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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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| WEPAB360 | Future Prospective for Bent Crystals in Accelerators | 3545 |
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| Super magnet dipoles employed to steer high energy particle beams are massive instruments requiring cryogenic cooling and featuring large energy consumption. A bent crystal has the potential in a few millimeters to deflect 100-1000 GeV particle beams as much as an hundreds-tesla magnetic dipole. Indeed, within the lattice of a crystal, large electric fields up to several GeV/cm are present. Positive charged particles can be efficiently channeled between two adjacent lattice planes, thus following their curvature. These features and the possibility to selectively affect only the portion of the beam intercepting the crystal led to the proposal of exploiting bent crystals for several purposes, such as the collimation of ions at LHC. In this scheme, the particles on the beam halo instead of being scattered by tens-centimeters long collimators are directly separated from the beam using a 4 mm long silicon crystal. The production of a bent crystal suitable for installation in the LHC beamline requires strict control over lattice features and bending apparatus. The results obtained by the years long research of the INFN research team in Ferrara are presented in this work. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB360 | |
| About • | paper received ※ 14 May 2021 paper accepted ※ 28 July 2021 issue date ※ 18 August 2021 | |
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