1 / 17

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.

hector-garza
Download Presentation

Pepperpot Emittance Calculations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related