The High Energy X-ray telescope (HE) onboard the Insight-HXMT astronomy satellite

Understand

The Insight-Hard X-ray Modulation Telescope (Insight-HXMT) is a broad band X-ray and gamma-ray (1-3000 keV) astronomy satellite.

• The High Energy X-ray telescope (HE) is one of its three main telescopes.
• The main detector plane of HE is composed of 18 NaI(Tl)/CsI(Na) phoswich detectors, where NaI(Tl) serves as primary detector to measure ~ 20-250 keV photons incident from the field of view (FOV) defined by the collimators, and CsI(Na) is used as an active shield detector to NaI(Tl) by pulse shape discrimination.
• CsI(Na) is also used as an omnidirectional gamma-ray monitor.