Senior​/Principal​/Senior Principal Scientist; Multi-Level

JOB DESCRIPTION

MSTS offers full‑time employees highly competitive salaries and benefits packages including medical, dental, vision; both a pension and a 401(k); paid time off and 96 hours of paid holidays; relocation (if located more than 75 miles from work location); tuition assistance and reimbursement; and more. MSTS is a limited liability company consisting of Honeywell International Inc., Jacobs Engineering Group Inc., and HII Nuclear Inc.

Mission Support and Test Services, LLC (MSTS) manages and operates the Nevada National Security Site (NNSS) for the U.S. National Nuclear Security Administration (NNSA). Our mission is to help ensure the security of the United States and its allies by providing high‑hazard experimentation and incident response capabilities through operations, engineering, education, field, and integration services and by acting as environmental stewards to the Site’s Cold War legacy.

Our vision is to be the user site of choice for large‑scale, high‑hazard, national security experimentation, with premier facilities and capabilities below ground, on the ground, and in the air.

The Enhanced Capabilities for Subcritical Experiments (ECSE) program is seeking outstanding scientists at various career stages (Senior Scientist, Principal Scientist, Senior Principal Scientist) to work with the ESCE team to support installation, commissioning, and technical maturation of the world’s newest and most advanced linear induction accelerator, Scorpius at the Nevada National Security Site (NNSS).

Scientists will contribute to ECSE program advancing high‑current pulsed accelerator, beam transport, and x‑ray source performance. Responsibilities span experimental activities (e.g. diagnostic developments), modeling and simulations, data analysis, and cross‑disciplinary collaboration with pulsed power, target, controls, and operation teams in a high‑consequence DOE environment. Successful candidates will work within a collaboration between the Nevada National Security Site, Los Alamos National Laboratory, Livermore National Laboratory, and Sandia National Laboratory to prepare the accelerator for state‑of‑the‑art experiments and to solve challenging problems that will improve accelerator performance and understanding of the physics behind.

• Devises imaginative, thorough, and practical solutions requiring evaluation of standards and processes. Solutions may be unique.
• Design, execute and analyze accelerator/beam experiments.
• Develop, commission, and operate beam and x‑ray diagnostics.
• Build, validate, and apply physics models and multiphysics simulations; compare to experimental data and iterate designs.
• Apply targeted machine learning to speed up tuning, improve diagnostics insights, and support experiments planning; build data workflows and integrate with controls where appropriate, validate models against measurements.
• Author test plans, procedures, and technical reports; present results to program leadership and external partners.
• Work safety with high voltage, radiation, vacuum/pressure systems; follow Work Planning & Control and configuration management.
• Collaborate across controls (timing/EPICS), solid‑state pulse power, alignments, targets, and operations.

• Lead major ECSE work streams; define technical roadmaps; serve as design and test readiness reviews; mentor team.
• Lead a small machine learning deployment tied to an experiment; establish validation/rollback.
• Maintain a rigorous safety culture; own hazard analysis and control implementation for a campaign; enforce configuration management and readiness checklist.

• Serve as technical lead for major ECSE capability areas; define requirements, interfaces, and acceptance criteria.
• Plan and lead the future multi‑campaign test efforts from IOC to FOC.
• Integrate cross‑discipline work (pulsed power, magnets/alignment, controls/EPICS, target/diagnostics) to achieve replicable beam/x‑ray performance.
• Set minimal standards for machine learning use and oversee one or two high‑value deployments.
• Maintain a rigorous safety culture; author/approve…