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CNGS Secondary Beam Monitors: Design and Performance

CNGS Secondary Beam Monitors: Design and Performance. Design Commissioning Performance. Secondary Beam Design and Layout. 2.7m. 43.4m. 100m. 1095m. 18m. 5m. 67m. 5m. CNGS Secondary Beam Layout. TBID/2IonCh. Cross-hair/2IonCh. Muon Detectors. IonCh: Ionization Chamber.

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CNGS Secondary Beam Monitors: Design and Performance

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  1. CNGS Secondary Beam Monitors: Design and Performance • Design • Commissioning • Performance E. Gschwendtner, CERN

  2. E. Gschwendtner, CERN

  3. Secondary Beam Design and Layout E. Gschwendtner, CERN

  4. 2.7m 43.4m 100m 1095m 18m 5m 67m 5m CNGS Secondary Beam Layout TBID/2IonCh Cross-hair/2IonCh Muon Detectors IonCh: Ionization Chamber TBID: Target Beam Instrumentation Downstream E. Gschwendtner, CERN

  5. Target  see Luca’s talk Target magazine installation inside target station (25 Nov. 2005) E. Gschwendtner, CERN

  6. Horn see Stephane’s and Ans’ talk Installation of the horn in the target chamber E. Gschwendtner, CERN

  7. Helium Tubes E. Gschwendtner, CERN

  8. Decay Tube • steel pipe • 1mbar • 994m long • 2.45m diameter • entrance window: 3mm Ti • exit window: 50mm carbon steel, water cooled April 2004: vacuum tests ok E. Gschwendtner, CERN

  9. Shutter Decay tube is closed with →3mm Titanium window Mustbe protected by a ‘shutter’ when access → Hardware Interlocked!!! E. Gschwendtner, CERN

  10. Hadron Stop graphite cooling modules • Cooling modules: stainless steel tubes in Al blocks • Several temperature sensors (both in target chamber and in hadron stop) Hadron Stop finished Sept. 2003 E. Gschwendtner, CERN

  11. Secondary Beam Instrumentation E. Gschwendtner, CERN

  12. TBID 2 IonCh L/R TBID + 2 Ionization Chambers Purpose: • Check efficiency with which protons are converted into secondaries • Multiplicity (Compare with BFCT upstream of the target) • Misalignment of the Beam 2. Sec. Beam Instrumentation E. Gschwendtner, CERN

  13. TBID (Target Beam Instrumentation Downstream) TBID Monitor ● Secondary emission monitor ● 12 µm Ti foils ● better than 10-4 mbar vacuum 2. Sec. Beam Instrumentation E. Gschwendtner, CERN

  14. TBID Getter-pump Ion-pump TBID E. Gschwendtner, CERN

  15. Ionization Chambers Ionization Chambers in Target Chamber TBID Monitor might not survive if high intensity beam misses the target Ionization Chambers as back-up • SPS type BLM • N2 filled ionization chamber • Radius = 4.75 cm • Gap-width = 0.55 cm • 30 gaps • Bias: 800V-1500V E. Gschwendtner, CERN

  16. beam Cross-hair beam view (schematic) Monitors Cross-Hair • Layout: • 4mm wide • appendix 10mm long • 20mm thick along the beam-axis • Beam 10mm off X-hair Cross-Hair observed by 2 IonCh L/R E. Gschwendtner, CERN

  17. Muon Monitors • Monitoring of: • muon intensity • muon beam profile shape • muon beam profile centre • Muon intensity: • Up to 7.7x107 per cm2 and 10.5µs • Dynamic range: 105 • Accuracies: • absolute 10 % • relative 3 % • reproducibility: cycle to cycle 1%, one year 5% E. Gschwendtner, CERN

  18. Muon Monitor Layout LHC type BLMs (Beam Loss Monitors for LHC) • Parallel electrodes separated by 0.5 cm • Stainless steel cylinder • Al electrodes • N2 gas filling at 100 mbar over pressure • Diameter=8.9cm, length=60cm, 1.5 litre 60cm • 37 fixed monitors (Ionization Chambers) • 1 movable chamber behind fixed monitors for relative calibration • Movement by stepping motors E. Gschwendtner, CERN

