Thea Energy

Develops fusion power via planar-coil stellarators

Senior HTS Magnet Cryogenics Engineer

Thermal & Fluids EngineeringConfirmed live in the last 24 hours

Full-timeKearny, NJ, USAIn-person

About the Job

Requirements

At least 8 years of dedicated professional experience in cryogenic engineering applied to superconducting magnet systems; high-temperature superconducting experience is preferred, while low-temperature superconducting experience with strong high-temperature superconducting understanding is acceptable.
A bachelor's or master's degree in Mechanical Engineering, Aerospace Engineering, Applied Physics, or a related field.
Deep expertise in vacuum technology and low-temperature material properties.
Proven experience cooling superconducting magnets for MRI, accelerator, or fusion systems.
Proven experience with cryogenic refrigeration systems, including Gifford-McMahon, pulse-tube, or Stirling cryocoolers, or large cryoplants.
Proficiency with thermal simulation software such as ANSYS, COMSOL, or Thermal Desktop and CAD systems such as SolidWorks or NX.
Practical laboratory experience with cryogens including liquid nitrogen and liquid helium, vacuum leak detection, and sensor integration using Cernox sensors and thermocouples.

Responsibilities

Design, model, and integrate cryogenic cooling systems, including conduction-cooled systems, cryo-fluid loops, and liquid helium or liquid nitrogen systems, for high-temperature superconducting magnet assemblies.
Perform thermal, fluid, and structural finite element analysis modeling using tools such as ANSYS and 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 high-temperature superconducting magnet prototypes in 20 K to 77 K environments.
Troubleshoot thermal leaks, vacuum degradation, and cryogenic system integration issues during test campaigns.
Mentor junior engineers and collaborate with magnet designers, electrical engineers, and manufacturing teams.

Desired Qualifications

Experience with high-temperature superconducting tape technologies, including second-generation rare-earth barium copper oxide, and quench-protection thermal modeling.
Hands-on design of high-current thermal leads, including binary or high-temperature superconducting lead assemblies.
Background building cryogenic test facilities for fusion energy, MRI/NMR systems, high-energy physics, or aerospace high-temperature superconducting applications.
Ph.D. degree.

Salary Range: 140000 to 180000 (Currency: USD) (Pay period: per-year-salary)

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.

Key Responsibilities:

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.

Required Qualifications:

Experience:

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

Education:

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

Technical Skills:

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).

#LI-RD1

Preferred Qualifications:

Experience with HTS tape technologies (2G REBCO) and quench protection thermal modeling.

Hands-on design of high-current thermal leads (binary or HTS lead assemblies).

Background in building cryogenic test facilities for fusion energy, MRI/NMR systems, high-energy physics, or aerospace HTS applications.

Company Benefits:

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.

About the Company

Thea Energy

Develops fusion power via planar-coil stellarators

Thea Energy develops fusion-based power technology to provide scalable, zero-emission baseload electricity for utilities and heavy industry. Its approach uses a reimagined stellarator with flat, planar superconducting coils controlled by software-defined systems, replacing the traditional complex magnet geometry to lower costs and improve serviceability. Its Eos neutron-source device and Helios commercial power plant concept illustrate a pipeline from research to grid-ready power, backed by DOE milestones and public-private partnerships. The company aims to commercialize fusion as a dependable grid-level energy source and win long-term offtake agreements with utilities and large customers.

Company size: 51-200
Company stage: Grant
Total funding: $145.8M
Headquarters: Princeton, NJ
Founded: 2022

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