13 Aug 2026
Job Information
- Organisation/Company: RIKEN
- Department: Administrative Support Office
- Research Field:
- Geosciences
- Astronomy
- Physics
- Chemistry
- Mathematics
- Technology
- Engineering
- Researcher Profile: Recognised Researcher (R2)
- Application Deadline: 30 Oct 2026 - 23:59 (UTC)
- Country: Japan
- Type of Contract: Permanent
- Job Status: Not Applicable
- Hours Per Week: See description
- Is the job funded through the EU Research Framework Programme? Not funded by a EU programme
Offer Description
Background of the recruitment and description of the project
As the driving force of the RIKEN RI Beam Factory (RIBF) — the world's most advanced heavy-ion accelerator facility — the Accelerator Group is dedicated to the technical development, operation, and maintenance required to provide a diverse range of high-intensity heavy-ion beams with long-term stability.
The Next-Generation Heavy-Ion Accelerator System Development Team is advancing the RIBF Upgrade Program to further increase beam intensity at the RI Beam Factory (RIBF), focusing on the development of the Charge Stripper Ring (CSR). The CSR is a unique accelerator in which an ion beam circulates in the ring while repeatedly undergoing charge exchange until the desired charge state is reached. Our work covers the simultaneous and stable circulation of multi-charge-state beams, gas charge-exchange schemes, and beam control techniques that exploit charge exchange. We also explore a future extension of the CSR concept toward a heavy-ion internal-target ring, referred to as “Chreostron.”
Keywords
high-intensity heavy-ion beam,charge stripper ring,multiple-charge-state beam,gasstripper,beam cooling,accelerator,cyclotron,linear accelerator,heavy ion,beam,electroniccircuit,electrical system,instrumentation,superconductivity,electromagnet,liquid helium,radio frequency,microwave,accelerating cavity,nuclear physics,high-energy physics,electromagnetic field analysis,charged particle,particle simulation,atomic physics,nuclear engineering,ion source,plasmaphysics,experimental physics,electromagnetism
For more information, please visit our webpage: https://www.nishina.riken.jp/labo/accel_e.html
Details of the business
RIKEN is Japan's largest and most comprehensive research organization for basic and applied science.
Work content and job description
Department: Next-Generation Heavy-Ion Accelerator Systems Development Team
Team Leader: Hiroshi Imao
The successful candidate will be engaged in a technical development research project for the development and construction of the CSR (Charge Stripper Ring) planned at the RIKEN RI Beam Factory (RIBF), with a view toward its future operation and further upgrading. The CSR is a unique complex accelerator system designed to increase beam intensity by circulating heavy-ion beams in multiple charge states simultaneously in the ring and repeatedly using an internal charge stripper. The main duties will involve part of the device development related to the design and construction of the CSR, mainly in one of the following areas: the charge stripper system, electromagnet systems, vacuum systems, or beam diagnostic systems. After completion of the system, the successful candidate will also undertake research and development to ensure stable operation and improve performance, as well as maintenance of the equipment. These activities will include the application of artificial intelligence and data-science methods to CSR beam tuning and operational optimization.
The job description may be changed during the contract period or upon contract renewal to the extent described above.
Assigned department
Existing departments
Work location
Address: 351-0198 Saitama, 2-1 Hirosawa, Wako, RIKEN Wako Campus
RIKEN may order the employee to change work locations, if necessary.
Number of hired
Number of hired: 1 person(s)
Number of hired description: Postdoctoral Researcher or Research & Development Scientist, one position
Postdoctoral Researcher: In principle, Postdoctoral Researcher is defined as those who obtained a doctoral degree no more than 5 years ago. Receive training and guidance from senior staff; conduct research projects and other activities for Programs or equivalent.
Research & Development Scientist: Research & Development Scientist must have over 5 years of research or practical experience. Conduct technical development research projects and other activities.
The applicant will be assigned to an appropriate position based on his/her ability, aptitude, etc.
Job content supplemental explanation: Start of Employment: April 1, 2027 (Negotiable)
Requirements
Additional Information
Benefits
Compensation
Annual salary: 4 million yen
Wages description: Salary will be an annual salary based on experience, ability, and performance, and will consist of a base salary and a variable salary. The variable salary will be determined each fiscal year based on experience, ability, and performance.
Discretionary work, commuting and housing allowances will be provided. Social insurance will be applied.
The approximate amount of salary at the time of employment:
Postdoctoral Researcher: The total amount of monthly discretionary work allowance and monthly salary at the time of hiring will be 382,610 JPY or more.
Research & Development Scientist: The total amount of monthly discretionary work allowance and monthly salary at the time of hiring will be 448,990 JPY or more.
Working hours: 09:00-17:20
Break time: 12:00-12:50
Holidays: Days off include public holidays, New Year's holidays (Dec. 29 - Jan 3), and RIKEN Foundation Day.
Paid leave includes annual paid leave (up to 20 days depending on the month of employment), special paid leave (caring for a sick child, family nursing care, etc.), and work life balance holidays (up to 7 days depending on the month of employment).
Overtime and other explanations: This position falls under the specialized duties discretionary work system; one working day will be calculated as 7 hours and 30 minutes.
Employment type: Contract employee
Employment type description: Postdoctoral Researcher or Research & Development Scientist
Contract period: Nontenured
Contract period description:
- A one-year fixed-term employment contract, renewable based on evaluation, up to 5 years for Postdoctoral Researcher or up to 7 years for Research & Development Scientist from initial date of hire.
- RIKEN may adjust the above maximum period of renewability based on a) the employee's abilities, work load at the time of contract completion, performance and work attitude and b) the continuation of the employee's center, laboratory or project and RIKEN's management situation and budget at the time. In principle, employment contracts will not be renewed for individuals older than 70 years old.
- There will be an interim review around the 3rd year (Postdoctoral Researcher), 5th year (Research & Development Scientist).
Probationary period: Probationary period present
Probationary period description: In principle, the first two months of employment are considered a trial period.
There is no change of working conditions.
Various systems
Pay increase system: Salary will be an annual salary based on experience, ability, and performance, and will consist of a base salary and a variable salary. The variable salary will be determined each fiscal year based on experience, ability, and performance.
Transportation expenses: available
Others: Mandatory membership in the RIKEN Mutual Benefit Society (RIKEN Kyosaikai). There are also additional leave systems such as maternity leave, childcare leave, and family nursing care leave.
Insurance
Employees' Health Insurance: available
Employees' Pension Insurance: available
Worker's accident insurance: available
Employment insurance: available
Others: available
Measures for preventing passive smoking at the workplace
Smoking is entirely prohibited on site.
Supplementary explanation of compensation
RIKEN has a telecommuting system, but this position requires attendance at the work location. Therefore, the telecommuting system is not available for this position, in principle.
Eligible to apply for the MEXT Grants-in-Aid for Scientific Research (Kakenhi).
RIKEN is actively undertaking initiatives to promote gender equality and diversity, and moving forward with the establishment of a diverse and vibrant research environment. If multiple candidates are found to have the same aptitude following a fair assessment, active efforts will be made to recruit female candidates.
The Wako Campus has an on-site daycare, RIKEN Kids Wako. For details, please send an email to kids@riken.jp.
Additional comments
Handling Personal Data: Submitted documents are strictly protected under the RIKEN Privacy Policy and will be used only for the purpose of applicant screening at RIKEN. Personal information will not be disclosed, transferred or loaned to a third party under any circumstances without just cause.
Work Location(s)
Number of offers available: 1
Company/Institute: RIKEN
Country: Japan
City: Saitama
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