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H - Ion Source Development

H - Ion Source Development. Dan Faircloth. ISIS Operational Ion Source. Penning H - ion source Surface Plasma Source (SPS) 35 mA through 0.6 10 mm aperture 200-250 s, 50 Hz  1% duty cycle  20 ml/min H 2  3 g/month Cs 0.17  mm mrad (665 keV, 35 mA, rms)

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H - Ion Source Development

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  1. H- Ion Source Development Dan Faircloth

  2. ISIS Operational Ion Source Penning H- ion source Surface Plasma Source (SPS) 35 mA through 0.610 mm aperture 200-250 s, 50 Hz  1% duty cycle  20 ml/min H2  3 g/month Cs • 0.17  mm mrad (665 keV, 35 mA, rms) 20-30 day average lifetime

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

  4. 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 53.7mm Post Extraction Acceleration Gap

  5. Increase Pulse Length Increase Output Current Reduce Emittance Maximise Lifetime Development Goals 200µs to 1.5ms 35mA to 70mA

  6. Steady State Solution 600 520 440 360 280 200 Cathode Surface ΔT= 73 ºC Computational Fluid Dynamic Cooling Calculation ΔT= 39 ºC Anode Surface Transient Solution 1000μs duty Thermal Modelling 3D Finite Element Model of the Ion Source using ALGOR.

  7. Maximum Discharge Length Obtained1.8ms @ 50Hz

  8. 3D Finite Element Model of the Ion Source using MAFIA. Terminated Pierce Extract Existing Extract Potential in Extract Region 17 keV normalised Hrms= 0.04  mm mrad Vrms= 0.16  mm mrad 17 keV normalised Hrms= 0.03  mm mrad Vrms= 0.03  mm mrad Magnetic Field in Coldbox Correctly Terminated Analysing Field 0T 0.5T Electromagnetic Modelling

  9. Ion Source Assembly Pole tip extensions on the 90° Analysing Magnet Penning Field B Magnet Assembly ISDR Infrastructure Changes Top Loading Ion Source Separate Penning Field

  10. Penning Field B ISDR Infrastructure Changes Top Loading Ion Source Separate Penning Field Ion Source Assembly Magnet Assembly

  11. Collaboration with IHEP, CAS Dr. Ouyang and Prof. Zhang Feb 2007: Dr. He Wei testing ion source components manufactured in China.

  12. 78 mA 500 µs 50 Hz

  13. Increase Pulse Length Increase Output Current Reduce Emittance Maximise Lifetime 200µs to 1.5ms 35mA to 70mA Development Goals

  14. Improved Diagnostics

  15. σ = 17.6 eV +/- 1.5 eV Transmission (%) δ(Transmission) / δ(−Vb) (%/V) Bias Voltage (V) Bias Voltage (V) Discharge Current (A) Transmission (%) Spectrum width σ (eV) Faraday Cup H- Beam I Potential Hill Discharge Current (A) Bias Voltage (V) Retarding Potential Energy Analyzer Work done in collaboration with Oxford University

  16. Current Work

  17. 100 x ‘(mRads) 50 0 -50 -100 -60 -30 0 30 -60 x (mm) 17 kV Extract Potential 62 mA Beam Current 100 50 y ‘(mRads) 0 -50 -100 -60 -30 0 30 -60 y (mm) 0.84 norm πmm mRad 0.92 norm πmm mRad

  18. 10 kV Extract Potential 32 mA Beam Current 100 100 50 50 x ‘(mRads) y ‘(mRads) 0 0 -50 -50 -100 -100 -60 -60 -30 0 30 -60 -30 0 30 -60 x (mm) y (mm) 0.48 norm πmm mRad 0.55 norm πmm mRad

  19. 6.5 kV Extract Potential 13 mA Beam Current 100 100 50 50 x ‘(mRads) 0 0 y ‘(mRads) -50 -50 -100 -100 -60 -60 -30 0 30 -60 -30 0 30 -60 y (mm) x (mm) 0.16 norm πmm mRad 0.32 norm πmm mRad

  20. Scintillator Measurements 5 kV Ext 5.5 kV Ext 6 kV Ext 6.5 kV Ext 7 kV Ext 8 kV Ext 9 kV Ext 11 kV Ext

  21. Ion Source Development Rig

  22. Pepper Pot Emittance Measurement • To help understand why the emittance is so large • To allow optimised design of the LEBT for the Front End Test Stand • To develop diagnostic experience for the FETS collaboration Mounting flange Details in the next talk Window Support rods Moving rod Scintillator and Pepperpot Camera

  23. Scanning Pepperpot and Scintillator studies Space charge studies with Krypton Different extraction geometries Different post acceleration gap Plasma meniscus modelling More detailed beam transport modelling Different materials for extended lifetime studies Future Work

  24. Questions?

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