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The Accelerator and Operational Physics (AOP) Group in the Accelerator Systems Division (ASD) provides electron beams of high-reliability and low-emittance to facilitate the productive X-ray Science program at the Advanced Photon Source (APS). The APS Upgrade (APS-U) is a Fourth Generation Storage Ring (4GSR) based on a multibend achromatic lattice design. This upgrade will reduce the beam emittance by two orders of magnitude and generate ultrabright x-rays for users. Concomitant with ultra-low emittance comes ultra-high energy and power densities in the electron beams. These beams must be safely handled in the event of beam trips. Experiments to study the effects of ultra-low emittance beams striking beam-facing surfaces have been conducted and demonstrated the damaging effects of beam dumps. Although experiments are useful, they are expensive. To this end, work is underway to investigate the effects of whole beam loss on beam-facing surfaces such as collimators and beam dumps using computer simulations.

The successful candidate will develop and perform computer simulations of high-energy-density (HED) electron beams as they interact with accelerator components during whole beam dump events expected to occur in the Advanced Photon Source Upgrade (APS-U) storage-ring (SR). Specifically, the candidate will examine the effects of HED beams striking horizontal collimators presently planned for the APS-U SR.

The effort will take advantage of the advanced computational facilities at Argonne National Laboratory such as the LCRC, and allow collaboration with the Mathematics and Sciences (MCS) Division.

Position Requirements

  • A Ph.D. degree in physics, applied math, computer science, and/or related disciplines obtained within the last three years.
  • Strong working knowledge of the FLASH code, a multi-physics (magneto)hydrodynamics scientific software system for astrophysics, plasma, and high-energy-density physics.
  • Solid knowledge in the development and use of the FLASH code.
  • A particular emphasis on a strong understanding and experience with defining and generating equations of state (EoS) for low-temperature, high-energy-densitey plasmas.
  • Ability to develop modern high-order numerical methods for solving partial differential equations.
  • Coupling of the particle-matter interaction program MARS with FLASH.
  • Developing methods necessary to convert density information generated by FLASH for input back into MARS where new dose maps will be generated.
  • Willingness to learn the accelerator dynamics code elegant and provide a method to integrate the code with FLASH and MARS providing a multi-physics simulation of the whole-beam dump event.
  • Utilizing computer resources provided by the Argonne National Laboratory’s LCRC facility as well as those available within the Accelerator Systems Division.