量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Betatron radiation from laser wakefield accelerated electrons and X-rays scattered off a counter-propagating relativistic electron bunch are
collimated and hold the potential to extend the energy range to hard X-ray or gamma ray band. The peak brightness of these incoherent radiations
could reach the level of the brightest synchrotron light sources in the world due to their femtosecond pulse duration and source size
down to a few micrometers. In this article, the principle and properties of these radiation sources are briefly reviewed and compared. Then we
present our recent progress in betatron radiation enhancement in the perspective of both photon energy and photon number. The enhancement is
triggered by using a clustering gas target, arousing a second injection of a fiercely oscillating electron bunch with large charge or stimulating a
resonantly enhanced oscillation of the ionization injected electrons. By adopting these methods, bright photon source with energy over 100 keV
is generated which would greatly impact applications such as nuclear physics, diagnostic radiology, laboratory astrophysics and high-energy
density science.
Collimated gamma rays from laser wakefield accelerated electrons
