E.A.Kravchenko on behalf Novosibirsk group FARICH for Forward PID E.A.Kravchenko on behalf Novosibirsk group

Outline Multi layer aerogel production and characterization FARICH optimization Status of work on test beam at Budker INP

Multilayer aerogel 100x100x41 mm, Lsc = 45 mm at 400 nm

Xray measurement, density distribution The increase in density at the internal borders is the result of the production procedure (diffusion). Does it effect the performance? Layer <n> n, (optimal) n, (design) h, mm h, mm (design) 1 1.046 1.050 12.6 12.5 2 1.041 1.040 1.044 13.2 13.3 3 1.037 1.035 1.039 15.2 14.2

Monte Carlo simulation of longitudinal refractive index fluctuations 200 mm expansion gap 3 types of radiators 3layer as designed (ideal) Xray data avereged to 3 layers Xray data avereged to 14 layers

Simulation results, π/K separation Npe =14 σβ = 5∙10-4 ‘optimal’ radiator → best resolution for 4 GeV/c pions ‘real’ experimental radiator → best resolution for 3.5 GeV/c kaons π/K separation up to 8 GeV/c (>3σ)

Layout of the FARICH in the SuperB detector-1

Layout of the FARICH in the SuperB detector-2

Proximity focusing RICH

4-layer focusing (MLA-4) Pixel size effect Single photon resolution with zero pixel size: MLA-4: σr,1ph = 1.1 mm Resolution degradation, % pixel size, mm Nanodes number of channels 10 1.8 28x28 329280 20 2.5 20x20 168000 50 4.3 12x12 60480

Number of photoelectrons Velocity resolution

Particle separation

FARICH momentum resolution σP/P=γ2∙σβ/β

Status of test beam project at Novosibirsk Work on MC simulation has started. But we are still at the very beginning. The project was discussed with VEPP-4M team and INP vice-director. It was suggested to use moving wire target to produce bremstrahlung gammas. The place was found. The design of this system has started. It will be mounted during KEDR detector stop for the repair.

Comparison of endcap FARICH and KEDR DC momentum resolution at 30° entrance angle

Velocity resolution with ‘ideal’ photon coordinate resolution

Particle separation with ‘ideal’ photon coordinate resolution

Single photon resolution with zero pixel size: RICH with NaF radiator Single photon resolution with zero pixel size: NaF 14 mm thickness: σr,1ph = 14 mm Resolution degradation, % pixel size, mm Nanodes number of channels 10 25 2x2 1680

Number of photoelectrons with NaF radiator

Velocity resolution with NaF radiator

Particle separation with NaF radiator

RICH momentum resolution with NaF radiator

Forward FARICH and DIRC comparison