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HiRadMat Proposal HRMT-22: Tungsten Powder Target Experiment (A follow-up to the HRMT-10 ‘W-Thimble’ Experiment in 2012) Chris Densham, Otto Caretta, Tristan Davenne, Mike Fitton , Peter Loveridge, Joe O’Dell (RAL) Ilias Efthymiopoulos, Nikolaos Charitonidis (CERN).
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Tungsten Powder Target Experiment
(A follow-up to the HRMT-10 ‘W-Thimble’ Experiment in 2012)
Chris Densham, Otto Caretta, Tristan Davenne, Mike Fitton, Peter Loveridge, Joe O’Dell(RAL)
Ilias Efthymiopoulos, Nikolaos Charitonidis
Open trough Assembly
Tungsten powder response to a 440 GeVproton beam pulse at HiRadMat
HRMT-10: Open Questions
Top window to view sample disruption
Lighting re-configured to allow a view of the full trough length
High Speed Camera
Horizontal linear stage to switch between samples
1. Test in both vacuum and helium environments
If we see an eruption in vacuum then it cannot be due to an aerodynamic mechanism.
Elongated beam windows to facilitate hitting multiple samples. Extra optical window in the lid permits a view of the disrupted sample from above.
multiple samples, stiff (high natural frequency), thermally linked to vessel.
4. Use mono-dispersed spherical tungsten powder
To facilitate better correlation of results with analytical / theoretical pressure drop and drag models.
5. View along the full length of the trough
To allow better correlation of lift vs energy deposition as the shower builds up along the sample
30 cm long sample
6. Reconfigure the lighting rig
More intensive lighting to permit a faster camera frame rate
Energy deposited in a tungsten powder samplefrom FLUKA simulation
Vary the Beam Posn.
Vary intensity and monitor container wall with LDV
Allow for a total budget of up to 1e13 protons (a few extra shots?)
Inner Container (Al)container
Powder Sample (W)
Outer Container (Al)
Beam Window (Ti alloy)
Maximum dose rate on the sample: 3.7 Sv/h
Maximum dose rate on the sample: 103 mSv/h
Maximum dose rate on the sample : 9 mSv/h
Maximum dose rate on the sample : 925 μSv/h
Maximum dose rate on the sample : 476 μSv/h
Maximum dose rate on the sample : 241 μSv/h
Inner containment vessel rated for 2 bar internal pressure
As a result of convection between gas and hot powder the gas temperature and pressure in the sample holder can increase
Peak pressure and temperature depend on cooled surface area of container