastructures, and nuclear materials measurement in fuel debris for decommissioning Fukushima nuclear power plants. Our approach also realizes a mobile X-ray/neutron hybrid source system in the future. The beryllium was employed as target material since it had especially small threshold energy for the photo neutron production. We have developed a 60-cm-cube target station by combining a beryllium block, a graphite reflector, a polyethylene moderator, a boric acid resin layer (neutron shied), and a lead layer (gamma-ray shield). This presentation will report a pilot experiment of neutron generation and discuss the results compared to a Monte Carlo simulation. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY041 | ||
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WEPOR022 | Residual Radiation Measurements at J-PARC MR Using the ASTROCAM 7000HS Newly Developed Radioactive Substance Visualization Camera | radiation, scattering, controls, electron | 2719 |
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Mitsubishi Heavy Industries, Ltd. (MHI) released the ASTROCAM 7000HS, a radioactive substance visualization camera. The ASTROCAM 7000HS incorporates the technologies for the gamma-ray detector used for the ASTRO-H satellite, which MHI has been developing under entrustment from and together with scientists at the Institute of Space and Astronautical Science (ISAS) at the Japan Aerospace Exploration Agency (JAXA), and the design was modified for use on land to commercialize the product. MHI and Mitsubishi Heavy Industries Mechatronics Systems, Ltd. (MHI-MS) performed on-site residual radiation measurements at the 50 GeV Main Ring (MR) of the Japan Proton Accelerator Research Complex (J-PARC) under collaboration with the High Energy Accelerator Research Organization (KEK) and the Japan Atomic Energy Agency (JAEA) and succeeded visualization of radiation hot spots of the accelerator components. The outline of the ASTROCAM 7000HS, the measurement principle and the first measurement results at the J-PARC MR are described. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR022 | ||
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WEPOR049 | Jupyterhub at the ESS. An Interactive Python Computing Environment for Scientists and Engineers | software, controls, monitoring, simulation | 2778 |
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The European Spallation Source will be the world's most powerful neutron source, once its construction is finished. In order to design, build and operate this complex machine many different software components and frameworks will be needed. One of those is Jupyterhub, a scripting environment for data analysis, scientific computing and physics simulations. Jupyterhub is a multiuser version of the IPython notebook (Jupyter) that can be deployed in a centralized server; It provides centralized authentication, centralized deployment, promotes collaboration and provides access to the most advanced libraries for data cleaning and transformation, simulation and statistics. At the Integrated Controls System Division a customized version of Jupyterhub was deployed, providing sandboxed environments to users using Docker containers. Among other characteristics of this installation we can find: clustering, load balancing, A/B testing, Amazon Web Services integration, nbviewer and OpenXAL integration. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR049 | ||
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WEPOY042 | Open XAL Status Report 2016 | linac, operation, software, ion | 3083 |
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Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy. Formed in 2010, the Open XAL accelerator physics software platform was developed through an international collaboration among several facilities to establish it as a standard for accelerator physics software. While active development continues, the project has now matured. This paper presents the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility. |
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DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY042 | ||
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THEA01 | Learn to Read Korean: An Introduction to the Hangul Alphabet | factory, ion, insertion, distributed | 3207 |
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In the mid 15th century the Korean scholar-king Sejong invented Hangul, the native Korean alphabet. This was the beginning of a long process by which Hangul has gradually supplanted Chinese characters as Korea's primary script, a process which is still ongoing today. This presentation will introduce the historical and cultural background behind the invention of Hangul and describe the systematic linguistic principles on which it is based. The 1446 text that introduced Hangul proclaimed that it was so simple that "a wise man can master it in a morning, and even a stupid person can learn it in ten days." We will put this claim to the test by attempting to learn to read Korean during the 30-minute presentation. | |||
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Slides THEA01 [14.724 MB] | ||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THEA01 | ||
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THPMY025 | Mechanical Integration of the IFMIF-EVEDA Radio Frequency Quadrupole | rfq, vacuum, interface, alignment | 3712 |
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The Linear IFMIF Prototype Accelerator, the high intensity deuteron linac compact demonstrator of the IFMIF machine, is in an advanced installation phase at BA site (Rokkasho, Japan), within a European-Japan collaboration coordinated respectively by F4E and JAEA. The RFQ (5 Mev, 130 mA) is an Italian in-kind contribution under the responsibility of INFN. Is it a 9,8 m-long structure made of 18 modules, pre-assembled in three parts. The various aspects of the RFQ integration inside the LIPAc are presented here, with details about the various functional services of the RFQ, the different interfaces with other sub-components of the linac and with the building and the structural validation through the seismic analysis. Some peculiar aspects related to the installation of the RFQ are also detailed (i.e. the handling tooling, precise positioning jigs). | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY025 | ||
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THPMY028 | Technical Overview of the PAL-XFEL Conventional Facility | undulator, simulation, linac, survey | 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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THPOR026 | Change Management at the International Linear Collider ILC | detector, linear-collider, collider, controls | 3835 |
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The Linear Collider Collaboration has introduced a change management process to ensure that changes to the ILC baseline design are properly reviewed and implemented in an orderly fashion. A change management board oversees the process, establishes the review procedure based on the overall impact of the proposed change, decides, and monitors the implementation. This change management process has become an important factor that gives structure and direction to the ongoing design activities around the world. For example, one CR called for a harmonisation of the final focus quadrupole position between the two detector concepts; extensive studies from both experiments were carried out as part of the review process and took almost a year. Another CR by the experiments asked for a vertical shaft access to the interaction hall that required a relocation of the whole accelerator. The change process made sure that the stakeholders were part of the review and decision process from the beginning and contributed to a design change acceptable to all parties involved. The poster will present the change management process and give examples of change requests that have already been processed. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR026 | ||
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THPOW054 | Cumulative Damage of Ultrafast Laser Pulses | laser, vacuum, experiment, electron | 4066 |
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We demonstrate experimentally that damage threshold fluence (DTF) for fused silica changes with the number of femtosecond laser (10Hz 600Hz, 655 fs, 800nm) shots. Based on the experimental data we were able to develop a model which indicates that the change in DTF varies with number of shots logarithmically (lnp) up to a critical value. Above this value, DTF approaches an asymptotic value. Both DTF for a single shot and the asymptotic value as well as the critical value where this happens are extrinsic parameters dependent on the configuration (repetition rate, pressure and geometry near or at the surface). Indications are that the power of this dependence (p) is an intrinsic parameter independent of the configuration. | |||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW054 | ||
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