Journal Article

IMPULSE-2020-00347

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Upgrade of the NEPOMUC Remoderator

Dickmann, M. (Corresponding author)MLZ* ; Egger, W.MLZ* ; Kögel, G. ; Vohburger, S.MLZ* ; Hugenschmidt, C.MLZ*

2020
Acad. Inst. Warsaw

Please use a persistent id in citations: doi:10.12693/APhysPolA.137.149

Abstract: The neutron-induced positron source Munich (NEPOMUC) provides a monochromatic low-energy positronbeam with an intensity of>1×109e+s−1and a full width at half maximum (FWHM) diameter of about 10 mm.To create a small beam focus or sharp positron pulses of 100 ps FWHM the beam brightness needs to be enhancedby remoderation. This is achieved by focusing the primary beam magnetically onto a tungsten single crystal W(100)in reflection geometry. Afterwards the beam exhibits an intensity of>5×107e+s−1and a diameter of<2mmFWHM. To further optimize the beam quality of NEPOMUC we redesigned the remoderation unit. The newsetup allows a precise positioning of the remoderator crystal within the focus of the magnetic lens. Additionally,a replacement of the crystal within several minutes and without breaking the beamline vacuum is possible thatoffers the opportunity for systematic tests of different remoderator materials.

Keyword(s): Instrument and Method Development (1st) ; Instrument and Method Development (2nd)

---

Contributing Institute(s):

1. NEPOMUC (NEPOMUC)

Experiment(s):

1. NEPOMUC: Neutron induced positron source munich (SR11)

---

Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---