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Study of self-generated magnetic fields in laser produced plasmas using a three-channel polaro-interferometer
Y B S R Prasad1, S Barnwal, E A Bolkhovitinov
1Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India. yprasad@rrcat.gov.in
The Review of Scientific Instruments
|January 10, 2012
Summary
Researchers measured self-generated magnetic fields in laser-induced plasmas using a novel polar-interferometer. This device simultaneously captures magnetic field strength, electron density, and plasma profiles in a single laser shot.
Area of Science:
- Plasma physics
- Laser-induced phenomena
- Magnetohydrodynamics
Background:
- Self-generated magnetic fields are crucial in understanding laser-plasma interactions.
- Previous measurement techniques were limited in spatial and temporal resolution.
Purpose of the Study:
- To develop and demonstrate a novel diagnostic tool for measuring self-generated magnetic fields in laser plasmas.
- To characterize the spatial profiles of magnetic fields, electron density, and plasma intensity simultaneously.
Main Methods:
- Utilized a three-channel polar-interferometer employing birefringent calcite wedges and polarizers.
- Simultaneously recorded spatial profiles of rotation angle (polarometry), electron density (interferometry), and transmitted probe beam intensity (shadowgraphy) using a CCD camera.
- Employed a single laser shot for comprehensive data acquisition.
Main Results:
- Successfully measured self-generated magnetic fields in aluminum plasma at intensities around 10(13) W/cm(2).
- Estimated magnetic field strengths in the range of 2-4 MG.
- Obtained simultaneous spatial profiles of key plasma parameters.
Conclusions:
- The developed polar-interferometer is an effective tool for diagnosing magnetic fields in laser plasmas.
- The technique allows for simultaneous measurement of multiple plasma parameters, enhancing understanding of laser-plasma dynamics.
- The device offers potential for time-resolved measurements in future configurations.
