Bent silicon crystals have been recently installed in the SPS ring in the frame of the UA9 experiment, which is attempting the collimation of the SPS circulating beam by means of bent silicon crystals. We discuss their fabrication technique based on non-conventional use of established techniques of anisotropic etching of silicon in micro-machining. Morphological and structural analyses were carried out through electron and scanning-probe microscopy to show that the crystal exhibited flat surfaces with atomically sharp termination. Prior to installation in the SPS ring, crystals were tested by the UA9 collaboration on H8 SPS extracted beam with 400GeV protons in channeling and volume reflection experiments. The crystal holder is designed to bend the crystal and to compensate for torsional effects.
FABRICATION OF SILICON STRIP CRYSTALS FOR UA9 EXPERIMENT
BAGLI, Enrico;BARICORDI, Stefano;DALPIAZ, Pietro;GUIDI, Vincenzo;MAZZOLARI, Andrea;VINCENZI, Donato
2010
Abstract
Bent silicon crystals have been recently installed in the SPS ring in the frame of the UA9 experiment, which is attempting the collimation of the SPS circulating beam by means of bent silicon crystals. We discuss their fabrication technique based on non-conventional use of established techniques of anisotropic etching of silicon in micro-machining. Morphological and structural analyses were carried out through electron and scanning-probe microscopy to show that the crystal exhibited flat surfaces with atomically sharp termination. Prior to installation in the SPS ring, crystals were tested by the UA9 collaboration on H8 SPS extracted beam with 400GeV protons in channeling and volume reflection experiments. The crystal holder is designed to bend the crystal and to compensate for torsional effects.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
