AGATA: Performance of the Demonstrator Array

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For more information on the simulation code and to obtain the actual code contact Enrico Farnea

Last updated: November 8th 2005

The AGATA Demonstrator

The AGATA Demonstrator Array is an arrangement of five triple clusters of the same kind which will be used to form the final A180 Configuration of AGATA. The performance of such an object will depend in a critical way on its placement relative to the target position. In particular, given the lack of a spherical symmetry, it is sensible to place the detectors closer to the target position compared to the "reference" distance being the target-detector distance of the full A180 Configuration, that is, 23.5 cm. The photopeak efficiency and the P/T ratio as a function of the shift from the geometrical centre are shown in the following plots, where it is assumed that 1 MeV photons are emitted from a point source at rest in the Laboratory reference frame:

The shift from the geometrical centre is calculated assuming to move the Demonstrator as a whole towards the source position. Here and in the following plots, the tracking has been performed with the mgt code, assuming a position resolution of 5 mm FWHM for 100 keV photons, with an inverse dependence on the square root of the photon energy. The photopeak efficiency for a 30 photon rotational band is shown instead in the following plot:
Given the assumed position resolution, the quality of the spectra is not lost even if quite high source velocities are assumed, as shown in the following plot:
Placing the Demonstrator Array in the forward position, its photopeak efficiency will reflect the Lorentz boost of the photons as shown in the following plot: