New superconducting X-ray detector is up to 1,000 times more sensitive - Date: - June 24, 2026 - Source: - Helmholtz-Zentrum Berlin für Materialien und Energie - Summary: - A groundbreaking superconducting X-ray spectrometer has begun operation at BESSY II, giving Europe its first TES-based system and boosting photon detection efficiency by up to 1,000 times. The advance enables scientists to explore atomically thin materials, nanostructures, and ultra-dilute samples with remarkable speed and sensitivity. - Share: A major new tool for X-ray research has entered service at BESSY II. Developed through a collaboration between HZB, MPI-CEC (Mühlheim-an-der-Ruhr, Germany), and NIST (Boulder CO, USA), the instrument is the first and only TES spectrometer operating at a synchrotron facility in Europe. The new system delivers a dramatic improvement in photon detection efficiency, outperforming conventional wavelength-dispersive X-ray emission spectrometers by a factor of 100 to 1000. Researchers plan to use it to study the electronic properties of atomically thin materials, nanostructures, and highly diluted atomic and molecular samples. The team is now inviting research proposals from the scientific community. Bringing Greater Sensitivity to X-Ray Spectroscopy Facilities such as BESSY II generate extremely bright and intense synchrotron X-rays that allow scientists to analyze a wide range of materials. Yet techniques such as X-ray emission spectroscopy (XES) and Resonant Inelastic X-ray Scattering (RIXS) face a significant challenge. Because these methods rely on detecting photons emitted by the sample, they require large numbers of photons to produce useful measurements. As a result, XES and RIXS experiments have traditionally been limited to concentrated samples and bulk materials. "The superconducting Transition Edge Sensor (TES) array photon detector that we have now put into operation at BESSY II is around 100 to 1000 times more efficient to detect photons than conventional XES and RIXS spectrometers," says Régis Decker, HZB,