title: High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring.
abstract: We report and discuss high-flux generation of circularly polarized γ-rays by means of Compton scattering. The γ-ray beam results from the collision of an external-cavity-enhanced infrared laser beam and a low emittance relativistic electron beam. By operating a non-planar bow-tie high-finesse optical Fabry-Perot cavity coupled to a storage ring, we have recorded a flux of up to (3.5 ± 0.3) × 108photons per second with a mean measured energy of 24 MeV. The γ-ray flux has been sustained for several hours. In particular, we were able to measure a record value of up to 400 γ-rays per collision in a full bandwidth. Moreover, the impact of Compton scattering on the electron beam dynamics could be observed resulting in a reduction of the electron beam lifetime correlated to the laser power stored in the Fabry-Perot cavity. We demonstrate that the electron beam lifetime provides an independent and consistent determination of the γ-ray flux. Furthermore, a reduction of the γ-ray flux due to intrabeam scattering has clearly been identified. These results, obtained on an accelerator test facility, warrant potential scaling and revealed both expected and yet unobserved effects. They set the baseline for further scaling of the future Compton sources under development around the world.
authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91898, France.
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authors.affiliation: Centre Lasers Intenses et Applications (CELIA), CNRS/CEA, Université de Bordeaux, Talence, 33405, France.
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authors.affiliation: Centre Lasers Intenses et Applications (CELIA), CNRS/CEA, Université de Bordeaux, Talence, 33405, France.
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authors.affiliation: Laboratoire des Matériaux Avancés (LMA), CNRS/IN2P3, Villeurbanne, 69622, France.
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authors.affiliation: Laboratoire des Matériaux Avancés (LMA), CNRS/IN2P3, Villeurbanne, 69622, France.
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authors.affiliation: Laboratoire des Matériaux Avancés (LMA), CNRS/IN2P3, Villeurbanne, 69622, France.
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authors.affiliation: Laboratoire des Matériaux Avancés (LMA), CNRS/IN2P3, Villeurbanne, 69622, France.
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authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan.
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authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan.
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authors.lastname: Araki
authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan.
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authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan.
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authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan.
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authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan.
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authors.affiliation: Hiroshima University, Graduate School of Science, Higashi-Hiroshima, 739-8511, Japan.
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authors.affiliation: Hiroshima University, Graduate School of Science, Higashi-Hiroshima, 739-8511, Japan.
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authors.affiliation: Hiroshima University, Graduate School of Science, Higashi-Hiroshima, 739-8511, Japan.
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