The ALEPH experiment  at LEP is equipped with a vertex detector  using two layers of double-sided silicon strip detectors. These detectors allow a real two-dimensional measurement of charged particle tracks. The present (1991) detector has the inner layer at a radius of 6.5 cm and the outer layer at 11.5 cm. The theta angle coverage is +/- 33-degrees for the inner layer and +/- 50-degrees for the outer layer. The inner layer is made out of 9 faces with four silicon detectors each, the outer layer has 15 such faces. We use silicon detectors of 5 x 5 cm2 and 300-mu-m thickness. The readout pitch is 100-mu-m at both sides and using capacitive charge division a resolution in the order of 10-mu-m can be achieved. The signals from 256 readout strips are integrated, amplified and multiplexed using four CAMEX64 chips. An early version of this detector was already installed in spring 1990. Although the detector was not complete and in addition was accidentally damaged by malfunctions of the external electronics, it took data during the 1990 ALEPH run. For the first time double sided silicon detectors were used in a physics experiment. In 1991 the beampipe was replaced by a smaller one. This allowed us to move the inner layer to a radius of 6.5 cm. A completely new detector has been built. This new detector has been installed in spring 1991. Most of the results quoted in this paper refer to this detector.
|Autori:||BATIGNANI G; BAUER C; BECKER H; BOUDREAU J; BROWN D; BOSI F; BOSISIO L; CARPINELLI M; CARR J; COYLE P; DELLORSO R; DIETL H; DRINKARD J; FOCARDI E; FORTI F; GIORGI M; HANSLKOZANECKI T; HAUFF D; HOLL P; LANCON E; LAUBER J; LITKE A; LUTZ G; LUTJENS G; MANNELLI E; MANNER W; MENARY S; MONETA L; MOSER HG; MOURS B; PARRINI G; PICCININI S; REDLINGER G; RIZZI D; RIZZO G; ROUSSEAU D; TONELLI G; TRIGGIANI G; SCHWARZ AS; SCHWEMLING P; SETTLES R; SEYWERD H; STRUDER L; VANNINI C; VERDINI PG; WALTERMANN G; WALTHER S; WEAR J; WEBER F|
|Titolo:||EXPERIENCE WITH THE ALEPH SILICON VERTEX DETECTOR|
|Anno del prodotto:||1992|
|Digital Object Identifier (DOI):||10.1016/0168-9002(92)90691-V|
|Appare nelle tipologie:||1.1 Articolo in rivista|