نوع مقاله : مقاله فنی
نویسنده
پژوهشکده‌ی کاربرد پرتوها، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 3486-11365، تهران - ایران
چکیده
در این پژوهش عملکرد یک آشکارساز گازی میکرو از نوع صفحه موازی، آشکارساز Micromega، برای قطبش‌سنجی پرتو ایکس ارزیابی شد. بدین منظور از نرمافزار COMSOL Multiphysics که قابلیت حل معادلات دیفرانسیل را برپایه روش المان محدود دارد استفاده شد. بدین ترتیب که با حل معادله پواسون در هندسه آشکارساز، میدان الکتریکی در نقاط مختلف به‌دست آمد. سپس بهره آشکارساز با استفاده از میدان الکتریکی به‌دست آمده و حل معادله پیوستگی محاسبه شد. نتایج نشان دادند آشکارساز شبیه‌سازی شده در ولتاژ V 400 بهرهای برابر 100 دارد. نتایج به‌دست آمده با نتایج شبیه‌سازی این آشکارساز با کد Garfield هم‌خوانی خوبی دارند که مؤید درستی شبیه‌سازی انجام شده به روش المان محدود است. این آشکارساز با توجه به ویژگی‌های خوبی مانند توان تفکیک بالا، سطح حساس بزرگ و قابلیت عملکرد در شار بالای ذرات، ابزار مناسبی برای قطبش‌سنجی پرتو ایکس میباشد.
کلیدواژه‌ها
عنوان مقاله [English]
Assessment of a Micromega detector based on Finite Element Method for X-ray polarimetry
نویسنده [English]
- E. Edalatkhah
Radiation Applications Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box:11365-3486, Tehran-Iran
چکیده [English]
Performance of a micropattern gaseous detector of parallel plate type, a Micromega detector, was assessed for X-ray astronomical studies in this research. For this purpose, COMSOL Multiphysics software which solves differential equations based on Finite Element Method was used. Thus, by solving Poisson equation in the detector geometry, electric field in each point was obtained. Gain of the detector was estimated by using the obtained electric field and solving continuity equation. Results show that simulated detector gain was 100 at voltage of 400 V. Obtained results corresponds well with the results of simulation of the detector with Garfield code which verifies the performed simulation. This detector is a proper tool for X-ray polarimetry with respect to its good characteristics such as high resolution, large area and good performance at high flux.
کلیدواژه‌ها [English]
- Micropattern gaseous detectors
- Micromega
- X-ray telescope
- COMSOL
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