alain blondel detectors uno (400kton water cherenkov) liquid ar tpc (~100kton)
Post on 21-Dec-2015
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Alain Blondel
Detectors
UNO(400kton Water
Cherenkov)
Liquid Ar TPC(~100kton)
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Alain Blondel
Far detector in second phase
Phase-I: Super-K
22.5kt (50kt)
Phase-II: Hyper-K1,000 kt
Candidate site in Kamioka
Other major goal: improve proton decay reach
limit to the size of large underground Water Cherenkovdetectors will be given by the difficulties of excavation. Max width is about 50-60 meters.=> increase high&length
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Alain Blondel
SPL neutrino beam
* At 2 GeV, K production is very small Bkg of from e in the beam is small and dominatedby muon decay This can be tailored by varying the length of the decay tunnel and reduced to 0.3-0.4 % (all spectrum)
* this is a low energy beam ( <E> = 300 MeV )
e
Still work to do to fucus these…
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Alain Blondel
/e Background Rejection
e/mu separation directly related to granularity of coverage. Limit is around 10-3 (mu decay in flight) SKII coverage OKOK, less maybe possible
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Alain Blondel
reconstruction < 1GeV region
CC quasi elastic reaction
cos
22
pEm
mEmE
N
N
+ n → + p
-
p
(E, p)
+ n → + p +
-
p
(E, p)
Inelastic (BG)
CCqe
inelastic
~80MeV(10%)limited by Femi motion
Small BG5 X smallerfor SPL beam
SK FullDet. Sim.
Energy can be well reconstructed =>Bkg reductionprecise measurement of osc. params SENSITIVITY SIMILAR TO JHF-> HyperK
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Alain Blondel
BETA Beam
new idea by P. Zucchelli
produce 6He++, store, accelerate (100 GeV/u), store
Q=3.5078 MeV T/2 = 0.8067 s
pure anti-e beam at 600 MeV
or: eFNe e
189
1810 pure e beam at 600 MeV
oscillation signal: appearance of low energy muons no opposite charge neutrinos=> no need for magnetic detectorslittle matter effects at these energieswater Cerenkov excellent for this too, same as for Superbeam.seems feasible; but cost unknown so far. Critical: duty cycle. A nice *** idea to be followed up!
6He++ Li+++ e e
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Alain Blondel
Anti-Neutrino Source
Consider 6He++6Li+++ e e-
E03.5078 MeV T/2 0.8067 s
1. The ion is spinless, and therefore decays at rest are isotropic.
2. It can be produced at high rates, I.e.5E13 6He/s
3. The neutrino spectrum is known on the basis of the electron spectrum.
DATA and theory:<Ekine>=1.578 MeV<E>=1.937 MeVRMS/<E>=37%
B.M. Rustand and S.L. Ruby, Phys.Rev. 97 (1955) 991B.W. Ridley Nucl.Phys. 25 (1961) 483
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Alain Blondel
Neutrino Source
Possible neutrino emitter candidate:18Ne
The same technology used in the production of 6He is limitedin the 18Ne case to 1012 ions/s.Dedicated R&D should increase this figure. Use this intensity as reference.
Issues: MgO less refractory,heat dissipation
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Alain Blondel
Beta Beam (P. Zucchelli)
PS
SPS
Decay
RingISOL
target
SPL
ACCUMULATORPSPS
SPS
Decay
RingISOL
target
SPL
ACCUMULATOR
M. Lindroos et al.
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Alain Blondel
Combination of beta beam with low energy super beamUnique to CERN:
need few 100 GeV accelerator (PS + SPS will do!)experience in radioactive beams at ISOLDE
many unknowns: what is the duty factor that can be achieved? (needs < 10 -
3 )
combines CP and T violation tests
e (+) (T) e (+)
(CP)
e (-) (T) e (-)
Can this work???? theoretical studies now on beta beam + SPL target and horn R&D design study together with EURISOL
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Alain Blondel
Superbeam & Beta Beam cost estimates
Educated guess on possible costs USD/CHF 1.60UNO 960 MCHFSUPERBEAM LINE 100 MCHFSPL 300 MCHFPS UPGR. 100 MCHFSOURCE (EURISOL), STORAGE RING 100 MCHFSPS 5 MCHFDECAY RING CIVIL ENG. 400 MCHFDECAY RING OPTICS 100 MCHF
TOTAL (MCHF) 2065 MCHFTOTAL (MUSD) 1291 MUSD
INCREMENTAL COST (MCHF) 705 MCHFINCREMENTAL COST (MUSD) 441 MUSD