We present an algorithm to fit 3D straight tracks in a set-up of pixel/strip detectors in zero or negligible magnetic field. The fitting method is iterative and it allows for the arbitrary orientation of detectors. The fit algorithm is used for detector position calibration and track reconstruction in the Helsinki Silicon Beam Telescope.

Calibration of three scintillators (EJ232Q, BC422Q, and EJ410) in a time-of-flight arrangement using a laser drive-neutron source is presented. The three plastic scintillator detectors were calibrated with gamma insensitive bubble detector spectrometers, which were absolutely calibrated over a wide range of neutron energies ranging from sub-MeV to 20 MeV. A typical set of data obtained simultan...

ACORDE is one of the ALICE detectors, presently under construction at CERN. It consists of an array of plastic scintillator counters placed on the three upper faces of the ALICE magnet. It will act as a cosmic ray trigger, and, together with other ALICE sub-detectors, will provide precise information on cosmic rays with primary energies around 10 ÷ 10 eV. Here we describe the design of ACORDE a...

We present studies on electron backscattering from the surface of plastic scintillator beta detectors. By using a setup of two detectors coaxial with a strong external magnetic field – one detector serving as primary detector, the other as veto-detector to detect backscattering – we investigate amount and spectrum of unrecognized backscattering, i.e. events where only one detector recorded a tr...

The potential of the high resolution nuclear track detector (NTD) CR-39 is examined carefully for the measurement of relativistic nuclear projectile fragmentation cross sections and studies of related processes using the experience of many years of such measurements. The charge resolution and the charge resolving power of CR-39 detectors for the measurements of 158 A GeV Pb projectiles and thei...

We present the development and characterization of thin tile scintillator detectors with silicon photomultiplier (SiPM) readout for use in a multi-layer fast-neutron tracker. The tracker is based on interleaved Timepix and plastic scintillator layers [1]. Fast-neutrons recoil protons in the plastic scintillators, which may then travel to and stop in the neighboring Timepix. Using the measured r...