SIMULATION OF X-RAY EMISSION FROM LASER PLASMAS AND THE EFFECT OF LASER PREPULSE ON THE EMISSION YIELD

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FAZELI R.; HADIPOUR H.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2010 | Volume:20 | Issue:75 (PHYSICS ISSUE) Page(s): 25-34

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Title

SIMULATION OF X-RAY EMISSION FROM LASER PLASMAS AND THE EFFECT OF LASER PREPULSE ON THE EMISSION YIELD

Author(s)

FAZELI R. | HADIPOUR H. | Issue Writer Certificate

Keywords

LASER-PLASMA INTERACTIONQ3

LASER PLASMAQ3

X-RAY RADIATIONQ3

LASER PREPULSEQ3

Abstract

Introduction: High power laser interaction with metal targets produces a high temperature plasma (hundreds ev to several kev) which is a good source of X-RAY RADIATION.The produced x-ray is suitable for different applications including lithography, medical science, biology, (Inertial Confinement Fusion) ICF and space sciences. In practical uses, enhancement of x-ray yield or higher conversion of laser energy into x-ray yield is efficient.For such reasons, there is a great deal of interest in producing x-ray from plasmas and also in methods that could enhance the x-ray yield.Aim: Simulation of X-RAY RADIATION from LASER PLASMA and inspecting the effect of using LASER PREPULSE on the x-ray yield.Materials and Methods: This investigation is made using atomic physics simulations.Firstly, plasma formation from high power laser interaction with metal target is simulated.Secondly, after the plasma parameters especially electron density and temperature are found, X-RAY RADIATION is simulated using the corresponding equations of different mechanisms.Finally, the effect of LASER PREPULSE is studied by correcting computer codes.Results: It was seen that deeper layers of the target are affected at greater times by the laser interaction and their temperature and density increase. For a laser pulse of 50 ps and 1015 W/cm2 the temperature and density across the target are about several hundred ev and 1023 cm-3, respectively. X-ray production is higher from the layers with higher electron density and especially electron temperature. In addition, the produced x-ray pulse duration (FWHM) approximately the same as the laser pulse i.e.50 ps. It was seen that by using prepulse, there is an optimum delay time (time separation between main pulse and prepulse) at which maximum x-ray yield is produced. The optimum delay time was about 400 ps and 1700 ps when the ratio of the prepulse to the main pulse intensities was 0.01 and 0.001, respectively.Also, calculations showed that decreasing the prepulse intensity increases the x-ray yield enhancement.Conclusion: The x-ray pulse duration emitted from LASER PLASMA is about the same as the laser pulse. It was shown that using a prepulse with proper intensity and delay time can enhance the x-ray yield considerably. There is an optimum delay time at which maximum xray yield can be produced. The optimum delay time depends on the prepulse intensity.

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APA: Copy

FAZELI, R., & HADIPOUR, H.. (2010). SIMULATION OF X-RAY EMISSION FROM LASER PLASMAS AND THE EFFECT OF LASER PREPULSE ON THE EMISSION YIELD. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 20(75 (PHYSICS ISSUE)), 25-34. SID. https://sid.ir/paper/70520/en

Vancouver: Copy

FAZELI R., HADIPOUR H.. SIMULATION OF X-RAY EMISSION FROM LASER PLASMAS AND THE EFFECT OF LASER PREPULSE ON THE EMISSION YIELD. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2010;20(75 (PHYSICS ISSUE)):25-34. Available from: https://sid.ir/paper/70520/en

IEEE: Copy

R. FAZELI, and H. HADIPOUR, “SIMULATION OF X-RAY EMISSION FROM LASER PLASMAS AND THE EFFECT OF LASER PREPULSE ON THE EMISSION YIELD,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 20, no. 75 (PHYSICS ISSUE), pp. 25–34, 2010, [Online]. Available: https://sid.ir/paper/70520/en

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