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Tevatron Halo Removal Dean Still 5/22/00

Tevatron Halo Removal Dean Still 5/22/00. Quick Collimator System Overview. Some Observations and Study Results Related to Large Proton Backgrounds at CDF and D0. Collimator System Upgrades for CRII. Wanted to move to commercial hardware to replace in house motion controls.

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Tevatron Halo Removal Dean Still 5/22/00

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  1. Tevatron Halo RemovalDean Still 5/22/00 • Quick Collimator System Overview. • Some Observations and Study Results Related to Large Proton Backgrounds at CDF and D0.

  2. Collimator System Upgrades for CRII • Wanted to move to commercial hardware to replace in house motion controls. • Collimators are faster and more reliable. • Each Collimator would be able to do feedback processing. • Wanted to move to a more automated system to reduce shot setup time and integrate with the Collider Sequencer. • Goal was to shot setup Halo Removal times of about 5 min. • Wanted to move to a 2 stage collimator Halo removal system. • Build 4 new targets and 8 new secondary collimators . • Wanted to employ a Proton removal system. • Build 1 new proton removal collimator and E0 dogleg system. • Goal was to remove 1E13 in 100 secs.

  3. Tevatron Collimator Layout

  4. Collimator Groups Proton Set 1 Proton Set 2 D49 target D171 target E03 collimatorD173 collimator F172 collimator A0 collimator Pbar Set 1Pbar set 2 F49 target F173 target F48 collimator F171 collimator D172 collimator E02 collimator Green = Currently operational

  5. Lattice Parameters for Collimator Locations for Collider II

  6. Collimator Controls Hardware

  7. Collider II 1.5m Collimator

  8. Collider II 1.5m Collimator

  9. Overview of New Software N*s X0 Xi Application Front End OAC Fast Processing : Loss Monitor & Intensity Feedback. Global Orchestration: Employs states and collimator moving map. Configure/view, Initiate Process: Can use sequencer initiate scraping.

  10. Collimator Controls Block Diagram

  11. Collimator Moving Order for Halo Removal

  12. Tunnel Layout of Collimator Local Loss Monitors Local Loss Monitors used for proton losses Local Loss Monitors used for pbar losses F17 Kicker F172 Collimator F173 Target F17 Spool F171 Collimator F17 Dipole Protons

  13. Example of D49 movement during Halo Removal Process Find the edge of the beam Fine Scrape process: Scrapes .4% of proton beam Before Halo removal CDF proton loss Initial Move No feedback After Halo Removal CDF proton loss

  14. Proton & Pbar Targets moving during Halo Removal .

  15. 2nd Collimator loss Plot during Halo Removal .

  16. Cold Magnet loss Plot during Halo Removal .

  17. Summary of Halo Losses During Stores • D0 proton Halo losses are not effected by scraping. • CDF and D0 report high proton rates in pots in bay. • CDF reports large losses in muon chambers due to proton halo. • CDF proton halo losses develop “spikes” due to “DC” beam. • Losses that are attributed to power supply failures at CDF.

  18. Studies Conducted to Understand Problems

  19. F172 Vertical Retraction Scan(with D49 target in)

  20. F172 Horizontal Retraction Scan (with D49 target in)

  21. E03 Vertical Retraction Scan (with D49 target in)

  22. E03 Horizontal Retraction Scan (with D49 target in)

  23. Merit of Halo Removal Effiency for Beginning of Store CDF and D0 Halo losses before scraping. CDF and D0 Halo Losses after scraping

  24. Collimator Shielding Effiency for losses at End of Store All Collimators Retracted at this point

  25. End of Store Collimator Effiency

  26. Studies Conducted to Understand Problems

  27. Studies Conducted to Understand Problems

  28. Studies Conducted to Understand Problems

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