Are you our new colleague?
Are you an experimental physicist with a proven track record in the development and characterization of superconducting devices, including expertise in low-temperature photon detectors? Do you have hands-on experience with cutting-edge ultra-cryogenic facilities?
SRON develops ultra-cryogenic instruments where the sky is no limit.
You and SRON Netherlands Institute for Space Research
You have the chance to be part of a team of instrument scientists, engineers and astronomers with a prominent track record in the development of X-ray detector technology and space instruments.
SRON, as one of the leading institutes in the field, has contributed to the X-ray instruments for ESA (XMM-Newton), NASA (Chandra) and Jaxa (Hitomi). The NewAthena X-ray mission has been selected by ESA as the next Large mission. The telescope will have two main instruments on board: a Wide Field Imager and an X-ray spectroscopy instrument X-IFU (X-ray Integral Field Unit). The launch of NewAthena is planned for 2037.
SRON is responsible for developing the cryogenic Focal Plane Assembly (FPA) of the X-IFU instrument, which serves as the optical heart of the device. The Flight Model is expected to be delivered around 2035, and several prototype models will be developed to test the applied technologies.
The first FPA Demonstration Model, utilizing NASA detectors and NIST TDM readout, has been successfully assembled in SRON’s cleanroom and is now integrated into a cryogenic test setup that cools the detector stage to below 50 milli-Kelvin.
Concurrently, the SRON team is working on the X-IFU backup technology for the detector array and the read-out chain, which is based on a cutting-edge superconducting Transition Edge Sensor (TES) detector array operating at milli-Kelvin temperatures. The pixels are read out using Frequency Division Multiplexing (FDM). The readout chain operates at MHz frequencies and includes superconducting high-Q LC-filter chips, Superconducting QUantum Interference Devices (SQUIDs), and room temperature digital and analog electronics.
Besides NewAthena, SRON has a leading role in developing (microwave) superconducting detectors for future visible, near- and far-infrared radiation, and CMB space mission such as PRIMA, LiteBIRD and HWO.
Your position and team
As a key member of a team comprising instrument scientists and engineers, you will take a leading role in the program aimed at advancing the technology readiness level of the SRON X-ray microcalorimeter array and its frequency domain multiplexing readout. Additionally, you will participate in the on-going extensive testing campaign with the XIFU Focal Plane Assembly.
Your project
- You will be responsible for testing and qualification of the SQUID-based FDM readout and the characterization of the XIFU full size array consisting of over 1500 X-ray microcalorimeters fabricated in SRON state-of-the-art cleanroom.
- You will take part in testing the X-IFU FPA, including measurement planning, interpretation and reporting of the results. You will actively contribute to shaping the technology towards a flight instrument.
- You will operate the cryogenic He3/He4 dilution refrigerators and install and modify the test setups.
- You will contribute to the improvements of the measurement procedures and the data analysis pipeline.
- The focus of your role will depend on your previous experience relevant to the fields of interest.
Position requirements
- PhD degree in experimental (low temperature) physics and experience with superconducting electronics and (ultra) cryogenic facilities.
- The ideal candidate has experience with single photon X-ray detectors and instrument calibration.
- Excellent analytical and experimental skills
- Experience in developing room-temperature analog and digital electronics, software engineering, or nanofabrication is considered as a plus.
- Innovative and creative, and able to deliver within project constraints.
- Good verbal and written communication skills (in English).
- Team player, working well as part of a diverse team.
- Ability to work in a continuously changing environment.
Competences
- Accurate and reliable
- Judicious
- Takes initiative
- Result-driven
What we offer
Employment of this full-time position as an Instrument Scientist at SRON-Leiden is by NWO-I (The Netherlands Organization for Scientific Research Institutes) and will be for a period of two years with a possible extension for a longer period. The collective labor agreement for research institutions applies. Salary will depend on education and experience but will not exceed €8.285,-gross per month (salary level 1-1-2026). The position is based in Leiden, The Netherlands.
NWO-I has good secondary employment conditions such as:
- An end-of-year bonus of 8.33% of the gross yearly salary
- A holiday allowance of 8% of the gross yearly salary
- 42 days of vacation leave a year on a full-time basis
- An excellent pension scheme
- Options for (additional) personal development
- Excellent facilities for parental leave
- Ample training opportunities
- Possibility of flexible working hours
Why SRON
SRON's mission is to achieve breakthroughs in international scientific research from space. To this end, SRON develops cutting-edge technology and advanced space instruments. SRON promotes societal applications of space technology. We have a strong international reputation as 'excellent in space research'. The quality and societal relevance of our science is considered ‘world-leading’.
About SRON
SRON is the Netherlands Institute for Space Research. Based at locations in Leiden and Groningen, SRON combines fundamental scientific research, technology innovation, and instrumentation development to enable breakthroughs in astrophysics and earth atmospheric research from space. In partnership with major international partners and space agencies such as ESA, NASA and JAXA, SRON provides scientific and technological contributions to international space missions as well as expertise and support to the Dutch and international scientific communities.
SRON is the national base for the Netherlands participation in the ESA science program. On the national level, it works in close collaboration with the Dutch universities, other NWO institutes, and governmental agencies to pursue a cohesive agenda for space-based research.
For more information, please contact
More information about SRON can be found at www.sron.nl. For further information about the content of the position, please contact Dr, Luciano Gottardi, section head of the Instrument Scientists Cryo Group in Leiden, via email: l.gottardi@sron.nl, or Dr. Pourya Khosropanah, XIFU/NL Project Manager, email: P.Khosropanah@sron.nl.
Applications with cv and/or portfolio can be submitted until 31 March 2026 through our website www.werkenbijsron.nl. We will consider applications until the vacancies are filled.
