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Report No.
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Several-MeV $$gamma$$-ray generation at NewSUBARU by laser Compton backscattering

Amano, Sho*; Horikawa, Ken*; Ishihara, Kazuki*; Miyamoto, Shuji*; Hayakawa, Takehito; Shizuma, Toshiyuki; Mochizuki, Takayasu*

A new laser Compton $$gamma$$ ray source in the energy range of several-MeV was developed using a CO$$_2$$ laser at the NewSUBARU electron storage ring. When the electron energies were 974, 1220 and 1460 MeV, the maximum $$gamma$$ ray energies were measured to be 1.72, 2.72, and 3.91 MeV. The luminosity of the $$gamma$$ rays was 7300 photon/mA/W/s and a flux of 5.8$$times$$10$$^6$$ photon/s was achieved. These performances agreed with calculations. This generation of $$gamma$$ rays is in a no-loss mode for the storage electrons, and the maximum flux was limited only by the power of the laser.

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