JSAP Spring / Autumn Meeting

It is presented a concept of a high-throughput telescope system with a high angular resolution for an astronomical use. In the concept, a light-weighted focusing telescope with a high throughput (large effective area) is used as a microcosm of the illuminated position of the telescope. The two-dimensional detector (i.e., imager) must be positioned not at its best focus, but at a slight defocus position. In addition, multi-grid coded-mask (or modulation collimator) is installed on the front of the telescope. The multi-grid coded-mask works as coded aperture camera like as a high angular resolution booster of the focusing telescope. Since we can use a small-size detector such as the X-ray CCD at the defocused position, the telescope system gives an opportunity to make a high-resolution spectroscopy with a high-angular-resolution and with a large effective area.