| Autor: |
Delerue, Nicolas, Bonis, J., Chaikovska, Iryna, Chiche, R., Cizeron, R., Cohen, M., Colin, J., Cornebise, P., Jehanno, D., Labaye, F., Lacroix, M., Marie, R., Peinaud, Y., Soskov, V., Variola, A., Zomer, F., Cormier, E., Flaminio, R., Pinard, L., Araki, S., Funahashi, S., Honda, Y., Omori, T., Shimizu, H., Terunuma, T., Urakawa, J., Akagi, T., Miyoshi, S., Nagata, S., Takahashi, T. |
| Rok vydání: |
2011 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
The next generation of e+/e- colliders will require a very intense flux of gamma rays to allow high current polarized positrons to be produced. This can be achieved by converting polarized high energy photons in polarized pairs into a target. In that context, an optical system consisting of a laser and a four-mirror passive Fabry-Perot cavity has recently been installed at the Accelerator Test Facility (ATF) at KEK to produce a high flux of polarized gamma rays by inverse Compton scattering. In this contribution, we describe the experimental system and present preliminary results. An ultra-stable four-mirror non planar geometry has been implemented to ensure the polarization of the gamma rays produced. A fiber amplifier is used to inject about 10W in the high finesse cavity with a gain of 1000. A digital feedback system is used to keep the cavity at the length required for the optimal power enhancement. Preliminary measurements show that a flux of about $4\times10^6 \gamma$/s with an average energy of about 24 MeV was generated. Several upgrades currently in progress are also described. |
| Databáze: |
arXiv |
| Externí odkaz: |
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