Measurements for the energy and flux of laser Compton scattering gamma-ray photons generated in an electron storage ring: NewSUBARU

作者：Horikawa Ken^*; Miyamoto Shuji; Amano Sho; Mochizuki Takayasu

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2010, 618(1-3): 209-215.

DOI：10.1016/j.nima.2010.02.259

• Gamma ray
• Laser Compton scattering
• Electron storage ring

The maximum energy and flux of laser Compton scattering gamma ray photons generated in the electron storage ring NewSUBARU by CO(2) (similar to 10.6 mu m) and Nd (1.064 mu m, 0.532 mu m) laser beams were measured with a Ge detector calibrated by gamma rays from radioisotopes and a GSO detector, respectively. The electron beam energy derived from the measured maximum gamma ray energy agreed fairly well with the electron beam energy derived from the physical parameters for bending electromagnets in NewSUBARU. The maximum normalized flux for gamma ray photons was found to be 6.0 x 10(3) (+/-5%) photons W(-1) mA(-1) s(-1) at the beam hatch. For a stored current of 200 mA and a Nd laser output of 4.2 W, the photon flux was measured to be 5.0 x 10(6) photons s(-1). These values were well reproduced through theoretical calculations. Calculations for the laser alignment accuracies showed that the separation between the electron and laser beam axes and the beam cross angle between them are required to be less than 0.2 mm and 0.2 mrad, respectively, to suppress the reduction of the maximum photon flux in less than 10%.

• 出版日期2010-6-1