Title of article :
A new carbon based VUV mirror of high radiation length for the HADES RICH
Author/Authors :
Friese، نويسنده , , J. and Gernhنuser، نويسنده , , R. and Maier-Komor، نويسنده , , P. and Winkler، نويسنده , , S.، نويسنده ,
Abstract :
We report on the development and production of a spherical (f=0.436 m) VUV mirror for the HADES RICH detector. Glassy carbon substrates of X0=28 cm radiation length were fabricated with a thickness of d=2 mm and an overall slope error SSE80⩽0.85 mrad. After coating with thin Al/MgF2 layers, the measured reflectivities in the wavelength region 120 nm<λ<240 nm yielded R=82% at λ=150 nm.
Keywords :
VUV mirror , HADES , VUV reflectivity , glassy carbon , rich
Journal title :
Astroparticle Physics
