Senior HTS Magnet Cryogenics Engineer

About Thea Energy:  

Thea Energy is leveraging recent breakthroughs in stellarator physics and engineering to create a faster and simpler approach to commercializing fusion energy. The company is reinventing the stellarator using computer-controlled arrays of planar coils thereby replacing the intricate, complex modular magnets required in all other stellarator architectures. Thea Energy is on a mission to create a limitless source of zero emission energy for a sustainable future. 

Position Overview: 

We are seeking an experienced Senior HTS Magnet Cryogenics Engineer with at least 8 years of hands-on expertise to lead the thermal and cryogenic design of next-generation High-Temperature Superconducting (HTS) magnet systems and associated test facilities. You will bridge the gap between HTS coil performance, complex cryogenic cooling circuits, and thermal isolation to deliver reliable high-field magnet systems.

• Design, model, and integrate cryogenic cooling systems (conduction-cooled, cryo-fluid loops, or liquid helium/nitrogen systems) for HTS magnet assemblies.
• Perform thermal, fluid, and structural FEA modeling (e.g., ANSYS, COMSOL) to optimize temperature profiles, cooling margins, and quench behavior.
• Select, specify, and procure cryogenic hardware, including cryocoolers, thermal straps, current leads, vacuum vessels, and instrumentation.
• Lead cryogenic testing, commissioning, and validation of HTS magnet prototypes from 20K up to 77K environments.
• Troubleshoot thermal leaks, vacuum degradation, and cryogenic system integration issues during test campaigns.
• Mentor junior engineers and collaborate directly with magnet designers, electrical engineers, and manufacturing teams.

• 8+ years of dedicated professional experience in cryogenic engineering, specifically applied to superconducting magnet systems (HTS preferred; LTS with strong HTS understanding is considered).

• Bachelor’s or master’s degree in mechanical engineering, Aerospace Engineering, Applied Physics, or a related field (Ph.D. preferred).

• Deep expertise in vacuum technology, and low-temperature material properties.
• Proven experience in cooling superconducting magnets – MRI, accelerators or fusion systems
• Proven experience with cryogenic refrigeration systems (Gifford-McMahon, Pulse Tube, or Stirling cryocoolers or large cryoplants).
• Proficiency in thermal simulation software (ANSYS, COMSOL, or Thermal Desktop) and CAD systems (SolidWorks or NX).
• Practical laboratory experience with cryogens (LN_2, LHe), vacuum leak detection, and sensor integration (cernox, thermocouples).

• Comprehensive health benefits (e.g. medical/dental/vision)
• Employee equity stock options
• 20 days PTO

It’s not necessary to meet all of the skillsets outlined above. Please feel free to send us a note and tell us why you would still be a great fit for this role or Thea Energy.  

Diversity and Inclusion:  

Thea Energy is an equal opportunity employer committed to creating a company of diverse backgrounds. By creating a diverse environment, we will bring new ideas and approaches to solving some of the world’s hardest (and most important) problems. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, sexual orientation, gender identity or expression, national origin, family or marital status, age, disability, veteran’s status, or other characteristic protected by applicable laws and regulations.