Downstream e-  identification 1. Questions raised by the Committee 2. Particle tracking in stray magnetic field 3. Cerenkov and calorimeter sizes 4. Preliminary.

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Presentation transcript:

Downstream e-  identification 1. Questions raised by the Committee 2. Particle tracking in stray magnetic field 3. Cerenkov and calorimeter sizes 4. Preliminary conclusions Gh. Grégoire CERN March 2003 Progress towards answers to the International Peer Review Panel 5. Questions MICE Collaboration Meeting

Questions raised 1. Homogeneity of response of the particle ID devices downstream ? 2. Risk of bias through loss of muons by unwanted rejection? - position - incident angle - energy dependence of over-vetoing electrons Cerenkov and calorimeter !

First elements For the Cerenkov Possible origins of inhomogeneity of response - too few generated photons at some places - non uniform light acceptance/collection across the system Precautions - radiator area is large enough - highly reflective walls and surfaces - number of reflections kept to a minimum Remark These precautions were already taken into account in the conceptual design presented in the proposal … but a second iteration is needed ! What are the sizes and relative positions of the Cerenkov and the calorimeter ?

Input data a) Sampleelectrons muons (from P. Janot) from the simulation of a cooling channel Starting points Relative populations of electrons vs muons are not normalized ! Previous presentations b) Latest(?) magnetic field configuration from R. Palmer (version 5) c) proposal

V.5 Magnetic field configuration r z O

Downstream ID detectors … according to proposal ! Transverse size of Cerenkov must match the distribution of muons which reach the calorimeter

Particle tracking - Generation of field map downstream the solenoid - GEANT 4 tracking of Janot’s muon and electron files - Results Electron and muon distributions (positions, momentum components) for 0 < z < 1000 mm 0 < r < 500 mm (-500 < x, y < 500 mm) from geometry and current densities (TOF2 not yet taken into account)

Trajectories r z r z 1000 mm ElectronsMuons

Transverse distributions

Acceptance for muons 700 mm 400 mm Calorimeter Cerenkov at z = 100 mm at z  800 mm

Preliminary conclusions (1) - Smaller Cerenkov and calorimeter compared to proposal - Updated mechanical and optical designs to come (soon?) - No large improvement expected on homogeneity of response  = 77%Thresh = 5 .e. Fluctuations are largely dominated by statistics Cost … but magnetic shielding not taken into account ! Optical response

Preliminary conclusions (2) Correlation with the calorimeter ? With n=1.02, [ % HE muons generating > 5 .e. ] = 0.2 E thr = 530 MeV Unambiguously identified in calo ! … except if  decays inside Cerenkov Proba ~1.5 x (over 0.5 m at 530 MeV) Fraction [ good  ] veto  3 x 10 -7

Questions for further work 1. Confirmation of Geant 4 tracking Who? When? 2. Magnetic shielding Rough estimate ~15 cm iron ! Influence on field and on tracking near end of solenoid ?