Investigations on a hybrid positron source with a granular converter

Promising results obtained with crystal targets for positron production led to the elaboration of a hybrid source made of an axially oriented tungsten crystal, as a radiator, and an amorphous tungsten converter. If the converter is granular, made of small spheres, the heat dissipation is greatly enh...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2015-07, Vol.355, p.60-64
Main Authors: Artru, X., Chaikovska, I., Chehab, R., Chevallier, M., Dadoun, O., Furukawa, K., Guler, H., Kamitani, T., Miyahara, F., Satoh, M., Sievers, P., Suwada, T., Umemori, K., Variola, A.
Format: Article
Language:English
Subjects:
Breakdown
Channeling radiation
Converters
Crystal structure
Density
Deposition
Energy deposition
Granular target
Instrumentation and Detectors
Photons
Physics
Positrons
Simulation
Tungsten
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Summary:Promising results obtained with crystal targets for positron production led to the elaboration of a hybrid source made of an axially oriented tungsten crystal, as a radiator, and an amorphous tungsten converter. If the converter is granular, made of small spheres, the heat dissipation is greatly enhanced and the thermal shocks reduced, allowing the consideration of such device for the future linear colliders. A positron source of this kind is investigated. Previous simulations have shown very promising results for the yield as for the energy deposition and the PEDD (Peak Energy Deposition Density). Here, we present detailed simulations made in this granular converter with emphasis on the energy deposition density, which is a critical parameter as learned from the breakdown of the SLC target. A test on the KEKB linac is foreseen; it will allow a determination of the energy deposited and the PEDD in the converter through temperature measurements. Four granular converters, made of W spheres of mm radius have been built at LAL-Orsay; they will be installed at KEK and compared to compact converters. A description of the experimental layout at KEK is provided. Applications to future linear colliders as CLIC and ILC are considered.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2015.02.027