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SUMMARY:Developing a laser ionization test bench for radioactive beams
DTSTART;VALUE=DATE-TIME:20110714T150000Z
DTEND;VALUE=DATE-TIME:20110714T170000Z
DTSTAMP;VALUE=DATE-TIME:20260711T203621Z
UID:indico-contribution-5235@events.saip.org.za
DESCRIPTION:Speakers: Lucky Makhathini (University of Zululand\, stellenbo
 sch and iThemba labs)\nNuclear reactions employed in the production of neu
 tron-rich radioactive beams often produce many species simultaneously.  To
  extract these beams\, they must not only be ionized\, but ionized selecti
 vely\, so that only the desired species is extracted.\nWe are developing t
 he laser resonant ionization technique to fulfil these requirements. The m
 ethod makes use of high power pulsed lasers\, making it possible to assume
  that the ionization probability of atoms entering the laser beam zone wil
 l be close to 100%. A test setup-is being developed to ionize stable atoms
 . In our test bench\, a stream of atoms is produced by evaporation. Atoms 
 in the stream are ionized by lasers and transported to an ion detector wit
 h the assistance of an electric field. Ionization can be either non-resona
 nt through a continuum of levels or resonant through excitation of an auto
 -ionizing state. For efficient atom ionization the transition must be satu
 rated at all excitation stages. The condition of saturation means 100% pro
 bability of excitation of all atoms in the laser radiation zone in the tim
 e shorter than the life time of the level being excited. \nThe lasers that
  are employed are the excimer laser and dye laser. The excimer laser is us
 ed to pump the dye laser and the dye laser is used to tune the wavelength.
  Instruments such as Fabry-Perot interferometers and diffraction gratings 
 are used to select the wavelength required. The laser beam for ionization 
 is directed to the chamber by means of mirrors and lenses.\nSeparation of 
 ion makes it possible to obtain individual spectra of each ion without the
  use of mass separator.\n\nhttps://events.saip.org.za/event/7/contribution
 s/5235/
LOCATION: Asteria
URL:https://events.saip.org.za/event/7/contributions/5235/
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