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High Performance Computing for Particle Methods - R&D Associate

Date: Sep 15, 2022

Location: Oak Ridge, TN, US, 37830

Company: Oak Ridge National Laboratory

Requisition Id 9054 

The Neutrino Research Group in the Fundamental Nuclear and Particle Physics Section within the Oak Ridge National Laboratory (ORNL) Physics Division seeks applicants for an R&D Associate staff position. The group is looking for someone passionate about advancing the state-of-the-art methods for a variety of physics and engineering applications, in particular transport methods and coupled physics simulations. These methods will be implemented using modern code development tools and practices to be scalable to the world’s largest supercomputers, including advanced heterogeneous architectures. We are looking for developers with experience in high-energy and nuclear physics experiments to help develop and integrate the new Monte Carlo detector simulation code, Celeritas, into HEP and NP frameworks that are used at the Large Hadron Collider (LHC) at CERN and other HEP experimental facilities such as the neutrino program at Fermilab and the Sanford Underground Reseach Facility.


Job Duties and Responsibilities:

  • Performing individual and collaborative R&D for complex problems and communicating the technical aspects of the work performed through publications and presentations.
  • Effectively interacting with technical peers, program managers, and sponsors, both domestically and internationally, to meet the requirements of projects within scope, schedule, and budget.
  • Leading elements of research projects with some latitude to define objectives and approaches to ensure technical and programmatic success.
  • Effectively interacting both domestically and internationally with technical peers, program managers, and sponsors to meet the requirements of projects within scope, schedule, and budget and advance the use of the leadership computing facilities for HEP in particular the CERN research program.


As a computational physicist your duties may include:

  • The development, implementation, and optimization of methods and algorithms for radiation transport and coupled multi-physics applications on leadership-class computer hardware including GPUs and accelerators.
  • The development of user features, verification, and validation of production-quality HEP and nuclear software for detector simulation, neutronics, multiphysics, and radiation shielding applications for global distribution.
  • The development, numerical analysis, and verification of new computational methods for complex problems in HEP and nuclear technology applications.
  • Coordination with leadership computing facilities, including the Oak Ridge Leadership Computing Facility (OLCF), to manage allocations, job queues, and application deployment.


Basic Qualifications

  • A PhD in physics, nuclear engineering, computer science, or related discipline
  • Demonstrated programming experience in modern C/C++ (>= C++-11)
  • Experience using or developing detector simulation frameworks, such as those based on Geant4 that are applied towards detector simulation in LHC experiments, e.g., CMS, ATLAS, ALICE, or others


Preferred Qualifications:

  • Knowledge of computational physics R&D as demonstrated through research and associated publications
  • A background in computational particle transport methods and/or physics, particularly Monte Carlo methods for particles defined by the Standard Model (SM)
  • Broad experience with advanced programming models including MPI and OpenMP
  • GPU-based programming models including CUDA/HIP, SYCL, OpenMP, or equivalent
  • Familiar with software tools expected to be heavily used in this position, which include Python, Git, parallel Linux/POSIX computing platforms, parallel job queuing systems, and parallel visualization software (Paraview, VisIt)
  • Experience using profiling and debugging software in large-scale parallel computing environments.
  • Excellent communication skills, including verbal, presentation, and writing skills, are required to enable effective interaction with technical peers and program managers.


This position will remain open for a minimum of 5 days after which it will close when a qualified candidate is identified and/or hired.

We accept Word (.doc, .docx), Adobe (unsecured .pdf), Rich Text Format (.rtf), and HTML (.htm, .html) up to 5MB in size. Resumes from third party vendors will not be accepted; these resumes will be deleted and the candidates submitted will not be considered for employment.

If you have trouble applying for a position, please email

ORNL is an equal opportunity employer. All qualified applicants, including individuals with disabilities and protected veterans, are encouraged to apply.  UT-Battelle is an E-Verify employer.

Nearest Major Market: Knoxville