Engineering Physics Intern - Ion Beams

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Marathon Fusion

11-50 employeesSan Francisco, CaliforniaRenewable Energy Equipment Manufacturing
Actively hiringPaidSpring 2027Renewable Energy Equipment Manufacturing
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About the role#

You will join our R&D engineering team to work on ion-beam development for neutron production and radioisotope transmutation. We are currently scaling neutron gun prototypes into a high-flux reactor and will be upgrading our beam design and capabilities. This position is for the Spring 2027 term.

What you'll do#

  • Assist with the development and implementation of a high-power ion beam.
  • Design components and assemblies for high-voltage operation while mitigating vacuum breakdown and improving beam optics.
  • Integrate fabricated and acquired components.
  • Build and modify high-power electrical systems, including corona rings, diagnostic systems, controls hardware, and control system software.

What you'll need#

  • Current enrollment in mechanical engineering, electrical engineering, physics, engineering physics, or a related technical field.
  • Proficiency with 3D CAD software.
  • Meaningful applied experience in fabrication, test engineering, or vacuum systems operation.
  • Exceptional work ethic, eagerness to learn, and the ability to work autonomously.
  • Proficiency with basic machine shop fabrication, such as using a lathe and mill.
  • Experience with high-voltage electrical systems, high-vacuum systems, and small-scale experiment development.
  • Proficiency with basic electrostatic modeling.
  • Ability to think holistically, diagnose issues independently, and collaborate cross-functionally.
  • Experimental mindset with the ability to form and test hypotheses.
  • Familiarity with plasma physics, high-power battery systems, or fabrication for scientific applications is helpful.

Location & details#

  • Location: San Francisco, California.
  • Term: Spring 2027.
  • Work Modality: On-site.
  • Employment: Full-time.
  • Compensation: $27.88 to $40.87 per hour, plus a $1,500 relocation bonus.

About Marathon Fusion

Marathon Fusion develops fuel processing technology for fusion power plants. The company focuses on the practicality and adoption of fusion energy. It operates within the renewable energy equipment manufacturing sector. Based in San Francisco, California, the organization employs between 11 and 50 people.

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