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  • Commissioning of the DELPHI...
    Becks, K.H; Brunet, J.M; Caccia, M; Clemens, J.C; Cohen-Solal, M; Courty, B; de Boer, W; Delpierre, P; Demaria, N; Drees, J; Elsing, M; Gerlach, P; Glitza, K.W; Gregor, I.M; Guglielmi, G; Hartmann, F; Heising, S; Heuser, J.M; Jaeger, J.J; Kaiser, M; Kersten, S; Knoblauch, D; Leb, H; Ledroit, F; Maehlum, G; Meroni, C; Mönig, K; Mouthuy, T; Raymond, M; Roos, L; Sauvage, D; Troncon, C; Tristram, G; Turlot, J.P; Überschär, B; Vegni, G; Wielers, M

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998, Letnik: 418, Številka: 1
    Journal Article, Conference Proceeding

    The DELPHI Vertex Detector has been upgraded for LEP200 with 2 layers of pixel detectors and 2 layers of ministrips as endcaps, thus covering the polar angular range between 10° and 21° and allowing for standalone pattern recognition. During the 1995/96 shutdown the first 95 modules were installed and the installation was completed in May 97 with all 152 modules. Production yields and failures during the assembly will be presented. The detector operated at a threshold of around 9000 electrons resulting in a number of noisy pixels at the 10 −3 level. After masking these hot pixels in the readout, the remaining number of random hits per event is at the 10 −6 level. The observed resolution of about 100 μm is close to the expectation for binary readout. The track reconstruction efficiency increased by more than 100% in the central part of the forward tracker.