ps isolde 1

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
Proton beam
Robots
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 lt230 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 bombardment 2.
  Ionization 3. Acceleration 4. 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 (gt
velocity of 4105 - 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 31013 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.