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T980 and UA9 Crystal Collimation

Learn about the T-980 layout, new crystal technology, beam dynamics, and special Tevatron runs in advancing crystal collimation for particle accelerators.

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T980 and UA9 Crystal Collimation

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  1. US LARP Fermilab Accelerator Physics Center T980 and UA9 Crystal Collimation DOE LARP Review Fermilab June 1, 2011 Nikolai Mokhov

  2. OUTLINE • Crystal Collimation for LHC • T-980 Layout Crystals, Data Analysis • Pixel Detectors • T-980 Special Run May 16-26 • UA9 Status and Plans Crystal Collimation - N.V. Mokhov

  3. Crystal Collimation for LHC Drive beam halo deeper into a secondary collimator (coherently) Reduced secondary and tertiary halo Reduced beam losses at critical locations: detectors at IRs and superconducting magnets downstream Two prove-of-principal experiments supported by LARP: T-980 (Tevatron) and UA9 (SPS) Crystal Collimation - N.V. Mokhov

  4. T-980 Mission • Develop a collimation system for hadron colliders based on bent crystal techniques, which has a promise to reduce machine impedance, beam losses in superconducting magnets, improve background conditions in the collider detectors and be compatible with heavy-ion operation. • Start routine use of crystal collimation in the entire Tevatron collider store. • Study the system’s performance and underlying beam dynamics exploiting the unique possibility provided by the Tevatron collider to evaluate an engineering implementation of this technique in the LHC. Crystal Collimation - N.V. Mokhov

  5. Current 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 Crystal Collimation - N.V. 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 Crystal Collimation - N.V. Mokhov

  7. Ferrara Crystal MS-16F2 (2) • E. Bagli • V. Guidi • Mazzolari • (2011) Predictions for Tevatron:a = 72.3 mrad, e = 94.8% Crystal Collimation - N.V. Mokhov

  8. MS-08-09 Angle Scan: Excellent Performance March 2010 May 2011 Crystal Collimation - N.V. Mokhov

  9. Good Performance and Issues with O-shaped Bending angle declared to be 360 mrad. In reality it is always less. ~ 230 mrad Explanation Measured displacement = 5.5 mm (220 mrad) instead of expected 8.5 mm (360 mrad) Crystal Collimation - N.V. Mokhov

  10. ORIGIN-based Data Analysis CH peak exact position CH acceptance CH efficiency!!! Same for VR Losses (Hz) Losses (Hz) Crystal orientation (urad) CH peak position CH acceptance VR acceptance Collimator position (mm) ViktoriyaZvoda Crystal Collimation - N.V. Mokhov

  11. Results for T-980 Crystals Crystal Collimation - N.V. Mokhov

  12. Pixel Telescope • Tracking deflected particles • Currently installed in front of E03 collimator • Has 3 telescoping planes (V and H), • currently some problem with two • Supported by Ethernet Networking • Multi-chip modules are of CMS forward pixel production • 1x2 cm2 with a sensitive area 0.8x1.6 cm2. • Pixel size 100x150 mm2, resolution 7-8 mm. Crystal Collimation - N.V. Mokhov

  13. Special Tevatron Run May 16-26 • Four 6-hour dedicated End-of-Store (EOS) T-980 periods, with a great help from visitors from CERN and INFN. • Studied three crystals and pixel detector: a lot of interesting data to analyze! • Issues with MS-16 because of its length and motion of goniometer. Possible to have a work around and would like to try again. • Issues with several pixel detector planes to be fixed. • 2-plane studies are incomplete, would like to try again. Crystal Collimation - N.V. Mokhov

  14. First Image on Pixel Detector Wednesday, May 25, 2011 Pixel detector to assist beam collimation experiments For the first time, on Wednesday, May 18, physicists operated a tiny detector in the Tevatron that will help develop a technology to improve the quality of collision data. ….. Members of the crystal collimation study, a joint program of Fermilab's Accelerator Division, the Accelerator Physics Center, and the LARP program, celebrated their success with the pixel detector at the Tevatron in the Main Control Room on Wednesday, May 18 (lower left). Crystal Collimation - N.V. Mokhov

  15. Channeled beam from O-05-09 crystal as angle is changed from AM to CH to VR Crystal Collimation - N.V. Mokhov

  16. Good Tool for Analyzing Channeled Beam Crystal Collimation - N.V. Mokhov

  17. T-980 Summary • T-980 gained good experience in testing various bent crystal types. Estimated channeling efficiency of O-shaped crystals is 65-75%, volume reflection efficiency of 8-strip crystal is 70%. Small opening in quasi-mosaic crystal holder made it difficult to work with in the collider. T-980 favors multi-strip (large angular acceptance, MVR gives large deflection) and O-shaped crystals. Both - easy to work with. • Enhanced instrumentation from scintillating paddles to pixel telescope is able to provide comprehensive info. • Successful studies at Tevatron May 16-26: dedicated long periods of EOS. More EOS will be requested before the end of the Tevatron Run II. Crystal Collimation - N.V. Mokhov

  18. Layout of UA9 at SPS Crystal Collimation - N.V. Mokhov

  19. UA9-SPS Main Results ValentinaPrevitali Crystal Collimation - N.V. Mokhov

  20. UA9: Changes in Layout Crystal Collimation - N.V. Mokhov

  21. UA9 Study Plans ValentinaPrevitali Crystal Collimation - N.V. Mokhov

  22. UA9: Toward the LHC Crystal Collimation - N.V. Mokhov

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