Skip to Main content Skip to Navigation
Poster communications

Enhancement of the Positron Intensity by a Tungsten Single Crystal Target at the KEKB Injector Linac

Abstract : A new tungsten single-crystalline positron target has been successfully employed for generation of the intense positron beam at the KEKB injector linac in September 2006. The target is composed of a tungsten single-crystal with a thickness of 10.5 mm. The positron production target is bombarded at an incident electron energy of 4 GeV, and the produced positrons are collected and accelerated up to the final injection energy of 3.5 GeV in the succeeding sections. A conventional tungsten plate with a thickness of 14 mm has been used previously, and the conversion efficiency (Ne^+/Ne^-), the ratio between the number of positrons (Ne^+) captured in the positron capture section and the number of the incident electrons (Ne^-), was 0.20 on average. By replacing the tungsten plate with the tungsten crystal, it increased to 0.25 on average. The increase of the conversion efficiency has boosted the positron intensity to its maximum since the beginning of KEKB operation in 1999. Now this new positron source is stably operating and is contributing to increasing the integrated luminosity of the KEKB B-factory.
Document type :
Poster communications
Complete list of metadata

Cited literature [3 references]  Display  Hide  Download
Contributor : Dominique Girod <>
Submitted on : Tuesday, September 4, 2007 - 10:17:52 AM
Last modification on : Thursday, June 17, 2021 - 3:18:44 PM
Long-term archiving on: : Monday, September 24, 2012 - 12:00:16 PM


Publisher files allowed on an open archive


  • HAL Id : in2p3-00169472, version 1



T. Suwada, M. Satoh, T. Sugimura, T. Kamitani, K. Furukawa, et al.. Enhancement of the Positron Intensity by a Tungsten Single Crystal Target at the KEKB Injector Linac. 22nd Particle Accelerator Conference (PAC'07), Jun 2007, Albuquerque, New Mexico, United States. Joint Accelerator Conferences Website; IEEE, pp.2778-2780, 2007. ⟨in2p3-00169472⟩



Record views


Files downloads