Near Detector Flux and R&DNear Detector Flux and R&D Near Detector Flux and R&DNear Detector Flux and R&D
International Scoping Study Meeting
27 April 2005Paul Soler
University of Glasgow
3rd International Scoping Study Meeting Rutherford Appleton Laboratory
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e
e
e
e
Neutrino Factory Beams Neutrino Factory Beams Neutrino beams from decay of muons:
Spectra at Production(e.g. for 50 GeV muons)
Number CC interactions
Polarisation dependence
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Near detectors should be able to measure flux and energy of and Calibration and flux control (see Blondel talk): Event rates at near detector (McFarland) leading to far detector rates:
Try and develop beam simulations to reproduce these results
e
Near detector beam fluxNear detector beam flux
ee
E.g. at 25 GeV, number neutrino interactions per year:
20 x 106 in 100 g per cm2 area.
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Near detector(s) are some distance (d~30-1000 m) from the end of straight section of the muon storage ring.
Muons decay at different points of straight section: near detector is sampling a different distribution of neutrinos to what is being seen by the far detector
Near detector beam fluxNear detector beam flux
storage ring
shielding
the leptonic detector
the charm and DIS detector
Polarimeter
Cherenkovd
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Different far detector baselines:*̶ 730 km, 20 m detector: ~30 rad*̶ 2500 km, 20 m detector: ~8 rad*̶ 7500 km: 20 m detector: ~3 rad
If decay straight is L=100m and d =100 m, neutrinos are generated between 30-130 m from detector. E.g. at 8 rad, lateral displacement of neutrinos is 0.25-1.0mm to subtend same angle.
Near detector beam fluxNear detector beam flux
storage ring
shielding
the leptonic detector
the charm and DIS detector
Polarimeter
Cherenkov d
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I have inherited some neutrino factory beam, event generator and detector code from A. Cervera and JJ Gomez (Thank you!)
It needs o be adapted to generate events at a near detector At the moment events are generated from a point neutrino source. Need to implement decays along straight decay sections Only looked at fluxes and number of events expected in detectors Can observe energy shift as a function of distance
Near detector beam fluxNear detector beam flux
storage ring
shielding
the leptonic detector
the charm and DIS detector
Polarimeter
Cherenkov d
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Near detector beam fluxNear detector beam fluxd=30 m, r=0.5 m
Fluxd=130 m, r=0.5 m d=1km, r=0.5 m
e
Anti
17.8 GeV
15.3 GeV
21.6 GeV34.1 GeV
29.2 GeV18.5GeV
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Near detector event ratesNear detector event ratesd=30 m, r=0.5 m
Event ratesd=130 m, r=0.5 m d=1km, r=0.5 m
Anti
e
25.5 GeV
22.3 GeV
26.6 GeV 37.1 GeV
32.5 GeV
23.2 GeV
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Far detector flux and event ratesFar detector flux and event ratesd=2500 km, r=20 m
Event rates
Anti
e
35.8 GeV
30.0 GeV
38.1 GeV
33.3 GeV
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Far detector flux and event ratesFar detector flux and event ratesSofia group are implementinmg full decay along straight sections (500 m)
with Polarities +1: Roumen Tsenov, Yordan Karadzhov
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Far detector flux and event ratesFar detector flux and event ratesSofia group are implementinmg full decay along straight sections (500 m)
with Polarities -1: Roumen Tsenov, Yordan Karadzhov
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Far detector flux and event ratesFar detector flux and event ratesSofia group are implementinmg full decay along straight sections (500 m)
with Polarities +-1: Roumen Tsenov, Yordan Karadzhov
3rd International Scoping Study Meeting Rutherford Appleton Laboratory
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Far detector flux and event ratesFar detector flux and event ratesSofia group are implementinmg full decay along straight sections (500 m)
with Polarities +-1: Roumen Tsenov, Yordan Karadzhov
3rd International Scoping Study Meeting Rutherford Appleton Laboratory
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PlansPlans We are now getting the beam simulations in place. Need to
implement proper decays along straight sections
Need to implement detectors into the beam simulations, and interface to neutrino generators (Genie, home grown?)
Already beam simulations show that you need good granularity in near detector to be able to obtain fluxes that are relevant for far detector and to minimise systematics (plot in radial bins).
Good granularity would imply something like a silicon pixel/strip detector or emulsion to achieve good vertexing and accurate divergence (can emulsion handle the rate??)
DEPFET, Monolithic Active Pixels, Hybrid pixel detectors could do job: detector R&D …..
Need more manpower