INFN - Sezione di Roma
DOE/INFN Summer Exchange Program for 2017

1 position: CALDER

Title: High-sensitivity cryogenic light detectors

Description: The goal of CALDER is to develop high-sensitivity cryogenic light detectors for the identification of rare events, such as double beta decay and dark matter interactions with ordinary matter. We are developing a new technology based on superconducting detectors called KIDs (Kinetic Inductance Detectors). We are currently designing and testing the prototypes in the Sapienza/INFN laboratory in Rome, in collaboration with the Italian Institute for Photonics and Nanotechnologies. The student will be involved in the lab activities: cryostat operations, electronics setup, detector characterisation and data analysis.

Tutors: Marco Vignati (marco.vignati@roma1.infn.it)

Recommended period: June-July and/or September-October 2017

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1 position: CUPID

Title: Search for neutrinoless double beta decay of 82Se with CUPID

Description: Neutrinoless double beta decay is a hypothetical lepton number violating process in which two neutrons in an atomic nucleus simultaneously decay to two protons, two electrons, and no electron-antineutrinos. Its discovery would establish the Majorana nature of the neutrino. CUPID is a cryogenic detector that exploits the dual readout heat/light in an array of 26 ZnSe bolometers, cooled down to 10 mK in a dilution refrigerator cryostat installed underground in the Laboratori Nazionali del Gran Sasso. CUPID has started taking data In January 2017. The student will be involved in the optimization of the analysis and the development of tools and algorithms. Computing Knowledge: Ability to work in a Unix environment and program in C/C++, knowledge of ROOT/ROOFIT package.

Tutors: Fabio Bellini (fabio.bellini@roma1.infn.it)

Recommended period: June-July and/or September-October 2017

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2 positions: CUORE

Title: Search for neutrinoless double beta decay of 130Te with CUORE

Description: Neutrinoless double beta decay is a hypothetical lepton number violating process in which two neutrons in an atomic nucleus simultaneously decay to two protons, two electrons, and no electron-antineutrinos. Its discovery would establish the Majorana nature of the neutrino. CUORE is a cryogenic detector made by an array of 988 TeO2 bolometers arranged in 19 towers, cooled down to 10 mK in a dilution refrigerator cryostat installed underground in the Laboratori Nazionali del Gran Sasso. CUORE has started taking data In January 2017. The students will be involved in the optimization of the analysis and the development of tools and algorithms. Computing Knowledge: Ability to work in a Unix environment and program in C/C++, knowledge of ROOT/ROOFIT package.

Tutors: Claudia Tomei (claudia.tomei@roma1.infn.it)

Recommended period: June-July and/or September-October 2017

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1 position: SABRE

Title: Geant4 simulations of external background for the SABRE experiment

Description: SABRE is a project for a new Dark Matter experiment to search for the annual modulation signal with ultra-high-purity NaI(Tl) crystals. One key feature of the project is the use of an active liquid scintillator veto around the NaI(Tl) crystals. The veto will serve a double purpose. The first aim is to reject the low energy background coming from the ~3keV X-ray cascade that follows the 40^K EC decays inside the scintillating crystals, by tagging the 1460 keV gamma emitted in coincidence. The second aim is to provide a veto for the external background coming from muons, gammas and neutrons (environmental and muon-induced). The student will be involved in Geant4 simulations ad in the analysis of the simulated data to study the contribution of the external background to the SABRE design and the sensitivity reach of the experiment.

Computing Knowledge: Ability to work in a Unix environment and program in C/C++, basic knowledge of Geant4 is not required although beneficial.

Tutor: Claudia Tomei (claudia.tomei@roma1.infn.it)

Recommended period: June-July or September-October 2017

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1 position: MEG experiment

Title: Development of the calibration and monitoring system of the MEG-II drift chamber

Description: The MEG-II collaboration is carrying on a leading experiment for the search of New Physics in the charged Lepton Flavor Violating decay mu -> e gamma. The upgraded MEG-II detector will start physics data taking in 2018 for a period of three calendars years at the Paul Scherrer Institute near Zurich (Switzerland). The MEG-II drift chamber is currently being wired at INFN-Lecce and assembled at INFN-Pisa. The chamber will be sealed in August and successively tested in Pisa and shipped to PSI. The student will work with the members of the Rome group in the development of calibration and monitoring tools and algorithms for this detector, in the framework of the MEGII software (C++ and ROOT based).

