Abstract
We present a working concept for Phase III of the Project 8 experiment, aiming to achieve a neutrino mass sensitivity of 2 eV (90 % C.L.) using a large volume of molecular tritium and a phased antenna array. The detection system is discussed in detail.
Highlights
One 5-cm radius ring of 30 elements can provide a 10-dB SNR, which is sufficient for triggering purposes
For the 16-element ring, the focusing point is not unique, and one cannot determine the exact position of a detected electron
In order to increase the instrumented volume, we propose to use two 5-cm radius rings of 30 elements each, separated by 4-5 cm which can provide a 10-dB SNR
Summary
2. Phased Array of Antennas One can achieve Phase III sensitivity after one year of data taking with a 200 cm[3] volume of tritium gas at a density of 3 × 1012 molecules per cm[3] and a trapping efficiency of 5 %. The radiation can be collected using a ring-shaped array of antennas. By appropriately phasing the antennas, one can focus the signal detection to a 1 mm diameter region of the detector.
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