Backward Compton scattering of picosecond CO2 laser pulses using relativistic electron beam for the bright X-ray generation

Akira Tsunemi, Akira Endo, Igor Pogorelsky, Ilan Ben-Zvi, Tachishige Hirose, Tsunehiko Omori, Junji Urakawa, Masakazu Washio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Laser-Compton scattering can generate X-rays or y-rays with high brightness by applying highpeak- power laser pulses to relativistic electron bunches. We have proposed laser-Compton scattering to generate polarized y -rays which can induce pair-creation to produce polarized positrons for JLC (Japan Linear Collider) project[ 11. As a photon source of the Compton scattering, a picosecond CO2 laser system is going to be applied for our experiment because of the higher scattering cross section than near-infiared solid-state lasers, laser power scalability, the laser efficiency and the possibility of high-repetition rated operation. Not only for the JLC positrons source, Compton scattering with Ca-laser has a possibility to be a compact high intensity X-ray source as an alternative of synchrotron radiation source[2]. We have been developing a laser-Compton scattering chamber for a preliminary experiment, in which COz laser pulses and electron bunches propagate along the same axis in opposite direction and collide at the focal point. Fig. 1 is the sketch of the Compton chamber to be applied in the beamline of the Accelerator-Test-Facility in Brookhaven National Laboratory. Picosecond CO2 laser beams are introduced &om the side window and focused by an off-axis parabolic Cu mirror of 50 mm diameter with the focal length of 15 cm. Cu mirror has 5 mm diameter hole along the electron beam axis to have electrons pass through. An axicon telescope system made of ZnSe is placed on the CO2 beam axis just before the Compton chamber in order to modify spatial profiles as shown in Fig. 2-(a) to accommodate to the mirror with holes. Fig. 2-(b) represents a numerically calculated CO2 beam profile at the focal point. The estimated beam waist size is about 100 pm, which is almost same as the electron beam size at the colliding point. After the focal point, the diverging laser beams are paralleled by another Cu mirror and extracted fiom the chamber.

Original languageEnglish
Title of host publicationCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages926-927
Number of pages2
ISBN (Electronic)0780356616, 9780780356610
DOIs
Publication statusPublished - 1999 Jan 1
Event1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
Duration: 1999 Aug 301999 Sep 3

Publication series

NameCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
Volume3

Conference

Conference1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999
CountryKorea, Republic of
CitySeoul
Period99/8/3099/9/3

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications
  • Physics and Astronomy(all)

Cite this

Tsunemi, A., Endo, A., Pogorelsky, I., Ben-Zvi, I., Hirose, T., Omori, T., Urakawa, J., & Washio, M. (1999). Backward Compton scattering of picosecond CO2 laser pulses using relativistic electron beam for the bright X-ray generation. In CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics (pp. 926-927). [817904] (CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics; Vol. 3). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CLEOPR.1999.817904