-1-UPHUK-3, 17-19 September 2007, Bodrum Turkey

Ercan Pilicer, Ilhan Tapan, Nilgun Demir

Uludag UnivesityPhysics Department

Bursa-Turkey

A RADIATION SHIELDING SIMULATION FOR BESSY FEL e- DUMP SYSTEM

-2-UPHUK-3, 17-19 September 2007, Bodrum Turkey

BESSY FEL

e- dump system

Radiation environment

FLUKA (A Multi-particle Transport Code)

e- dump simulation

Future works

Remarks & Conclusions

ContentsUYEF

-3-UPHUK-3, 17-19 September 2007, Bodrum Turkey

BESSY FEL

Synchrotron ring

BESSY FEL

UYEF

1.7 GeV e- energy, 240 m circumference

-4-UPHUK-3, 17-19 September 2007, Bodrum Turkey

BESSY FEL

Electron and photon energies

UYEF

-5-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump system

BESSY FEL e- dump layout

UYEF

-6-UPHUK-3, 17-19 September 2007, Bodrum Turkey

Radiation environment

Different products resulting from electron-nucleus interactions;

Gamma raysby high energy electron hitting on vacuum system component or colliding with the residual gas nuclei

Neutronsby photons from bremsstrahlung or from EM cascade in nucleus interaction

Protonsby nuclear interactions, but small in range when compared to neutrons

Muonsby pair production from photons having a starting energy of 212 MeV

UYEF

-7-UPHUK-3, 17-19 September 2007, Bodrum Turkey

FLUKA (A Multi-particle Transport Code)

FLUKA is a general purpose tool for calculations of particle transport and interactions with matter, covering an extended range of applications;Proton and electron accelerator shielding, target design, calorimetry, activation, dosimetry, detector design, Accelerator Driven Systems, cosmic rays, neutrino physics, radiotherapy etc.

In general no programming is required except in the case of special user requirements via user routines written in Fortran77

UYEF

Free to download from www.fluka.org

-8-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulation

Construct geometryin 3 ways;

SimpleGEO(3D viewer)

ALIFE(2D viewer)

FlukaGUI(2D viewer)

UYEF

-9-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulation

Some physical processes included;

By default (SHIELDIN) but can be overwrittenEM interactions (EMF)Photo-nuclear interactions (PHOTONUC)Particle threshold (PART-THR)Low energy neutrons (LOW-NEUT)

Output and scoring by;

SCORE (ALL-PART, PHOTON, ENERGY, EM-ENRGY)USERWEIG (conversion factors)USRBIN (fluence & energy deposition)USERDUMP (define a collision tape)USRICALL (user dependent initialisation)

UYEF

-10-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulation

Gamma dose rate in Sv/h for 40 MeV e- @ 2 mA

UYEF

-11-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulation

Neutron dose rate in Sv/h for 40 MeV e- @ 2 mA

UYEF

-12-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulationUYEF

By modifying some user routines, coordinates for boundary crossing particles in the barrel body

gammas neutrons

-13-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulation

Ekin for leaking particles from barrel body

UYEF

gammas neutrons

-14-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulationUYEF

-15-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulationUYEF

-16-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulationUYEF

-17-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulationUYEF

-18-UPHUK-3, 17-19 September 2007, Bodrum Turkey

e- dump simulationUYEF

-19-UPHUK-3, 17-19 September 2007, Bodrum Turkey

Future works

More realistic geometry&

Any shielding&

G4 comparision

UYEF

-20-UPHUK-3, 17-19 September 2007, Bodrum Turkey

Remarks & Conclusions

e- should be stopped

First steps to understand radiation safety issues

BESSY FEL e- dump system adopted to TAC IR FEL

Simulation work for gammas & neutrons doses, fluences, Ekin

Thank to Dr. Klaus Ott (@ BESSY) for his contribution

UYEF

-21-UPHUK-3, 17-19 September 2007, Bodrum Turkey

Thank you for your attention...

News from simulation technologies...