The design overview and current development status of the Infrared Camera (IRC) onboard the Japanese infrared space mission, ASTRO-F (commonly called as the Infrared Imaging Surveyor, IRIS), are presented. The IRC is one of the focal plane instruments of ASTRO-F and will make imaging and low- resolution spectroscopy observations in the wide spectral range of the near- to mid-infrared of 2 - 26 micrometers . ASTRO-F will be brought into an IRAS-type sun-synchronous polar orbit. The IRC will be operated in the pointing mode, in which the telescope will be pointed at a fixed target position on the sky for about 10 minutes. The pointed observation may be scheduled up to three times per orbit. The IRC has three channels: NIR (2 - 5 micrometers ), MIR-S (5 - 12 micrometers ) and MIR-L (12 - 26 micrometers ). All of the three channels use refractive optics. Each channel has a field-of-view of 10' X 10' with nearly diffraction-limited spatial resolution. The NIR and MIR-S channels simultaneously observe the same field on the sky, while the MIR-L observes the sky about 20' away from the NIR/MIR-S position. State- of-the-art large format array detectors manufactured by Raytheon/IRCoE are employed for the IRC. The NIR channel uses a 512 X 412 InSb array, and 256 X 256 Si:As IBC arrays are used for the MIR channels. Fabrication of the proto-model has been completed and the preliminary performance test is under way.
Hideyuki Sakai, T. Wakasa, H. Otsu, Saneyuki Fujita, T. Nonaka, Haruo Okamura, T. Uesaka, T. Ohnishi, K. Hatanaka, M. Greenfield, S. Ishida, N. Sakamoto
We have designed and constructed a high-performance neutron polarimeter for measurements at intermediate energies, Ep equals 200-400 MeV. The current version of the neutron polarimeter, called NPOL2, consists of 6 planes of the 2D position-sensitive neutron detectors with a size of 1 m by 1 m by 0.1 m. Its effective left-right analyzing power has been calibrated at 141, 191, 291 and 387 MeV. The figure-of- merit value defined is about 4 X 10-4, irrespective of neutron energies.
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