Author: Adelmann, A.
Paper Title Page
High-Fidelity Simulations and Machine Learning for Accelerator Design and Optimization  
  • D. Winklehner
    MIT, Cambridge, Massachusetts, USA
  • A. Adelmann
    PSI, Villigen PSI, Switzerland
  Funding: NSF #1505858, NSF #162606, NSF #1626069
Computation has become a critically important tool for particle accelerator design and optimization. Thanks to massively parallel codes running on high-performance clusters, we can now accurately predict emergent properties of particle ensembles and non-linear collective effects, and use machine learning (ML) for analysis and to create "virtual twins" of accelerator systems. Here, we will present the IsoDAR experiment in neutrino physics as an example. For it, we have developed a compact and cost-effective cyclotron-based driver to produce very high-intensity beams. The system will be able to deliver cw proton currents of 10 mA on target in the energy regime around 60 MeV. 10 mA is a factor of 10 higher than commercially available machines. This increase in current is possible due to longitudinal-radial coupling through space charge, an effect dubbed "vortex motion". We will discuss the high-fidelity OPAL simulations performed to simulate this effect in the IsoDAR cyclotron and predict beam losses due to halo formation. We will present uncertainty quantification for this design and we will show our study to optimize the IsoDAR injector RFQ using ML.
slides icon Slides TUYE6 [2.414 MB]  
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OPAL for Self-Consistent Start-to-End Simulation of Undulator-Based Facilities  
  • A. Albà, A. Adelmann
    PSI, Villigen PSI, Switzerland
  • A. Fallahi
    ETH Zurich, Photonics Laboratory, Zurich, Switzerland
  The Object Oriented Parallel Accelerator Library (OPAL), a parallel open source tool for charged-particle optics is augmented with a new flavor OPAL-FEL. With OPAL-FEL we solve the electromagnetic potential equations in free-space for radiating particles propagating along an undulator using an FDTD/PIC scheme. We present results of two benchmark [1] studies where OPAL-FEL simulations are compared to experimental results. Both experiments are about electron beamlines where the longitudinal phase space is modulated with a short magnetic wiggler. To our knowledge, this is the only beam dynamics model that allows a start-to-end simulation of FELs, in a fully 3D fashion including radiation.
[1] arXiv:2112.02316 (
slides icon Slides WEXD4 [7.843 MB]  
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Modelling H Injection and Painting in Vertical and Horizontal FFAs Using OPAL  
  • C.T. Rogers
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • A. Adelmann
    PSI, Villigen PSI, Switzerland
  H phase space painting using charge-exchange has been used in synchrotrons to inject and accumulate high intensity bunches of protons, but has never been used in Fixed Field Accelerators (FFAs). In H charge-exchange injection, H ions pass through a thin foil where the electrons are stripped from the ion leaving a proton. In combination with an appropriate dipole, well-separated H ion and proton beams converge at the foil in this non-Liouvillean process. This can be combined with painting of the phase space, where the position of the injected beam is manipulated with respect to the circulating protons in order to inject beams having a specific profile in phase-space. In this paper the simulation of such injection is studied, performed using the latest improvements in the OPAL code. Injection into a small test ring that is under development as part of the ISIS upgrade program is considered.  
slides icon Slides THZD5 [1.093 MB]  
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