  19. 270cm 11.25cm E. Gschwendtner, CERN

  20. Secondary Beam Commissioning E. Gschwendtner, CERN

  21. Ionization Chambers TBID beam collimator target horn Target Region Layout BPM2 E. Gschwendtner, CERN

  22. Reading from TBID and collimator’s ionization chambers vs. BPM2 BPM2 collimator p Horizontal Beam Scan, Target Out BPM2 E. Gschwendtner, CERN

  23. Reading from TBID and collimator’s ionization chambers vs. BPM2 BPM2 collimator p Vertical Beam Scan, Target Out BPM2 E. Gschwendtner, CERN

  24. Intensity on TBID vs. BPM2 position Target BPM2 p Horizontal Beam Scan, Target IN BPM2 E. Gschwendtner, CERN

  25. Target vs. Horn Alignment A.E. Ball et al. SL-2001-016-EA Pit 2 Pit 1 target vs. horn misalignment: 3 mm  10.1 cm shift in Muon Pit1 6 mm  19.1 cm 9 mm  24.3 cm E. Gschwendtner, CERN

  26. Target vs. Horn Alignment Muon pit 1: more sensitive to target vs. horn alignment 270cm BPM2 Target Horn p BPM2 Horn Target p E. Gschwendtner, CERN

  27. Vertical Beam vs. Target Alignment Muon pit 2: more sensitive to beam vs. target alignment E. Gschwendtner, CERN

  28. coll.  =14 mm BPM2 target horn H L 1.9 mm R coll.  =14 mm BPM2 target horn V U 1.4 mm 2 mm D Final Alignment target ref. system beam ref. system beam ref. system target ref. system E. Gschwendtner, CERN

  29. Horizontal Angular Scan, Target Out E. Gschwendtner, CERN

  30. Horizontal Angular Scan, Target Out E. Gschwendtner, CERN

  31. Horn/Reflector Timing Tests horn pulse 50ms beam reflector pulse 50ms beam E. Gschwendtner, CERN

  32. Horn/Reflector Timing Tests E. Gschwendtner, CERN

  33. Comparison Nominal-Negative Polarity I E. Gschwendtner, CERN

  34. Comparison Nominal-Negative Polarity II E. Gschwendtner, CERN

  35. Comparison Nominal-Negative Polarity III E. Gschwendtner, CERN

  36. Target Unit Tests unit 1 : polycrystalline graphite by Carbone-Lorraine 2020 PT               density  1.76 g/cm3 unit 3:carbon-carbon composite by Carbone-Lorraine A035               density >1.75 g/cm3 E. Gschwendtner, CERN

  37. Comparison Unit 1 and Unit 3 Muon pit 1 Average of 2 extraction, ~1.2E13 protons Muon pit 2 E. Gschwendtner, CERN

  38. 3. Status Quality check – muon monitors (example: Pit 1 - horizontal plane) data <> Fluka PRELIMINARY more on Friday, 8 Sept. (Edda’s talk) E. Gschwendtner, CERN

  39. Comparison Meas.-Sim. I (Preliminary) Muon Monitors, Horizontal Pit 1 ■Measurement ■Simulation Fluka simulation; P. Sala et al E. Gschwendtner, CERN

  40. Comparison Meas.-Sim. II (Preliminary) Muon Monitors, Vertical Pit 1 ■Measurement ■Simulation Fluka simulation; P. Sala et al E. Gschwendtner, CERN

  41. Comparison Meas.-Sim. III (Preliminary) Muon Monitors, Horizontal Pit 2 ■Measurement ■Simulation Fluka simulation; P. Sala et al E. Gschwendtner, CERN

  42. Comparison Meas.-Sim. IV (Preliminary) Muon Monitors, Vertical Pit 2 ■Measurement ■Simulation Fluka simulation; P. Sala et al E. Gschwendtner, CERN

  43. Secondary Beam Instrumentation Performance during Operation E. Gschwendtner, CERN

  44. Muon Monitor Repeatability accuary < 1% ! E. Gschwendtner, CERN

  45. TBID Performance E. Gschwendtner, CERN

  46. Muon Monitor Linearity 4E12 1.7E13 1.1E13 1.4E13 E. Gschwendtner, CERN

  47. Summary • Detailed hardware commissioning • ‘Dry runs’ paid off! • Hardly any problems with the control system • Secondary beam line has been successfully commissioned  CNGS is operational Now operational work starts: • Performance studies, • Systematics, • etc……… E. Gschwendtner, CERN

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