[Triumf-seminars] TRIUMF Accelerator Seminar today at 14:00

[TRIUMF Seminars]

Date/Time: Wed 2012-10-17 at 14:00

Location:  ISAC II Conf. Rm.   

Speaker:   Nikita Bernier and Aurelia Laxdal (TRIUMF)

Title:     "FLUKA Study of Photo-Production of 8Li for Beta-NMR Material" and "TWO-STEP METHOD FOR SHIELDING DESIGN"

Abstract: 1. "FLUKA Study of Photo-Production of 8Li for Beta-NMR Material" 
               
                 Nikita Bernier

TRIUMF laboratory is constructing a 50 MeV, 10 mA superconducting electron linear 
accelerator as part of its future Advanced Rare IsotopE Laboratory (ARIEL) project. 
The electrons will be used to produce radioactive beams via electron-driven photo 
disintegration of 9Be. The photons necessary for the photo-fission are produced by
braking radiation when the electrons pass through a heavy metal converter, such as 
Tantalum or Tungsten. The current FLUKA project consists in the study of photo-production
of 8Li through the reaction 9Be(γ,p)8Li. This requires the photonuclear interactions
to be activated for the simulation. Detailed transport of electrons and photons is
also required. We are interested in scoring the energy deposition in the target and
the production rate of rare isotopes. Also of interest is the equivalent dose outside
the target chamber from the residual activation after end of bombardement. The 9Be160
production target is modeled from specifications of the Institut de Physique Nucléaire Orsay, 
without a converter, where the preliminary tests will take place later this year.


2. "TWO-STEP METHOD FOR SHIELDING DESIGN"
        
               Aurelia Laxdal

TRIUMF's ARIEL project includes two new radioactive production target stations.
The east target station will be dedicated to production from a 0.5 MW electron
beam at 50 MeV and the west target station will be driven by protons from the
500 MeV cyclotron. FLUKA shielding simulations are done for the proton target
station and the adjacent personnel occupational areas, when a 500 MeV p+ beam at
100 uA impinges onto a uranium carbide target. Since the laser port, aligned
directly with the target, extends into the mechanical service room, a maze-type
shielding is designed around the laser table, to create a personnel accessible
area into the mass separator room during beam production. In this case a
two-step method approach is suitable to optimize and finalize the shielding
configuration. In the first step hadrons are scored in an output file, with
USERDUMP, and read in as a SOURCE file in the second step. A description of the
two-step method, its files' manipulation and the required cards, will be given
in this presentation.





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