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Pepperpot Emittance Calculations

Pepperpot Emittance Calculations. Simon Jolly Imperial College 29 th August 2007. Pepperpot Emittance Measurement. As with Slit-Slit scanner, pepperpot emittance measurement is sensitive to cut level.

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Pepperpot Emittance Calculations

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  1. Pepperpot Emittance Calculations Simon Jolly Imperial College 29th August 2007

  2. Pepperpot Emittance Measurement • As with Slit-Slit scanner, pepperpot emittance measurement is sensitive to cut level. • Have to impose some sort of cut due to inherent 100 count noise from camera and background noise. • Scintillator degrades over time: can we specify cut level and scintillator lifetime to give consistent emittance measurement? Simon Jolly, Imperial College

  3. Pepperpot vs. Slit-Slit: 11kV X Emittance 0.71 p mm mrad Simon Jolly, Imperial College

  4. Pepperpot vs. Slit-Slit: 11kV Y Emittance 1.07 p mm mrad Simon Jolly, Imperial College

  5. Pepperpot vs. Slit-Slit Pre-Conclusions • Shape and distribution broadly the same, but much broader for pepperpot measurement. • Emittance values higher for pepperpot single pixel measurement compared to slit-slit. • Current cut is 119 counts: can we improve shape/emittance values with improved cut? Simon Jolly, Imperial College

  6. 5/7/07 1454 Image, Light Intensity Simon Jolly, Imperial College

  7. 5/7/07 1454 Image, Emittance Variation Simon Jolly, Imperial College

  8. 5/7/07 1525 Image, Emittance Variation Simon Jolly, Imperial College

  9. 6/7/07 All Images, Light Intensity Simon Jolly, Imperial College

  10. 6/7/07 All Images, Average Spot Emittance Simon Jolly, Imperial College

  11. 6/7/07 All Images, Single Pixel Emittance Simon Jolly, Imperial College

  12. Pepperpot 11kV: 119/250 Cut 119 cut 250 cut Simon Jolly, Imperial College

  13. Pepperpot vs. Slit-Slit: 11kV X Emittance 0.71 p mm mrad Simon Jolly, Imperial College

  14. Pepperpot vs. Slit-Slit: 11kV X Emit, 250 Cut 0.39 p mm mrad Simon Jolly, Imperial College

  15. Pepperpot vs. Slit-Slit: 11kV Y Emittance 1.07 p mm mrad Simon Jolly, Imperial College

  16. Pepperpot vs. Slit-Slit: 11kV Y Emit, 250 Cut 0.45 p mm mrad Simon Jolly, Imperial College

  17. Cut Variation Conclusions • Variation in cut level produces clear change in emittances. • Currently using new cut level of 250 counts for emittance measurements. • More analysis needed into cut level as a function of image intensity. • Scintillator lifetime ~1 hour integrated beam time: more tests with Ce-Quartz needed. Simon Jolly, Imperial College

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