The TES cryogenic detectors, due to their high spectral resolution andimaging capability in the soft X-ray domain, are the reference devices for the nextproposed space missions whose aims are to characterize the spectra of faint or diffusesources. ATHENA is the re-scoped IXO mission, and one of its focal plane instrumentis the X-rayMicrocalorimeter Spectrometer (XMS) working in the energy range 0.3–10 keV. XMS will be able to achieve the proposed scientific goals if a backgroundlower than 0.02 cts/cm2/s/keV is guaranteed. The studies performed by GEANT4simulations depict a scenario where it is mandatory to use an active Anti-Coincidence(AC) to reduce the expected background in the L2 orbit down to the required level.This is possible using a cryogenic AC detector able to provide a rejection efficiencyof about 99%.We are developing for this purpose a TES-based detector made by Siliconabsorbers (total assembled area about 1 cm2 and 300 μm thick) and sensed by aIr:Au TES. All the work done for IXO is applicable to ATHENA, with more margins due to the smaller area required for the detector. Here we present the results obtainedfrom different samples, as a step towards the final detector design.
|Numero di pagine||12|
|Rivista||Journal of Low Temperature Physics|
|Stato di pubblicazione||Published - 2012|
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