1. Estimation of temperature increase in the dump through Monte – Carlo simulations and rough calculations N. Charitonidis (EN/MEF)

2. Simulation Setup The geometry of the HiRadMat dump was used for this set of simulations Main dump Iron Blocks Dump entry block

3. Simulation Setup The effect of possible temperature increase of the collimator, after the irradiation of a possible target was studied. For this purpose, a “scaterrer” was placed in front of the block, in a way that the beam interacts with him. The energy deposition on the entry block, as well as the surrounding area was scored using the FLUKA m-c code.

4. Temperature Calculation A rough calculation of the temperature change was done using the basic formula: The energy deposition (dE/dV) [GeV/cm 3 ] of the particles given by the FLUKA code, will be used in order to calculate the temperature increase (several hotspots) in the dump collimator

5. Case studies The entry block constructed from iron, with a carbon scaterrer in front of him. The entry block, constructed from aluminum, with the carbon scaterrer in front of him The entry block, constructed from iron, was simulated to have reduced dimensions (120mm less in the beam direction), with the carbon scaterrer The entry block, constructed from Stainless Steel (316L), was simulated to have reduced dimensions (120mm less in the beam direction), with the carbon scaterrer

6. The dump entry block Without the proposed reducal The “scatterer” 4 meters from the dump

7. Results Nothing (as expected) without the “target” IRON

8. Results Significant temperature increase with the carbon scatterer ! ~0.1 degree / bunch ! IRON

9. 3D-Visualisation At a distance of ~ 10-12 cm from the entrance of the collimator we have (the maximum increase) IRON Maximum Increase

10. Aluminum dumpcol ALUMINUM 0.01 – 0.05 degrees / bunch

11. Aluminum dumpcol ALUMINUM

12. Stainless Steel (316L)

13. Reduce of the collimator Same tests performed with the block reduced by 120mm

14. Temperature increase The hotspots are respectively “shifted” due to the dimensions’ resize

15. A disaster scenario What is going to happen in terms of temperature increase if the beam accidentally hits the block ? IRON 10deg/bunch inrease! M.P: 1530 ο C

16. A disaster scenario #2 Aluminum 1deg/bunch inrease! M.P: 659 ο C

17. Conclusions Cooling should be implemented in the collimator, in order to prevent so the heating due to the targets, and also the disaster scenarios. If Aluminum is chosen to be the material of the block, the low melting point (659 o C) should be seriously taken into consideration, especially in case of accidental misplacement

18. Thank you !