Investigations on a hybrid positron source with a granular converter

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:355

Article; Proceedings Paper

Artru, X.¹  Chaikovska, I.²  Chehab, R.¹  Chevallier, M.¹  Dadoun, O.²  Furukawa, K.³  Guler, H.²  Kamitani, T.³  Miyahara, F.³  Satoh, M.³  Sievers, P.⁴  Suwada, T.³  Umemori, K.³  Variola, A.² 

[1] Univ Lyon 1, CNRS, Inst Phys Nucl Lyon, IN2P3, F-69622 Villeurbanne, France

[2] Univ Paris 11, LAL, F-91898 Orsay, France

[3] Accelerator Lab KEK, Tsukuba, Ibaraki 3050801, Japan

[4] CERN, CH-1211 Geneva 23, Switzerland

关键词: Channeling radiation;    Photons;    Granular target;    Positrons;    Energy deposition;   

DOI  :  10.1016/j.nimb.2015.02.027

来源: Elsevier

【 摘 要 】

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. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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