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Understanding Extraction And Beam Transport In The ISIS H - Ion Source

Understanding Extraction And Beam Transport In The ISIS H - Ion Source. D. C. Faircloth, A.P Letchford, C. Gabor, S. Lawrie M. O. Whitehead and T. Wood ISIS J. Pozimski, S. Jolly, P. Savage and M. Woods Imperial College.

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Understanding Extraction And Beam Transport In The ISIS H - Ion Source

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  1. Understanding Extraction And Beam Transport In The ISIS H- Ion Source D. C. Faircloth, A.P Letchford, C. Gabor, S. Lawrie M. O. Whitehead and T. Wood ISIS J. Pozimski, S. Jolly, P. Savage and M. Woods Imperial College

  2. The Front End Test Stand (FETS) project at ISIS requires a 70 mA 2 ms 50 Hz H- beam. Previous work has already demonstrated that these beam currents and duty cycles are possible. However the emittance of the ISIS ion source is very large. This presentation describes the steps being taken to reduce the emittance. Motivation

  3. ISIS Operational Ion Source • Penning H- ion source • Surface Plasma Source (SPS) • 45 mA through 0.610 mm aperture • (750 mA/cm2) • 200-250 s, 50 Hz  1% d.f. •  20 ml/min H2 •  3 g/month Cs 20-30 day average lifetime 10mm

  4. H- Ion Beam Extract Electrode Aperture Plate Penning Pole Pieces Discharge Region Ceramic Hollow Anode Source Body Copper Spacer Cathode Mica 10mm Mounting Flange

  5. Platform DC Power Supply Platform Ground 35kV Pulsed Extract Power Supply 17kV - + Laboratory Ground 18kV Extraction Electrode, Coldbox and Analysing Magnet all Pulsed - + 35keV H- Beam Post Extraction Acceleration Gap

  6. 860 mm Diagnostics Vessel 2000 Ls-1 Turbo pump 2000 Ls-1 Turbo pump

  7. Buffer Gas Delivery System X and Y Slit-Slit Emittance Scanners Beam Current Toriod Retarding Potential Energy Analyzer Diagnostics Vessel Diagnostic Dipole ISDR Diagnostics

  8. Buffer Gas Delivery System X and Y Slit-Slit Emittance Scanners Beam Current Toriod Diagnostics Vessel Diagnostic Dipole Beam Shutter ISDR Diagnostics Movable Scintillator with Interchangeable Pepperpot or Profile Head

  9. Ion Source 25 kV extract power supply Control Racks and Power Supplies 35 kV Insulator 17 kV extract power supply Cold Box Refrigerator ISDR Chiller Circulator

  10. Y-Emittance Scanner Mark X-Emittance Scanner Pepperpot and Profile Measurement Trev Diagnostics Vessel

  11. 100 x ‘(mRads) 50 0 -50 -100 -60 -30 0 30 -60 x (mm) The Present Situation 17 kV Extract Potential 57 mA Beam Current 100 50 y ‘(mRads) 0 -50 -100 -60 -30 0 30 -60 y (mm) 0.84 πmm-mRad norm rms 0.92 πmm-mRad norm rms

  12. Profile Measurements for Different Extraction Voltages

  13. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 17 kV Extraction Voltage 35 kV Platform Voltage 18 kV Post Acceleration Voltage 47 mA Beam Current

  14. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 16 kV Extraction Voltage 35 kV Platform Voltage 19 kV Post Acceleration Voltage 42 mA Beam Current

  15. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 15 kV Extraction Voltage 35 kV Platform Voltage 20 kV Post Acceleration Voltage 40 mA Beam Current

  16. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 14 kV Extraction Voltage 35 kV Platform Voltage 21 kV Post Acceleration Voltage 38 mA Beam Current

  17. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 13 kV Extraction Voltage 35 kV Platform Voltage 22 kV Post Acceleration Voltage 35 mA Beam Current

