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The ISIS Hˉ Ion Source Status & Plans

The ISIS Hˉ Ion Source Status & Plans. Dan Faircloth. The ISIS 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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The ISIS Hˉ Ion Source Status & Plans

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  1. The ISIS Hˉ Ion Source Status & Plans Dan Faircloth

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

  4. H2 Gas Pulse ~200μs 50A Discharge Pulse ~600μs 17kV Extract Pulse ~250μs 35mA H- Beam Mode of Operation Time

  5. Research and Development Program Goals for ISIS upgrades and future accelerators: • Double output current 35mA → 70mA • Increase pulse length 200μs → 1 or 2 ms • Improve emittance • Maximise lifetime

  6. Top Loading Ion Source Ion Source Assembly Flange and Magnet Assembly

  7. Increase aperture width to 0.8mm 70mA beam current

  8. Thermal Modelling 17 keV normalised Hrms= 0.03  mm mrad Vrms= 0.16  mm mrad 600 520 440 360 280 200 0T 0.5T Electromagnetic Modelling

  9. Research and Development Program Goals for ISIS upgrades and future accelerators: • Double output current 35mA → 70mA • Increase pulse length 200μs → 1 or 2 ms • Improve emittance • Maximise lifetime

  10. Next Steps • Development program delayed by problems with the extract voltage power supply. • The power supply has now been repaired and modified by the manufactures and is awaiting reinstallation on the high voltage platform. • This will allow extraction at higher voltages and longer pulse lengths.

  11. Experiments on the ISDR • Pepper Pot emittance measurements • Energy analyser • 25kV extract voltage • Lifetime studies with long pulse length

  12. SOURCE PART COST (£) BODY 800 ANODE 200 CATHODE 200 BUCKET 500 FLANGE 500 VEECO VALVE 300 EXTRACTOR ELECTRODE + CARRIER 200 THERMOCOUPLES 60 APERATURE PLATE 50 CERAMIC PILLARS AND SHEILDS 150 TRANSPORT TUBE ASSEMBLY 200 MICA 10 NUTS BOLTS WASHERS ETC 20 TOTAL 3190 For operation at least 4 complete sources are required. TOTAL £12,760 MAGNET FLANGE PART COST (£) MAGNET FLANGE 5000 BENDING MAGNET 1000 COLD BOX 1500 FEED THROUGHS 1000 CERAMIC INSULATOR 1000 CEASIUM SHEILD 300 PRESSURE GAUGES 600 TOTAL £10,400 ANCILLIARY EQUIPMENT PART COST (£) EXTRACT POWER SUPPLY 20000 AC ARC POWER SUPPLY 6000 DC ARC POWER SUPPLY 4000 MAGNET POWER SUPPLY 1500 CHILLER/CIRCULATOR 1500 TEMPERATURE CRATE 3000 GAS CONTROLLER 2000 ISOLATING TRANSFORMER 4000 VACCUUM PUMPS 2000 HV PLATFORM POWER SUPPLY 5000 FRIDGE 1000 ASSOCIATED PIPEWORK 500 TOTAL £50,500 HV PLATFORM PART COST (£) PLATFORMS 2000 HV CAGE 1000 CABLING 1000 LIFTING GEAR 2000 TOTAL £6,000 GRAND TOTAL £79,660 Ion Source FETS Cost

  13. Ion Source FETS Development Plan 2005 2006 2007 2008 2009 Purchase power supplies Prepare R8 Manufacture vacuum vessels Manufacture 4 additional top loading ion sources Design and build HV platform and cage Ancillary wiring Assemble ion source Commission ion source Characterise ion source

  14. Acknowledgements Mark Whitehead Trevor Wood John Thomason Reg Sidlow Work funded by European Union HPNIS Network Contract No. HPRI-CT-2001-50021

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