David Bruhwiler Email & Phone Number

Boulder, Co, Us

Boulder, Colorado, Us

In addition to our R&D for the U.S. Department of Energy and the U.S. Air Force, RadiaSoft is actively supporting the particle accelerator industry, assisting commercial customers with medical accelerator design, isotope production, food irradiation, and compact sources of X-rays and gamma-rays. We regularly contract with research laboratories and universities, assisting with induction linear accelerators, X-ray beamlines, synchrotron light sources, free-electron lasers, vacuum chamber design, neutron beamlines, control systems, radiation shielding design, 3D visualization, and GUI development.In 2015, RadiaSoft developed the cloud computing framework Sirepo, which we have deployed continuously as a community gateway. Sirepo supports 6 particle accelerator design apps, 2 for synchrotron radiation and X-ray optics, 1 for magnet design, 1 for free electron lasers, 1 for simulation of vacuum nanoelectronic devices, and 2 for plasma dynamics. An integrated JupyterLab server is also included, as well as apps for machine-learning-based data analysis and particle accelerator controls modeling. Sirepo is integral to the curriculum of the US Particle Accelerator School.

Boulder, Colorado, Us

RadiaSoft develops open source software for computer-aided engineering. Our public CAE gateway Sirepo.com is also instantiated privately for enterprise customers. Our scientists, engineers, software developers and machine learning experts consult with customers in all of the technical domains covered by our CAE products, with an emphasis on machine learning for technical problems in medicine and science, and the development of browser-based GUIs for legacy codes. We also conduct R&D and design systems relevant to: particle accelerator technology, control system algorithms with online models, x-ray beamlines, thermionic converters, magnets, and plasma magnetohydrodynamics.

Santa Monica, Ca, Us

Developing graphical interfaces to a variety of simulation tools for laser and x-ray radiation and for charged particle acceleration to enable new science that requires complex workflows. Modeling advanced concepts for table top production of high-energy, ultra-short electron and radiation pulses.

Boulder, Colorado, Us

Ultra-high gradient table-top acceleration of electrons to GeV scale energies will enable a new era of ultra-fast science, with synchronized femtosecond-scale pulses of electrons, IR laser pulses and x-rays. Modeling meter-scale dielectric and plasma-based structures for such applications requires high-performance computing to achieve sufficient fidelity.

NormForge develops enterprise quality, open source collaborative groupware -- high-performance scalable SaaS for technical standards development, and scientific collaboration.

Boulder, Colorado, Us

• Group leader, managing and mentoring 8 to 10 technical staff, including PhD physicists and mathematicians, as well as software developers.• Awarded and successfully managed multiple SBIR Phase I and Phase II awards from the DOE Office of Science and the Air Force Office of Scientific Research (AFOSR).• Development & use of parallel VORPAL framework to simulate laser-plasma accelerators, leading to co-authorship of article in the 2004 ‘Dream Beam’ issue of Nature.• Lead the adoption, development, implementation and/or use of multiple algorithms for first-principles simulation of electron cooling physics, including: a) 4th-order variable-time-step Hermite, b) semi-analytic binary Coulomb collisions, c) electrostatic delta-f PIC.• Use of VORPAL for electron cooling microphysics simulations lead to two discoveries: explanation of differences in Derbenev vs. Parkhomchuk formulae for magnetized friction; and demonstration of the logarithmic decrease in unmagnetized dynamical friction due to presence of an undulator magnet.• Use of OOPIC Pro to develop the concept of a self-ionizing plasma wakefield accelerator (PWFA), with strongly positive impact on experiments at SLAC.

Boulder, Colorado, Us

• Awarded and successfully managed SBIR Phase I and Phase II awards from the DOE Office of Science and the Air Force Office of Scientific Research (AFOSR).• Member of the OOPIC Pro development team; helped port parallel C++ application from Unix to Microsoft Windows, including the graphical user interface & algorithms for field-induced tunneling ionization of monatomic gasses by intense laser pulses.• Member of the MAPA development team; helped create object oriented design, develop new algorithms, and implement this C++ particle accelerator modeling application.• Member of the OptSolve++ development team; helped create object oriented design, develop new algorithms, and implement this C++ nonlinear optimization library.

Falls Church, Va, Us

• Developed a 1D free-electron laser (FEL) simulation code and used it to successfully model a compact infra-red FEL (CIRFEL, installed and operated at Princeton University).• Developed new analytical model of beam halo development in high-intensity linacs. • Designed photocathode electron guns & beamlines for high charge sub-picosecond pulses; member of design team for the Laser Electron Accelerator Facility (LEAF) at the BNL Chemistry Department: https://www.bnl.gov/chemistry/EPIP/instrumentation.php

Us

• Designed magnetic optics configurations for detailed manipulation of the spatial distribution function of high-current proton and deuterium beams. • Conducted end-to-end simulations of high-current D+ volume source, two-solenoid low-energy beam transport (LEBT) line and radio-frequency quadrupole (RFQ).• Co-developed innovative TOPKARK code for simulation of electron and ion beam lines, including nonlinear self-fields, nonlinear magnetic elements and realistic accelerating fields.

Boulder, Colorado, Us

• Simulated test-particle acceleration in solar coronal flares, numerically verifying analytic predictions of the accelerated energy spectrum. • Co-developed analysis showing the partially stabilizing effect of tied magnetic field lines on the convective instability in a magnetized plasma.

Boulder, Colorado, Us

• Derived a new diffusion coefficient for trajectories in a slowly-driven deterministic Hamiltonian system; nonlinearity plus phase mixing leads to stochastic dynamics.• Co-developed new analytical methods for treatment of arbitrarily-large electric field amplitudes, given field parameters that vary slowly in space or time. Showed relevance to the injection of ion beams into an RFQ and the dynamics of electrons in an FEL.

Phd, Astrophysical, Planetary & Atmospheric Sciences

Bs, Physics And Astronomy