Direct, absolute, and in situ measurement of fast electron transport via Cherenkov emission

We present direct measurements of the absolute energy distribution of relativistic electrons generated in intense, femtosecond laser interaction with a solid. Cherenkov emission radiated by these electrons in a novel prism target is spectrally dispersed to obtain yield and energy distribution of ele...

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Bibliographic Details
Published in:Physical review letters 2010-02, Vol.104 (5), p.055001-055001, Article 055001
Main Authors: Habara, Hideaki, Ohta, Kazuhide, Tanaka, Kazuo A, Kumar, G Ravindra, Krishnamurthy, M, Kahaly, Subhendu, Mondal, Sudipta, Bhuyan, Manoj Kumar, Rajeev, R, Zheng, Jian
Format: Article
Language:English
Subjects:
CHARGED-PARTICLE TRANSPORT
CHERENKOV RADIATION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON SPECTRA
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EVALUATION
FERMIONS
INTERACTIONS
LASER RADIATION
LEPTONS
MAGNETIC SPECTROMETERS
MEASURING INSTRUMENTS
NUCLEAR PHYSICS AND RADIATION PHYSICS
PARTICLES
POTENTIALS
RADIATION TRANSPORT
RADIATIONS
RELATIVISTIC RANGE
SIMULATION
SOLIDS
SPECTRA
SPECTROMETERS
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Summary:We present direct measurements of the absolute energy distribution of relativistic electrons generated in intense, femtosecond laser interaction with a solid. Cherenkov emission radiated by these electrons in a novel prism target is spectrally dispersed to obtain yield and energy distribution of electrons simultaneously. A crucial advance is the observation of high density electron current as predicted by particle simulations and its transport as it happens inside the target. In addition, the strong sheath potential present at the rear side of the target is inferred from a comparison of the electron spectra derived from Cherenkov light observation with that from a magnet spectrometer.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.104.055001