Paper | Title | Page |
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MOPO095 | A Risk Based Approach to Improving Beam Availability at an Accelerator Facility | 207 |
MOOP12 | use link to see paper's listing under its alternate paper code | |
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Funding: United States Department of Energy This paper describes a risk-based approach to improving beam availability at an accelerator facility. Los Alamos Neutron Science Center (LANSCE), like many other accelerator facilities, was built many years ago and has been re-purposed when new missions were adopted. Many of the upgrades to the accelerator and beamlines allowed improvements in the general area of the upgrade but large-scale, system-wide improvements were never accomplished. Because of this, the facility operates with a mix of old and new equipment of varying condition. Limited budgets have constrained spending for spares procurement making it vital to prioritize those items predicted to have the highest impact to availability, should they fail. A systematic approach is described where equipment is inventoried, condition assessed, rated for potential failure and finally compiled into a risk-based priority list. |
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Poster MOPO095 [0.332 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO095 | |
About • | paper received ※ 21 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019 | |
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MOPO096 | Realistic Modeling of MEBT for the New LANSCE RFQ Injector | 211 |
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The new RFQ-based proton injector at LANSCE requires a specialized medium-energy beam transfer (MEBT) after the RFQ at 750 keV due to a following long (~3 m) existing common transfer line that also transports H− beams to the DTL entrance. The horizontal space for MEBT elements is limited because two beam lines merge at 18-degree angle. The MEBT includes two compact quarter-wave RF bunchers and four short quadrupoles with steerers, all within the length of about 1 m. The beam size in the MEBT is large, comparable to the beam-pipe aperture, hence non-linear 3D fields at large radii and field-overlap effects become important. With CST Studio codes, we calculate buncher RF fields and quadrupole and steerer magnetic fields, and use them for particle-in-cell beam dynamics modeling of MEBT with realistic beam distributions from the RFQ. Our results indicate significant emittance growth in MEBT not predicted by the standard beam dynamics codes. Its origin is traced mainly to the quadrupole edge fields; the buncher RF fields also contribute noticeably. Proposed design modifications improve the MEBT performance. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO096 | |
About • | paper received ※ 10 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | |
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MOPO100 | Doubly Stripped Proton Causing Vacuum Leak at Brookhaven 200 MeV H− linac Complex | 214 |
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Doubly stripped H− in the low energy beam transport are capture 180 degree apart in the RF of RFQ and accelerated to the full energies. These protons are bend in the opposite direction of H− after the 200 MeV drift tube linac and caused vacuum leak. A new beam dump for these stripped protons is planned | ||
Poster MOPO100 [4.781 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO100 | |
About • | paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | |
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MOPO101 | LINAC-multitool - an Open Source Java-toolkit | 217 |
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Funding: Work supported by BMBF contr. No. 05P15RFRBA and HIC for FAIR Dedicating more precious time to advanced research instead of spending it towards timeconsuming routine tasks is a desirable goal in particle accelerator simulation and development. Requirements engineering was started at IAP in order to identify routine processes at our institute’s R&D that can be automated or simplified. Results indicated that there were several areas to consider: Bead pull measurements, data processing and visualization for the beam dynamics code LORASR, CST field map processing for the use with TraceWin, conversion between different particle distribution data formats and more. Subsequently development of the LINAC-Multitool started to rationalize these processes and replace preexisting scripts also to ensure consistency of results and increase transparency and reliability of computation. In order to guarantee maintainability, expandability and platform independence, LINAC-Multitool is programmed using Java and will be open source. This contribution presents the current state of development. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO101 | |
About • | paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | |
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FR1A05 | Development of Pulsed Gas Strippers for Intense Beams of Heavy and Intermediate Mass Ions | 982 |
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The GSI UNILAC together with SIS18 will serve as injector for the future FAIR. A modified 1.4~MeV/u gas stripper setup has been developed, aiming at an increased yield into the particular desired charge state. The setup delivers short pulses of high gas density in synchronization with the beam pulse. This provides a higher gas density. Different gases as stripping targets were tested. Measurements with various isotopes and gas densities were conducted to investigate the stripping properties. High intensity beams of 238U4+ were successfully stripped using hydrogen as stripping gas. The stripping efficiency was significantly increased while the beam quality remained suitable. The new stripper setup and major results achieved during the development are presented. Problems with the fast valves arose while they were used for a longer duration. Another revision of the setup took place to exchange the valves. In parallel, the installation of the required infrastructure for regular operation of the gas stripper using hydrogen was planned. | ||
Slides FR1A05 [10.013 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-FR1A05 | |
About • | paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | |
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