Enhancing the performance of solenoidal spectrometers for inverse reactions

Article
Report number	arXiv:2301.08045
Title	Enhancing the performance of solenoidal spectrometers for inverse reactions
Author(s)	Butler, P.A. (Liverpool U.)
Publication	2023-05-31
Imprint	2023-01-19
Number of pages	10
In:	Proc. R. Soc. Lond. A 479 (2023) 20230075
DOI	10.1098/rspa.2023.0075 (publication)
Subject category	nucl-ex ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	Helical-orbit solenoidal spectrometers, in which the target and detector are placed inside a uniform magnetic field, have been utilised for more than a decade to study nuclear reactions in inverse kinematics, induced by radioactive beams. Methods to improve the final state energy resolution are presented and the inclusion of an active gas target is proposed to improve the performance of the spectrometer.
Copyright/License	publication: (License: CC-BY-4.0) preprint: (License: CC BY 4.0)

$The contributions to the total $Q$-value resolution of the ISOLDE Solenoidal Spectrometer for differing conditions. The left figure assumes that the uncertainties are given by set 1 in table~\ref{uncertainties} that are the typical values for HELIOS spectrometers. For the central figure the intrinsic energy resolution is reduced from 50keV to 10keV FWHM and the target thickness is reduced from 165 to 10$\mu$g/cm$^2$. For the right figure the beam characteristics are optimised by reducing the transverse emittance and energy spread. The area of each sector is proportional to the square of the $Q$-value resolution arising from the contribution alone.$ $The contributions to the total $Q$-value resolution of the ISOLDE Solenoidal Spectrometer for differing conditions. The left figure assumes that the uncertainties are given by set 1 in table~\ref{uncertainties} that are the typical values for HELIOS spectrometers. For the central figure the intrinsic energy resolution is reduced from 50keV to 10keV FWHM and the target thickness is reduced from 165 to 10$\mu$g/cm$^2$. For the right figure the beam characteristics are optimised by reducing the transverse emittance and energy spread. The area of each sector is proportional to the square of the $Q$-value resolution arising from the contribution alone.$ $The contributions to the total $Q$-value resolution of the ISOLDE Solenoidal Spectrometer for differing conditions. The left figure assumes that the uncertainties are given by set 1 in table~\ref{uncertainties} that are the typical values for HELIOS spectrometers. For the central figure the intrinsic energy resolution is reduced from 50keV to 10keV FWHM and the target thickness is reduced from 165 to 10$\mu$g/cm$^2$. For the right figure the beam characteristics are optimised by reducing the transverse emittance and energy spread. The area of each sector is proportional to the square of the $Q$-value resolution arising from the contribution alone.$ Show more plots

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