  18. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 12 kV Extraction Voltage 35 kV Platform Voltage 23 kV Post Acceleration Voltage 32 mA Beam Current

  19. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 11 kV Extraction Voltage 35 kV Platform Voltage 24 kV Post Acceleration Voltage 28 mA Beam Current

  20. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 35 kV Platform Voltage 25 kV Post Acceleration Voltage 25 mA Beam Current

  21. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 9 kV Extraction Voltage 35 kV Platform Voltage 26 kV Post Acceleration Voltage 21 mA Beam Current

  22. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 8 kV Extraction Voltage 35 kV Platform Voltage 27 kV Post Acceleration Voltage 17 mA Beam Current

  23. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 7 kV Extraction Voltage 35 kV Platform Voltage 28 kV Post Acceleration Voltage 13 mA Beam Current

  24. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 6.5 kV Extraction Voltage 35 kV Platform Voltage 28.5 kV Post Acceleration Voltage 12 mA Beam Current

  25. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 6 kV Extraction Voltage 35 kV Platform Voltage 29 kV Post Acceleration Voltage 10 mA Beam Current

  26. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 5.5 kV Extraction Voltage 35 kV Platform Voltage 28.5 kV Post Acceleration Voltage 9 mA Beam Current

  27. At normal operating conditions (17 kV Extraction Voltage) the beam is collimated into a round beam by the post acceleration electrodes. The beam is asymmetrically focused in the horizontal plane.

  28. Profile Measurements for Different Extraction Voltages Keeping Post Acceleration Voltage Constant at 18 kV

  29. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 17 kV Extraction Voltage 35 kV Platform Voltage 18 kV Post Acceleration Voltage 44 mA Beam Current

  30. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 16 kV Extraction Voltage 34 kV Platform Voltage 18 kV Post Acceleration Voltage 43 mA Beam Current

  31. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 15 kV Extraction Voltage 33 kV Platform Voltage 18 kV Post Acceleration Voltage 41 mA Beam Current

  32. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 14 kV Extraction Voltage 32 kV Platform Voltage 18 kV Post Acceleration Voltage 37 mA Beam Current

  33. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 13 kV Extraction Voltage 31 kV Platform Voltage 18 kV Post Acceleration Voltage 34 mA Beam Current

  34. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 12 kV Extraction Voltage 30 kV Platform Voltage 18 kV Post Acceleration Voltage 31 mA Beam Current

  35. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 11 kV Extraction Voltage 29 kV Platform Voltage 18 kV Post Acceleration Voltage 28 mA Beam Current

  36. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 28 kV Platform Voltage 18 kV Post Acceleration Voltage 25 mA Beam Current

  37. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 9 kV Extraction Voltage 27 kV Platform Voltage 18 kV Post Acceleration Voltage 21 mA Beam Current

  38. Profile Measurements For Different Post Acceleration VoltagesKeeping Extraction Voltage Constant

  39. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 35 kV Platform Voltage 25 kV Post Acceleration Voltage 25.2 mA Beam Current

  40. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 33 kV Platform Voltage 23 kV Post Acceleration Voltage 24.8 mA Beam Current

  41. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 31 kV Platform Voltage 21 kV Post Acceleration Voltage 24.6 mA Beam Current

  42. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 29 kV Platform Voltage 19 kV Post Acceleration Voltage 24.2 mA Beam Current

  43. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 27 kV Platform Voltage 17 kV Post Acceleration Voltage 23.8 mA Beam Current

  44. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 25 kV Platform Voltage 15 kV Post Acceleration Voltage 23.2 mA Beam Current

  45. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 23 kV Platform Voltage 13 kV Post Acceleration Voltage 22.8 mA Beam Current

  46. mA/cm2 2.5 2.0 1.5 1.0 0.5 0.0 10 kV Extraction Voltage 21 kV Platform Voltage 11 kV Post Acceleration Voltage 22.6 mA Beam Current

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