Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 11: Gaseous Detectors I

T 11.2: Vortrag

Montag, 16. März 2026, 16:30–16:45, KH 01.014

Spatial Resolution of the SHiP Decay Spectrometer Straw Tracker with SAMPIC Read-Out — •Wei-Chieh Lee, Caren Hagner, Daniel Bick, and Walter Schmidt-Parzefall — Institute of Experimental Physics, University of Hamburg, Hamburg, Germany

SHiP (Search for Hidden Particles) is a general-purpose beam-dump experiment currently in preparation at CERN SPS. The experiment is designed to look for feebly interacting particles (FIPs) predicted by several theoretical models of the hidden sector. From dumping the high-intensity proton beam from the SPS onto a target, hidden particles would be potentially produced and fly towards a 50 m long decay volume, where they decay into SM particles to be detected. The Decay Spectrometer Straw Tracker (DSST) downstream, consisting of about 10,000 straw tubes of 4 m length and 2 cm diameter, plays the role of tracking the charged decay products and measuring their momentum for the reconstruction of the decay vertex and mass of the hidden particles. A high spatial resolution of the DSST is essential and requires a precise drift time measurement. To achieve this, the use of a waveform time-to-digital converter (WTDC) for read-out, such as SAMPIC with its high timing precision and capability to sample the leading edge of a signal, is currently under investigation.

For testing, a small DSST prototype was taken to DESY and CERN PS for test beams. The results will be presented in this talk. Furthermore, a plan to test a full-scale prototype of 4 m long straw tubes will be discussed.

Keywords: SHiP; straw tracker; SAMPIC; test beam; detector R&D