A very intense neutrino super beam experiment for leptonic CP violation discovery based on the European spallation source linac

Baussan, E.; Wurtz, J.; Koutchouk, J.P.; Coloma, P.; Lindroos, M.; Bogomilov, M.; Densham, C.; Blennow, M.; Ruber, R.; Dracos, M.; Fernandez Martinez, E.; Vankova-Kirilova, G.; Tang, J.Y.; Matev, R.; Cederkäll, J.; Wildner, E.; Miyamoto, R.; Öhman, H.; Poussot, P.; Mezzetto, M.; Peggs, S.; McGinnis, D.; Tsenov, R.; Gaudiot, G.; Ohlsson, T.; Vassilopoulos, N.; Hall-Wilton, R.; Christiansen, P.; Mosca, L.; Ekelöf, T.; Osswald, F.; Eshraqi, M.; Danared, H.; Bouquerel, E.; Cupial, P.

doi:10.1016/j.nuclphysb.2014.05.016

Article
Report number	arXiv:1309.7022
Title	A very intense neutrino super beam experiment for leptonic CP violation discovery based on the European spallation source linac
Author(s)	Baussan, E. (Strasbourg, IPHC) ; Blennow, M. (Royal Inst. Tech., Stockholm) ; Bogomilov, M. (Sofiya U.) ; Bouquerel, E. (Strasbourg, IPHC) ; Cederkäll, J. (Lund U.) ; Christiansen, P. (Lund U.) ; Coloma, P. (Virginia Tech.) ; Cupial, P. (AGH-UST, Cracow) ; Danared, H. (ESS, Lund) ; Densham, C. (Rutherford) ; Dracos, M. (Strasbourg, IPHC) ; Ekelöf, T. (Uppsala U.) ; Eshraqi, M. (ESS, Lund) ; Fernandez Martinez, E. (Madrid, IFT) ; Gaudiot, G. (Strasbourg, IPHC) ; Hall-Wilton, R. (ESS, Lund) ; Koutchouk, J.P. (CERN ; Uppsala U.) ; Lindroos, M. (ESS, Lund) ; Matev, R. (Sofiya U.) ; McGinnis, D. (ESS, Lund) ; Mezzetto, M. (INFN, Padua) ; Miyamoto, R. (ESS, Lund) ; Mosca, L. (Modane, Lab. Souterrain) ; Ohlsson, T. (Royal Inst. Tech., Stockholm) ; Öhman, H. (Uppsala U.) ; Osswald, F. (Strasbourg, IPHC) ; Peggs, S. (ESS, Lund) ; Poussot, P. (Strasbourg, IPHC) ; Ruber, R. (Uppsala U.) ; Tang, J.Y. (Beijing, Inst. High Energy Phys.) ; Tsenov, R. (Sofiya U.) ; Vankova-Kirilova, G. (Sofiya U.) ; Vassilopoulos, N. (Strasbourg, IPHC) ; Wildner, E. (CERN) ; Wurtz, J. (Strasbourg, IPHC)
Publication	2014-08
Imprint	26 Sep 2013
Number of pages	23
Note	Snowmass 2013 - Intensity Frontier Contributed papers Snowmass 2013 - Intensity Frontier Contributed papers 28 pages
In:	Nucl. Phys. B 885 (2014) 127-149
In:	Community Summer Study 2013 : Snowmass on the Mississippi, Minneapolis, MN, USA, 29 Jul - 6 Aug 2013, pp.127-149
DOI	10.1016/j.nuclphysb.2014.05.016
Subject category	Particle Physics - Experiment ; Accelerators and Storage Rings ; Detectors and Experimental Techniques
Abstract	Very intense neutrino beams and large neutrino detectors will be needed in order to enable the discovery of CP violation in the leptonic sector. We propose to use the proton linac of the European Spallation Source currently under construction in Lund, Sweden to deliver, in parallel with the spallation neutron production, a very intense, cost effective and high performance neutrino beam. The baseline program for the European Spallation Source linac is that it will be fully operational at 5 MW average power by 2022, producing 2 GeV 2.86 ms long proton pulses at a rate of 14 Hz. Our proposal is to upgrade the linac to 10 MW average power and 28 Hz, producing 14 pulses/s for neutron production and 14 pulses/s for neutrino production. Furthermore, because of the high current required in the pulsed neutrino horn, the length of the pulses used for neutrino production needs to be compressed to a few $\mu$s with the aid of an accumulator ring. A long baseline experiment using this Super Beam and a megaton underground Water Cherenkov detector located in existing mines 300-600 km from Lund will make it possible to discover leptonic CP violation at 5 $\sigma$ significance level in up to 50% of the leptonic Dirac CP-violating phase range. This experiment could also determine the neutrino mass hierarchy at a significance level of more than 3 $\sigma$ if this issue will not already have been settled by other experiments by then. The mass hierarchy performance could be increased by combining the neutrino beam results with those obtained from atmospheric neutrinos detected by the same large volume detector. This detector will also be used to measure the proton lifetime, detect cosmological neutrinos and neutrinos from supernova explosions. Results on the sensitivity to leptonic CP violation and the neutrino mass hierarchy are presented.
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