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Crystal Collimation Results Overview | Recent Findings and Comparison with Simulations

Explore recent results from T-980 Collaboration on crystal collimation, including the experimental setup, initial findings from Multiple Volume Reflection (MVR), and comparisons with simulations. Analyze vertical multi-strip orientation discrepancies and goniometer installations. Evaluate beam displacement and angular scans. Investigate discrepancies between experimental and simulated data for beam collimation.

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Crystal Collimation Results Overview | Recent Findings and Comparison with Simulations

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  1. T-980 Crystal Collimation Recent ResultsT-980 Collaboration:FNAL, SLAC, BNL, CERN, PNPI, IHEP, INFN D. Still CM14 April 27, 2010

  2. Overview: • Brief T980 History and Purpose • Experimental Setup • Initial results from Multiple Volume Reflection (MVR) • Comparison of MVR results with simulations • Summary C14 April 27 , 2010 - D. Still

  3. 1 2 5 Ray Fliller- Halo 03 Explanation of Crystal Channeling C14 April 27 , 2010 - D. Still

  4. Vertical Multi-Strip Orientation This orientation is opposite of what was calculated and estimated. Name: MS-08-09 Bend: 63urad (VR) 8 strips C14 April 27 , 2010 - D. Still

  5. Overview: • Brief T980 History and Purpose • Experimental Setup • Initial results from Multiple Volume Reflection (MVR) • Comparison of MVR results with simulations • Summary C14 April 27 , 2010 - D. Still

  6. T980 Setup in Tevatron E0 for 2009-2010 F1 F172H Collimator 23.731 m Volume Reflected Beam (VR) Path B0 33.115 m 27.8 m E03H Collimator Channeled Beam Path Bent Crystal E0 D0 Detectors Abort gap (T:E1LABT) Bunch (T:E1LBNC) Pin detector (T:LE0PIN) Vertical F1 detectors Abort gap (T:F1LABT) Bunch (T:F1LBNC) C14 April 27 , 2010 - D. Still

  7. New Vertical Goniometer Up and Downstream Motion control and LVDT Up and Downstream Laser angle measurement instruments C14 April 27 , 2010 - D. Still

  8. New Characterized Crystals New New Name: MS-08-09 Bend: 63urad (VR) Name: O-05-09 Bend: 360urad Miscut: 120urad Installed Ver Dnstrm goniometer Installed Hor goniometer Name: O-BNL-02 Bend: 410urad Miscut: 1600 urad Installed Ver Upstrm goniometer C14 April 27 , 2010 - D. Still

  9. Goniometer Installations over Summer 09 Shutdown Newly built and installed (Summer 2009) Vertical goniometer at E0. It is ~ 4m upstream of the Hor. one. Ver. goniometer houses old O-shaped crystal (reversed for negative miscut) and multi-strip crystal. Modified horizontal goniometer. Replaced old large-miscut angle O-shaped crystal with new small miscut O-shaped during Summer 2009. C14 April 27 , 2010 - D. Still

  10. F1 F172v Collimator Channeled Beam (CH) Path E03v Collimator Volume Reflected Beam (VR) Path Bent Crystal E0 D0 Location of Vertical multi-strip CH & VR beam Displacement of CH beam at Collimator is +6.0 mm Displacement of VR beam at E03 Collimator is +1.76mm C14 April 27 , 2010 - D. Still

  11. Overview: • Brief T980 History and Purpose • Experimental Setup • Initial results from Multiple Volume Reflection (MVR) • Comparison of MVR results with simulations • Summary C14 April 27 , 2010 - D. Still

  12. MS-08-09 Characterizations at Cern North Area RD22 H8, 400 GeV/C protons Name: MS-08-09 Bend: 63urad (VR) Bend: 200urad (CH) 8 strips CH AM AM VR Crystal angle C14 April 27 , 2010 - D. Still

