Mercury Beam Dump Simulations Tristan Davenne Ottone Caretta STFC Rutherford Appleton Laboratory, UK 2 nd Princeton-Oxford High Power Target Meeting 6-7.

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Presentation transcript:

Mercury Beam Dump Simulations Tristan Davenne Ottone Caretta STFC Rutherford Appleton Laboratory, UK 2 nd Princeton-Oxford High Power Target Meeting 6-7 November-2008

Mercury beam dump design from NUFACT Feasibility Study

Peter Loveridge, November-2008 Mercury beam dump design from NUFACT Feasibility Study

Thermal shocks and magnetohydrodynamics in high power mercury jet targets J Lettry, A Fabich, S Gilardoni, M Benedikt, M Farhat and E Robert

Fluka Simulation - Energy deposition in mercury pool with 24GeV beam How much of the beam energy is absorbed in the beam dump?

Agitation ‘eruption’ of mercury pool surface due to 24GeV proton beam Autodyne simulation Splash following pulse of 20Terra protons

Damage to underside of stainless steel plate fluid - structure interaction maybe sprung baffles would be help reduce damage

Damage as a result of high speed impact of a mercury droplet Stainless Steel vs. Ti-6Al-4V

Consider helium bubbles in beam dump reduce splash velocity helium Proton beam

Mercury beam dump design from NUFACT Feasibility Study

Agitation of mercury pool surface due to impinging mercury jet 2 phase CFX model mercury jet velocity = 20m/s Angle of attack = 5.7° mercury pool surface area = 0.05m 2

Summary Conclusions Simulations indicate that mercury splashes with a maximum velocity of 75m/s will result when a pulse from the undisrupted 24GeV beam is absorbed by the mercury beam dump. A 3mm diameter mercury droplet impacting a stainless steel plate at 75m/s is predicted to cause significant damage. Ti-6Al-4V is predicted to be more resistant to damage due to higher ultimate strength and shear strength. Significant agitation of the mercury surface also results from the entry of the mercury jet. 6/27/2015

Addendum: 12 Nov 08 Autodyne simulation of the momentum in an Hg drop that hits a steel plate at t = 1.3 ms. Momentum drops linearly with time during the splash Area of contact is very small at beginning of splash, so high initial impact pressure.