Unconventional Purcell filter in superferric magnets in the Facility for Antiproton and Ion Research

For the magnets used in beam lines, especially in high resolution applications, the field quality ΔB/B is a very important factor which determines the quality of the beam after passing through the magnets. End-shaping of the poles and introduction of Purcell filters improve field uniformity. However...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2013-11, Vol.729, p.718-724
Main Authors: Sarma, P.R., Dutta Gupta, A., Nandi, C., Chattopadhyay, S., Pal, G.
Format: Article
Language:English
Subjects:
Antiprotons
Beams (radiation)
Detectors
Dipoles
Energy buncher
Field quality
Magnets
Particle physics
Purcell filter
Spectrometers
Superferric magnet
Variability
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Summary:For the magnets used in beam lines, especially in high resolution applications, the field quality ΔB/B is a very important factor which determines the quality of the beam after passing through the magnets. End-shaping of the poles and introduction of Purcell filters improve field uniformity. However, in most applications, what matters is the uniformity in the total field integrated along the beam path (Δ(∫Bdl)/∫Bdl). With this criterion in mind, we have used unconventional partially penetrating Purcell filters in designing wide aperture highly uniform dipole and quadrupole magnets for the large acceptance low energy beam line in the Super Fragment Separator of the upcoming Facility for Antiproton and Ion Research (FAIR) at Darmstadt. The weight of dipole magnets decreases by the use of such filters.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2013.08.036