همایش ، رویداد ، ژورنال
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  • جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 971
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     an array of seven atmospheric cherenkov telescopes was commissioned at a high altitude site in hanle in the ladakh region of the himalayas. the array called hagar has been designed to observe celestial γ-rays of energy >100 gev. each telescope is altitude-azimuth mounted and carries seven parabolic mirrors whose optic axes are co-aligned with the telescope axis. the telescopes point and track a celestial source using a pc-based drive control system. two important issues in positioning of each hagar telescope are pointing accuracy of telescope axis and co-alignment of mirrors’ optic axes with the telescope axis. we have adopted a three pronged strategy to address these issues, namely use of pointing models to improve pointing accuracy of the telescopes, ra-dec scan technique to measure the pointing offsets of the mirrors and mechanical fine-tuning of off-axis mirrors by sighting a distant stationary light source. this paper discusses our efforts in this regard as well as the current status of pointing and monitoring of hagar telescopes.

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