Title: Modeling High-Energy-Density Conditions in Accelerators

Speaker: Austin Jacob (AJ) Dick

Time: Thursday, February 27 at 4PM ET/3PM CST

Abstract: The high-brightness beams being produced in current and future accelerators present new machine protection concerns with the potential for high-energy-density conditions (>100 J/mm^3) in beam-intercepting components.  We present a method for coupling particle dynamics, particle-matter interaction, and hydrodynamics codes to model the effects of high-intensity electron beams in APS-U and other accelerators. These codes, elegant, FLUKA, and FLASH respectively, are used to simulate the dynamics of an electron beam and collimator during a full beam loss in the APS-U storage ring. Starting with a circulating beam in elegant, the rf system is muted and the beam gradually loses energy before colliding with a horizontal collimator.  The interaction and thermodynamic evolution of the collimator material are then modeled in FLUKA and FLASH before the surviving beam distribution is returned to elegant. This coupled framework is used to study damage mitigation techniques for beam-collimator interactions and can also be used to examine the generation and absorption of synchrotron radiation within the vacuum beam chambers.

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Title: C-band high gradient research and facilities at Los Alamos National Laboratory
Abstract: This presentation will talk about two C-band test facilities at Los Alamos National Laboratory (LANL): C-band Engineering Research Facility in New Mexico (CERF-NM), and Cathodes and Rf Interactions in Extremes (CARIE). Modern applications such as X-ray sources require accelerators with optimized cost of construction and operation, naturally calling for high-gradient acceleration. At LANL we commissioned a high gradient test stand powered by a 50 MW, 5.712 GHz Canon klystron. The test stand is capable of conditioning accelerating cavities for operation at surface electric fields in excess of 300 MV/m. CERF-NM is the first high gradient C-band test facility in the United States. CERF-NM was fully commissioned in 2021. The construction of CARIE began in October of 2022. CARIE will house a high gradient copper RF photoinjector with a cathode insert for testing high quantum-efficiency photocathodes at high accelerating gradients.  The construction of CARIE is currently in process with another Canon klystron being installed and conditioned, followed by a high power C-band circulator, and a waveguide line. The all-copper RF photoinjector has been fabricated and will be installed this Spring. The injector with a cathode insert has been designed and is currently in fabrication.