Design, manufacture and operation of the beam spoiler for positron target protection

Autor:	Zang, Lei, Kakihara, Kazuhisa, Kamitani, Takuya, Mikawa, Katsuhiko, Miyahara, Fusashi, Suwada, Tsuyoshi
Předmět:	A21 Secondary Beams Physics::Accelerator Physics 03 Particle Sources and Alternative Acceleration Techniques Accelerator Physics
Zdroj:	Scopus-Elsevier
Popis:	In order to produce positrons, intensive pulsed electron beam is used to strike on a tungsten target. The energy deposition is distributed non-uniformly over the target, leading to a mechanical stress. As a result of large thermal gradient, the target could be potentially damaged. To avoid the target destruction, the peak energy deposition density (PEDD) in the target should be well below the critical limit (35J/g) based on the SLAC operational experience. With an expected primary electron spot size on the target of the SuperKEKB positron source, the PEDD will exceeds the limit. We will introduce a beam spoiler to enlarge the spot size by multiple scattering in thin beam screen and aluminum plate. It reduces the PEDD down to half of the limit. This paper describes the design of the spoiler and the beam screen system used in the positron beam commissioning of the SuperKEKB positron source started in 2014. Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3242402c39363dbb1bfb58df93932a8a http://www.scopus.com/inward/record.url?eid=2-s2.0-84928342399&partnerID=MN8TOARS Zobrazit plný text záznamu