  13. Vertical Multi-strip Angular scan E03V and F172V Collimators in at max catch CH VR AM C14 April 27 , 2010 - D. Still

  14. VR beam collimated w/ E03V is consistent (only if F17 is in) 1.76mm displacement Corresponds to VR angle: θ=1.76mm/28m =63 urad Cern H8 measured angle: 93 urad/ sqrt(980/400)=59 urad Width is ~39 urad that’s wider than expected SPS: 18*sqrt(980/400) =29 urad . VR beam displaced 1.76mm from core with a sigma of 1.122. F172 collimator is in at max catch. (Analysis by Vladimir Shiltsev) C14 April 27 , 2010 - D. Still

  15. CH beam collimator scan w/ F172 collimator - (E03 is in) Angle of Bend for CH Corresponds to: θ=1.87mm/29m= 65 urad instead of 200 urad Width is ~28 urad that’s narrower? than expected C14 April 27 , 2010 - D. Still (Analysis by Vladimir Shiltsev) 1/5/2020 V.Shiltsev - T980

  16. MS Crystal Angle Scan: LE0PIN Loss rate Calculated Efficiency=90% If CCVAD calibration coefficient is 1.24 θ=(CCVAD-500) *1.24 Total width ~550 urad High Eff width ~100 urad C14 April 27 , 2010 - D. Still 1/5/2020 V.Shiltsev - T980 16

  17. Overview: • Brief T980 History and Purpose • Experimental Setup • Initial results from Multiple Volume Reflection (MVR) • Comparison of MVR results with simulations • Summary C14 April 27 , 2010 - D. Still

  18. Simulated Data – S. Drozhdin “Beam Collimation in the Tevatron Using Multi-strip Protvino Channeling Crystal” C14 April 27 , 2010 - D. Still

  19. Qualitative Look at Experimental vs. Simulated Data CH peak also aligns VR Beam collimated at E03V Align CH beam collimated at F172V Good Need better understanding of these areas. C14 April 27 , 2010 - D. Still

  20. Losses at Crystal are not consistent with Simulation C14 April 27 , 2010 - D. Still

  21. Experimental Data does not have loss at F0 Lambertson C14 April 27 , 2010 - D. Still

  22. What is missing from Real data to Simulation????? • Are there process that are not taken into account in simulation? Multi-turn effects, crystal problems, crystal inefficiencies, skewed planes, beam loss at additional apertures, physics missing from simulations????? • The problem seems to be most wrong in the AM part of crystal, then next boundaries between VR and CH. • Went back to Drozhdin paper to look in detail. Noticed that simulations are done for 20 turns. After talking with Sasha, once a particle is lost it is gone. Therefore number of particles is shrinking and it takes more (many more ) turns for a particle to be lost in the AM part.Therefore, we are not really estimating real data to simulation in area not in CH or VR. • Sasha reran simulation to take AM with circulation beam. C14 April 27 , 2010 - D. Still

  23. Modified original simulations to include estimate for multi-turn losses at amorphous angles C14 April 27 , 2010 - D. Still

  24. Experimental and simulated losses at the crystal C14 April 27 , 2010 - D. Still

  25. Experimental and simulated losses downstream E03 collimator C14 April 27 , 2010 - D. Still

  26. Experimental and simulated losses downstream of F172 collimator C14 April 27 , 2010 - D. Still

  27. Summary • Demonstrated CH and VR with the vertical multi-strip crystal MS-08-09 at 980Gev. • Collimator scans measure the VR angle at E03V at ~ 63urad in good agreement with estimated crystal VR bend but some error from 59urad characterized at Cern H8. • Collimator scans measure the CH angle at F172Vat ~ 65urad instead of H8 results of 200urad. Uncertain the cause of this error. In both VR and CH scans, both E03 and F172 need to be in to produce reasonable results. • Qualitative comparison of experimental data and simulated data has better agreement when better multi-turn beam loss estimates for crystal angles in the amorphous angles were applied. Further simulations will be run with increased number of turns. C14 April 27 , 2010 - D. Still

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