نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه پلاسما پژشکی، دانشکده فیزیک، دانشگاه خوارزمی، صندوق پستی: ، تهران – ایران
2 پژوهشکده پلاسما و گداخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، صندوق پستی: 51113-14399، تهران- ایران
چکیده
سازوکار رایج شتابدهی لیزری پروتون، شتابدهی با میدان غلافی از پشت هدف (TNSA) است. در این کار هندسه هدف آلومینیمی به کار رفته در برهم‌کنش پالس لیزر شدت بالا با پلاسما مورد مطالعه و بررسی قرار گرفته است. هدف، با نمایه پشتی پلهای و نمایی با طول مقیاسهای متفاوت تا μm 0/85 به عنوان ورودی در کد شبیهسازی دو بعدی ذرهای به کار رفته و نتایج توزیع انرژی پروتونی آنها با هم مقایسه شدهاند. نتایج نشان میدهد با تغییرات هموار پشت هدف، انرژی پروتونی کاهش یافته و این امر به علت کاهش دامنه میدان الکتروستاتیکی در پشت هدف است. به علاوه، یک طول مقیاس آستانه وجود دارد که با افزایش بیش‌تر این کمیت، انرژی پروتونی تغییر نکرده و توزیع انرژیهای باریکه پروتون تقریباً بر هم منطبق میشوند. انتشار میدان عرضی لیزر و توزیع انرژی الکترونی یکسان برای دو هدف با سطح پشتی پلهای و نمایی با طول مقیاس μm 0/67 نیز مشاهده شد.
کلیدواژه‌ها
عنوان مقاله [English]
Investigation of the effect of target density profile in proton laser acceleration
نویسندگان [English]
- A. Hasan Beigi 1
- F. Azizian 1
- M.J. Jafari 2
- S. Rezaei 2
1 Department of Plasma Medicine, Faculty of Physics, Kharazmi University, P.O.Box: , Tehran - Iran
2 Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, P.O. Box: 14399-51113, Tehran - Iran
چکیده [English]
The common mechanism of proton laser acceleration is Target Normal Sheath acceleration. This study investigates the geometry of the aluminum target used in high-intensity laser pulse interaction with plasma. The target with an exponential profile on the front and back sides and with different scale lengths from 0 to 0.85 μm is used as an input to the two-dimensional particle simulation code. The results of their proton energy distribution have been compared. It was found that proton energy decreased with smooth changes behind the target. This is due to the reduction in the electrostatic field amplitude behind the target. In addition, there is a threshold scale length (here 67/0 μm), after which the proton energy does not change with the increase of this quantity and the energy distribution of the proton beam almost overlaps. The transverse laser field emission and the same electron energy distribution were also observed for two targets with zero and 0.67 μm scale lengths.
کلیدواژه‌ها [English]
- Proton cut off energy
- Laser acceleration of proton
- Rear target profile
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