Design study for a 500 MeV positron beam at the Mainz Microtron MAMI

Author:

Backe H.ORCID,Lauth W.,Drexler P.,Heil P.,Klag P.,Ledroit B.,Stieler F.

Abstract

Abstract A design study has been performed for a positron beam with an energy of 500 MeV to be realized at the applied physics area of the Mainz Microtron MAMI. Positrons will be created after pair conversion of bremsstrahlung, produced by the 855 MeV electron beam at MAMI in a tungsten converter target. From the two conceivable geometries (1) pair conversion in the bremsstrahlung converter target itself, and (2) bremsstrahlung pair conversion in a separated lead foil, the former was considered in detail. Positrons will be energy selected within an outside open electron beam-line bending magnet, and bent back by an additional sector magnet. Magnetic focusing elements in between are designed to prepare in a well shielded positron target chamber about 6 m away from the target a beam with horizontal and vertical emittances of $$\epsilon _\mathrm{v} $$ ϵ v = 0.055 $$\pi $$ π mm mrad (1 $$\sigma $$ σ ), and $$\epsilon _\mathrm{h} = 0.12\, \pi $$ ϵ h = 0.12 π mm mrad (1 $$\sigma $$ σ ), respectively, for a 10 $$\upmu $$ μ m thick amorphous tungsten target and negligible momentum spread. At an accepted positron band width of 1 MeV, spots are expected vertically with an angular spread of 0.064 mrad and a size of 5.0 mm (FWHM), and horizontally with an angular spread of 0.64 mrad and a size of 7.7 mm (FWHM). The positron yield amounts to 13.1 per second, 1 MeV positron energy band width, and 1 nA electron beam current. Graphic abstract

Funder

European Commission

Publisher

Springer Science and Business Media LLC

Subject

Atomic and Molecular Physics, and Optics

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Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. On planar (110) channeling of 500 MeV positrons and electrons in silicon semiconductor detectors;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2024-02

2. Topical issue “Dynamics of systems on the nanoscale (2021)”;The European Physical Journal D;2023-05

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