Design and Performance of a Monolithic Plastic Scintillator Tracker with Embedded Scatterers

Abstract

We propose a new scintillator-based tracker concept based on a monolithic plastic scintillator plate with embedded scatterers and wavelength-shifting fiber readout. The embedded scatterers localize scintillation light so that channels closer to the charged-particle crossing point collect more light. The particle crossing position is reconstructed from the channel-to-channel light yield distribution with a position resolution well below the readout pitch. We performed a positron beam test with prototypes to validate the reconstruction principle and to evaluate the detection efficiency and position resolution. The beam test validated the position reconstruction principle, and demonstrated a near-100% detection efficiency and a position resolution of 1.47 mm for normal incidence and 1.85 mm for an incidence angle of 45°, with the 10-mm readout pitch. In this paper, we describe the detector concept, the reconstruction method, and the results of the beam test.

Figures (18)

• Figure 1: Schematic of a conventional segmented scintillator tracker. The fired scintillator segment is shown in red.
• Figure 2: Conceptual design of FROST.
• Figure 3: Mechanism of position reconstruction in FROST.
• Figure 4: Event-averaged light yield distributions in the $x$ fiber array for normally incident 1-GeV muons injected at $(x,y)=(1~\mathrm{mm},0~\mathrm{mm})$, shown for $\lambda_{\mathrm{scat}}=1.0~\mathrm{mm}$, $10.0~\mathrm{mm}$, and $50.0~\mathrm{mm}$.
• Figure 5: Example of the light yield distribution obtained in the beam test.