Bastia, PaoloPaoloBastiaChiari, MassimoMassimoChiariGatti, FlavioFlavioGattiKhosropanah, PouryaPouryaKhosropanahLO CICERO, UGOUGOLO CICEROPhelan, KevinKevinPhelan2024-05-082024-05-082022http://hdl.handle.net/20.500.12386/35107This document reports the set of requirements for the design and construction of the TES X-ray spectrometer prototype to be realized in the frame of the AHEAD2020 project WP15. These requirements have been identified, discussed and agreed by the WP15 partecipants during a series of meeting from the project start. For the main scientific requirements a verification method is proposed within this document to provide a guide for the test and integration phase. The document also shows some design implementation details with the purpose of better describe what the requirements are aimed to.ELETTRONICOenResearch report