Abstract
We describe a novel configuration for a neutrino beam line that can simultaneously support both long and short baseline experiments. The neutrino beams originate from pions that are first focused by a magnetic horn, as in a conventional neutrino beam. However, in the case of nuPIL, the horn is followed by a magnetic lattice that is used to select the pion charge and then transports the pions in a production straight. This produces extremely pure neutrino and anti-neutrino beams, while minimizing the amount of beam power that is transported underground for the long-baseline physics program. This configuration greatly simplifies the civil construction leading to a large cost reduction. The principles of the design of nuPIL are presented, together with tracking results and the resulting neutrino flux. The potential of the facility for CP-violation searches, in the framework of the DUNE experiment, is discussed and compared to that of an optimized beam from LBNF.
Highlights
The LBNF decay pipe points toward detectors placed at the Sanford Underground Research Facility (SURF) in South Dakota, about 1300 km away, so the tunnel is tilted with a vertical angle of 5.8 deg
The target is tilted and a hill needs to be built to transport the primary proton beam so it hits the target with the correct angle
The primary proton beam would hit the target on the surface, a horn would collect the resulting pions
Summary
The LBNF decay pipe points toward detectors placed at the Sanford Underground Research Facility (SURF) in South Dakota, about 1300 km away, so the tunnel is tilted with a vertical angle of 5.8 deg. Since all forwarding particles would enter the decay tunnel, kaon decays and wrong-sign pion decays will produce neutrinos that can reach the detector, creating a background signal. The primary proton beam would hit the target on the surface, a horn would collect the resulting pions They would be transported in a 5.8 deg beam line bend and injected into a decay beam line. This paper will present the preliminary results of the nuPIL concept
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