CERN Accelerating science

Preprint
Report number	arXiv:2002.10919
Title	Updated status of the undulator-based ILC positron source
Author(s)	Riemann, Sabine (DESY) ; Sievers, Peter (CERN) ; Moortgat-Pick, Gudrid (Hamburg U.) ; Ushakov, Andriy (Hamburg U.)
Imprint	2020-02-23
Number of pages	21
Note	Talks presented at the International Workshop on Future Linear Colliders (LCWS2019), Sendai, Japan, 28 October-1 November, 2019. C19-10-28. arXiv admin note: text overlap with arXiv:1902.07744
Presented at	International Workshop on Future Linear Colliders 2019, Sendai, Japan, 28 Oct - 1 Nov 2019
Subject category	physics.acc-ph ; Accelerators and Storage Rings
Abstract	The design of the positron source for the International Linear Collider (ILC) is still under discussion. The baseline design plans to use the high-energy electron beam for the positron production before it goes to the IP. The electrons pass a long helical undulator and generate an intense circularly polarized photon beam which hits a thin conversion target to produce $e^+e^-$ pairs. The resulting positron beam is longitudinally polarized which provides an important benefit for precision physics analyses at the ILC. In this paper the status of the positron target design studies is presented. Focus is the positron yield for center-of-mass energies of 250 GeV and also the Z peak. Possibilities to improve the positron collection system and thus to increase the positron yield are discussed.
Other source	Inspire
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)