Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session K04: Low Emittance Storage RingsInvited
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Sponsoring Units: DPB Chair: Camille Ginsburg, Jefferson Lab/Jefferson Science Associat Room: MG Salon C - 3rd Floor |
Sunday, April 16, 2023 3:45PM - 4:21PM |
K04.00001: Ion Instabilities in Low Emittance Storage Rings Invited Speaker: Joseph Calvey Ion trapping occurs when a negatively charged beam ionizes residual gas inside an accelerator vacuum chamber, and the resulting ions become trapped in the beam's potential. These ions can cause a variety of undesirable effects, including instability and emittance growth. Ion trapping is of particular concern for next-generation electron storage rings, such as the upcoming Advanced Photon Source Upgrade (APS-U), because of their challenging emittance and stability requirements. Ion instability has been studied experimentally in the present APS using a gas injection system. This system was designed to create a controlled pressure bump of Nitrogen gas, so that the resulting instability could be studied in detail. In particular, the growth of individual unstable modes has been measured using a bunch-by-bunch feedback system. In addition, the particle tracking code ELEGANT was enhanced to permit modeling both the coherent and incoherent aspects of the ion instability. This code has been used to better understand the results of the gas injection experiments, and to develop a plan for mitigating the ion instability in the APS-U. |
Sunday, April 16, 2023 4:21PM - 4:57PM |
K04.00002: Road to diffraction limited storage rings - an overview of fourth-generation synchrotron light sources Invited Speaker: Xiaobiao Huang A revolution is ongoing within the synchrotron light source community since the last decade. Almost all major facilities are undergoing or planning a major upgrade to build new storage rings based on multi-bend-achromat (MBA) lattices, which would increase the photon beam brightness by two to three orders of magnitude. This talk will give an overview of the accelerator physics aspects of development in this area, with coverage of the enabling technologies, beam dynamics challenges, lattice design strategies, and design optimization techniques. Special emphasis is given to the hybrid 6-bend achromat (H6BA) lattice, which was recently proposed for diffraction limited storage ring light sources. Lattice options for Stanford Synchrotron Radiation Lightsource (SSRL) based on H6BA will be shown as an illustration of its amazing features. |
Sunday, April 16, 2023 4:57PM - 5:33PM |
K04.00003: Beam Diagnostics for Ultra-Low Emittance Storage Rings Invited Speaker: Volker Schlott Multi-bend achromat (MBA) lattices have enabled the realization of ultra-low emittance storage rings as diffraction-limited synchrotron radiation sources providing much higher photon brilliance and coherence in the wavelength range of hard x-rays than third generation user facilities. While advances in technology and continuous upgrading of state-of-the-art diagnostics systems have already led to outstanding performance levels of beam instrumentation at present light sources, more stringent demands on beam stability and control induce a number of technical improvements and stimulate advanced concepts of combining electron and photon beam-based signals. Based on diagnostics requirements for diffraction-limited light sources, this talk will give an overview of new electron and photon beam instrumentation developments and highlight beam stabilization concepts aiming for the exploitation of the full capacity of fourth generation synchrotron radiation user facilities. |
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