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Abstract:

Recent advances in physics of particles accelerators and lasers have shifted dramatically the expectations of bunch length and capability to generate electron bunches with specific longitudinal profiles [1,2]. This has stimulated interest in analysis of spectrum of coherent radiation to enable the longitudinal bunch profile diagnostics at femtosecond-scale. Spectral analysis of coherent Smith- Purcell radiation (cSPr) is particularly relevant as it allows non-invasive and cost-effective monitoring of electron bunch profiles. In this paper, the recent results observed from the E203 experiment (FACET, SLAC) are presented. Consistency of the cSPr as diagnostic tool is discussed, as well as the properties of cSPr such as directionality and polarization.

Abstract:

SNO+ is a large liquid scintillator-based experiment located 2km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of a 12m diameter acrylic vessel which will be filled with about 780 tonnes of ultra-pure liquid scintillator. Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0$\nu\beta\beta$) of 130Te. In Phase I, the detector will be loaded with 0.3% natural tellurium, corresponding to nearly 800 kg of 130Te, with an expected effective Majorana neutrino mass sensitivity in the region of 55-133 meV, just above the inverted mass hierarchy. Recently, the possibility of deploying up to ten times more natural tellurium has been investigated, which would enable SNO+ to achieve sensitivity deep into the parameter space for the inverted neutrino mass hierarchy in the future. Additionally, SNO+ aims to measure reactor antineutrino oscillations, low-energy solar neutrinos, and geoneutrinos, to be sensitive to supernova neutrinos, and to search for exotic physics. A first phase with the detector filled with water will begin soon, with the scintillator phase expected to start after a few months of water data taking. The 0$\nu\beta\beta$ Phase I is foreseen for 2017.