A dual-radiator RICH detector has been installed in 1998. The Frascati group has contributed to the project, construction and installation of the photon detector of the RICH with the responsability of the magnetic stay field studies on the photomultipliers.

The results on the magnetic field studies are reported in the following notes:

Preliminary tests of the magnetic field effects on photomultipliers for the HERMES RICH detector
N. Bianchi, V. Muccifora - May 97 (ps file)

Magnetic field studies on the selected PMT Philips XP1911
N. Bianchi, E. De Sanctis, V. Muccifora, E. Thomas - November 97 (ps file)

Magnetic field shielding provided by the Argonne honeycomb prototype
G.P. Capitani, V. Muccifora, E. Thomas - January 98 (ps file)

Magnetic field effect at low HV
V. Muccifora, E. Thomas - February 98 (ps file)

The characteristics of the RICH are reported in the following papers:

Optical characterization of n=1.03 silica aerogel used as radiator in the RICH at HERMES
E. Aschenauer et al. NIM .... 99 (ps file)

For more informations, see the RICH HOME PAGE