Characterisation of a TES-Based X-ray Microcalorimeter in the Energy Range from 150 to 1800 eV Using an Adiabatic Demagnetisation Refrigerator

TL;DR

This study characterizes a TES-based X-ray microcalorimeter using synchrotron radiation in an ADR, demonstrating energy resolution between 1.5 and 2.1 eV across 200-1800 eV with high count-rate capability.

Contribution

It provides detailed measurements of the detector's energy resolution and performance in the specified energy range using an ADR, which is novel for this type of detector.

Findings

Energy resolution ranges from 1.5 to 2.1 eV

Detector maintains performance at 500 counts/sec

Weak dependence of resolution on working point

Abstract

We characterised a TES-based X-ray microcalorimeter in an adiabatic demagnetisation refrigerator (ADR) using synchrotron radiation. The detector response and energy resolution was measured at the beam-line in the PTB radiometry laboratory at the electron storage ring BESSY II in the range from 200 to 1800 eV. We present and discuss the results of the energy resolution measurements as a function of energy, beam intensity and detector working point. The measured energy resolution ranges between 1.5 to 2.1 eV in the investigated energy range and is weakly dependent on the detector set point. A first analysis shows a count-rate capability, without considerable loss of performance, of about 500 counts per second.