CALDER (Cryogenic wide-Area Light Detectors with Excellent Resolution)

CALDER  is  a  project  for  the  development  of  large-area, phonon-mediated detectors for the detection of visible-UV light with excellent resolution. These detectors are needed in various particle physics experiments that try to answer to basic questions, like whether the neutrino is a Dirac or a Majorana particle or what is the dark matter of the Universe made of : all experiments that relay on the study of neutrino or dark matter interactions and hence require a very sensitive detection approach.  
CALDER was born to support two INFN large-mass bolometric experiments, CUORE and LUCIFER, both hosted at the Gran Sasso National Laboratories in Italy and searching for the  neutrinoless double beta decay (0νDBD). CALDER is expected to provide superconducting bolometric detectors, based on the principle of KIDs (Kinetic Inductance Detectors), with the following characteristics:
Technology: phonon mediated KID (Kinetic Inductance Detectors)
Large area: 5x5 cm2  sampled by ~10 pixels
Energy resolution: < 20 eV RMS
Time resolution:  ~10 ms
Position resolution: not important
Working temperature: 10 mK
Very low radioactive contamination
Scalable to 1000 detectors

Within CALDER, CNR-IFN is in charge of the KIDs fabrication (by means of thin-film techniques and e-beam lithography) and of setting up new materials, like sub-stoichiometric TiN, that would further improve the intrinsic KID sensibility thanks to their superconducting properties.              A chip with 9 KID resonators, mounted in its holder.
Left: A 3 inches silicon wafers with several chips, after cutting.  
Right: A single chip (2 cm x 2 cm) with 9 KID resonators, mounted in its holder.

Project Funding: ERC- Starting Grant- FP7 335359

Duration: 48 months (march 2013-2017)