BEXCO - Room F(201/202/203/204)
[CRD016] Status of the Top and Bottom Counting Detectors for the ISS-CREAM Experiment
The Cosmic Ray Energetics And Mass experiment for the International Space Station, ISS-CREAM, aims to study the origin, acceleration and propagation mechanism of high-energy cosmic rays. The ISS-CREAM payload is scheduled to be launched in 2017 to the ISS. The Top Counting Detector (TCD) and Bottom Counting Detector (BCD) are constructed for electron/gamma-ray physics. The TCD/BCD distinguish electrons from protons using differences in shape between electromagnetic and hadronic showers in the energy range of 300 GeV ~ 800 GeV. In addition, the TCD/BCD provide a redundant trigger to that from the calorimeter and a low energy trigger to the ISS-CREAM instrument. For these purposes, the TCD/BCD are designed as 2-dimensional detectors, which consist of a plastic scintillator attached to 20 x 20 photodiodes. The active area of each photodiode is 20 mm × 20 mm. The sizes of the plastic scintillators are 500 mm × 500 mm × 5 mm and 600 mm × 600 mm × 10 mm, respectively. The total masses of the TCD/BCD are 9.6 kg and 15.6 kg, respectively. The ISS-CREAM experiment has many critical requirements for space launch qualification. Thus the mechanical safety and performance in response to vibration and thermal vacuum tests has been studied under various conditions prior to launch. The e/p separation capability of the TCD/BCD has also been studied by using a GEANT3 simulation. In this presentation, we report the status of the TCD/BCD including their design, construction, performance and simulation results.