Commissioning of the DESIR high-resolution mass separator
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN: 0168-583X, Vol: 541, Page: 161-164
2023
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Article Description
DESIR is, together with S3-LEB, the low-energy part of the SPIRAL2 ISOL facility at GANIL. The High-Resolution mass Separator (HRS) included in DESIR is a 180° symmetric online separator with two 90° magnetic dipole sections arranged with electrostatic quadrupoles, sextupoles and a 48-pole electrostatic multipole on the mid plane. The HRS is now completely mounted at LP2i Bordeaux and under commissioning for the next years before its transfer to the entrance of the DESIR facility. Optical aberrations, mainly introduced by the dipoles, must be corrected up to the highest possible order to guarantee an optimal resolution of the separator. They are measured with a pepperpot-type emittance-meter, analyzed then corrected with the multipole. Up to now, 2nd order (hexapolar) and part of 3rd order (octupolar) aberrations are under control and an optimal FWHM separation has been achieved for two identical beams with a relative energy difference of ΔE/E(≡ΔM/M)=1/23400. In this paper, we present the effects of optical aberrations on the beam and its emittance figure, as well as the effect of the associated corrections with the multipole. Finally, we will show the latest resolution measurements and associated methodology.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0168583X23002094; http://dx.doi.org/10.1016/j.nimb.2023.05.013; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85159768826&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0168583X23002094; https://dx.doi.org/10.1016/j.nimb.2023.05.013
Elsevier BV
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