Cryophysicist

Xcimer Energy; Denver (CO); On-site; USD 140,000 - 165,000; Full time

Benefits offered by this job

Medical coverage

Dental coverage

Vision coverage

401(k) with match

Equity

Paid time off

13 holidays and company shutdown

Job summary

Xcimer Energy is seeking a Cryophysicist in Denver, CO to lead experimental and theoretical work on ultra-low temperature systems for inertial fusion energy fueling. You will design, test, and optimize cryogenic processes while collaborating with national labs and universities to advance system design.

The role emphasizes hands-on lab work, modeling, and rapid prototyping within an agile team focused on delivering next-gen fusion technologies.

Qualifications

• Master’s degree plus 3 years experience or PhD in a related field.
• Experience in cryophysics, thermodynamics or superconducting magnetics.
• Strong background in ultra-low temperature engineering and design.
• Experience with lab environments and cryogenic installations.
• Excellent verbal and written communication; U.S. citizen or eligible to work in the U.S.

Responsibilities

• Design, build, and optimize experiments for target filling and related Cryo systems.
• Model and simulate thermal transport, fluid flow, and material interactions.
• Collaborate with national labs and universities to drive objectives and transfer knowledge.
• Contribute to agile, rapid prototyping and build-test-fail-repeat workflows.

Skills

Cryophysics

Thermal transport

Python

COMSOL Multiphysics

Ultra-low temperature

Lab mentorship

Education

Master’s + 3 years or PhD in related field

Tools

PyVISA

SCPI

Job description

Cryophysicist

CryophysicistDenver, COScience – Target Design /Full-Time /On-site Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. Join us in powering a better world with inertial fusion! This is a full-time, onsite role based at our headquarters in Denver, CO. We are welcoming applicants for a Cryophysicist position on Xcimer’s Fill and Injection Station Team. The successful candidate will join a growing group of engineers and scientists aimed at developing the processes and technologies to build a first of its kind Inertial Fusion Energy fueling station for Xcimer’s fusion reactor plant. In this role, you will lead the experimental and theoretical design, characterization, and optimization of physical systems operating at ultra-low temperatures. You will manage relations and work closely with collaborators from national labs and universities to drive research objectives that will critically impact future system design and architecture. This is an entry- to mid-level role focused on experimental and theoretical R&D.

Responsibilities

Experimental Research

• Design, build, and iterate on experiments aimed at advancing target filling processes and technologies.
• Evaluate, analyze, and improve system designs aimed at streamlining rapid target throughput.
• Own the documentation and management of internal test stands and their experiments.
• Partner with a varied team of scientists, engineers, and designers to translate experience into realizable products.

Modeling and Simulation

• Advance the team’s predictive capabilities utilizing COMSOL Multiphysics to model physical systems.
• Leverage Python to develop in-house simulations for thermal transport, fluid flow, and materials interactions.
• Provide insight into results from collaborators and internal experiments using analysis and modeling methods.
• Own documentation and artifacts for developed models and simulations.

Work Share Rotation

• Split your time between the Xcimer Fill and Injection Station team and our external collaborators.
• Serve as the primary contact for the knowledge transfer between our collaborators and Xcimer.
• Balance the role of being both mentor and mentee to both teams.

Research and Development

• Provide fresh perspectives on challenging engineering problems concerning high pressure, high vacuum, and cryogenic environments.
• Own research tasks which will help push the team’s understanding of system capabilities and risks.
• Integrate into an agile team focused on advancing technologies through rapid prototyping and reliance on the build-test-fail-repeat methodology.

Qualification

• Education: Master’s + 3 years experience or PhD in applied physics, engineering physics, mechanical engineering, aerospace engineering, vacuum engineering, or related field
• Experience: 0 - 3+ years of experience in the fields of cryophysicist, thermodynamics, superconducting magnetics, or similar background
• Expertise in ultra low temperature engineering and design with a focus on thermal transport, mechanical compatibility, or liquefaction
• Demonstrated experience on system design and integration teams.
• Demonstrated experience working in laboratory environments and hands-on experience with ultra-low temperature installations.
• Demonstrated experience building thermal, fluid flow, and materials models.
• Experience with both wet and dry cryogenic systems.
• Experience collaborating with a multidisciplinary team of engineers, scientists, and non-domain experts supporting system design.
• Highly self-motivated, with the ability to work independently without guidance.
• Advanced verbal and written communications skills.
• Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the E.S. as a refugee or granted asylum.
• Desired Familiarity with instrumentation controls and scripts, specifically PyVISA and SCPI commands.
• Desired Familiarity with project life-cycle management and the AGILE structure.
• Desired Cryogenics handling safety training.
• Desired Experience with vendor interactions and supply management.
• Desired Experience working in a start-up or quick paced environment.
• Desired Background supporting team expansion and providing mentoring to junior contributors.
• Desired Experience working on R&D teams or developing low TRL products.

Salary

$140,000 - $165,000 a yearCandidates may be considered for other positions at Xcimer Energy, and our actual base salary will be determined on an individual basis and may vary based on job-related knowledge and skills, education, and experience. The range is published in accordance with Colorado Equal Pay for Equal Work Act and California Equal Pay Act.

Equal Employment Opportunity

Equal Employment Opportunity Xcimer Energy is proud to be an Equal Opportunity/Affirmative Action Employer and is committed to attracting, retaining, and developing a highly qualified, diverse, and dedicated work force. Xcimer Energy hires and promotes people on the basis of their qualifications, performance, and abilities. We support the establishment and maintenance of a workplace that fosters trust, equality, and teamwork, in which all employees recognize and appreciate the diversity of individual team members. We provide all qualified applicants for employment and employees with equal opportunities for hire, promotion, and other terms and conditions of employment, regardless of their race, color, religion, gender, sexual orientation, gender identity, national origin/ethnicity, age, physical or mental disability, genetic factors, military/veteran status, or any other status or characteristic protected by federal, state, and/or local law. Xcimer Energy will consider for employment qualified applicants with criminal histories in a manner consistent with applicable federal, state, and local laws. For more information on “EEO Is the Law,” please see here and here.

Benefits

• Xcimer offers a comprehensive benefits package designed to support employee health, well-being, and long-term success.
• Benefits include medical, dental, and vision coverage; basic and supplemental life insurance; short- and long-term disability; paid parental leave for employees at the time of birth or adoption; and a 401(k) with a company match of up to 6%.
• Eligible employees also receive equity, allowing them to share in the company’s long-term success.
• Xcimer operates under a flexible Paid Time Off (ATO) approach.
• Rather than a fixed number of vacation days, employees are trusted to take the time they need to rest and recharge while meeting the expectations of their role and team.
• In addition, employees receive paid sick time, 13 company-paid holidays, and an annual paid company shutdown.
• Benefits are available to regular employees, including part-time and fixed-term roles, as well as interns, with eligibility varying by benefit.
• We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans.
• If you would like more information about how your data is processed, please contact us.