Research highlights

PWFA simulation

Scale disparity in simulations of PWFA with a witness beam using linear collider parameters (beams move to the right).(Click for larger image)

Algorithms for Optimizing Particle Accelerator Beam Emittance
Multi-parameter optimization method for minimizing the emittance from laser-plasma accelerators

Optimizing Dipole and Quadrupole Strengths,
Better Accelerators Designed with Numerical Optimizers and Simulations
Multi-parameter design optimization to minimize beta functions in a rapid cycling synchrotron for a potential 2.4 MW beam power upgrade.

Unifying Derivative-Free and ​
Zeroth-Order Optimization Methods​
Survey of derivative-free optimization formulations and algorithms

Mixed-Integer Simulation-Based Optimization
New derivative-free optimization algorithm for simulation-based optimization for unrelaxable integer constraints

Manifold Sampling for Structure-Exploiting Optimization
New manifold sampling algorithm for composite simulation-based optimization; useful for exploiting structure in emittance minimization

Improving performance of sparse direct methods via fill-preserving permutations
Fast implementations of a preprocessing step in sparse matrix factorization to improve dense block structure that will enhance the performance of sparse direct solvers

Evaluation of Sparse Direct and Iterative Finite Difference Field Solvers in the QuickPIC code
Evaluation of sparse direct and iterative solvers in finite difference field solvers in the QuickPIC code

Accelerator Simulations at Scale Using GPUs​
Integrate Kokkos Core data structures and parallelization primitives into Synergia to enable code execution on both traditional CPUs and modern hybrid GPU architectures using the same code base.

Beam Simulation Combined with Lost Particle Tracking
Particles are simulated in an accelerator with Synergia. Lost particles are transported through the surrounding with the MARS energy deposition code. Energy deposited in material surrounding the accelerator is enumerated and available for use in an optimizer loop.

PWFA simulation

The longitudinal phase space in z and pz from a Synergia simulation of multiple bunches slip-stacking in the Recycler.
(Click for larger image)

/uploads/2020/02/FNAL_PIP-II.pptx”>Synergia Simulations of Injecting Painting Support PIP-II​
The PIP-II project will build an 800 MeV superconducting linac to inject into the Booster replacing the current 400 MeV linac. Injecting at higher energies reduces space charge forces allowing the complex to reach 1.2 MW of delivered beam power. To further reduce space charge, the particle distribution is painted in phase space to spread its spatial extent.

QPAD: A novel quasi-static particle-in-cell code based on an azimuthal Fourier decomposition
Development of a novel quasi-static particle-in-cell code based on an azimuthal Fourier decomposition achieving dramatic speedup over current fully explicit and quasi-static 3D codes.

Generating high quality ultra-brightness electron beams using downramps and evolving drivers