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Paul Scherrer Institut

Paul Scherrer Institut . G4RMC status. Laurent Desorgher. Study of problem of convergence for Jupiter like spectrum (Juice mission) Implementation of gamma splitting to improve convergence for some simulation case Migration of Reverse MC to MT. Outline. 2. Convergence test.

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Paul Scherrer Institut

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  1. Paul Scherrer Institut G4RMC status Laurent Desorgher

  2. Study of problem of convergence for Jupiter like spectrum (Juice mission) • Implementation of gamma splitting to improve convergence for some simulation case • Migration of Reverse MC to MT Outline 2

  3. Convergence test • Test description • Primary Jupiter electron spectrum • Dose behind thick shielding of Aluminum or Tantalum • Test with or without some reverse processes • Look at convergence of the results Problem of convergence in some cases • Dose peak can slow done drastically the convergence of the results Convergence can be improved by • Switching off the reverse Compton and photo electric reactions • Splitting of forward gamma on the adjoint source • Reason for this disrcepancy under study

  4. Example Convergence Ta 2mm housing • 50 simulations • No gamma splitting fsplit=1 • Gamma splitting fsplit =10 • Splitting of gamma remove a lot of dose peak and increase therefore the convergence • 10-15% Lower dose compared to forward • Reason for this disrcepancy under study Fwd dose

  5. Ongoing Migration to MT mode • Migration to MT implies important changes in the Reverse MC • Forward and backward trackings are now handled in the same event in order to be treated by the same worker • New class G4MTAdjointRunManager to control the adjoint simulation from the master side • New class G4AdjointUserActionInitialization • Replace the UserActionInitialization • In Build and BuildForMaster call the Build and BuildForMaster methods of UserActionInitialization • Status of development: • Main code developed • ReverseMC compiled in non MT mode is working as before • Test of the ReverseMC in MT mode block at some barrier->still need to figure out why • Reason for this disrcepancy under study

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