Preliminary Design of Detector Assembly for DIXE

TL;DR

This paper presents the preliminary design and optimization of the detector assembly for DIXE, focusing on thermal, magnetic, and optical shielding to enhance X-ray spectroscopic performance in space.

Contribution

It introduces a comprehensive design for the detector assembly, including thermal isolation, magnetic shielding, and optical filtering, tailored for space-based X-ray spectroscopy.

Findings

Design effectively reduces magnetic interference.

Optical filters minimize photon noise.

Thermal isolation maintains detector stability.

Abstract

Diffuse X-ray Explorer (DIXE) is a proposed X-ray spectroscopic survey experiment for the China Space Station. Its detector assembly (DA) contains the transition edge sensor (TES) microcalorimeter and readout electronics based on the superconducting quantum interference device (SQUID) on the cold stage. The cold stage is thermally connected to the ADR stage, and a Kevlar suspension is used to stabilize and isolate it from the 4 K environment. TES and SQUID are both sensitive to the magnetic field, so a hybrid shielding structure consisting of an outer Cryoperm shield and an inner niobium shield is used to attenuate the magnetic field. In addition, IR/optical/UV photons can produce shot noise and thus degrade the energy resolution of the TES microcalorimeter. A blocking filter assembly is designed to minimize the effects. In it, five filters are mounted at different temperature stages, reducing the probability of IR/optical/UV photons reaching the detector through multiple reflections between filters and absorption. This paper will describe the preliminary design of the detector assembly and its optimization.