Moving beyond Simon van der Meers paradigm Pion Instrumented Line PIL X X X Eliminate m storage capability 2 X 1300 km Residual high energy protons bend down 29 bend down ID: 919095
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Slide1
A neo-conventional neutrino beam
Moving beyond
Simon van der Meer’s
paradigm
Slide2Pion Instrumented Line (PIL)
X
X
X
Eliminate
m
storage capability
2
X
1300 km
Residual high energy protons
bend down
2.9
°
bend down
2.9
°
π
decay in the straight
Target Station
nuSTORM
Ao
Liu
Slide3n
flux:
nuSTORM pion line vs. dedicated pion line
Current LBNF baseline
3
FODO extension of nuSTORM
p
beamline: P0=7 GeV/c with larger acceptance
nuPIL
FODO
nuSTORM
Slide4Why is this interesting?
Beam systematics of concern for conventional horn-focused
n
beam line
Secondary particle productionParticle types, flux and energy distribution
Proton beam targeting stabilityTarget degradation/changeHorn stability+++?
All of these become unimportant since the pion flux is measured by the beam line instrumentation (flux, momentum distribution, emittance)R&D issue here – never been done
In addition – no (zero) n background in anti-n beam & vice versaSign selection
4
Slide5d
CP
coverage
5
GLoBES
analysis
Pilar Colomar
Slide6Increasing the flux
6
Jean-Baptist Lagrange
Imperial College London
Momentum acceptance ~ ± 50%
Target + Horn
Slide7n
flux from FFAG
7
GLoBES
analysis
to be done
VERY Preliminary
Slide8Integrated neutrino Target station
8
Slide9Conclusion
A pion beam line presents an interesting possibility for producing a
n
m
beam for long-baseline n
oscillation experimentsAnd, with an appropriate target station design, sets the stage for the next step(s)
9
Slide10Practical considerations
Case in point: LBNF
Primary proton beam line, target station and proton dump all at grade
No hill
Decay straight is no longer a “decay pipe”, but a beam line
Radiation safety considerations VERY different
High-power/high-energy beam does not go underground
~6-7 m concrete annulus is not required
Will have to be vetted by Rad Safety
Has significant cost impact
10