High-precision beam profile measurement with a microchannel-plate detector in the high magnetic field of the WISArD experiment
Authors:
S. Lecanuet,
X. Fléchard,
P. Alfaurt,
P. Ascher,
D. Atanasov,
B. Blank,
L. Daudin,
H. DePreaumont,
M. Gerbaux,
J. Giovinazzo,
S. Grévy,
G. Guignard,
J. Ha,
C. Knapen,
S. Lechner,
A. Lépine,
J. Lory,
J. Perronnel,
M. Pomorski,
M. Roche,
C. Roumegou,
N. Severijns,
Y. Son,
S. Vanlangendonck,
M. Versteegen
, et al. (1 additional authors not shown)
Abstract:
We present the development and characterization of a compact low-energy ion beam diagnostic for the WISArD (Weak Interaction Studies with $\mathrm{^{32}Ar}$ Decay) experiment at ISOLDE/CERN. The microchannel plate (MCP) detector, which is configured in a Z-stack and has a resistive position sensitive anode, was tested with both stable and radioactive beams. This work focuses on the image reconstru…
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We present the development and characterization of a compact low-energy ion beam diagnostic for the WISArD (Weak Interaction Studies with $\mathrm{^{32}Ar}$ Decay) experiment at ISOLDE/CERN. The microchannel plate (MCP) detector, which is configured in a Z-stack and has a resistive position sensitive anode, was tested with both stable and radioactive beams. This work focuses on the image reconstruction method, which corrects the pincushion distortion inherent to the square-shaped resistive anode, and investigates the influence of the magnetic field on the detector performance. Our results demonstrate that the detector achieves beam profile measurements with sub-millimeter accuracy, while coping with the spatial and high-magnetic field (4 T) constraints of the experiment. These capabilities meet the precision requirements of the WISArD experiment for extracting the modified beta-neutrino angular correlation coefficient, ã$_{βν}$, with an uncertainty of 0.1%.
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Submitted 13 February, 2026;
originally announced February 2026.
Status on the DESIR High Resolution Separator Commissioning
Authors:
J. Michaud,
P. Alfaurt,
A. Balana,
B. Blank,
L. Daudin,
T. Kurtukian Nieto,
B. Lachacinski,
L. Serani,
F. Varenne
Abstract:
Many nuclear reactions used to create radioactive isotopes for nuclear research produce, in addition to the isotope of interest, many contaminants, which are often produced in much larger amounts than the isotope of interest. Many installations using the ISOL approach are therefore equipped with high-resolution mass separators to remove at least isotopes with a different mass number. In the presen…
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Many nuclear reactions used to create radioactive isotopes for nuclear research produce, in addition to the isotope of interest, many contaminants, which are often produced in much larger amounts than the isotope of interest. Many installations using the ISOL approach are therefore equipped with high-resolution mass separators to remove at least isotopes with a different mass number. In the present paper, we present the results of the commissioning of the DESIR HRS presently under development at LP2I Bordeaux (formerly CENBG). Optical aberrations are corrected up to 3rd order and a mass resolution of M/$Δ$M of 25000 is reached with a transmission of about 70% for a 133Cs+ beam at 25 keV.
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Submitted 21 March, 2022;
originally announced March 2022.