Image of the week: Evolution of beam collection by ISOLTRAP

This weeks image comes courtesy of the Journal of Physics G: Nuclear and Particle Physics special issue “Focus on Exotic Beams at ISOLDE: A Laboratory Portrait”

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Image taken from Extending and refining the nuclear mass surface with ISOLTRAP D Lunney and (on behalf of the ISOLTRAP Collaboration) 2017 J. Phys. G: Nucl. Part. Phys. 44 064008, © IOP Publishing, All Rights Reserved.

The photograph in the image shows what is thought to be the largest quadruple ion (or Paul) trap ever built, a device which enabled measurements of neutron-deficient Hg isotopes. The device was installed at ISOLDE in the late 1990’s.

To the right of the image are ion trajectories – the top image shows the effect of the radiofrequency field of the cylindrical trap where strong defocussing is present and the bottom shows the linear trap where the effects are attenuated due to the use of the DC axial field.


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Categories: Journal of Physics G: Nuclear and Particle Physics, JPhys+

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