Abstract
The ATLAS facility is being augmented with two new separators in order to take full advantage of recent and future anticipated beam intensity upgrades to the accelerator. A novel concept is used for the Argonne Gas-Filled Analyzer (AGFA), which employs only two magnetic elements; a quadrupole singlet for vertical focusing and a multipole magnet that provides a dipole field for the separation and a quadrupole field for horizontal focusing of the reaction products. The design allows for placing Gammasphere or GRETINA at the target position. This arrangement enables studies of prompt gamma-ray emission from weakly populated trans-fermium nuclei and those near the doubly-magic N=Z=50 shell closures measured in coincidence with the recoils registered in the AGFA focal plane. The Argonne In-flight Radioactive Ion Separator (AIRIS) is a magnetic chicane that will be installed immediately downstream of the last ATLAS cryostat. It will be used to separate radioactive ion beams generated in flight by the primary beam at an upstream high-intensity production target. These beams will be further purified by a downstream RF sweeper and transported to a number of target stations including HELIOS, the Enge spectrograph, the FMA and Gammasphere.
Highlights
With the recent accelerator upgrades at ATLAS, which were achieved by replacing several cryostats with the original split-ring resonators with modern quarter-wave resonators, it is possible to accelerate high-intensity beams of stable heavy ions
We have developed a novel design for a gasfilled separator, the Argonne Gas-Filled Analyzer, AGFA, to separate and study the structure of transuranic nuclei that can be produced in heavy-ion fusion reactions, but only with small cross sections
We have for two decades carried out a successful research program with light, radioactive beams produced in flight using various light charged-particle reactions, such as (d,p), (d,n), (p,n) etc., in inverse kinematics by focusing the primary, stable heavy-ion beam onto a production gas cell containing hydrogen or deuterium gas
Summary
With the recent accelerator upgrades at ATLAS, which were achieved by replacing several cryostats with the original split-ring resonators with modern quarter-wave resonators, it is possible to accelerate high-intensity beams of stable heavy ions. We have developed a novel design for a gasfilled separator, the Argonne Gas-Filled Analyzer, AGFA, to separate and study the structure of transuranic nuclei that can be produced in heavy-ion fusion reactions, but only with small cross sections. This endeavor requires both intense heavy-ion beams and efficient collection of the reaction products at the focal plane of the separator in order to characterize their decay properties. Photograph of the AGFA magnets at ATLAS taken during the vacuum test of the D vacuum chamber seal
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