مجله علوم، مهندسی و فناوری هسته‌ای

اثر پیش‌پالس لیزر بر پارامترهای هدف در رهیافت شتاب‌دهی TNSA

نوع مقاله : مقاله پژوهشی

نویسندگان

سمیه رضائی
محمدجعفر جعفری

پژوهشکده پلاسما و گداخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، صندوق پستی: 51113-14399، تهران- ایران

https://doi.org/10.24200/nst.2024.1627
چکیده
وجود پیش‌پالس لیزری با شدت‌های کم (کمتر از 1013Wcm-2 با پهنای زمانی نانوثانیه و شدت‌های کمتر از 1017Wcm-2 با پهنای زمانی پیکوثانیه) یک مسئله اساسی در آزمایش‌های شتاب‌دهی لیزری پروتون می‌باشد، که اغلب پارامترهای باریکه پروتون تولید شده توسط لیزرهای با شدت بالا را تغییر می‌دهد. با توجه به اندازه دامنه شدت پیش‌پالس و ضخامت هدف، اثرات متعددی ممکن است اتفاق بیفتد. در این کار به منظور نزدیک شدن به نتایج واقعی به طور خاص برای پارامترهای پیش‌پالس مجموعه لیزری ATLAS؛ شامل یک پیش‌پالس 20 پیکوثانیه‌ای، و برای ضخامت‌های مختلف هدف (از 0/12 -1 میکرومتر) شبیه‌سازی‌های هیدرودینامیکی با کد سیالی انجام و پارامترهای هدف در انتهای زمان اعمال پیش‌پالس از کد سیالی استخراج شده است. بر اساس نتایج به دست آمده برای این شرایط معین از پیش‌پالس، ضخامت 0/25 میکرومتر برای برهم‌کنش پالس اصلی با هدف بهینه می‌باشد. در ضخامت‌های کوچک‌تر، نمایه چگالی در سطح پشتی هدف به هم می‌خورد و این موجب کاهش بازدهی شتاب‌دهی خواهد شد.

کلیدواژه‌ها

شبیه‌سازی هیدرودینامیکی
پیش‌پالس لیزر
پشت هدف

عنوان مقاله English

The effect of laser prepulse on the target parameters in TNSA experiments

نویسندگان English

S. Rezaei
M.J. Jafari
Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, P.O. Box: 14399-51113, Tehran – Iran
چکیده English

Low-intensity laser prepulse (<10^13 W cm^−2, nanosecond duration and <10^17 W cm^−2, picosecond duration) significantly impact experiments on laser-induced proton generation, often constraining the performance of proton sources from high-intensity lasers. Depending on the intensity regime and target thickness, various effects can result from the prepulse. This study focuses on hydrodynamic simulations using a fluid code to replicate real-world conditions, specifically targeting the prepulse parameters of the ATLAS laser facility (including a 20-picosecond duration) across different target thicknesses (1-0.12 μm). The simulations extract target parameters at the end of the prepulse phase. For these specific prepulse conditions, the results indicate that a target thickness of 0.25 μm optimizes the interaction with the main laser pulse. Thinner targets exhibit altered density profiles on the rear surface, thereby reducing acceleration efficiency.

کلیدواژه‌ها English

Hydrodynamic simulation
Laser prepulse
Target rear surface
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