Tutors: Francesco Renga (francesco.renga@roma1.infn.it), Cecilia Voena (cecilia.voena@roma1.infn.it)

Recommended period: June-July OR September-October

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1 position: Darkside-20K experiment

Title: Study of the sensitivity of a Liquid Argon Time Projection Chamber to the directional detection of dark matter signals.

Description: The direct search for dark matter interactions on nuclei is one of the main goals of astro-particles physics in the Gran Sasso Underground Laboratory. A future large experiment (DS20K) using as a target 20 tons of liquefied low radioactivity argon is under advanced design status. A key feature that is desired for a future generation experiment is the capability of detecting the incoming direction of the dark matter particles, that are expected to come primarily from a distinct direction in space. The student will be involved in performance studies of the proposed DS20K readout and in the preparation of a dedicated experiment using monochromatic neutrons designed to investigate the directional sensitivity in a Liquid Argon dark matter detector.

Tutors: Marco Rescigno (marco.rescigno@roma1.infn.it)

Recommended period: June-July

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1 position: Darkside-20K experiment

Title: Study and implementation of Machine Learning algorithms for 3D event reconstruction in the Liquid Argon Time Projection Chamber of the DarkSide-20k experiment.

Description: The direct search for dark matter interactions on nuclei is one of the main goals of astro-particles physics in the Gran Sasso Underground Laboratory. A future large experiment (DS20K) using as a target 20 tons of liquefied low radioactivity argon is under advanced design status. Machine learning and in particular Deep learning has attracted tremendous attention from researchers in various felds of information engineering such as AI, computer vision, and language processing, but also from more traditional sciences such as physics. Neural networks, image processing tools such as convolutional neural networks, sequence processing models such as recurrent neural networks, and regularisation tools such as dropout, are used extensively for 2D and 3D image recognition and seems appropriate for fast and precise reconstruction (both offline and in real-time) of HEP events collected in large scale time projection chambers like the one foreseen for the DS20K experiment. The student will be involved in the development and in the evaluation of the performances of a Deep Learning Convolutional Neural Networks (DLCNN) implemented in advanced multicore processors (GPUs) trained in samples of simulated events expected from DarkMatter and different backgrounds in the DS20K experiment.

Tutors: Stefano Giagu (stefano.giagu@roma1.infn.it)

Time period: 1/1.5 months from June 1st to end of July, or from September 1st to middle of October.

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1 position: DAΦNE BTF

Title: Dark photon searches with positron fixed target experiments at the Frascati BTF

Description: Massive photon-like particles are predicted in many extensions of the Standard Model. They have interactions similar to the photon, are vector bosons, and can be produced together with photons. The proposed experiment aims at searching for the dark photon (U) in the e+e− → γU process in a positron-on-target experiment, exploiting the positron beam of the DAΦNE BTF, produced by the linac at the Laboratori Nazionali di Frascati, INFN. In six months of running in 2018 a sensitivity in the relative interaction strength down to 10^−6 is achievable, in the mass region from 2.5 MeV < M_U< 22.5 MeV, by searching for a peak above the background (mainly Bremsstrahlung, and 2 or 3 photons) in the missing mass spectrum, obtained by the precision measurement of the recoiling photon by means of BGO crystals calorimeter.

The students will work on the fast digitizing readout electronics, DAQ as well as on the analysis tools of the experiment.

Required knowledge
(1) basic software and programming (C and C++preferred), statistics, basic particle physics
(2) basic instrumentation for HEP and experimental particle physics (lab experience preferred), basic electronics

Tutor: Paolo Valente (paolo.valente@roma1.infn.it)

Recommended period: June-July or September-October


Scientific Coordinator: Shahram Rahatlou
(tel +390649914357 - email: shahram.rahatlou@roma1.infn.it)

Local Secretariat:
Mauro Mancini
(tel. +390649914318 - email: mauro.mancini@roma1.infn.it)