Publication

The nine and a half years in-orbit operation performance of the silicon-tungsten tracker-converter of DAMPE

2025

Abstract

Since its launch, in December 2015, the space-based DArk Matter Particle Explorer (DAMPE) has been operating smoothly, continuously collecting data for more than nine and a half years. The Silicon-Tungsten tracKer-converter (STK) of DAMPE is designed to measure the absolute value of the charge and precisely reconstruct the trajectory of the incident charged particle. The STK consists of six tracking planes (6x, 6y) made of single-sided silicon micro-strip detectors, mounted on seven support trays. To further enhance photon conversion into electron-positron pairs (γ → e+e−), tungsten plates (1 mm thick) are embedded in the second, third, and fourth trays from the top. Commissioned rapidly after the launch, the STK has been functioning exceptionally well ever since. This contribution presents the in-orbit calibration and performance of the STK over its nine and a half years of operation, focusing on noise behaviour, as well as thermal and mechanical stability.

Official source

https://infoscience.epfl.ch/entities/publication/7404ddaa-9e48-4ccf-aad5-06fac7863e50

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7404ddaa-9e48-4ccf-aad5-06fac7863e50

About this result

Related concepts (32)

Electron–positron annihilation

Electron–positron annihilation occurs when an electron (_Electron) and a positron (_Positron, the electron's antiparticle) collide. At low energies, the result of the collision is the annihilation of the electron and positron, and the creation of energetic photons: _Electron + _Positron → _Photon + _Photon At high energies, other particles, such as B mesons or the W and Z bosons, can be created. All processes must satisfy a number of conservation laws, including: Conservation of electric charge.

Positron

The positron or antielectron is the particle with an electric charge of +1 e, a spin of 1/2 (the same as the electron), and the same mass as an electron. It is the antiparticle (antimatter counterpart) of the electron. When a positron collides with an electron, annihilation occurs. If this collision occurs at low energies, it results in the production of two or more photons. Positrons can be created by positron emission radioactive decay (through weak interactions), or by pair production from a sufficiently energetic photon which is interacting with an atom in a material.

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Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect. Various astrophysical observations - including gravitational effects which cannot be explained by currently accepted theories of gravity unless more matter is present than can be seen - imply dark matter's presence.

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The nine and a half years in-orbit operation performance of the silicon-tungsten tracker-converter of DAMPE

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