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March 18, 2008

March 18, 2008. Optical Diagnostic Results of MERIT Experiment at CERN HeeJin Park. Total 360 of beam shots performed. Images for 260 beam shots collected. MERIT beam shot summary website, http://www.hep.princeton.edu/~mcdonald/mumu/target/hkirk/MERIT_Beam_Program_110607.pdf.

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March 18, 2008

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  1. March 18, 2008 Optical Diagnostic Results of MERIT Experiment at CERN HeeJin Park

  2. Total 360 of beam shots performed. Images for 260 beam shots collected. MERIT beam shot summary website, http://www.hep.princeton.edu/~mcdonald/mumu/target/hkirk/MERIT_Beam_Program_110607.pdf Optics Configuration with respect to Beam Z=0

  3. Observation : Interaction of Hg Jet with 14 GeV Beam, Movie 5T, 16TP 10T, 12TP 0T, 8TP 0T, 4TP 10T, 20TP 5T, 16TP

  4. Cavitation Example 1 5T, 16TP, 14GeV Cavitation Center

  5. Beam/Jet Interaction Example 2 (1) 5T, 16TP, 14GeV to be continued at next page

  6. Beam/Jet Interaction Example 2 (2) Cavitation Center to be continued at next page

  7. Beam/Jet Interaction Example 2 (3)

  8. Observation : Velocity of Splash with Interaction of 24GeV Beam 3.8TP, 10T V = 24 m/s t=0.375 ms t=0.175 ms t=0 t=0.150 ms 6TP, 5T V = 47 m/s t=0.375 ms t=0.050 ms t=0.175 ms t=0

  9. Observation : Velocity of Splash with Interaction of 24GeV Beam 10TP, 10T V = 54 m/s t=0.375 ms t=0.175 ms t=0 t=0.075 ms 20TP, 10T V = 65 m/s t=0.375 ms t=0.050 ms t=0.175 ms t=0

  10. Observation : Hg Jet Movement In Magnetic Field, V=15m/s 5T 0.4T 10T 15T

  11. TIF Image Processing For Analysis

  12. Hg Jet Width Along The Magnet Axis, V=15m/s

  13. Hg Jet Angle Measurement, V=15m/s

  14. Hg Jet Surface Fluctuations, V=15m/s

  15. Hg Jet Velocity In Magnetic Field

  16. Threshold Scan, 14GeV Program

  17. Intensity Scan, 14GeV Program

  18. Intensity Scan, 24GeV Program

  19. Intensity Scan, 14GeV vs 24GeV Beam

  20. Conclusions • It is observed that the splash begins at the bottom of jet and ends at the • top of jet, which seems to be consistent with the beam trajectory. The • breakup is consistent with the beam trajectory and could be the by-product • of cavitation caused by the energy deposition of the proton beam. • The break up of the Hg jet is influenced by the magnetic field. • The splash velocity increases as the beam intensity increases, • however, magnetic field reduces the effect. • The Hg jet disruption length is suppressed by magnetic field. • The 24GeV proton beam results in a longer disruption length than the • 14GeV proton beam. The intensity threshold for the 24GeV beam is • lower than the 14GeV beam.

  21. Conclusions • 4. The magnetic field stabilizes the Hg jet flow. The fluctuations on the jet surface decreases as the magnetic field increases. • 5. The jet size increases as it moves to downstream and it was same up to 10T but increases at 15T. The jet size at 10T was smaller than that for a 15T field, which might have varied between the major and minor axis of an elliptical core. • The longitudinal Hg jet velocity was not affected by the magnetic field.

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