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Alec Aivazis renamed nova-neutrino.tex to nova neutrino.tex
almost 10 years ago
Commit id: fe1656302ae381492b846a18b3d0fefdba5aa06f
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\subsection{Neutrino source}
The NuMI beam used by NO$\nu$A is fueled by proton collisions that are harnessed by an 8 GeV Booster accelerator and stored in the Main Injector ring. Small ortions of the Main Injector beam are diverted using 6 sets of magnets and directed down a 350m long path to the NuMI sector where it is focused to a graphite cylinder with dimensions of $6.4\rm{x}15\rm{x}940 \rm{mm}^3$. At the point of contact, the beam is 1mm in diameter. The graphite target is separated into 47 different fins each individually cooled in a stainless steel vacuum canister \cite{Patterson_2012}.
The pions that are emitted as a result of the decay are focused by two magnetic horns with maximum of 30 kG of magnetic field, produced by 200 kA of current, direct the positive pions into a 675m long steel pipe, 2m in diameter and evacuated out to ~1 Torr. At the end of the pipe is a beam absorber consisting of water-cooled aluminum cells surrounding a 1m steel block \cite{Patterson_2012}.
For increased adjustability, the target is mounted on a rail system that allows for around 8 feet of movement in the beam direction \cite{Kopp_2004}. Following the decay outlined in section \ref{sect:theory}, the pions that make it through eventually decay into a muon and a muon neutrino. Since there is so much more energy in the beam direction than the rest mass of the particles, the pair can be treated as moving along the beam direction \cite{Patterson_2012}.
