X-ray spectroscopy is an important method in exploring the material composition and elemental properties. Traditional spectrometers in X-ray spectroscopy include wavelength-dispersive type and semiconductors-based energy-dispersive type. The former possesses high energy resolution but low collecting efficiency and narrow spectral band coverage, while the latter is more efficient and wider in spectral range but give relatively low energy resolution. Spectrometers based on microcalorimeters serve as a new class of energy-dispersive type spectrometers which balance the performance in energy resolution, detection efficiency, and spectral coverage, making them promising in many spectroscopy applications. The superconducting transition-edge sensor (TES) is a representative class of maturely developed microcalorimeters success in array fabrication and readout. We are developing TESs-based X-ray spectrometer at ShanghaiTech University aiming at the application in advanced X-ray light source, like synchrotron radiation or free electron laser facilities. Recently, a prototype has been set up and started running in the lab. This paper introduces a systematic work on data processing with this prototype, focusing on both data acquisition and analysis. With optimization on both hardware and analysis, we have achieved resolution better than 7 eV in the range from 2 keV to 9 keV on the prototype.
In order to meet the demand of X-ray spectroscopy measurement for SHINE and other X-ray light source projects, a multi-pixel TES X-ray spectrometer with high counting rate is currently being developed by the joint team of ShanghaiTech University and Shanghai Institute of Microsystem and Information Technology, etc. Recently, a 16-pixel prototype chip has been completed. With the long-term goal to build a set of X-ray spectrometer with more than 100 channels, which can be applied for the energy band of 0.3 -20 keV. In the mean time, a calibration system constructed, TES based X-ray detector of SBP tested on this system, energy resolution of 5.2 eV@5.9 keV has been obtained.
The Hot Universe Baryon Surveyor (HUBS) mission is proposed to study “missing” baryons in the universe. Unlike dark matter, baryonic matter is made of elements in the periodic table, and can be directly observed through the electromagnetic signals that it produces. Stars contain only a tiny fraction of the baryonic matter known to be present in the universe. Additional baryons are found to be in diffuse (gaseous) form, in or between galaxies, but a significant fraction has not yet been seen. The latter (“missing” baryons) are thought to be hiding in low-density warm-hot ionized medium (WHIM), based on results from theoretical studies and recent observations, and be distributed in the vicinity of galaxies (i.e., circumgalactic medium) and between galaxies (i.e., intergalactic medium). Such gas would radiate mainly in the soft X-ray band and the emission would be very weak, due to its very low density. HUBS is optimized to detect the X-ray emission from the hot baryons in the circumgalactic medium, and thus fill a void in observational astronomy. The goal is not only to detect the “missing” baryons, but to characterize their physical and chemical properties, as well as to measure their spatial distribution. The results would establish the boundary conditions for understanding galaxy evolution. Though highly challenging, detecting “missing” baryons in the intergalactic medium could be attempted, perhaps in the outskirts of galaxy clusters, and could shed significant light on the large-scale structures of the universe. The current design of HUBS will be presented, along with the status of technology development.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.