TY - JOUR
T1 - Positive-ion accelerator mass spectrometry at ATLAS
T2 - Peaks and pits
AU - Paul, Michael
AU - Pardo, Richard C.
AU - Collon, Philippe
AU - Kutschera, Walter
AU - Rehm, K. Ernst
AU - Scott, Robert
AU - Vondrasek, Richard C.
N1 - Publisher Copyright:
© 2019
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Electron Cyclotron Resonance (ECR) ion sources and the production of multiple-charge positive ions with high efficiency in combination with a heavy-ion accelerator have opened the way to an alternative and complementary version of accelerator mass spectrometry (AMS). A notable strength of positive-ion over traditional AMS is the capability of ultra-high sensitivity detection of radioactive isotopes of noble gases, in particular 37Ar (t1/2 = 35 d) and 39Ar (269 y). The complete dissociation of molecular ions in the ECR and in particular of hydride ions of neighboring stable isotopes results in superior isotopic separation. However, the use of high charge states, necessary for acceleration to high energy, entails the existence of severe transmission degeneracies with stable ions having nearly equal mass-to-charge ratios, in addition to that of stable isobaric ions. Separation or discrimination of these parasitic ions require powerful and sophisticated dispersive systems at detection stage. We review here work performed and in progress at the ATLAS facility of Argonne National Laboratory (ANL) where an ECR ion source, a Radio-Frequency Quadrupole (RFQ), a superconducting linear accelerator and a Gas-Filled Magnet (GFM) are used as an AMS setup.
AB - Electron Cyclotron Resonance (ECR) ion sources and the production of multiple-charge positive ions with high efficiency in combination with a heavy-ion accelerator have opened the way to an alternative and complementary version of accelerator mass spectrometry (AMS). A notable strength of positive-ion over traditional AMS is the capability of ultra-high sensitivity detection of radioactive isotopes of noble gases, in particular 37Ar (t1/2 = 35 d) and 39Ar (269 y). The complete dissociation of molecular ions in the ECR and in particular of hydride ions of neighboring stable isotopes results in superior isotopic separation. However, the use of high charge states, necessary for acceleration to high energy, entails the existence of severe transmission degeneracies with stable ions having nearly equal mass-to-charge ratios, in addition to that of stable isobaric ions. Separation or discrimination of these parasitic ions require powerful and sophisticated dispersive systems at detection stage. We review here work performed and in progress at the ATLAS facility of Argonne National Laboratory (ANL) where an ECR ion source, a Radio-Frequency Quadrupole (RFQ), a superconducting linear accelerator and a Gas-Filled Magnet (GFM) are used as an AMS setup.
KW - Accelerator mass spectroscopy
KW - ECR ion source
KW - Gas-filled magnet
KW - Noble-gas radionuclides
KW - Superconducting linear accelerator
UR - http://www.scopus.com/inward/record.url?scp=85064462271&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2019.04.003
DO - 10.1016/j.nimb.2019.04.003
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AN - SCOPUS:85064462271
SN - 0168-583X
VL - 456
SP - 222
EP - 229
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
ER -