Author/Authors :
Cisbani، نويسنده , , E. and Colilli، نويسنده , , S. and Crateri، نويسنده , , R. and Cusanno، نويسنده , , F. and Fratoni، نويسنده , , R. and Frullani، نويسنده , , S. and Garibaldi، نويسنده , , F. and Giuliani، نويسنده , , F. and Gricia، نويسنده , , M. and Iodice، نويسنده , , M. and Iommi، نويسنده , , R. and Lucentini، نويسنده , , M. and Mostarda، نويسنده , , A. and Pierangeli، نويسنده , , L. and Santavenere، نويسنده , , F. and Urciuoli، نويسنده , , G.M. and De Leo، نويسنده , , R. and Lagamba، نويسنده , , L. and Nappi، نويسنده , , E. and Braem، نويسنده , , A. and Vernin، نويسنده , , P.، نويسنده ,
Abstract :
Light-weight spherical mirrors have been appositely designed and built for the gas threshold Cherenkov detectors of the two Hall A spectrometers. The mirrors are made of a 1 mm thick aluminized plexiglass sheet, reinforced by a rigid backing consisting of a phenolic honeycomb sandwiched between two carbon fiber mats epoxy glued. The produced mirrors have a thickness equivalent to 0.55% of radiation length, and an optical slope error of about 5.5 mrad. These characteristics make these mirrors suitable for the implementation in Cherenkov threshold detectors. Ways to improve the mirror features are also discussed in view of their possible employment in RICH detectors.
