NF poster

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UK Neutrino Factory Conceptual Design
Stephen Brooks, Christopher Prior ASTeC Intense
Beams Group, RAL s.j.brooks_at_rl.ac.uk
Physics Motivation The discovery of neutrino
masses requires the standard model of physics to
be modified. Measuring their mass precisely is
one of the few ways a new theory can be
constrained. The mass differences between
neutrino flavours cause oscillation from one type
to another with a wavelength proportional to
D(Mass2)(Baseline)/(Energy), meaning baselines
in the gt1000km range are needed for the best
detectable gt10GeV neutrinos. Staging Scenario (UK
Case) The neutrino factory complex could be built
up in stages upgrades to the ISIS proton
synchrotron at RAL could supply both the neutrino
factory and enhanced flux for existing neutron
and muon science. The neutrino factory could
itself be upgraded to a multi-TeV muon collider,
which would have high-energy particle physics
capabilities surpassing the LHC and ILC in
several areas.
This diagram shows the main subsystems of the
neutrino factory. Four areas are highlighted in
which the UK will perform key technology
demonstrations within the next five years.
Proton Driver Front End
180MeV H- Linac

• Proton Driver
• Required energy 5-15GeV
• Repetition rate 50Hz
• Mean power 4-5MW
• 3-6 bunches formed
• Compressed to 1-3ns RMS ? Peak power 8-60TW

H- Ion Source
LEBT at 35keV
RFQ to 3MeV
Beam Chopper
324MHz Drift Tube Linac (DTL) to 90MeV
972MHz Side-Coupled Linac (SCL) to 180MeV
Achromat for removing beam halo
Proton Driver Front-End Test Stand (FETS)

• Two Stacked Proton Synchrotrons (full energy)
• 6GeV
• 78m mean radius
• Each operating at 25Hz, alternating for 50Hz
  total

See also FETS poster
A prototype of the first stages in a high power
proton driver is being constructed at RAL.
Muon Ionisation Cooling Experiment (MICE) This
project will construct a fully-engineered cooling
cell with diagnostics and test its performance
using muons extracted from the ISIS beam.
Stripping Foil (H- to H/protons)

• Two Stacked Proton Synchrotrons (boosters)
• 1.2GeV
• 39m mean radius
• Both operating at 50Hz

Present 2010s 2020s 2030s
Proton Power 150kW 1MW ? 2.5MW ? 5MW 1MW ? 2.5MW ? 5MW
Neutron Science ISIS ISIS MW Upgrades ESS-class Machine
Neutrino Physics Neutrino Factory
Fundamental Higgs Physics Muon Collider
Solenoidal Decay Channel (in which pions decay to
muons)
Muon Cooling Dogbone
Solid Target RD Programme Pictured above is a
test being conducted at RAL of the durability of
wire samples of target materials under thermal
shocks comparable to those in the real NF target,
which are induced by an intense pulsed current.
See also MICE poster
Residual proton Beam Dump
RF Phase Rotator
Tungsten target enclosed in 20T
solenoid (produces pions from protons)
Plan view of the new accelerators superimposed on
the RAL and Harwell site.
FFAG Electron Model of Muon Acceleration (EMMA)
Dogbone Recirculating Linac (RLA) 5½ pass, 2-13GeV
A new type of accelerator called a non-scaling
FFAG is used in the final muon acceleration
stages. The prototype EMMA is scheduled for
construction at Daresbury.
See also EMMA poster
Muon Decay Ring (muons decay to neutrinos)
Solenoidal Muon Linac 0.2-2GeV
Near Detector
R110
R109
FFAG 2 25-45GeV
FFAG 1 13-25GeV
To Far Detector 1
To Far Detector 2
300m below ground