Une petite lettre à Père Noël….

A. Blondel, G. Prior, S. Borghi,R.Sandström,E.Gschwendtner, A. Cervera, P. Bene, J.-P. Richeux,S. Gilardoni

Harp

TPC: Silvia, Gersende

NDC: Anselmo

Il y a un an:

la TPC,cette inconnue

Avec l’aide de beaucoup de monde

… et du travaille

Aujourd’hui

Et pour Noël de cett’ année

Comparison of pt/pt(Preliminary)HARP TPC dE/dx

(Preliminary)

Protons

Muonsand pions

Electrons?

Relativistic rise

)β(A

21

Mice @ RAL:Proposal approuvé

The review committee...

• Light in the longitudinal direction– As little as possible material in

the beam– Light and uniform material for

the readout amplification and readout planes

– Electronics and connections out of the beam region

• Capable to stand high particle flux• In an a harsh environment due to

X-ray background from RF cavity dark currents (large amount of spurious hits)

• TPC: 1m long, 30cm diameter of the active area (40cm diameter field-cage)

• Gas choice– To minimize the material in the

beam and to keep the X-ray conversions to the minimum, a He-based mix is preferred. (He/CH4, He/CO2)

• Amplification– By a 3-GEM structure. Large

gains are needed if one wants to use a He-based mix

• Readout– In 3 projections, over about 710K

hexagonal pads in a 30cm diameter disk

MICE TPG ParamètresDétecteur des traces pour MICE

Le project TPG pour MICE: Edda, Rikard, Jean-Pierre, Pierre

Harp Mice GEM Hexaboard

300µm padstotal: 710000 pads

2mm gap

30cm diameter

60µm

e

COMPLETE DETECTOR TESTS NOW!

Simulation de la TPG et G4MICE

• Simulation du détecteur Modélisation du bruit du fond du au RF

tout ça en Geant4

Experience K2K: les premieres shifts(Anselmo, Silvia, Alain)

K2K and HARP• First long baseline (250km)

neutrino experiment• To investigate neutrino oscillation

observed in atmospheric neutrinos by Super-Kamiokande

250 km

250 km

12 GeV-PS@KEK12 GeV-PS@KEKNeutrino BeamNeutrino BeamBeam MonitorsBeam MonitorsFront DetectorsFront Detectors

<E<E> = 1.3 GeV> = 1.3 GeV almost pure almost pure : ~98%: ~98%

Super-KamiokandeSuper-Kamiokande 50 kton water 50 kton water cherenkov detectorcherenkov detector

Beam MC Beam MCconfirmed byPion Monitor

0.5 1.0 1.5 2.0 2.50 E(GeV))

oscillation peakfa

r/ne

ar

• First HARP analysis already in progress:

To be measured by HARP

Estimate neutrino fluxes for K2K and MiniBooNE experiments

(K2K example)

K2K analysisin HARP

oscillation peak

Neutrino spectrum in K2K near detector

GeVE 75.05.0

mrad

GeVP

250

1

K2KK2K

interestinterest

(P, ) of pions producingneutrinos in the osc. peak

P > 1 GeV

mradsx ]250 ,250[

K2Kinterest

K2Kinterest

Geometrical Acceptance of HARP (forward)

Corne Nufact

•Test mécaniques terminesNouvelle alimentation ( 100 kA, 100 s, 0.5 Hz)Preparation du voyage pour Paris

Au revoir auprochaine année

avec des autresbonnes nouvelles

Buon Natale