Measurement of Forward Raman Scattering and Electron Acceleration from High-Intensity Laser–Plasma Interactions at 527 nm

نویسندگان

  • Z. Najmudin
  • R. Allott
  • F. Amiranoff
  • E. L. Clark
  • C. N. Danson
  • Daniel F. Gordon
  • A. E. Dangor
چکیده

High-intensity laser–plasma interaction experiments were performed using high-power laser pulses (greater than 8 TW) at a wavelength of 527 nm. These pulses were focused to intensity greater than 10 W/cm into underdense helium plasma at a density of 5 10 cm . Systematic examination of the forward Raman scattering instability was performed by measuring the spectrum of the forward scattered light. It was found that the three-wave instability occurs first, which then proceeds to a nonlinear regime involving four-wave processes. Measurements of the accelerated electron spectrum suggest that higher phase velocity plasma waves are generated than when using lower frequency light.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Electron acceleration and the propagation of ultrashort high-intensity laser pulses in plasmas

Reported are interactions of high-intensity laser pulses ( lambda = 810 nm and I</=3x10(18) W/cm(2)) with plasmas in a new parameter regime, in which the pulse duration ( tau = 29 fs) corresponds to 0. 6-2.6 plasma periods. Relativistic filamentation is observed to cause laser-beam breakup and scattering of the beam out of the vacuum propagation angle. A beam of megaelectronvolt electrons with ...

متن کامل

بررسی گرمایش الکترونی در برهم‌کنش‌های لیزر - پلاسما

 In this paper, stimulated Raman scattering (SRS) and electron heating in laser plasma propagating along the plasma fusion is investigated by particle-in cell simulation. Applying an external magnetic field to plasma, production of whistler waves and electron heating associated with whistler waves in the direction perpendicular to external magnetic field was observed in this simulation. The pla...

متن کامل

Stimulated forward Raman scattering in large scale-length laser-produced plasmas

A forward stimulated Raman scattering (FSRS) diagnostic was developed for the 60 beam Omega laser facility to investigate the propagation of an intense (∼8x10 W/cm), frequency doubled Nd:glass laser beam (≤360 J, 527 nm, 1 ns) through a mm-scale laser-produced plasma. Forward scattered light was measured with spectral, and temporal resolution using a streaked spectrometer and an absolutely cali...

متن کامل

Electron Acceleration in Relativistic Plasma Waves Generated by a Single Frequency Short-Pulse Laser

Experimental evidence for the acceleration of electrons in a relativistic plasma wave generated by Raman forward scattering (SRS-F) of a single-frequency short pulse laser are presented. A 1.053 pm, 600 fsec, 5 TW laser was focused into a gas jet with a peak intensity of 8x1017 W/cm2. At a plasma density of 2x1019 2 MeV electrons were detected and their appearance was correlated with the anti-S...

متن کامل

Enhanced Laser-driven Ion Acceleration via Forward Raman Scattering in a Ramped Gas Target

CO2 laser-plasma interactions provide a unique parameter space for using a gas jet for Target Normal Sheath Acceleration (TNSA) of ions instead of a thin foil target. The generation of 1-5 MeV protons from the interaction of a 3 ps TW CO2 laser pulse with a gas target with a peak density around the critical plasma density (10 cm) has been studied by 2D particle-in-cell simulations. The proton a...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2001