Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Methods in astroparticle physics 3

T 56.8: Talk

Wednesday, March 6, 2024, 17:45–18:00, Geb. 20.30: 2.067

Time Resolution of the AMS-100 Time-of-Flight Detector at Cryogenic Temperatures — •Jule Deiters, Chanhoon Chung, Waclaw Karpinski, Thomas Kirn, Daniel Louis, Stefan Schael, and Michael Wlochal — I. Physikalisches Institut B, RWTH Aachen University

The next generation magnetic spectrometer in space, AMS-100, is designed with a geometrical acceptance of 100 m²sr for a ten year operation at Sun-Earth Lagrange Point 2. The purpose of AMS-100 is to improve the sensitivity for the observation of new phenomena in cosmic rays by at least a factor of 1000 compared to AMS-02.

The AMS-100 detector consists of a high temperature superconducting solenoid, an electromagnetic calorimeter, a tracking system made out of silicon and scintillating fibre modules, and a Time-of-Flight (ToF) system based on fast plastic scintillators read out by silicon photomultipliers (SiPMs).

The ToF system at Lagrange Point 2 will be operated at temperatures between 50 K and 200 K, so the detectors and scintillators need to be tested at cryogenic temperatures.

At room temperature, ToF-prototypes with (6 x 25 x 90) mm³ EJ-228 scintillators from Eljen Technology read out by either Hamamatsu S14161-6050HS or Broadcom AFBR-S4N66C013 SiPMs yield time resolutions of (38.45 ± 0.19) ps and (42.88 ± 0.98) ps, respectively.

Time resolution measurements with the ToF-prototypes in the temperature range of 243 K to 77 K will be discussed.

Keywords: scintillator; cryogenic temperatures; silicon photomultiplier; AMS-100; time of flight