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PS-ISOLDE

PS-ISOLDE. REX-ISOLDE makes use of the availability of ~70 elements (600 isotopes) from the online mass separator at the PS-ISOLDE. Hot cell. Robots. Proton beam. GPS target. Robot control. Control room. HRS target. HRS separator. GPS separator. REX-ISOLDE. Experimental area.

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PS-ISOLDE

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  1. PS-ISOLDE REX-ISOLDE makes use of the availability of ~70 elements (600 isotopes) from the online mass separator at the PS-ISOLDE. Hot cell Robots Proton beam GPS target Robot control Control room HRS target HRS separator GPS separator REX-ISOLDE Experimental area Beam lines • PS-ISOLDE data • Energy = 60 keV • Number of elements  70 Number of isotopes  600 • General Purpose Separator m/m resolution = 1/2400 • High Resolution Separator m/m resolution ~ 1/10000 • Typical targetsmetal foils: Ti, Nb, Tamolten metals: Sn, La, Pboxide: Mg, Al, Ca, Srcarbide: Si, Th, U • thickness: <230 g/cm2 • These elements are created with an Isotope Separator On Line (ISOL) technique. The 1+ ion production at PS-ISOLDE can be divided into four steps:1. Proton bombardment2. Ionization3. Acceleration4. Mass selection

  2. PS-ISOLDE 2. Ionization The nuclides diffuse out of the heated target (~2000°) - release times between ms and minutes - into an ionizer (surface, plasma or laser ionizer). In the ion source the atoms are ionized to mainly 1+ charge state. 3. Acceleration The 1+ ions are extracted from the ionizer and accelerated to 60 keV (=> velocity of 4·105 - 2 ·106 m/s). The isotope yield varies between 109 to a few ions per second from the valley of stability to the dripline. 4. Mass selection In the primary target a wide variety of elements are created - desired and undesired. In a magnetic analyzer, the GPS or HRS, the mixed beam is separated into isobaric or monoisotopic beams, respectively. 1. Proton bombardment From the PS Booster a pulse of 3·1013 protons (1 GeV) hits a thick primary target every 1.2 seconds. This intense bombardment produce radioactive nuclides in spallation, fission or fragmentation reactions. After the magnet analyzer the beam goes either to the already existing ISOLDE experiments or to the new REX-ISOLDE for an energy boost to 0.8 - 2.2 MeV/u. The total time from primary target release to secondary target impact varies between 10 and 40 ms which allows reasonable yield for nuclei with half-lives down to 10 ms.

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