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T980 Crystal Collimation

US LARP. Fermilab. Accelerator Physics Center. T980 Crystal Collimation. 1 st HiLumi LHC / LARP Collaboration Meeting CERN November 16-18, 2011. Nikolai Mokhov and Dean Still. OUTLINE. 2011 Layout and Crystals Pixel Detector Special Run May 16-27:

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T980 Crystal Collimation

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  1. US LARP Fermilab Accelerator Physics Center T980 Crystal Collimation 1st HiLumi LHC / LARP Collaboration Meeting CERN November 16-18, 2011 Nikolai Mokhov and Dean Still

  2. OUTLINE • 2011 Layout and Crystals • Pixel Detector • Special Run May 16-27: • O-shaped, MS-8 and MS-16 Crystal Studies • CH and VR Beam Imaging with Pixel T980 Crystal Collimation - N. Mokhov

  3. Previous Results for T-980 Crystals T980 Crystal Collimation - N. Mokhov

  4. Goals for 2011 In February, 2011 installed 2 new crystals in the vertical goniometer MS-8 and a MS-16. Also installed a 2 plane pixel upstream of the E03 collimator to image beam effected by crystals. T980 study period: Tevatron incorporated 2 weeks of studies which allowed ~ 40 hours of dedicated studies for T980. Studies were held May 15 – 27 and hosted 3 visitors. 2 from CERN and 1 from INFN. T980 study period plans: Commission horizontal and vertical pixel detector. Image horizontally channeled beam on the horizontal pixel detector. Image vertically multiple volume reflected (MVR) beam on the vertical pixel detector. Scan and Characterize a new Multi-strip (MS-16) crystal and look at efficiencies. Demonstrate 2 – plane crystal collimation using a vertical MS-8 using MVR and horizontally using channeling from an O-shaped crystal. T980 Crystal Collimation - N. Mokhov

  5. T-980 Layout at E0 • Goniometer moves and rotates a crystal to a precise (~2 mrad) angle • Crystal inserted at 5s • Collimators inserted at (6-7)s to intercept CH and VR particles • Loss monitoring system: PIN diode, BLM, Scintillating paddles • 2-plane pixel telescope to see CH and VR beam profiles on E03 T980 Crystal Collimation - N. Mokhov

  6. θVR θVR θVR New Ferrara Crystal MS-16F2 (1) Replaced damaged MS-16F1 in vertical goniometerin March 2011 • Total number of strips: 16 • Interferometric characterizations: 13 strips • are aligned within 80 μrad. • Length of each strip along the beam: 1 mm • Transversal thickness of each strip: 0.3 mm • Anticlastic curvature radius : 4.0 m • Max baking temperature: 100 °C • Miscut angle: 80 μrad • Crystal and holder do not require cleaning T980 Crystal Collimation - N. Mokhov

  7. Ferrara Crystal MS-16F2 (2) Predictions for Tevatron: a = 72.3 mrad, e = 94.8% T980 Crystal Collimation - N. Mokhov

  8. Two IHEP Crystals IHEP 8-strip MS-08-09, small miscut. Bend: 63mrad (VR), 200 mrad (CH). In vertical goniometer. Studied in 2010, good performance. Then, replaced with (damaged) MS-16F1. March 2011: re-installed instead of QM. IHEP O-shaped O-05-09 Bend: 360 mrad, Miscut: 120 mrad Inhorizontal goniometer T980 Crystal Collimation - N. Mokhov

  9. Pixel Telescope to Track CH & VR Particles • Installed in front of E03 collimator • 3 telescoping pixels per plane • Supported by Ethernet Networking Resolution 7-8 mm T980 Crystal Collimation - N. Mokhov

  10. E0 Pixel Detector T980 Crystal Collimation - N. Mokhov

  11. O-05-09 Characterization FWHM = 250 urad T980 Crystal Collimation - N. Mokhov

  12. E03H Collimator Scan with O-05-09 Displacement from core: -4.65mm T980 Crystal Collimation - N. Mokhov

  13. First Image of CH Beam from O-05-09 May 18, 2011 T980 collaborators from FNAL, CERN and INFN T980 Crystal Collimation - N. Mokhov

  14. Analysis of Pixel Data T980 Crystal Collimation - N. Mokhov 14

  15. E03 Collimator E0 Pixel Detector Circulating Beam Multiple Volume Reflected (MVR) Beam Multi-Strip Bent Crystal E0 MVR T980 Crystal Collimation - N. Mokhov

  16. MS-8 Strip results 2010 results 2011 results T980 Crystal Collimation - N. Mokhov

  17. T980 Crystal Collimation - N. Mokhov

  18. T980 Crystal Collimation - N. Mokhov

  19. Results from Attempt to Scan MS-16 T980 Crystal Collimation - N. Mokhov

  20. T980 Crystal Collimation - N. Mokhov

  21. SUMMARY O-shaped and 8-strip crystals worked well in the last studies at Tevatron. Estimated channeling efficiency of O-shaped crystals is 65-75%, volume reflection efficiency of 8-strip crystal is 70%. Horizontal pixel worked well, while vertical pixel had too many dead pixels to resolve MVR from MS-8. Results to characterize MS-16 are inconclusive because of time needed to diagnose that the length of crystal and motion of goniometer produce losses that are difficult to untangle. Results of the two-plane measurements are also inconclusive - setup time is extensive & comparison of loss signals are subtle - more time is needed to further study. T980 Crystal Collimation - N. Mokhov 21

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