TUXAA01
ANL, Lemont, Illinois, USA
The new Radioactive Ion Separator (RAISOR), formerly Argonne In-flight Radioactive Ion Separator (AIRIS), was recently installed and commissioned at the Argonne Tandem Linear Accelerator System (ATLAS). RAISOR is a chicane of four dipoles with four complementary quadrupoles, and will enable the selection of secondary radioactive ion beams produced via the in-flight method. RAISOR will expand the scope of the in-flight beam program at ATLAS by improving beam purity, increasing the allowable primary beam intensity, and enabling secondary beam delivery to all ATLAS high energy target stations. Along with the magnets, new diagnostics and high power slits were installed to identify low intensity secondary beams and safely dump the high intensity primary beam, respectively. Commissioning results and the expected performance of the full system will be presented.
TUZCA01
ANL, Lemont, Illinois, USA
An Electron Beam Ion Source (EBIS) charge breeder is in operation at Argonne National Laboratory as part of the CAlifornium Rare Ion Breeder Upgrade (CARIBU). The EBIS replaced the ECR charge breeder in 2016, was commissioned on-line in 2017, and delivery of radioactive beams for the ATLAS physics program began in 2018. The source has produced stable and radioactive beams with A/Q <6, breeding times <30 ms, and charge breeding efficiencies >18% into a single charge state. The source has also demonstrated a substantial reduction in beam contamination levels when compared to the ECR charge breeder, with the radioactive species accounting for >80% of the beam incident on target, whereas with the ECR the fraction was <3%. The dynamics of charge bred ion extraction from the trapping region have been investigated as well as methods to lengthen the extracted beam pulse.
WEYAA02
ANL, Lemont, Illinois, USA
The recently approved multi-user upgrade [1] of the superconducting linac, ATLAS, will enable simultaneous acceleration and delivery of two ion beams to different experimental areas. In the initial phase, one stable, nearly continuous wave, beam from the ECR ion source and one pulsed radioactive beam from the EBIS charge breeder ion source of the Californium Rare Isotope Beam Upgrade (CARIBU-EBIS) will be interleaved in time via an electrostatic deflector at injection, and accelerated through the first two sections of the linac. At that point, one of the beams is deflected via a fast switching magnet to a lower energy experimental area while the other is further accelerated through the third linac stage of ATLAS. Details of the proposed implementation and the expected gains from this upgrade will be presented. In addition to enhancing the nuclear physics program, this upgrade will allow some applications such as material irradiation, isotope production, and radiobiology [2].
* ’Simultaneous Acceleration of Radioactive and Stable Beams in the ATLAS Linac’, B. Mustapha et al, HB-2014.
** ’The ATLAS Multi-User Upgrade and Potential Applications’, JINST 12 (2017) T12002.