Research Scientist - Advanced Projects

Job Type: Full-Time

The Princeton Plasma Physics Laboratory (PPPL) seeks a Staff Research Scientist to lead the commissioning, integration, and scientific exploitation of a femtosecond two-photon absorption laser-induced fluorescence (fs-TALIF) neutral‑density diagnostic and the real‑time edge Thomson scattering system on the WEST tokamak (CEA Cadarache, France). The successful candidate will deliver real‑time, spatially resolved measurements of edge neutral (deuterium) profiles co‑located with WEST's high‑resolution Thomson scattering system, and will use these data to develop a quantitative understanding of WEST edge and pedestal dynamics in an ITER‑relevant, full‑tungsten environment.

This is a unique opportunity to build a first‑of‑a‑kind diagnostic capability and contribute directly to the U.S. and international fusion power‑exhaust mission. The position is based at PPPL (Princeton, NJ) and will require several international trips of 2 to 4 weeks per year to WEST.

• Diagnostic design, integration, and commissioning. Design, bench‑test, and deploy the fs‑TALIF system on WEST, including the coaxial beam transport that overlaps the Thomson scattering laser, the opto‑mechanical and vacuum‑window interfaces, UV beam delivery (205 nm), and collection optics; verify beam pointing, pulse duration, and spot size against WEST constraints. (30%)
• Real‑time integration and calibration. Synchronize fs‑TALIF with the WEST central timing system and the high‑resolution Thomson scattering diagnostic, integrate data acquisition with the WEST database, and establish absolute neutral‑density calibration using a krypton reference cell to enable real‑time edge measurements at up to 1 kHz. (20%)
• Edge‑profile studies and physics analysis. Lead measurement campaigns acquiring simultaneous, co‑located n_D, n_e, and T_e profiles across L‑mode, H‑mode, and gas‑puff scenarios, impurity dropper, and multiple plasma configurations; analyze WEST edge dynamics, including neutral penetration, the local ionization source, edge parameters, and divertor neutral behavior. (25%)
• Model validation and scientific output. Support the model validation using the measured neutral distributions against DEGAS 2 predictions, deliver datasets to the modeling team, and disseminate results through peer‑reviewed publications and conference presentations. (15%)
• Collaboration and project coordination. Coordinate with PPPL, CEA/WEST, and Texas A&M collaborators; mentor students and postdoctoral researchers; and contribute to project reporting and DOE data‑management compliance. (10%)

• Ph.D. in plasma physics, applied physics, optical science/engineering, or a closely related field, plus a minimum of 2 years of relevant postdoctoral or research experience.
• Demonstrated experience with laser‑based plasma diagnostics (e.g., LIF/TALIF, Thomson scattering, or comparable laser spectroscopy) is required, along with hands‑on experience deploying diagnostics on a tokamak or other magnetic‑confinement or laboratory plasma device.
• Expertise in laser diagnostics and optical design. Background in Thomson scattering including real time integration in magnetically confined devices.
• Proficiency in scientific programming and data analysis (e.g., Python, MATLAB, or IDL) and real‑time data acquisition.
• Ability to design, align, and operate complex opto‑mechanical systems in a fusion environment, to integrate diagnostics with machine timing and database systems, and to work effectively within an international, multi‑institutional collaboration.
• Excellent written and verbal communication skills, and a record of peer‑reviewed publication.
• Willingness and ability to travel internationally and work on‑site at WEST (CEA Cadarache, France) for extended periods.

• None required er safety certification and radiation‑worker and site‑specific safety training are required and will be provided as a condition of working on‑site at PPPL and WEST (CEA Cadarache, France).

• Ability to work in and around experimental laser and experimental facilities, including periods of standing, bending, and working in…