Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 108: Combined instrumentation session II: Silicon strip detectors (joint session HK/T)

T 108.7: Vortrag

Freitag, 3. April 2020, 12:30–12:45, H-HS XIII

Studying magnet-induced wire-bond oscillations for the ATLAS ITk Strip Detector — •Ben Brüers¹, Ruchi Gupta¹, Ksenia Solovieva², Dennis Sperlich³, and Edoardo Rossi¹ — ¹DESY — ²Imperial College London — ³Albert-Ludwigs-Universität Freiburg

For the high luminosity phase of the LHC, the ATLAS collaboration plans to upgrade its current tracking detector with a new, all silicon Pixel and Strip Detector, referred to as Inner Tracker (ITk). The ITk Strip Detector modules will contain printed circuit flex boards carrying the read-out and powering chips. All chips will be connected to the printed circuit flex boards using 25 µm thick aluminium wire-bonds. Several of these wire-bonds will carry alternating currents. In the 2 T solenoid magnetic field of ATLAS surrounding the ITk, these wire-bonds can start oscillating. Damage by oscillations have been observed e.g. at the CDF detector, when the trigger frequency (and with that the alternating current frequency) accidentally aligned with the resonance frequency of the wire-bonds. To study the potential danger of resonant wire-bond oscillations for the ITk Strip Detector, a prototype module was exposed to a 1 T magnetic field and triggered at multiple frequencies between 0.1 kHz and 350 kHz. To observe oscillations, an innovative observation setup was employed and several hours of video material collected. While the module was not damaged, the search for wire-bond oscillations in the video material is on-going. This talk will introduce the procedure and show the latest results on assessing the resonant frequencies and sensitivities of the ITk Strip Detector wire-bonds to magnet-induced oscillations.