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MOPVA031 | Low Energy Compact Storage Ring Design for Compton Gamma-Ray Light Source | 921 |
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Gamma-ray sources with high flux and spectral densities are highly demanded by many nuclear experiments. We design a low energy compact storage ring to produce gamma-ray with energy in the range of 4-20 MeV based on Compton backscattering technique. The storage ring energy is 500-800 MeV with the circumference of about 59 m and natural emittance of about 3 nmrad at 500 MeV. In this paper, we present the storage ring lattice design and propose two collision configurations for Compton gamma-ray generation. Intrabeam scattering has been investigated which can increase emittance from 3 nmrad to 6 nmrad horizontally for 500 MeV ring. We also discuss how Compton scattering affects longitudinal and transverse beam dynamics by tracking macro particles using our parallel simulation code. Based on this study, we can further optimize our storage ring lattice design for the higher gamma-ray flux production. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA031 | |
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WEPAB101 | Lattice Optimization Using Jupyter Notebook on HPC Clusters | 2818 |
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Funding: Work supported by the Director Office of Science of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231 Tracy accelerator simulation library was originally developed for the Advanced Light Source (ALS) design studies at LBNL in the late 1980's. It was originally written in Pascal, later ported to C++, and then to C#. It is still actively updated and currently used by the ALS Upgrade Project (ALS-U) to design and to optimize the lattice. Recently, it has been reconstructed to provide ease of use and flexibility by leveraging the quickly growing Python language. This paper describes our effort of porting it to Jupyter Notebook on our institutional High-Performance Computing (HPC) clusters. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB101 | |
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WEPAB103 | On-Axis Swap-Out Injection R+D for ALS-U | 2821 |
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Funding: This work is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The ALS-U upgrade promises to deliver diffraction limited performance throughout the soft x-ray range by lowering the horizontal emittance by a factor of 40 compared to the current ALS. One of the consequences of producing a small emittance is a small dynamic aperture, although the momentum acceptance will remain large enough for acceptable beam lifetime. To overcome this challenge, ALS-U will use on-axis swap-out injection to exchange bunch trains between the storage ring and an accumulator ring. On-axis swapout injection requires special fast pulsers and state-of-the-art stripline kicker magnets. This paper reports on the results of the on-axis swap-out injection R&D program, including beam tests of a complete stripline kicker/pulser system on the current ALS and the development of methods to speed up beam based commissioning after the upgrade shutdown. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB103 | |
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WEPAB104 | Status of the Conceptual Design of ALS-U | 2824 |
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Funding: This work is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The ALS-U upgrade promises to deliver diffraction limited performance throughout the soft x-ray range by lowering the horizontal emittance to about 50~pm resulting in 2-3 orders of brightness increase for soft x-rays compared to the current ALS. The design utilizes a multi bend achromat lattice with on-axis swap-out injection and an accumulator ring. One central design goal is to install and commission ALS-U within a short dark period. This paper summarizes the status of the conceptual design of the accelerator, as well as some results of the R&D program that has been ongoing for the last 3 years. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB104 | |
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WEPAB105 | Design of the ALS-U Storage Ring Lattice | 2827 |
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Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory is proposing the upgrade of its synchrotron light source to reach soft x-ray diffraction limits within the present ALS footprint. The storage ring lattice design and optimization of this light source is one of the challenging aspects for this proposed upgrade. The candidate upgrade lattice needs not only to fulfill the physics design requirements such as brightness, injection efficiency and beam lifetime, but also to meet engineering constraints such as space limitations, maximum magnet strength as well as beamline port locations. In this paper, we will present the lattice design goals and choices and discuss the optimization approaches for the proposed ALS upgrade. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB105 | |
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