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Article
Plasma Dynamics and Pulse Shape Rules in Laser Heating of Opaque Targets in Air
تأثير ديناميكية البلازما و شكل النبضة في التسخين الليزري للأهداف المعتمة في الهواء

Author: Bassam Hanna Habib بسام حنا حبيب
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2010 Volume: 8 Issue: 12 Pages: 65-73
Publisher: Baghdad University جامعة بغداد

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Abstract

A theoretical model is developed to determine time evolution of temperature at the surface of an opaque target placed in air for cases characterized by the formation of laser supported absorption waves (LSAW) plasmas. The model takes into account both plasma dynamics and time variation of incident laser pulse (i.e. pulse shape or profile).Shock tube relations were employed in formulating plasma dynamics over target surface. Gaussian function was chosen in formulating the pulse profile in the present modeling.

تم تطوير نموذج نظري لأحتساب التغير الزمني للحرارة عند اسطح الأجسام المعتمة في الهواء للحالات المصاحبة بتولد بلازما الأمتصاص المعززة بالليزر) LSAW ). يأخد النموذج الحالي في الحسبان كل من ديناميكية البلازما و التغير الزمني للنبضة الليزرية (شكل النبضة). تم استخدام بعض معادلات انبوبة موجة العصف (Shock Tube Relations) في نمذجة ديناميكية البلازما عند سطح الهدف. تم اعتماد الدالة الكاوسية لصياغة النبضة الليزرية في النمذجة الحالية.


Article
Numerical Model to Estimate the Potential Changes within Laser-Solid Surface Interaction Zone

Authors: N.I. Naji --- A.I. Ahmed
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2010 Volume: 6 Issue: 2 Pages: 3-11
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, a model is proposed to provide an estimation of the temporal and spatial changes of the potential within the interaction zone between laser and metal surface. The model depends on the real experimental data which were measured around the interaction zone. This model provides an estimation of the charge involved and considers the presence of the hole created by the interaction. For the first time, it provides the spatial and the temporal variation of the potential which reflects the electric forces and temperature at the interaction zone. It also gives a clear insight of the position of the Knudsen layer. The estimated maximum potential is more than ten times the potential at the surface boundary. This implies that surface potential is due to the interaction of the surface with the plasma rather than the usually believed thermionic emission.

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