Non cylindrical symmetric Shocks in liquid jetsmcdonald/mumu/...15th March 2005 J. Lettry CERN, E....
Transcript of Non cylindrical symmetric Shocks in liquid jetsmcdonald/mumu/...15th March 2005 J. Lettry CERN, E....
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15th March 2005 J. Lettry CERN, E. Robert EPFL 1
Non cylindrical symmetric Shocks in liquid jets
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15th March 2005 J. Lettry CERN, E. Robert EPFL 2
TT2A-scheme
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15th March 2005 J. Lettry CERN, E. Robert EPFL 3
TT2a experiment
-5
0
5
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Hg jet velocity 12 m/sdiameter 10 mm
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15th March 2005 J. Lettry CERN, E. Robert EPFL 4
Laser setupDipl. E. Robert EPFL
Visualisation setup
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15th March 2005 J. Lettry CERN, E. Robert EPFL 5
Laser induced cavitation bubbles in a laminar water jet
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15th March 2005 J. Lettry CERN, E. Robert EPFL 6
Symetric and Asymmetric bubble collapse
(Film to slide under preparation 15/3/05)
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15th March 2005 J. Lettry CERN, E. Robert EPFL 7
Water jet ripples generated by a 8 mJ Laser cavitation bubble
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15th March 2005 J. Lettry CERN, E. Robert EPFL 8
R. Samulyak
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15th March 2005 J. Lettry CERN, E. Robert EPFL 9
Conclusion TT2a
• Hadronic cascade simulation for a realistic irradiation geometry is mandatory to our understanding of the results
• We expect non symmetric irradiation therefore micro jets …
• Timing of the images is a critical parameter that deserves a preliminary test.
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15th March 2005 J. Lettry CERN, E. Robert EPFL 10
Target• Evolution of material parameters under fatigue
and irradiation via laser vibrometry monitoring of vibration eigenfrequencies (R. Wilfinger, EURISOL-DS task )
• Test of the stability of a High temperature Ta-cylinder under pulsed irradiation
• Test of a Ta-beed target• Tests of the effects of very short (250 to 30 ns)
proton bunches for molten and solid targets
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15th March 2005 J. Lettry CERN, E. Robert EPFL 11
Horn
• Test of the Horn at nominal parameters (current and pulse duration). Dedicated power supply required for single pulses and 50Hz operation (the Nominal 50Hz power supply is worth 800 k€).
• Measurement at low repetition rate of π yields and momentum distributions for various targets assemblies (solid, liquid, beeds) inserted in the “available” horn.
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15th March 2005 J. Lettry CERN, E. Robert EPFL 12
Conclusion targetry R&D
• The most missing infrastructure required to continue this R& D effort is a dedicated experimental area capable of delivering 2 to 24 GeV proton pulses and designed to face the various safety aspects (Chemistry of heavy metals, high radiation levels, High voltage, high current …).