2-year postdoctoral fellowship available in the framework of the HOLMES experiment


The group at Università di Milano-Bicocca works on Low Temperature Detectors for Neutrino Physics and has one 2-year postdoctoral fellowship available in the framework of the HOLMES experiment.

HOLMES is an experiment funded with an Advanced Grant by the European Research Council (ERC) to measure directly the neutrino mass from the study of the Ho-163 electron capture decay. With its sub-eV sensitivity, HOLMES will be a crucial step forward in the direct neutrino mass measurement with a calorimetric approach as an alternative to spectrometry and it will also establish the potential of this approach to extend the sensitivity down to 0.1 eV.

HOLMES will deploy an array of 1000 Mo/Cu TES with Ho-163 nuclei implanted in the Bismuth absorbers. The target performances of the detectors are an energy resolution about 1 eV (at 2.6keV) and a rise time of few microseconds, with an Ho-163 counting rate of about 300 decays/s/pixel. The TES array is developed in collaboration with NIST (Boulder, Co, USA) and is fabricated in a two step process at NIST and INFN in Genova.

The detectors will be read-out using a microwave SQUID multiplexing device from NIST coupled to a ROACH2 based digital acquisition system. 
The first high statistics measurements of the Ho-163 spectrum are planned for late 2016.

While the TES array is the baseline of the HOLMES experiment, we are also engaged in the parallel development of lumped elements KIDs designed to detect EC decays of Ho-163 embedded in an absorber coupled to the inductor. KIDs are fabricated by the Micro Nano Facility of the Fondazione Bruno Kessler (FBK, Povo, Trento, Italia).

The HOLMES research program offers the possibility to participate and contribute to the development of the many cutting edge technologies involved. Presently, the main R&D topics in our activity are:

* Ho-163 implanted fast TES
* high bandwidth TES microwave SQUID multiplexing
* ROACH2 firmware for real-time data analysis
* analysis algorithms for high counting rate and high energy resolution
* KIDs for electron capture calorimetry (both in thermal and athermal mode)

HOLMES activities are carried out in our advanced cryogenic laboratory which hosts 4 dilution refrigerators, where also CUORE and CUPID R&Ds are in progress.

Candidates are expected to have experience in hands-on low temperature detectors development, digital signal processing, or FPGA programming.
The 2-year grant can be renewed.

http://artico.mib.infn.it/holmes
For more information please contact Angelo Nucciotti at angelo.nucciotti@mib.infn.it


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