- TWiki page with a collection of approved physics results
- Standard detector description (latex)
SND@LHC is designed to perform measurements with high-energy neutrinos (100~GeV--1~TeV)
produced at the LHC in the pseudo-rapidity region $7.2 < \eta < 8.6$. It allows
the identification of all three flavours of neutrino interactions with high efficiency.
The detector is located 480~m downstream of interaction point IP1 in the TI18 tunnel.
SND@LHC is a compact hybrid apparatus \cite{...}, shown in \figurename~\ref{....}.
It consists of three parts: the veto, target and muon systems. The veto detector
is situated in front of the target region. It is made of two vertically shifted planes
of seven $42 \times 6 \times 1$~cm$^3$ scintillating bars and it identifies muons
arriving from IP1. The target section contains five walls. Each wall consists of four
units of emulsion cloud chambers (ECCs) and it is followed by a Scintillator Fibre
tracker (SciFi) station. The muon system is placed downstream of the target. The
electronic detectors provide the time stamp of the neutrino interaction, preselect
the interaction region, identify muons and measure their charge and momentum.
The sub-micrometric precision of nuclear emulsions allows the detection of
short-lived particles like tau leptons. Each ECC module is a sequence of 60 emulsion
films, $19.2 \times 19.2$ cm$^2$, interleaved with 59 1~mm thick tungsten plates.
Its weight is approximately 41.5~kg, adding up to 830~kg for the total target mass.
Each SciFi station consists of five $40 \times 40$ cm$^2$ $x$-$y$ planes of staggered
scintillating fibres with a diameter of 250~$\mu$m. To control the fading of emulsion
films, the temperature of the target is kept at $15 \pm 1$~\textdegreesymbol~C and
the relative humidity in 50--55\% range in a cold box enclosing the whole target
region. The walls of the box have a borated polyethylene layer to shield against
beam gas induced neutrons. The spatial resolution of single hits, about 50~$\mu$m,
is sufficient to link hits with an interaction in an ECC. A time resolution of the
order of $\sim$250~ps allows to disentangle the scattering of Feebly Interacting
Particles (FIPs) from neutrinos.
The muon system consists of two parts: upstream (US), the first five stations,
and downstream (DS), the last three stations. In combination with SciFi, it acts
as a coarse sampling calorimeter ($\sim$9.5 interaction lengths), providing the
energy measurement of hadronic jets. Each US station consists of 10 stacked horizontal
scintillator bars of $82.5 \times 6 \times 1$~cm$^3$, similar to the upstream veto
detector. The DS part consists of two layers of thin bars, one horizontally and one
vertically arranged, allowing for a spatial resolution less than 1~cm. The
scintillating planes are interleaved with 20~cm thick iron blocks.
