Spectrometer for ultrashort X-ray based on scintillator and optical fiber: proof of principle study

An active filter stack spectrometer based on the scintillator and optical fiber is proposed and characterized for measuring the ultrashort X-ray spectrum. The active filter stack spectrometer consists of multiple detection modules, each of which has three components: a scintillator, an optical fiber, and a PMT. After simulation optimization of the detection module for better coupling efficiency, a detection module was fabricated and assembled for subsequent coupling efficiency measurements. Two proof-of-principle experiments using an X-ray source were conducted to validate the feasibility of this active filter stack spectrometer.