PH - Test & Commissioning Engineer_Junior level

Mission

You will take technical ownership of our high-power gyrotron systems throughout the entire acceptance process — from factory testing at our Adogawa facility (Shiga prefecture), through installation and com# Missioning at customer sites, to final handover for operational use.

This role is about more than testing equipment. You will be responsible for ensuring that our systems perform as designed and for seeing them through to successful operation at the customer site. As the final technical checkpoint before delivery, you will play a critical role in ensuring the performance, reliability, and quality of everything we deliver.

Our # Mission is to make fusion energy a practical and sustainable energy source. Achieving this requires not only cutting-edge technology, but also the expertise to ensure that it performs reliably in the real world.

We are looking for someone who wants to take ownership of that final, critical stage — helping bring our technology from development into operation and contributing directly to the commercialization of fusion energy.

Key Responsibilities

• Develop test plans and procedures for gyrotron systems, including the design of test fixtures and instrumentation.
• Perform millimeter-wave measurements, including output power, frequency, mode patterns, reflected power, and arc detection, and analyze the resulting data.
• Conduct conditioning operations across the full system, including high-voltage, vacuum, and cooling subsystems, and optimize voltage ramp-up sequences.
• Serve as the responsible on-site engineer for Factory Acceptance Testing (FAT) in Japan, as well as Site Acceptance Testing (SAT) and com# Missioning at overseas customer sites.
• Plan the start-up and safety design of new test facilities, including irradiation test ranges, beam dumps, shielding, and interlock systems.
• Compile and analyze test data, prepare technical reports, and feed findings and lessons learned back into the engineering and design teams.

*Given the broad scope of this role, your specific responsibilities will be determined based on your experience, expertise, and areas of strength.

What makes this role unique

• Global Impact: Take part in the on-site com# Missioning of high-power gyrotron systems for some of the world’s leading fusion projects, and see the technology you work on come to life in the field.
• Rare Expertise: Develop highly specialized expertise in testing and com# Missioning high-power gyrotron systems — a field with very few experienced engineers in Japan.
• Mission: Contribute directly to the commercialization of fusion energy by taking ownership of the final stage of delivery, ensuring that our systems meet the required performance and quality standards before entering operation.

Additional Information for Applicants

To allow sufficient time for reassessment, we ask candidates not to reapply for the same position within six months of their previous application.

・Testing and commissioning of industrial equipment, electrical systems, or research facilities
・ Project engineering for large-scale equipment, from test planning through commissioning and handover
・Design and development of measurement systems, including data acquisition and analysis
・Electrical measurement or the operation and handling of high-voltage equipment
・Preparation of test procedures, test documentation, and technical reports
・Willingness and ability to travel domestically and internationally, including several overseas trips per year for commissioning activities
・Intermediate English proficiency, with the ability to read and write technical documentation and participate in technical discussions and meetings in English

・Japanese language proficiency at JLPT N3 level or above

Experience or knowledge in any of the following areas is highly desirable:

・Millimeter-wave or microwave measurement experience (power measurement, mode patterns, network analyzers, etc.)
・Experience with conditioning operation of high-voltage or vacuum equipment
・Knowledge of design of experiments (DoE) and statistical data analysis
・Practical experience with Japan's Radio Act (experimental station licensing), RF exposureprotection guidelines, or the Technical Standards for Electrical Installations
・Knowledge of interlock and safety design (IEC 61508 or similar)
・Experience with thermal imaging or infrared thermography
・Certifications such as Chief Electrical Engineer (Denki Shunin Gijutsusha) or Radiation Protection Supervisor

・Someone who resonates with our Vision, Mission, and Values and demonstrates them in their day-to-day work
・Strong analytical and problem-solving skills, combined with effective communication and a collaborative mindset
・A genuine curiosity for understanding what is happening on the ground — using measurement and observation to identify and investigate root causes
・A strong commitment to safety, with the ability to develop clear, practical, and reliable procedures