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RIKEN Accel. Próg. Rep. 24 (1990)

111-5-19. Responses of Large Position-Sensitive Detectors

to Heavy lon Beams

C. Kato, T. Imai, A. Yoneda, H. Kato, K. Munakata, and T. Kohno

Position sensitive detectors (PSD) play an impor-tant role in the high-resolution observation of cos-mic-ray heavy ions in space. We are preparing a cosmic-ray heavy ion telescope having a very large geometric-factor. The telescope will be put into a geosynchronous orbit on board the Engineering Test Satellite (ETS-VI) in 1993.^1} The objectives of our observation are elemental and isotopic abun-dance of galactic cosmic rays (GCR) and solar energetic particles (SEP) up to Fe nuclides. The position information entering the telescope is used to detemine the pathlength in a AE detector, which is very important value in a AE x E method for particie identification.

The two-dimentional charge division type PSD has an effective area of 62 mm x 62 mm. Although some performances of the PSD for Iow energy

heavy ions (stopping in the detector) from 160 cm

Fig. 2. Błock diagram of the telescope system of the flight model. The micro processor part was simulated with a personal Computer.