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TUXB05 |
Intense Channeling Radiation as a Tool for a Hybrid Crystal-Based Positron Source for Future Colliders | |
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There is a strong need for intense positron sources for future colliders. A crystal-based hybrid positron source could be an alternative to conventional sources based on the e- conversion into e+ in a thick target. The basic idea of the hybrid source is to split the e+ converter into a gamma-quanta radiator plus a gamma-to-positron converter*. In such a scheme an e- beam crosses a thin axially oriented crystal with emission of "channeling radiation", characterized by a considerably larger amount of photons w.r.t. standard bremsstrahlung**. The net result is an increase in the number of e+ produced at the converter target. In the hybrid scheme, only photons reach the converter, thereby reducing the Peak Energy Deposition Density (PEDD) in the target. Here we present the results of a test conducted at the DESY TB with 5.6 GeV e- interacting with a W crystal. A huge enhancement in the radiated energy and in the photon emission has been recorded and reproduced with Monte Carlo simulations***. This study is relevant for the design of the FCC-ee positron source. Indeed, through Monte Carlo, we also investigated the best parameters of the crystal radiator suited for the FCC-ee e+ source.
* R. Chehab et al. PAC’89,10.1109/PAC.1989.73147 ** X.Artru et al. NIMB 266 (2008) 3868 *** A. Sytov, V. Tikhomirov, L. Bandiera PRAB 22 (2019) 064601 |
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