title: Determination of the temperature of bremsstrahlung photon generated by ultraintense laser using various thickness attenuators.
abstract: We evaluate the simplified method using the Lambert-Beer law to measure the temperature of bremsstrahlung photon generated by an ultraintense laser. Analytical values are compared to the results of the Monte Carlo calculation of GEANT4 and they agreed very well on the condition of the appropriate distance between the attenuator and the detector. We performed the experiment to measure the temperature of bremsstrahlung x-ray emitted from a metal target irradiated by a Ti:sapphire laser with 76 mJ, 72 fs, 2.2 × 10(18)  W∕cm(2). For a Cu target of 30  μm thick, the photon temperature was reasonably determined to be 0.18 MeV, which is in good agreement with previous studies.
authors: Department of Systems Innovation, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors: Shuichi
authors: S
authors: Hasegawa
authors: Ryuta
authors: R
authors: Takashima
authors: Masaru
authors: M
authors: Todoriki
authors: Satoshi
authors: S
authors: Kikkawa
authors: Keita
authors: K
authors: Soda
authors: Kei
authors: K
authors: Takano
authors: Yuji
authors: Y
authors: Oishi
authors: Takuya
authors: T
authors: Nayuki
authors: Takashi
authors: T
authors: Fujii
authors: Koshichi
authors: K
authors: Nemoto