Zone d'identification
Cote
Titre
Date(s)
Niveau de description
Étendue matérielle et support
Object
Zone du contexte
Histoire archivistique
Source immédiate d'acquisition ou de transfert
Zone du contenu et de la structure
Portée et contenu
Each of these straws is a complete mini–detector in its own right. Every one is filled with a gas mixture and threaded with a wire. Imagine assembling 300’000 fragile drinking straws up to 144 cm long, with no bends or kinks allowed! This layer of tracker plays two important roles. Firstly, it makes more position measurements, giving more dots for the computers to join up to recreate the particle tracks. Then it also helps distinguish between different types of particles depending on whether they emit radiation as they make the transition from the surrounding foil into the straws. An electric field is applied between the wire and the outside wall of the straw. As particles pass through, they collide with atoms in the gas, knocking out electrons. The avalanche of electrons is detected as an electrical signal on the wire in the centre.
Évaluation, élimination et calendrier de conservation
Accroissements
Mode de classement
Zone des conditions d'accès et d'utilisation
Conditions d'accès
Public
Conditions de reproduction
Langue des documents
Écriture des documents
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Caractéristiques matérielle et contraintes techniques
- 5 cm for each side 214 cm 7.5 cm Doesn't include support. Approx. 120 kg with both wheel and chassis
Instruments de recherche
Zone des sources complémentaires
Existence et lieu de conservation des originaux
On loan, Microcosm.