Physicist/Scientist- X-Ray Source Modeling

Role summary

Own the physics modeling that sets the performance limits of our X-ray sources: electron optics from cathode to target, thermal behavior of components under high electrical power density, and X-ray generation and transport through to the detector. You will be the person the team trusts to say what a design will do before it is built, and to say how confident you are.

Responsibilities

• Simulate electron optics end to end: thermionic emission, space-charge-limited transport, focusing and aberration, deflection, and spot formation in realistic geometry with realistic applied fields.
• Build coupled electrothermal models of beam power deposition on targets, apertures, and grids: conjugate heat transfer, radiative exchange, transient and duty-cycled loading, thermally driven distortion, and the feedback of that distortion onto beam and spot performance.
• Model X-ray generation and transport: bremsstrahlung and characteristic emission yield from transmission and reflection targets, self-absorption in target and substrate, spectral shaping by filtration and windows, downstream optics, and detector response.
• Quantify and communicate uncertainty: convergence and mesh studies, sensitivity to material property data and geometric tolerance, and an explicit statement of what each model can and cannot predict.
• Design the experiments that test the models. Identify which measurable actually discriminates between competing hypotheses, then work with the lab to execute and interpret.
• Translate sensitivity results into design and manufacturing decisions: drawing tolerances, alignment budgets, process windows.
• Script and version simulation workflows so parametric studies are reproducible and re-runnable by someone else.
• Contribute to technical customer engagements
• Mentor junior physicists and engineers in modeling practice, including the habit of validating before believing.

Required

• MS or PhD in physics, applied physics, EE, ME, nuclear engineering, or a related field, plus roughly 5+ years applying simulation to physical hardware.
• Demonstrated ownership of at least two of: charged particle optics, thermal and structural analysis materials under high thermal load, X-ray generation and optics.
• Fluency in finite element methods and their limits, plus working knowledge of at least one other relevant numerical approach: boundary element, particle-in-cell, Monte Carlo radiation transport, or ray tracing.
• Multiphysics tools (COMSOL, Opera, CST, ANSYS, Lorentz, FEniCS, or comparable), driven through their scripting interfaces rather than the GUI alone.
• Python, C, or C++ for pre- and post-processing, data reduction, and optimization loops.
• Version control as a default habit.
• A track record of comparing model to measurement, finding them in disagreement, and diagnosing why.

Preferred

• Monte Carlo radiation transport (Geant4/TOPAS, PENELOPE, EGSnrc) for electron-target interaction, spectrum, and dose.
• X-ray optics simulation (SHADOW/OASYS, XRT, McXtrace, SRW) and dynamical diffraction calculation for crystal optics.
• Cathode and emission physics: dispenser cathodes, LaB₆ or CeB₆, field emission, lifetime and poisoning mechanisms.
• High-vacuum practice: outgassing, thermal management across brazed and welded joints, contact conductance, high-voltage holdoff and breakdown.
• Adjacent-field background: accelerator or beamline physics, electron microscopy, vacuum electronics (TWT, klystron, magnetron), medical or industrial X-ray tubes, e-beam lithography, semiconductor metrology.
• Design of experiments, numerical optimization, surrogate or reduced-order modeling.
• Comfort working from mechanical CAD, including defeaturing and model prep.

Business Expertise

• Has knowledge of best practices and how own area integrates with others

Leadership

• Acts as a resource for colleagues with less experience; may lead small projects with manageable risks and resource requirements

Problem Solving

• Solves complex problems; takes a new perspective on existing solutions; exercises judgment based on the analysis of multiple sources of information

Impact

• Impacts a range of customer, operational, project or service activities within own team and other related teams; works within broad guidelines and policies

Interpersonal Skills

• Explains difficult or sensitive information; works to build consensus

## Qualifications

### Education:

Bachelor's Degree

### Skills

### Certifications:

### Languages:

### Years of Experience:

4 - 7 Years

### Work Experience:

## Additional Information

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### Shift:

10-Day 8-Hr (United States of America)

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### Travel:

Yes, 10% of the Time

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### Relocation Eligible:

Yes

### Referral Payment Plan:

Employee Referral (Standard)

Salary Range:

$120,000.00 - $165,000.00

The salary offered to a selected candidate will be based on multiple factors including location, hire grade, job-related knowledge, skills, experience, and with consideration of internal equity of our current team members. In addition to a comprehensive benefits package, candidates may be eligible for other forms of compensation such as participation in a bonus and a stock award program, as applicable.

For all sales roles, the posted salary range is the Target Total Cash (TTC) range for the role, which is the sum of base salary and target bonus amount at 100% goal achievement.

Applied Materials is an Equal Opportunity Employer committed to diversity in the workplace. All qualified applicants will receive consideration for employment without regard to race, color, national origin, citizenship, ancestry, religion, creed, sex, sexual orientation, gender identity, age, disability, veteran or military status, or any other basis prohibited by law.