H Ion Source Development Dan Faircloth ISIS Operational
- Slides: 24
H- Ion Source Development Dan Faircloth
ISIS Operational Ion Source Penning H- ion source Surface Plasma Source (SPS) 35 m. A 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 ke. V, 35 m. A, rms) 20 -30 day average lifetime
H- Ion Beam Penning Pole Pieces Aperture Plate Anode Source Body Cathode Extract Electrode Discharge Region Ceramic Copper Spacer Mica Mounting Flange 10 mm
Platform DC Power Supply Platform Ground Pulsed 17 k. V Extract Power Supply Extraction Electrode, Coldbox and Analysing Magnet all Pulsed 35 k. V + Laboratory Ground 18 k. V - + 53. 7 mm Post Extraction Acceleration Gap 35 ke. V H- Beam
Development Goals • • Increase Pulse Length 200µs to 1. 5 ms Increase Output Current 35 m. A to 70 m. A Reduce Emittance Maximise Lifetime
Thermal Modelling 3 D Finite Element Model of the Ion Source using ALGOR. Steady State Solution 600 520 440 360 280 200 Computational Fluid Dynamic Cooling Calculation Transient Solution Cathode Surface Anode Surface 1000μs duty ΔT= 73 ºC ΔT= 39 ºC
Maximum Discharge Length Obtained 1. 8 ms @ 50 Hz
Electromagnetic Modelling 3 D Finite Element Model of the Ion Source using MAFIA. Existing Extract Terminated Pierce Extract Potential in Extract Region Magnetic Field in Coldbox 17 ke. V normalised Hrms= 0. 04 mm mrad Vrms= 0. 16 mm mrad Correctly Terminated Analysing Field 0 T 0. 5 T 17 ke. V normalised Hrms= 0. 03 mm mrad Vrms= 0. 03 mm mrad
ISDR Infrastructure Changes Top Loading Ion Source Separate Penning Field 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 Ion Source Assembly Penning Field B Magnet Assembly
Collaboration with IHEP, CAS Dr. Ouyang and Prof. Zhang Feb 2007: Dr. He Wei testing ion source components manufactured in China.
78 m. A 500 µs 50 Hz
Development Goals • • Increase Pulse Length 200µs to 1. 5 ms Increase Output Current 35 m. A to 70 m. A Reduce Emittance Maximise Lifetime
Improved Diagnostics
Transmission (%) δ(Transmission) / δ(−Vb) (%/V) Retarding Potential Energy Analyzer Bias Voltage (V) H- Faraday Cup Beam Potential Hill Transmission (%) Discharge Current (A) Spectrum width σ (e. V) Bias Voltage (V) σ = 17. 6 e. V +/- 1. 5 e. V I Bias Voltage (V) Work done in collaboration with Oxford University Discharge Current (A)
Current Work
17 k. V Extract Potential 62 m. A Beam Current 100 10 0 50 y ‘(m. Rads) x ‘(m. Rads) 50 0 -50 -100 -60 -30 0 x (mm) 30 0. 84 norm πmm m. Rad -60 10 -60 0 -30 0 y (mm) 30 0. 92 norm πmm m. Rad -60
10 k. V Extract Potential 32 m. A Beam Current 50 50 y ‘(m. Rads) 100 x ‘(m. Rads) 100 0 -50 100 -60 0 -50 -30 0 x (mm) 30 0. 48 norm πmm m. Rad -60 100 -60 -30 0 y (mm) 30 0. 55 norm πmm m. Rad -60
6. 5 k. V Extract Potential 100 50 50 y ‘(m. Rads) x ‘(m. Rads) 13 m. A Beam Current 0 0 -50 100 -60 -30 0 x (mm) 30 0. 16 norm πmm m. Rad -60 100 -60 -30 0 y (mm) 30 0. 32 norm πmm m. Rad -60
Scintillator Measurements 5 k. V Ext 5. 5 k. V Ext 6. 5 k. V Ext 7 k. V Ext 8 k. V Ext 9 k. V Ext 11 k. V Ext
Ion Source Development Rig
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 Details in the next talk Mounting flange Window Support rods Moving rod Camera Scintillator and Pepperpot
Future Work • • 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
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