Abstract

A new tungsten single-crystal target has been successfully employed at the positron source of the KEKB injector linac. The crystal thickness was determined to be 10.5 mm based on previous systematic measurements of the positron-production efficiency. The crystal axis, ⟨111⟩ , was precisely aligned to the direction of the 4-GeV primary electron beam. The positron yield increased by ∼25% compared to that for a conventional tungsten plate with a thickness of 14 mm. On the contrary, the steady-state heat load on the crystal target decreased by ∼20% . After a two-month operation, no degradation of the positron-production efficiency was observed, and the crystal target has been stably operating at the KEK B factory.

Details

Title
First application of a tungsten single-crystal positron source at the KEK B factory
Author
Suwada, T; Satoh, M; Furukawa, K; Kamitani, T; Sugimura, T; Umemori, K; Okuno, H; Endou, Y; Haruna, T; Hamatsu, R; Sumiyoshi, T; Yoshida, K; Potylitsyn, A P; Tropin, I S; Chehab, R
Section
ARTICLES
Publication year
2007
Publication date
Jul 2007
Publisher
American Physical Society
e-ISSN
10984402
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2551209138
Copyright
© 2007. This work is licensed under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.