1. CATANIA Feb 28th - Mar 1st 2011 F. Borsa (INAF - Osservatorio Astronomico di Brera) M. Ghigo (INAF - Osservatorio Astronomico di Brera)

2. TOU Model in Geant4 Catania, Feb28-Mar1 2011F. Borsa- INAF OABrera Simulation with the use of Geant4  All the lenses in BK7  Tube: 2.5mm AlBeMet  Back shield: Pb

3. Radiation model from SPENVIS  1 year fluence (2015) of solar protons at solar maximum at 1.01 AU Catania, Feb28-Mar1 2011F. Borsa- INAF OABrera  Model agrees with simple geometry test TEST: sphere of Al 3mm  Underestimating high energies? Expected 3.5krad -> Obtained 3.2krad

4. Radiation simulated Catania, Feb28-Mar1 2011F. Borsa- INAF OABrera  Almost 10^13 p+/cm^2: time consuming!  Sphere surface with isotropic radiation: 1m radius  Simulated 1 event on 10^8  Range: 0.1 – 500 MeV Vacuum P+

5. Radiation: results Catania, Feb28-Mar1 2011F. Borsa- INAF OABrera Rad window2916.48 L11097.91 L22053.49 L31663.32 L41690.53 L52081.24 L61219.27 Rad window2927.381344 L11035.133289 L21936.760758 L31619.565431 L41628.043796 L52001.314072 L61117.285043 AlBeMetAl  The energy reaching each lens is measurable  AlBeMet vs Al

6. Next steps Conclusion  The model created with Geant4 reproduces results comparable to preliminary analysis made on SPENVIS, and can simulate the radiation received by each lens Next steps  Modeling the mechanical part (tube, baffle, back shield, …)  Improving the fit for the proton spectrum  Modeling real materials for all lenses  Increasing statistics Catania, Feb28-Mar1 2011F. Borsa- INAF OABrera