Tracker-In-Calorimeter (TIC): a calorimetric approach to tracking gamma rays in space experiments. (arXiv:2008.01390v2 [physics.ins-det] UPDATED)
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A multi-messenger, space-based cosmic ray detector for gamma rays and charged
particles poses several design challenges due to the different instrumental
requirements for the two kind of particles. Gamma-ray detection requires layers
of high Z materials for photon conversion and a tracking device with a long
lever arm to achieve the necessary angular resolution to separate point
sources; on the contrary, charge measurements for atomic nuclei requires a thin
detector in order to avoid unwanted fragmentation, and a shallow instrument so
to maximize the geometric factor. In this paper, a novel tracking approach for
gamma rays which tries to reconcile these two conflicting requirements is
presented. The proposal is based on the Tracker-In-Calorimeter (TIC) design
that relies on a highly-segmented calorimeter to track the incident gamma ray
by sampling the lateral development of the electromagnetic shower at different
depths. The effectiveness of this approach has been studied with Monte Carlo
simulations and has been validated with test beam data of a detector prototype.

A multi-messenger, space-based cosmic ray detector for gamma rays and charged
particles poses several design challenges due to the different instrumental
requirements for the two kind of particles. Gamma-ray detection requires layers
of high Z materials for photon conversion and a tracking device with a long
lever arm to achieve the necessary angular resolution to separate point
sources; on the contrary, charge measurements for atomic nuclei requires a thin
detector in order to avoid unwanted fragmentation, and a shallow instrument so
to maximize the geometric factor. In this paper, a novel tracking approach for
gamma rays which tries to reconcile these two conflicting requirements is
presented. The proposal is based on the Tracker-In-Calorimeter (TIC) design
that relies on a highly-segmented calorimeter to track the incident gamma ray
by sampling the lateral development of the electromagnetic shower at different
depths. The effectiveness of this approach has been studied with Monte Carlo
simulations and has been validated with test beam data of a detector prototype.

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