near detector flux and r&d near detector flux and r&d international scoping study meeting 27...

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

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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

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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


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.


storage ring

shielding



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


storage ring

shielding



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

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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

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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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with Polarities -1: Roumen Tsenov, Yordan Karadzhov


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with Polarities +-1: Roumen Tsenov, Yordan Karadzhov


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with Polarities +-1: Roumen Tsenov, Yordan Karadzhov


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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

near detector flux and r&d near detector flux and r&d international scoping study meeting 27...

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