Typ

Artikel in einem Journal

Gebiet

Detektorentwicklung

Autor

T. Schiffer, S. Schmidt, K. Desch, J. Kaminski, C. Krieger, …, T. Schiffer, S. Schmidt, K. Desch, J. Kaminski

Titel

Construction and characterization of a seven-chip GridPix X-ray detector for solar axion searches

Datum

2026-03

Reportnummer

—

Kurzfassung

In the scope of solar axion searches, detectors which are able to measure low energetic X-rays with high efficiency are required. For this purpose a detector based on the GridPix technology was built for the CAST experiment at CERN. The GridPix is a pixelized readout ASIC (Timepix) with a Micromegas-like gas amplification stage (grid) built photolithographically on top. In order to reduce the detector’s background level, several hardware and software vetoes were implemented. Hardware-wise, these vetoes consist of six GridPixes surrounding the central GridPix, a readout of the induced grid signal, and two scintillators for cosmic muon detection. On the software side, multiple approaches to distinguish between background events and X-rays are implemented, making use of the information from the new detector components. The new detector was tested in a long (3500h) background data taking campaign. The performance of the new vetoes was evaluated. The detector performance itself, for low energetic X-rays, was also evaluated with a variable X-ray generator using eight different energies from 0 to 10 keV. The energy resolution was determined as a function of photon energy and ranges between 26% and 7% for 0.27-8.04 keV

Link

https://doi.org/10.1016/j.nima.2026.171504

Journal

10.1016/j.nima.2026.171504